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Showing results for tags 'gearbox'.
Found 167 results
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[MOC] Build Instructions for smoothly switching 2 speed automatic gearbox
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi for those interested I have put the build instructions for my "smoothly switching automatic 2 speed gearbox" on rebrickable: https://rebrickable.com/mocs/MOC-51030/TechnicBrickPower/smoothly-switching-2-speed-automatic-geabrbox/ Here's the video about it: -
8 Speed Gearbox using just two levers/selectors - for @SNIPE
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here I present an 8 speed gearbox that does the seemingly impossible - creating eight speeds using just two levers/selectors. Normally two selectors are used to create a 4 speed gearbox - however this design allows for 1 of 8 different speeds to be selected - thanks for the idea @SNIPE -
Efficient 4-speed gearbox
lmdesigner42 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi everyone. This is an efficient 4-speed gearbox design I came up with a while ago using the wave selector and new(ish) 20-tooth clutch gears. It is efficient since only 8 gears and 3 rotating shafts are required, which is near the minimum possible. The shafts in the image are as follows: Yellow - output Red - input Orange - shifter Black - extra, free-spinning All of the shafts go straight through the gearbox. The compact design is possible by meshing 16-tooth and 20-tooth clutch gears, which gives different ratios at each of the 4 clutch points. Unfortunately, the two shafts with driving rings need to be connected by another gear mesh (in this case 12:24) which results in out of order shifting with the wave selector. Gear 1 (1st) – 12:16 + 12:24 = 8/3 = 2.67:1 Gear 2 (3rd) – 12:20 = 5/3 = 1.67:1 Gear 3 (2nd) – 16:20 + 12:24 = 5/2 = 2.5:1 Gear 4 (4th) – 16:16 = 1:1 The shifting order issue could be corrected by using a mechanism shifting one driving ring back and forth and then the other, but that would take more space than the wave selector. The offset of one driving ring by one stud is handled by a sliding 16-tooth gear linking the lower driving ring with another 3 studs higher, putting it in the proper position to mesh with the wave selector. The extra free spinning shaft (black) is used to hold the third driving ring. The transmission fits into a small 9x7x6 box (not including the stepper) which can be easily connected to a chassis represented by the 5x7 frames. The below picture shows how small the core part of the gearbox is. In conclusion, the advantages of this gearbox include small size, few moving parts, and different ratios, while out-of-order shifting is a disadvantage. Comments and questions are welcome -
[MOC] Smooth transmission 2 speed automatic gearbox
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here I present a smoothly switching 2 speed automatic gearbox. The gearbox uses the "differential jam" phenomena to prevent reverse torque transmission during the gear switch over point, when the driving gearing can be momentarily disengaged. The gearbox automatically switches down by a ratio of 2/3 when the load on the output is sufficiently high by using a differential to detect the loading and to drive an orange rotary catch. This is a smooth transition due to the reverse path being only one directional. https://youtu.be/h7j50GRm6Vc -
[MOC] Compact 2 Speed Automatic Gearbox
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
This is a compact 2 speed automatic gearbox design. Instead of using a differential to react to torque on the output it uses the force on the gear teeth to push a liftarm to automatically change the gearing ratio to the 2nd speed once the torque threshold has been exceeded. The automatic gearbox will switch back down to the first speed once the torque on the output is reduced by using two rubber bands to pull back the liftarm. The first speed is simply a 1 to one ratio and the second speed is a 0.6 ratio. The design can be easily modified to change the the second gear speed to other ratios such as 0.36 or 0.2. -
