CN220299508U

CN220299508U - Transmission case

Info

Publication number: CN220299508U
Application number: CN202322030112.9U
Authority: CN
Inventors: 武中华
Original assignee: Hangzhou Endless Window Energy Saving Technology Co ltd
Current assignee: Hangzhou Endless Window Energy Saving Technology Co ltd
Priority date: 2023-07-29
Filing date: 2023-07-29
Publication date: 2024-01-05
Anticipated expiration: 2033-07-29

Abstract

The utility model provides a transmission case, which comprises a transmission case body, transmission case steering wheels, a support frame for the transmission case steering wheels and position adjusting pieces for the transmission case steering wheels, wherein the support frame for the transmission case steering wheels is arranged on the transmission case body and matched with the transmission case steering wheels, the number of the position adjusting pieces for the transmission case steering wheels is multiple, one side with the longest length on the support frame for the transmission case steering wheels is arranged along the extending direction of a guide rail cavity, and all the position adjusting pieces for the transmission case steering wheels are sequentially arranged on one side with the longest length on the support frame for the transmission case steering wheels at intervals along the extending direction of the guide rail cavity. The transmission case has the function of adjusting the tightness of the transmission piece.

Description

Transmission case

Technical Field

The utility model belongs to the technical field of guide rail conveying equipment, and particularly relates to a transmission case in the guide rail conveying equipment for conveying objects with lighter mass.

Background

The background information provided in this section that pertains to the present utility model may not all be prior art and may exist that do not constitute prior art.

And a rail conveying device having a function of conveying the object on a preset path.

At present, along with the continuous development of cities and villages, the living standard of people is also continuously improved, and the guide rail conveying equipment is applied to a plurality of scenes related to daily life of people, such as home decoration, exhibition and the like.

The guide rail conveying equipment comprises a transmission case (which can be divided into a main transmission case and an auxiliary transmission case), a guide rail, a transmission piece, a pulley and other parts. The transmission member needs to be wound around the two gear boxes.

When the guide rail conveying device is installed, the total length of the conveying member needs to be determined according to the distance between the two transmission boxes and the radius of the two transmission boxes, but the length of the conveying member actually manufactured is different from the length of the conveying member actually required or is small enough to be considered, however, after the guide rail conveying device is operated for a period of time, the length of the conveying member can be prolonged, so that the conveying member is loosened when being matched with the two transmission boxes, the conveying member is problematic when being operated, and the conveyed objects can be unstable when being operated along with the conveying member.

For the above situation, the total length of the transmission member is readjusted, i.e. the transmission member is firstly unloaded from the two transmission boxes, then unnecessary transmission members are cut off, and finally the cut transmission member is reinstalled on the two transmission boxes, so that the cut transmission member is not in a loose state when being matched with the two transmission boxes again.

Disclosure of Invention

The utility model aims to provide a transmission case, wherein a transmission case steering wheel is detached from a position adjusting piece for the transmission case steering wheel which is matched with the transmission case steering wheel currently, the transmission case steering wheel is matched with a position adjusting piece for the transmission case steering wheel which is positioned on a support frame for the transmission case steering wheel and is positioned at other positions, namely, the position of the transmission case steering wheel along the extending direction of a guide rail cavity is changed, so that a loose state does not appear when the transmission piece is matched with the two transmission cases.

Based on the above object, the present utility model proposes a transmission case for cooperation with an external guide rail through which a guide rail cavity is provided along its longitudinal direction, characterized in that the transmission case comprises:

one side of the transmission box body is provided with a transmission box opening, a transmission box cavity is formed in the transmission box body, and the transmission box cavity is communicated with the outside through the transmission box opening;

steering wheels of the transmission case;

the support frame for the steering wheel of the transmission case is arranged on the transmission case body and is matched with the steering wheel of the transmission case; and

the number of the position adjusting parts for the steering wheels of the transmission case is a plurality of the position adjusting parts which are arranged on the supporting frame for the steering wheels of the transmission case;

when the transmission case is matched with the guide rail, one side with the longest length of the support frame for the steering wheel of the transmission case is arranged along the extending direction of the guide rail cavity, and all the position adjusting pieces for the steering wheel of the transmission case are sequentially arranged on one side with the longest length of the support frame for the steering wheel of the transmission case at intervals along the extending direction of the guide rail cavity.

