Highly flexible electric excavator

Abstract

The utility model discloses high flexibility's electric excavator, including excavator main part, the inner surface movable installation of excavator main part has movable seat. The utility model discloses through setting up main shaft, lifting device, moving device and movable foot pad, through drive switch control drive arrangement, and drive arrangement drives main shaft rotation again, wherein the two reverse thread transmission adjusting plate of first threaded rod middle part moves towards, and drives adjusting wheel, connecting rod and the bottom end of adjusting lever move towards, thereby chair falls, drive arrangement drives main shaft rotation, thereby makes the tail of first threaded rod rotate in the thread groove, makes the chair be pushed out to the front, makes the driver be closer to the driving equipment, drive arrangement drives main shaft rotation, simultaneously driving gear drive driven gear, and the second threaded rod autorotation of making, because the size of foot pad support and the size of drive box are mutually adapted, thereby making foot pad support drop along the left and right sides of drive box, thereby improve the flexibility of excavator seat.

Description

Technical Field

[0001] This utility model relates to the field of electric excavator technology, and more specifically, to a highly flexible electric excavator. Background Technology

[0002] An excavator, also known as a digger, is an earthmoving machine that uses a bucket to dig materials above or below the machine's bearing surface and load them into transport vehicles or unload them into a stockpile. A common excavator structure includes a power unit, working device, slewing mechanism, control mechanism, transmission mechanism, traveling mechanism, and auxiliary facilities. Traditional excavators use diesel fuel to power the entire machine, while modern excavators typically use electricity to reduce environmental pollution in response to environmental policies. Currently, electric excavators are often used to dig irrigation ditches near farmland during rural ditch construction.

[0003] The operating equipment of existing electric excavators is relatively fixed in front of the cab, and the seat is fixed inside the cab, which has poor flexibility and is often quite restrictive. For drivers of different body types, their height and arm length will vary, and existing electric excavators cannot adjust the height of the seat or the distance between the seat and the operating equipment. Therefore, drivers of different body types cannot drive existing electric excavators in the most comfortable state.

[0004] Therefore, based on this, the inventor, drawing on years of experience in design, development and actual manufacturing in the relevant industry, researched and improved the existing structure and its shortcomings to provide a highly flexible electric excavator, aiming to achieve greater seat flexibility. Utility Model Content

[0005] To overcome the aforementioned deficiencies of the prior art, embodiments of this utility model provide a highly flexible electric excavator. This utility model allows for convenient adjustment of the seat height by incorporating a spindle and lifting device; it also allows for adjustment of the distance between the seat and the driving equipment by incorporating a movable device; and it prevents the driver's heels from rubbing against the lifting device by incorporating movable foot pads, and the height of the foot pads can be adjusted according to the driver's body type, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a highly flexible electric excavator, comprising an excavator body, wherein a movable seat is movably installed on the inner surface of the excavator body; a threaded groove is provided on the back side inside the excavator body, a first wheel groove is provided on the bottom surface inside the excavator body, and a limit block is fixedly installed on the bottom surface inside the excavator body.

[0007] In a preferred embodiment, the movable seat includes a chair, a drive switch is fixedly installed in the center of the front of the chair, a telescopic tube is detachably installed in the front of the bottom surface of the drive switch, a drive device is detachably installed at the bottom end of the telescopic tube, a main shaft is detachably installed in the center of the right side of the drive device, a lifting device is movably installed in the center of the outer surface of the main shaft, a moving device is fixedly installed in the center of the bottom surface of the lifting device, and a movable foot pad is movably installed on the top surface of the front of the moving device.

[0008] In a preferred embodiment, the tail of the spindle is movably mounted on the inner surface of the threaded groove, the bottom of the moving device is movably mounted on the inner surface of the first wheel groove, the head of the spindle is movably mounted on the head of the moving device, the top of the lifting device is fixedly mounted on the bottom surface of the chair, the telescopic tube is provided with wires inside, and the drive switch is electrically connected to the drive device through the wires inside the telescopic tube.