[MOC] Build Instructions for automatically reversing gearbox
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi All, Have just published the build instructions for my recent automatically reversing gearbox on rebrickable: https://rebrickable.com/mocs/MOC-49276/TechnicBrickPower/auto-reversing-gearbox Here's the video about it: -
Automatically Reversing Gearbox
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi Everyone, This gearbox has been designed to automatically reverse if there is a high load on the output. The gearbox works by using a differential to react to the torque on the output and it drives a two state switch to select the reverse or forward direction in the gearbox. -
Ultra Compact 8+N+R Sequential Gearbox
Anto posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
This gearbox is an upgrade of my ultra compact 8-speed sequential gearbox. The 8-speed gearbox was nice but it was frustrating to know that the 2-speed gearbox took as much space as the 4-speed gearbox. I thought about transforming the 2-speed gearbox into a 2+N+R one. I had an idea about how to transform this gearbox but I didn't really think about how to activate the reverse and the neutral. Maybe by doing something with the knobs... I spoke with @Charbel and he gave me the idea to use the Bionicle parts I already used on my previous gearbox. Then I ended up with this: I used large frames as in the Lamborghini Sian. They make the whole gearbox stiff and now you have just to build a chassis arount the 'box! The neutral was extremely simple to do. See by yourselves: The reverse was more complex to create. For every foreward speed, the 2+N+R-speed gearbox rotates the 4-speed gearbox by the red 16t at the bottom. The reverse doesn't use the 4-speed gearbox, it uses the blue 20t at the top of the picture below: To engage the neutral and the reverse, I fixed two Bionible parts on the left knob. So they act as a smaller knob, with two teeth, and at a point 1/4 turn of the right knob makes the left knob rotate by 1/4 turn, whereas for all the foreward speeds, the left knob does 1/4 turn every turn of the right knob. Reverse engaged: Neutral: First: There is a stop not to shift from the 8th to the reverse. The engine and the gearbox wouldn't appreciate. The wheels have to be connected the the red axle and the engine to the grey one. It's possible to use this gearbox for a 4WD vehicle easily since the red axle goes through the gearbox. With this gearbox you don't have to use a 8-speed gearbox and a DNR one anymore, as in the Chiron or the Sian. It saves space, and you can't engage the 4th speed whereas you are in neutral - all the speeds shift into a logic order. I will make instructions when I have time! -
Hello everybody! This is the first MOC I present on Eurobricks. My most popular MOC yet is the 3 speed auto gearbox (https://rebrickable.com/mocs/MOC-33711/lbrix/3-speed-auto-gearbox-overworked-version/?inventory=1#comments). But now to this gearbox: At first ask yourself this question: Which sense has a normal D-N-R gearbox in a manual technic car? It has no sense. It makes no difference if you are in the forward gear or in te reserve. But with this D-N-R gearbox it makes a difference, because if you are in the forward gear, you can not push the car backward and if you switch in the reserve gear, you can not push the car forward. If you want to build this gearbox into a technic car, you have to connect the grey connectors to the wheels and one of the black ones to the fake engine. For more information check out this MOC on rebrickable (maybe it is not approved yet): https://rebrickable.com/mocs/MOC-47985/lbrix/alternative-d-n-r-gearbox/?inventory=1#comments No I wanted to ask you, what you think about this D-N-R gearbox? Here is an video of my gearbox:
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1023 Speed Car MOC. A 1023 speed gearbox has been built into a remote controlled car chassis.