In one example, the support frame for the steering wheel of the transmission case is detachably connected with the transmission case;

one part of the supporting frame for the steering wheel of the transmission case is arranged on the transmission case body, and the other parts are not connected with the transmission case body.

In one example, further comprising:

the limiting piece for the steering wheel supporting frame is arranged in the transmission case body and used for limiting the transverse moving position of the supporting frame for the steering wheel of the transmission case along the transmission case body.

In one example, a portion of the transmission case steering wheel support frame connected to the transmission case body is located on an end of the transmission case steering wheel support frame extending in the longitudinal direction on a side of the transmission case steering wheel support frame having the longest length.

In one example, a portion of the gear box that is connected to the gear box steering wheel support bracket is located on a side of the gear box opposite the gear box opening.

In one example, a portion of the gearbox wheel support extends out of the gearbox opening, and when the gearbox is mated with the rail, a portion of the gearbox wheel support extends out of the gearbox opening into a rail cavity on the rail;

at least one limiting piece for the steering wheel supporting frame is arranged on one part of the steering wheel supporting frame of the transmission case, which extends out of the opening of the transmission case.

In one example, the support frame for the gearbox steering wheel is of a U-shaped structure, the bottom of the U-shaped structure is a part connected with the gearbox, two sides of the U-shaped structure are two sides with the longest length on the support frame for the gearbox steering wheel, a mounting area for the gearbox steering wheel for placing the gearbox steering wheel is reserved between the two sides with the longest length, the two sides of the U-shaped structure are respectively provided with position adjusting pieces for the gearbox steering wheel and are arranged in a one-to-one correspondence manner, and at least one pair of position adjusting pieces for the gearbox steering wheel in the one-to-one correspondence manner are matched with one gearbox steering wheel.

In one example, at least two pairs of position adjusting parts for steering wheels of the transmission case are arranged on two sides of the U-shaped structure in a one-to-one correspondence manner;

the number of the transmission case steering wheels arranged on the support frame for the transmission case steering wheels is at least two;

each transmission case steering wheel is matched with a pair of transmission case steering wheel position adjusting parts which are arranged on two sides of the U-shaped structure and are arranged in a one-to-one correspondence manner.

In one example, further comprising:

the supporting piece for the steering wheel supporting frame is directly or indirectly arranged on the transmission case body and is used for supporting the supporting frame for the steering wheel of the transmission case.

In one example, at least one of the supporting pieces for the bogie wheel supporting frames extends along a length direction of a side of the bogie wheel supporting frame for the gearbox, which is longest in length, in one-to-one correspondence with the supporting piece for the bogie wheel supporting frame for the gearbox, so as to directly support the side of the bogie wheel supporting frame for the gearbox, which is longest in length, in one-to-one correspondence with the supporting piece for the bogie wheel supporting frame for the gearbox.

Additional aspects and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1A is a schematic structural diagram of one view angle in accordance with one embodiment of the present disclosure.

Fig. 1B is a schematic side view of another perspective in accordance with one embodiment of the present disclosure.

Fig. 1C is a schematic front view in one embodiment according to the present disclosure.

Fig. 1D is a schematic rear view in accordance with one embodiment of the present disclosure.

Fig. 1E is a schematic top view in one embodiment according to the present disclosure.

Fig. 1F is a schematic bottom view in one embodiment according to the present disclosure.

Fig. 1G is an exploded schematic view of one view angle in accordance with one embodiment of the present disclosure.

Fig. 1H is an exploded schematic view of another view in accordance with one embodiment of the present disclosure.

The figures are for illustrative purposes only and are not intended to be drawn to scale. In the drawings, the same reference numerals are used to indicate the same elements. For purposes of clarity, not every component may be labeled in every drawing.

Detailed Description

The utility model will be described below with reference to several examples. It should be appreciated that these embodiments are described so that those of ordinary skill in the art may better understand and practice the present utility model, and do not represent or imply any limitation on the scope of the present utility model.

The guide rail conveying device (also called as guide rail conveying device, guide rail conveying system or guide rail conveying device) generally comprises a main transmission case (i.e. a transmission case matched with a driving motor), an auxiliary transmission case (i.e. a transmission case not matched with the driving motor), a guide rail (in which a guide rail cavity is arranged), a conveying belt (a structure of a conveying member or other structures), a pulley (which belongs to a moving vehicle and adopts a sliding moving mode or a rolling moving mode), and the like, wherein two ends of the conveying belt need to be wound on the main transmission case and the auxiliary transmission case, and the middle part of the conveying belt is penetrated in the guide rail. The pulley is connected with the transmission belt, and the transmission belt drives the pulley to move along the length setting direction of the guide rail.