[0009] In a preferred embodiment, the spindle includes a first threaded rod, a first limiting ring is fixedly installed at the tail end of the first threaded rod, a second limiting ring is fixedly installed at the head end of the first threaded rod, and a drive gear is fixedly installed at the head end of the first threaded rod.

[0010] In a preferred embodiment, the drive gear is positioned in front of the second limiting ring, the tail end of the first threaded rod is movably mounted on the inner surface of the threaded groove, and the head end of the first threaded rod is detachably mounted in the middle of the drive device.

[0011] In a preferred embodiment, the lifting device includes a base plate, a buffer block is fixedly installed on the top surface of the base plate, a mounting frame is fixedly installed on the top surface of the base plate, a second wheel groove is formed in the middle of the top surface of the mounting frame, a plate groove is formed in the middle of the base plate, a connecting rod is movably installed in the middle of the side of the mounting frame, adjusting wheels are movably installed at both ends of the connecting rod, an adjusting plate is movably installed in the middle of the outer surface of the connecting rod, a threaded hole is formed in the middle of the adjusting plate, an adjusting rod is movably installed in the middle of the adjusting wheel, and a connecting piece is movably installed at the top of the adjusting rod.

[0012] In a preferred embodiment, the center of the base plate is movably mounted on the outer surface of the first threaded rod, the base plate is positioned between the first limiting ring and the second limiting ring, the outer surface of the adjusting wheel is movably mounted inside the second wheel groove, the left and right sides of the adjusting plate are movably mounted on the inner surface of the plate groove, the inner surface of the threaded hole is movably mounted on the center of the outer surface of the first threaded rod, and the top of the connector is fixedly mounted on the bottom surface of the chair.

[0013] In a preferred embodiment, the mobile device includes a mobile frame, a connecting block is fixedly installed in the middle of the outer surface of the rear of the mobile frame, and mobile wheels are movably installed at both the left and right ends of the front and rear of the mobile frame. A drive box is fixedly installed in the middle of the outer surface of the front of the mobile frame. A first limiting hole is opened in the middle of the back of the drive box, and a second limiting hole is opened in the middle of the top surface of the drive box. The inner surface of the front of the drive box is detachably installed on the bottom surface of the drive device.

[0014] In a preferred embodiment, the top end of the connecting block is fixedly installed in the middle of the bottom surface of the tail of the base plate, the outer surface of the movable wheel is movably installed on the inner surface of the first wheel groove, and the inner surface of the first limiting hole is movably installed in the middle of the second limiting ring.

[0015] In a preferred embodiment, the movable foot pad includes a second threaded rod, a limiting disc fixedly mounted at the top end of the second threaded rod, a driven gear fixedly mounted at the bottom end of the second threaded rod, a foot bracket movably mounted on the outer surface of the middle part of the second threaded rod, and the bottom of the outer surface of the second threaded rod movably mounted on the inner surface of the second limiting hole. The bottom of the driven gear is meshed with the outer surface of the driving gear.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] 1. This utility model, by setting up a main shaft and a lifting device, allows for convenient use by drivers of short stature. A drive switch controls the drive device, which in turn drives the main shaft to rotate. Two opposing threaded transmission adjustment plates in the middle of the first threaded rod move towards each other, causing the adjusting wheel, connecting rod, and the bottom end of the adjusting rod to move towards each other, thus lowering the chair. When it reaches the bottom, a buffer block cushions the chair, reducing damage to the lifting device parts caused by gravity. Conversely, the chair can be raised. The maximum adjustable lifting height of the lifting device is consistent with the maximum adjustable lifting height of the telescopic tube. This structure allows for convenient adjustment of the seat height, improving the equipment's flexibility.

[0018] 2. This utility model incorporates a moving device. For drivers with shorter statures and relatively shorter limbs, a drive switch controls the drive device, which in turn drives the main shaft to rotate. This causes the tail of the first threaded rod to rotate within the threaded groove, pushing the chair forward and bringing the driver closer to the driving equipment. The first and second limiting rings clamp the lifting device and the chair, and the chair height and its distance from the driving equipment can be adjusted synchronously. This structure allows for adjustment of the chair's distance from the driving equipment, thereby improving the equipment's flexibility.