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
A 1023 speed gearbox has been built into a large remote controlled car chassis. The car can be steered and driven via remote control using two channels. The gears can be manually changed using ten selectors that drive ten differentials. This allows for one of 1023 different speeds to be selected to set the car's forward and reverse speeds. The car drives well on carpet as well as a smooth surface. It uses 4 large 10cm diameter wheels and a medium sized motor for the steering mechanism. The main drive is from a large power functions motor. The gearbox functions are explained in detail. -
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[MOC] Airboat with a 2-speed transmission
Parazels posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello everyone! This is my new moc! The airboat is at rest, when the propeller is rotating at low frequency, and begins moving, once the propeller has worked faster. 1 L-motor 2 M-motors Watch the video! https://youtu.be/Tiue-ojVghQ https://youtu.be/pOQoqyriUZY https://www.instagram.com/p/CIavqCVpOoy/?igshid=1lkuooe8kmue6 https://www.instagram.com/p/CIaublcJVqf/?igshid=1clc6dkfsshwd -
7+R sequential gearbox (DCT)
Leviathan posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi everyone, Lately, I read topic on Audi R8 from Jeroen Ottens (https://www.eurobricks.com/forum/index.php?/forums/topic/178368-wip-audi-r8/) and it remembers me that I had such a prototype of a sequential gearbox. It's an improved version of my sequential gearbox used on my Bugatti Chiron 1/8, lighter and more compact. I use 4 orange rotary changeover selectors. I just want to say that is only a prototype version unfinished that I wanted to share with you. Please do not judge assembly design, but system core. How does it works ? - The main shat is the center one and it's made the dual clutch shaft - On each side, there is 1 half-gearbox. One with odds speeds (1, 3, 5, 7) and the other one with even speeds (R, 2, 4, 6). - On main main shaft, there is an offset of 90° between the 2 orange changeover. Its engage only at time one of the half gearbox. The real secret of the gearbox is the offset between each half gearbox. I used a factory wheel with 2 pins with tow ball to create this offset. See the picture below : Of course, the gearbox has a end stop to prevents 7 to Reverse shifting. Ratios ; R : 1,2 1 : 0,6 2 : 0,75 3 : 1 4 : 1,67 5 : 1,8 6 : 2,1 7 : 3 The reverse speed is too fast. I worked to an improved version too, smaller that prototype. The arrow shows the right way to shift up. Finally the video to understand the mecanism : I hope you will like it ! See you soon ! -
[MOC] 12 Speed Rotary Gearbox
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here I present my 12 speed gearbox design. The gearbox implements 3 reverse speeds, a stop gear (zero speed), and 8 forward speeds. The forward speeds range from 0.307 to 1.2 and reverse from -0.067 to -0.36. The gearbox has a single gear lever to drive two rotary selectors to select the gears. Let me know if you like it, have any comments or questions. -
[MOC] 4 Speed rotary gearbox. Has this has been done like this before?
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi Everyone, I have created this 4 speed gearbox based on the "change over rotary catch" component and I have used it to select 1 of 4 gearing inputs in possibly a new way by connecting to four clutch gears which then connect to a differential housing used as a method to transfer motion whilst allowing the rotary catch to be rotated freely inside of it. The gearbox implements 3 forward speeds, and 1 reverse. I was wondering if anyone has seen this technique before (I am guessing yes since most ideas are not new)? Anyway thanks in advance. -
WIP Kraz 255B with Gearbox (For Fully RC TMM-3 Attachment)
The Vooduist posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hey y'all, First time I'm gonna try to do a WIP page... Been fiddling around with this Kraz 255b MOC by the one and only Ingmar Spijkhoven and figured out what attachment I'll build finally. In short, it's a mini portable bridge (called a TMM-3 or a scissor bridge). Functions of this add on attachment consist of- Actuator for raising and lowering the bridge Winch for deploying and retracting the bridge 2 stabilizers at the end of the truck to... stabilize the truck Propulsion has been swapped from 2 L motors on the sides to 1 one buggy motor under the hood. Now the replica engine can be put on display. The gearbox I really wanted to try part 35188 to make all the functions AND propulsion run on the one motor. Where I guess we can call the "transfer case" is at is right behind the cab, so here's what the result is for now. It was tricky since the tandem axle left no room for fit it in between the chassis rails. The rear shaft will actually hit the bottom of this when compressed all the way. It's as compact as could get it with