When the driving motor is not installed in the guide rail conveying equipment, the structure of the main transmission case is basically the same as that of the auxiliary transmission case.

The conveyor belt in the installed rail conveyor apparatus needs to maintain a suitable tightness, i.e. if the conveyor belt is too loose, it affects its operation (i.e. the drive motor, while rotating, the conveyor belt cannot rotate at an adapted speed within the closed structure, even does not rotate at all); and if the conveyor belt is too tight, the resistance to movement is increased, and the drive motor is required to expend more work to drive the conveyor belt to rotate within the closed configuration.

Due to the machine itself, it is inevitable that the belt length will occur during a period of operation of the rail transport apparatus, resulting in an increased probability of the transport member slackening.

Therefore, the conveyor belt needs to be taken down first, then whether the working strength of the conveyor belt can meet the transmission requirement is detected, if the conveyor belt cannot meet the transmission requirement, a new conveyor belt needs to be replaced, and if the conveyor belt cannot meet the transmission requirement, a part of the conveyor belt which is out needs to be cut off and reinstalled.

How to design a guide rail conveying equipment like this, to appear because of becoming long and lax at the transmission band in-process of using one section, and the firm degree of this transmission band self can also satisfy work demand, how to adjust the elasticity of the transmission band that is located on this guide rail conveying equipment more fast, more portably, has become the long-standing puzzled problem of this field of skill.

In one example of a gear box of the present disclosure, as shown in fig. 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, is a secondary gear box 200, including a box body, a steering wheel, a support frame, and a position adjustment member. The details are as follows.

Box body

The shell of the transmission case is usually made of engineering plastic, and can be manufactured into a required shell structure through an injection molding process.

As shown in fig. 1A, 1C, and 1H, which are examples of the case, a hollow transmission case cavity 213 is formed in the transmission case 211, and serves to accommodate components located therein.

As shown in fig. 1A, 1C, and 1H, a transmission case opening 212 is formed on one side of the transmission case 211, and the transmission case opening 212 communicates with a transmission case cavity 213 in the transmission case 211.

The gear box opening 212 is provided to accommodate the components to be installed in the gear box cavity 213.

Steering wheel

To install an important component in the case, as shown in fig. 1A, 1C, 1E, 1G, and 1H, which is an example of the steering wheel, the transmission case steering wheel 221 is used to change the running direction of a conveyor belt (a structure of a conveyor in a rail conveyor) that acts with it. It may be fixed to the transmission case 211, i.e., the transmission case steering wheel 221 does not rotate; or the transmission case body 211 may be rotatably connected, that is, the transmission case body 211 is provided with a transmission case steering wheel shaft 222, the transmission case steering wheel shaft 222 may be fixedly or rotatably provided on the transmission case body 211, and a central hole on the transmission case steering wheel 221 is provided on the transmission case steering wheel shaft 222. The gearbox steering wheel 221 may be configured to rotate about the gearbox steering wheel shaft 222 or may be configured to rotate synchronously with the gearbox steering wheel shaft 222.

Generally, as a structure of the sub-transmission case, it is only required to be composed of the transmission case body 211, the transmission case steering wheel 221, and the transmission case steering wheel shaft 222. This construction, while simple and material-saving, does not have the ability to solve the problems described above.

Supporting frame

Can be used as another component installed in the box body and can be used as an installation component for installing the steering wheel.

As an example of the supporting frame, as shown in fig. 1A and 1B, a supporting frame 231 for a transmission case steering wheel is provided in the transmission case 211, and a side having the longest length extends from the inside of the transmission case 211 toward the transmission case opening 212.

The transmission case steering wheel is fixed in the transmission case body 211 by the supporting frame 231, and may be fixed (e.g., riveted, welded, etc.) without being detached, or may be detachably connected (e.g., screw, bolt, nut, etc.).