[0019] 3. This utility model, by setting a movable foot pad, prevents the driver's heel from rubbing against the lifting device when adjusting the distance between the chair and the driving equipment. The driver first places their feet on the foot pad, then controls the drive device through the drive switch. The drive device then drives the main shaft to rotate, and at the same time, the active gear drives the driven gear, causing the second threaded rod to rotate. Since the size of the foot pad is compatible with the size of the drive box, the foot pad descends along the left and right sides of the drive box. The height of the foot pad can be adjusted synchronously with the height of the chair and the distance between the driver and the driving equipment. Using the above structure, the driver's heel is prevented from rubbing against the lifting device, and the height of the foot pad can be adjusted according to the driver's body shape, thereby further improving the flexibility of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the three-dimensional assembly structure of this utility model.

[0022] Figure 3 This is a schematic diagram of the disassembled structure of the movable seat of this utility model.

[0023] Figure 4 This is a schematic diagram of the main shaft structure of this utility model.

[0024] Figure 5 This is a schematic diagram of the lifting device structure of this utility model.

[0025] Figure 6 This is a schematic diagram of the mobile device structure of this utility model.

[0026] Figure 7 This is a schematic diagram of the movable foot pad structure of this utility model.

[0027] The attached figures are labeled as follows: 1. Excavator body; 2. Movable seat; 11. Threaded groove; 12. First wheel groove; 13. Limiting block; 21. Chair; 22. Drive switch; 23. Telescopic tube; 24. Drive unit; 25. Spindle; 26. Lifting device; 27. Moving device; 28. Movable foot pad; 251. First threaded rod; 252. First limiting ring; 253. Second limiting ring; 254. Drive gear; 261. Base plate; 262. Buffer block; 26 3. Mounting bracket; 264. Second wheel groove; 265. Plate groove; 266. Connecting rod; 267. Adjusting wheel; 268. Adjusting plate; 269. Threaded hole; 2610. Adjusting rod; 2611. Connecting piece; 271. Moving frame; 272. Connecting block; 273. Moving wheel; 274. Drive box; 275. First limiting hole; 276. Second limiting hole; 281. Second threaded rod; 282. Limiting disc; 283. Driven gear; 284. Foot pad. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] As attached Figure 1-7 The high-flexibility electric excavator shown includes an excavator body 1, on which a movable seat 2 is movably mounted; a threaded groove 11 is provided on the back side inside the excavator body 1, a first wheel groove 12 is provided on the bottom surface inside the excavator body 1, and a limit block 13 is fixedly installed on the bottom surface inside the excavator body 1.