Studio (kinda a LDD fan). It'll probably need to be reinforced even more, but wanna see how it mates with the buggy motor first. Never built a gearbox before and destroyed many other MOC's with gearboxes so don't have high hopes. Note- all of the motorized attachments will be ran with worm gears, so not to concerned with the gear ratios... buggy motor just gonna make everything super fast anyways with a Buwizz. Where buggy motor is planning to be in the future a bit more securely. Just seeing how a gearbox could be placed and how high it'll be. Part 87408 is now mounted securely below the motor with two 24t gears feeding it above (will get a shot of it soon). Getting the motor to fit underneath the hood was very miserable. Couldn't use a servo anymore since the buggy motor is so low it'll interrupt the travel of the front axle. (yes the fenders are mounted backwards when rebuilt...) Ordered the parts for the gearbox and will update once they come in. Planned order of the build- Gearbox Wheels Test drive Stabilizers Building the frame/chassis of the TMM winch Scissor bridge Survive the misery -
Automatic Torque-Sensing 4-speed Transmission
Sariel posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here's my previous transmission design equipped with a torque-sensing shifter. The result is that the transmission starts at 4th speed and shifts down lower the more resistance the output meets. It's not perfect, the shifting is jerky because of a "gap" when both transmission rings are disengaged, but it works. I'm hoping somebody can improve on it and make it shift more smoothly. And the original transmission with instructions: -
[MOC] 1,000 Speed Gearbox, create any 3 decimal gearing ratio
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here I present an MOC gearbox with 1,000 different speeds. The gearing ratios are selected using 10 switching levers each of which adds a power of 2 to the overall output gearing ratio. A down gearing of 1000 to 1024 at the end of the gearbox means any 3 digit decimal gearing ratio can be selected, for example 0.123, 0.777 or 0.017. The gearbox uses over 130 gears and 12 differentials. -
Simple Drivetrains with Torque Converter
schofieldius posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
I recently published my findings on using a sprung differential as a torque converter. I believe I have proved that a simple combination of a pb&g motor and a differential can amplify the pb&g's spring action down the drivetrain to compensate for a resistance on the wheel assembly. I would like to ask for some help with this. My mechanical engineering knowledge is topped out, and I'd really like to continue exploring this. Let me know if you have any ideas, more formal collaboration would be appreciated also. I'm looking at combining this torque converter with existing gearboxes, and also exploring its response at different speeds. http://imgur.com/gallery/IRGFReN -
[MOC] 63 Speed Gearbox instructions
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi all, a while ago I posted about my 63 speed gearbox MOC using 6 switches and some people here asked for build instructions. These are now available on Rebrickable for those interested https://rebrickable.com/mocs/MOC-40533/TechnicBrickPower/63-speed-gearbox-including-reverse/ youtube: -
[MOC] 256 Speed Gearbox using 8 switches
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here I present a 256 speed gearbox controlled by 8 switches. This design is based on a 2 differential N to P gear ratio design presented in one of my other videos. The gearbox allows 256 different gearing ratios to be selected. -
[TC18] Miniature Muscle car
Zerobricks posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
I wanted to make a small scale supercar model in the same scale as the Corvette. The TC18 was a perfect excuse to make a model with the following functions: 4 speed gearbox full working suspension a fake V8 engine working steering wheel openable doors Here is what I managed to create in LDD, inspired by the set 42111. I wanted to style the car like a 70's muscle car, so the fenders are brick-built to get the sharp lines needed. The final car is 40 studs long and 15 studs wide (excluding the mirrors). All of the described functions are implemented, the car is currently made out of around 900 pieces. I will post the WIP pics of the real build as soon as I start it. -
Understanding of a simple 4 gear box and gear ratio