[0030] As attached Figure 3 To be continued Figure 5The movable seat 2 includes a chair 21. A drive switch 22 is fixedly installed in the center of the front of the chair 21. A telescopic tube 23 is detachably installed on the front of the bottom surface of the drive switch 22. A drive device 24 is detachably installed at the bottom end of the telescopic tube 23. A main shaft 25 is detachably installed in the center of the right side of the drive device 24. A lifting device 26 is movably installed in the center of the outer surface of the main shaft 25. A moving device 27 is fixedly installed in the center of the bottom surface of the lifting device 26. A movable foot pad 28 is movably installed on the top surface of the front of the moving device 27. The tail of the main shaft 25 is movably installed on the inner surface of the threaded groove 11. The bottom of the moving device 27 is movably installed in the first wheel groove 12. On the inner surface, the head of the main shaft 25 is movably mounted on the head of the moving device 27, the top of the lifting device 26 is fixedly mounted on the bottom surface of the chair 21, the telescopic tube 23 has wires inside, and the drive switch 22 is electrically connected to the drive device 24 through the wires inside the telescopic tube 23. The main shaft 25 includes a first threaded rod 251, a first limiting ring 252 is fixedly mounted on the tail of the first threaded rod 251, a second limiting ring 253 is fixedly mounted on the head of the first threaded rod 251, and a drive gear 254 is fixedly mounted on the head of the first threaded rod 251. The drive gear 254 is located in front of the second limiting ring 253, and the tail of the first threaded rod 251... The first threaded rod 251 is detachably mounted on the inner surface of the threaded groove 11. The lifting device 26 includes a base plate 261, a buffer block 262 is fixedly mounted on the top surface of the base plate 261, and a mounting bracket 263 is fixedly mounted on the top surface of the base plate 261. A second wheel groove 264 is formed in the middle of the top surface of the mounting bracket 263. A plate groove 265 is formed in the middle of the middle of the side of the mounting bracket 263. An adjusting wheel 267 is movably mounted on both the left and right ends of the connecting rod 266. An adjusting plate 268 is movably mounted on the middle of the outer surface of the connecting rod 266. A threaded hole 269 is provided in the middle. An adjusting rod 2610 is movably installed in the middle of the adjusting wheel 267. A connecting piece 2611 is movably installed at the top of the adjusting rod 2610. The middle of the base plate 261 is movably installed on the outer surface of the first threaded rod 251. The base plate 261 is located between the first limiting ring 252 and the second limiting ring 253. The outer surface of the adjusting wheel 267 is movably installed inside the second wheel groove 264. The left and right sides of the adjusting plate 268 are movably installed on the inner surface of the plate groove 265. The inner surface of the threaded hole 269 is movably installed in the middle of the outer surface of the first threaded rod 251. The top of the connecting piece 2611 is fixedly installed on the bottom surface of the chair 21.

[0031] Specifically, when used by a short driver, the drive switch 22 controls the drive device 24, which in turn drives the main shaft 25 to rotate. The two opposing threaded transmission adjustment plates 268 in the middle of the first threaded rod 251 move towards each other, causing the bottom ends of the adjustment wheel 267, connecting rod 266, and adjustment rod 2610 to move towards each other, thus lowering the chair 21. When it reaches the bottom, the buffer block 262 cushions the chair 21, reducing damage to the parts of the lifting device 26 caused by gravity. Conversely, the chair 21 can be raised. The maximum adjustable lifting height of the lifting device 26 is the same as the maximum adjustable lifting height of the telescopic tube 23. Using this structure, the seat height can be easily adjusted, improving the equipment's flexibility.

[0032] As attached Figure 6 The mobile device 27 includes a mobile frame 271. A connecting block 272 is fixedly installed in the middle of the outer surface of the tail of the mobile frame 271. The left and right ends of the front and rear of the mobile frame 271 are movably installed with mobile wheels 273. A drive box 274 is fixedly installed in the middle of the outer surface of the front of the mobile frame 271. A first limiting hole 275 is opened in the middle of the back of the drive box 274. A second limiting hole 276 is opened in the middle of the top surface of the drive box 274. The inner surface of the front of the drive box 274 is detachably installed on the bottom surface of the drive device 24. The top end of the connecting block 272 is fixedly installed in the middle of the bottom surface of the tail of the base plate 261. The outer surface of the mobile wheel 273 is movably installed on the inner surface of the first wheel groove 12. The inner surface of the first limiting hole 275 is movably installed in the middle of the second limiting ring 253.

[0033] Specifically, the short-statured driver has relatively short limbs. The drive switch 22 controls the drive device 24, which in turn drives the main shaft 25 to rotate. This causes the tail of the first threaded rod 251 to rotate inside the threaded groove 11, pushing the chair 21 forward and bringing the driver closer to the driving equipment. The first limiting ring 252 and the second limiting ring 253 clamp the lifting device 26 and the chair 21. The height of the chair 21 and its distance from the driving equipment can be adjusted synchronously. Using the above structure, the distance between the chair 21 and the driving equipment can be adjusted to improve the flexibility of the equipment.

[0034] As attached Figure 7 The movable foot pad 28 includes a second threaded rod 281, a limiting disc 282 fixedly installed at the top end of the second threaded rod 281, a driven gear 283 fixedly installed at the bottom end of the second threaded rod 281, a foot pad bracket 284 movably installed on the outer surface of the middle part of the second threaded rod 281, and the bottom of the outer surface of the second threaded rod 281 movably installed on the inner surface of the second limiting hole 276. The bottom of the driven gear 283 is meshed on the outer surface of the driving gear 254.

[0035] Specifically, when adjusting the distance between the chair 21 and the driving equipment, it is easy for the driver's heel to rub against the lifting device 26. The driver first places his feet on the footrest 284, and then controls the drive device 24 through the drive switch 22. The drive device 24 then drives the main shaft 25 to rotate. At the same time, the drive gear 254 drives the driven gear 283, causing the second threaded rod 281 to rotate. Since the size of the footrest 284 is compatible with the size of the drive box 274, the footrest 284 descends along the left and right sides of the drive box 274. The height of the footrest 284 can be adjusted synchronously with the height of the chair 21 and the distance between the driver and the driving equipment. With the above structure, the driver's heel is prevented from rubbing against the lifting device 26. Moreover, the height of the footrest 284 can be adjusted according to the driver's body shape, thereby further improving the flexibility of the equipment.

[0036] The working principle of this utility model is as follows: When a driver of short stature uses the device, the drive switch 22 controls the drive device 24, which in turn drives the main shaft 25 to rotate. The two reverse threaded transmission adjustment plates 268 in the middle of the first threaded rod 251 move towards each other, which in turn drives the bottom ends of the adjustment wheel 267, the connecting rod 266 and the adjustment rod 2610 to move towards each other, thereby lowering the chair 21. When it reaches the bottom, the buffer block 262 cushions the chair 21, reducing damage to the parts of the lifting device 26 caused by gravity. Conversely, the chair 21 can be raised. The maximum adjustable lifting height of the lifting device 26 is the same as the maximum adjustable lifting height of the telescopic tube 23.

[0037] The short-statured driver has relatively short limbs. The drive switch 22 controls the drive device 24, which in turn drives the main shaft 25 to rotate. This causes the tail of the first threaded rod 251 to rotate inside the threaded groove 11, pushing the chair 21 forward and bringing the driver closer to the driving equipment. The first limiting ring 252 and the second limiting ring 253 clamp the lifting device 26 and the chair 21, and the height of the chair 21 and its distance from the driving equipment can be adjusted synchronously.

[0038] When adjusting the distance between the chair 21 and the driving equipment, it is easy for the driver's heel to rub against the lifting device 26. The driver first places his feet on the footrest 284, and then controls the drive device 24 through the drive switch 22. The drive device 24 then drives the main shaft 25 to rotate. At the same time, the drive gear 254 drives the driven gear 283, causing the second threaded rod 281 to rotate. Since the size of the footrest 284 is compatible with the size of the drive box 274, the footrest 284 descends along the left and right sides of the drive box 274. The height of the footrest 284 can be adjusted synchronously with the height of the chair 21 and the distance between the driver and the driving equipment.

[0039] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0040] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0041] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-flexibility electric excavator comprising an excavator main body (1), characterized in that, A movable seat (2) is movably installed on the inner surface of the excavator body (1). A threaded groove (11) is opened on the back side inside the excavator body (1). A first wheel groove (12) is opened on the bottom surface inside the excavator body (1). A limit block (13) is fixedly installed on the bottom surface inside the excavator body (1). The movable seat (2) includes a chair (21). A drive switch (22) is fixedly installed in the middle of the front of the chair (21). A telescopic tube (23) is detachably installed on the front of the bottom surface of the drive switch (22). A drive device (24) is detachably installed at the bottom end of the telescopic tube (23). A spindle (25) is detachably installed in the middle of the right side of the drive device (24). A lifting device (26) is movably installed in the middle of the outer surface of the spindle (25). A moving device (27) is fixedly installed in the middle of the bottom surface of the lifting device (26). A movable foot pad (28) is movably installed on the top surface of the front of the moving device (27). The tail of the main shaft (25) is movably mounted on the inner surface of the threaded groove (11), the bottom of the moving device (27) is movably mounted on the inner surface of the first wheel groove (12), the head of the main shaft (25) is movably mounted on the head of the moving device (27), the top of the lifting device (26) is fixedly mounted on the bottom surface of the chair (21), the telescopic tube (23) is provided with wires, and the drive switch (22) is electrically connected to the drive device (24) through the wires inside the telescopic tube (23).