Kaydash posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi all :) I've been building a good number of best supercar mocs lately, and i decided to step up my game a bit, and build a supercar (1:10) of my own. If the paneling, steering, making a chassis is Something i can do without too much trouble, it's not the same when it comes to gearbox. As i Don't want to rehash somebody else's job, or at least not completely (lol) i've been busy these past few days trying to learn how gearing works. And thx to sariel and his work, (e.g gear calculator / tutorial) i've learnt a lot already. But obviously, i'm just beginner and there is a lot i have to figure out before i can do a gearbox of my own. So i've build this one, found on internet and try to study it: I was trying to calculate gear ratio of each gear but i'm already stuck :( So question, since i can't even figure out which one of the entry is the input, hence the other being the output. Isn't a gearbox supposed to gear up whatever the gear engaged? so we'd have at the end Something like this, say: 1st: 1:6 2nd 1.4 3rd: 1.2,1 and 4rth: 1:1 (not related to the picture below) When i look at that exemple and the placement of the 1st gear, hence orange entry being the input, it appears to gear down, and hence, i've considered the red entry being the input. I'm already lost. And worse: i can clearly count that i have a 1:6 gear ratio, but when i try to calculate, the result won't match (4th gear on the picture): 24 teeth into 8 teeth: 1:3 8teeth into 16 teeth 2:1 Following grey 16teeth on a different axle is idle 16teeth into 8teeth 1:2 final ratio with math: 1:3 (calculator) but when i count 6 révolutions for the last gear, so i'should have a 1:6 ratio What am i missing here? thx for helping me guys! Sorry for the noob questions, but everything's gotta be a lot easier once i figure this out :) -
63 Speed Gearbox with multiple reverse speeds
TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
I have made my first gearbox using differentials. It's a 63 speed gear box using 6 selectors. The gearbox implements all gear ratios from -32:1 to 31:1 using five differentials. -
[MOC] Custom Streetfighter
nikolyakov posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi to all, I like motorcycles so i made another one. Functions are, flat4 motor, simple 2 speed gearbox and of course suspension. IMG_20200302_162553 by nikolyakov, on Flickr IMG_20200302_162554 by nikolyakov, on Flickr IMG_20200302_162707 by nikolyakov, on Flickr IMG_20200302_162708 by nikolyakov, on Flickr IMG_20200302_162821 by nikolyakov, on Flickr -
[MOC] Lola Aston Martin B09/60 LMP1
Leviathan posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi everyone ! Today I'm glad to present my latest creation : a replica of a Le Mans Prototype, the Lola Aston Martin ! See below the result, I worked on this creation during 1,5 month : SPECIFICATIONS : - Fake V12 engine - Independent pushrod type suspensions - Steering by HOG + Working steering wheel - 4 speeds sequential transmission + paddle shifting - Rear cover articulated - Elytre openable doors DESIGN : I used this part https://www.bricklink.com/v2/catalog/catalogitem.page?P=24118#T=C from 42056 Porsche to create the cockpit front curved shape. Into the cockpit you can find some details sport wheel and seat. The dashboard include speed indicator serigraphed tile but also green/red indicators to speeds shifting. Paddle shifting is created by 2 short yellow liftarms. You can notice presence of a red extinguisher ! Red and white pins indicate two sides of the paddle shifting ! FEATURES : To create the HOG, I used one couple of knobs and one couple of 16t. A friction axle avoid steering free wheeling. In other hand, doors are openable. For the rear cover, I used Nathanaël Kuipers tips to keep it open with friction like NK03 (https://www.nkubate.com/predator-supercar/) The fake V12 engine is a Crowkillers design : https://bricksafe.com/pages/Crowkillers/mini-v12 The sound it makes in functions of speeds is awesome ! Supensions pushrod system is a copy slightly modified of 8674 set. For the front pushrod I re-used Nico71 design like on his own LMP1 : https://www.nico71.fr/lmp1-racecar/ I created my own 4 speeds gearbox for this model. It's a flat design like 42056 Porsche one but there are less gears so less friction. I use blue rubber for the 90° indexor. See how its works in the video bellow. Ratios (without diff) : 1 : 1:1 2 : 1:1,667 3 : 1:3 4 : 1:5 I put a paddle shifting in the back of the car to up and down gearbox speeds. I re-designed 42083 shifter to make it smaller. MODULARITY : Main assembly is easily operate by a modular design. There are 6 modules and 2 structural elements. Cockpit itself is a part of main structure. I choose this kind of design in order to make instructions in the future. VIDEO : INSPIRATION : I'm sharing links of creations that somewhere gave me ideas for my Moc : https://www.hellobricks.com/2017/01/porsche-919-le-mans/ https://pikdo.biz/p/kimkamza/2048722475702589051_176999168 https://www.flickr.com/photos/158776396@N06/32215776147/in/album-72157676668829937/ https://www.eurobricks.com/forum/index.php?/forums/topic/138348-porsche-962-c-le-mans-racer-in-185/ http://www.techlug.fr/Forum/viewtopic.php?f=5&t=10823&start=45 I hope you'll like it See full HD gallery on Flickr : https://www.flickr.com/photos/147164115@N07/albums/72157712427943327/with/49298358508/ See you !