2. The high-mobility electric excavator according to claim 1, characterized by: The main shaft (25) includes a first threaded rod (251), a first limiting ring (252) is fixedly installed at the tail of the first threaded rod (251), a second limiting ring (253) is fixedly installed at the head of the first threaded rod (251), and a drive gear (254) is fixedly installed at the head of the first threaded rod (251).

3. The high-mobility electro-digging machine according to claim 2, characterized in that: The position of the drive gear (254) is in front of the second limiting ring (253), the tail end of the first threaded rod (251) is movably mounted on the inner surface of the threaded groove (11), and the head end of the first threaded rod (251) is detachably mounted in the middle of the drive device (24).

4. The high-mobility electro-digging machine according to claim 1, wherein: The lifting device (26) includes a base plate (261), a buffer block (262) is fixedly installed on the top surface of the base plate (261), a mounting frame (263) is fixedly installed on the top surface of the base plate (261), a second wheel groove (264) is opened in the middle of the top surface of the mounting frame (263), a plate groove (265) is opened in the middle of the base plate (261), a connecting rod (266) is movably installed in the middle of the side of the mounting frame (263), an adjusting wheel (267) is movably installed at both ends of the connecting rod (266), an adjusting plate (268) is movably installed in the middle of the outer surface of the connecting rod (266), a threaded hole (269) is opened in the middle of the adjusting plate (268), an adjusting rod (2610) is movably installed in the middle of the adjusting wheel (267), and a connecting piece (2611) is movably installed at the top of the adjusting rod (2610).

5. The high-mobility electro-digging machine according to claim 4, characterized in that: The middle part of the base plate (261) is movably mounted on the outer surface of the first threaded rod (251). The base plate (261) is positioned between the first limiting ring (252) and the second limiting ring (253). The outer surface of the adjusting wheel (267) is movably mounted inside the second wheel groove (264). The left and right sides of the adjusting plate (268) are movably mounted on the inner surface of the plate groove (265). The inner surface of the threaded hole (269) is movably mounted on the middle part of the outer surface of the first threaded rod (251). The top of the connector (2611) is fixedly mounted on the bottom surface of the chair (21).

6. The high-mobility electro-digging machine according to claim 1, characterized in that: The mobile device (27) includes a mobile frame (271), a connecting block (272) is fixedly installed in the middle of the outer surface of the tail of the mobile frame (271), and a mobile wheel (273) is movably installed at both the left and right ends of the head and tail of the mobile frame (271). A drive box (274) is fixedly installed in the middle of the outer surface of the head of the mobile frame (271). A first limiting hole (275) is opened in the middle of the back of the drive box (274), and a second limiting hole (276) is opened in the middle of the top surface of the drive box (274). The inner surface of the front of the drive box (274) is detachably installed on the bottom surface of the drive device (24).

7. The high-mobility electro-digging machine according to claim 6, characterized in that: The top of the connecting block (272) is fixedly installed in the middle of the bottom surface of the tail of the base plate (261), the outer surface of the moving wheel (273) is movably installed on the inner surface of the first wheel groove (12), and the inner surface of the first limiting hole (275) is movably installed in the middle of the second limiting ring (253).

8. The high-mobility electro-digging machine according to claim 2, characterized in that: The movable foot pad (28) includes a second threaded rod (281), a limiting disc (282) is fixedly installed at the top of the second threaded rod (281), a driven gear (283) is fixedly installed at the bottom of the second threaded rod (281), a foot bracket (284) is movably installed on the outer surface of the middle part of the second threaded rod (281), the bottom of the outer surface of the second threaded rod (281) is movably installed on the inner surface of the second limiting hole (276), and the bottom of the driven gear (283) is meshed on the outer surface of the driving gear (254).

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