The portion of the transmission case steering wheel supporting frame 231 connected to the transmission case body 211 may be any portion of the transmission case body 211 surrounding the inner wall of the transmission case body cavity 213, and when the connection mode is detachable connection, in consideration of convenient detachment, in one example, as shown in fig. 1B, 1D, 1E, 1F, 1G, and 1H, a supporting frame mounting opening 214 is formed on a side of the transmission case body 211 corresponding to the transmission case opening 212. When mounted, the bracket connection screw 233 (a structure of the bracket connection member) is inserted into the mounting hole 214 and then is engaged with the mounting hole 234 for the transmission case on the bracket 231 for the transmission case steering wheel, so as to fix the bracket 231 for the transmission case steering wheel to the transmission case body 211.

As shown in fig. 1A, 1B, 1E, and 1F, only one portion of the transmission case steering wheel supporting frame 231 is connected to the transmission case 211, and the rest is not in contact with the transmission case 211. This can reduce the number of components to be disassembled and reduce the time required for disassembly when the transmission case steering wheel supporting frame 231 is detachably connected to the transmission case 211.

The material of the supporting frame 231 for the gearbox steering wheel may be engineering plastic, which may be possible for a rail transport apparatus in which the rail length is not very long and the load is not very heavy. However, in order to enhance the strength of the transmission case steering wheel supporting frame 231, the transmission case steering wheel supporting frame 231 may be made of steel.

As shown in fig. 1A, 1B, 1E, and 1F, an example of the supporting frame is that the length of the longest side of the supporting frame 231 for the gearbox turning wheel is longer than the length of the gearbox body 211, so that the longest side of the supporting frame 231 for the gearbox turning wheel can extend out of the opening 212 of the gearbox except one end of the longest side is provided in the gearbox body 211 as described above.

So that the portion of the transmission case steer wheel holder 231 extending from the transmission case opening 212 on the side of the longest length can also be used as a place where the transmission case steer wheel 221 is mounted. If so, when the transmission case steering wheel supporting frame 231 is detachably connected to the transmission case body 211, the transmission case steering wheel 22 can be attached to the portion of the transmission case steering wheel supporting frame 231 extending from the transmission case opening 212 on the longest side of the transmission case steering wheel supporting frame 231 without detaching the transmission case steering wheel supporting frame 231.

And when the guide rail conveying equipment is installed, one part of the extension part is installed in a guide rail cavity at one end of the guide rail, and the transmission case is installed at one end of the guide rail.

As shown in fig. 1A, 1B, 1E, and 1F, an example of the support frame is a U-shaped support frame 231 for a gearbox steering wheel.

The bottom of the supporting frame 231 for the steering wheel of the transmission case having the U-shaped structure is provided with a mounting opening 234 for the transmission case, and the mounting opening 234 for the transmission case is matched with the mounting opening 214 for the supporting frame provided on the transmission case body 211, so as to be used for mounting the supporting frame connecting screw 233 (a structure of the supporting frame connecting member).

The two sides of the U-shaped supporting frame 231 for the steering wheel of the transmission case are two longest sides of the supporting frame 231 for the steering wheel of the transmission case, and a mounting area 232 for the steering wheel of the transmission case for placing the steering wheel 221 of the transmission case is reserved between the longest sides of the length.

The longest sides of the support frame 231 for the gearbox steering wheel are respectively arranged at the axial front side and the axial rear side of the gearbox steering wheel 221 so as to provide more stable and firm support for the gearbox steering wheel 221. In this way, in operation, it is possible to reduce the amplitude of its oscillation in the axial direction.

The top outlet of the U-shaped gear box steering wheel supporting frame 231 is also disposed adjacent to the gear box opening 212, so that the gear box steering wheel mounting area 232 can be accessed through the top outlet near the gear box opening 212 when the gear box steering wheel 221 is mounted.

Position adjusting piece

Which is a component of the adjustment of the position of the diverting pulley, in particular in the direction of arrangement of the conveyor belt (one construction of the conveyor element, but also other constructions, such as steel wires, plastic ropes) with which it cooperates. This component is a new component relative to the usual gearbox. The additional components need to be provided in combination with the support frame described above.

As an example of the position adjusting member, as shown in fig. 1A, 1C, 1G, and 1H, the transmission case steering wheel position adjusting holes 241 are provided at intervals in the longitudinal direction of the transmission case steering wheel support frame on the side having the longest length. The position adjustment hole 241 for the gearbox steering wheel is used for arranging the gearbox steering wheel shaft 222, i.e. the gearbox steering wheel shaft 222 can be arranged in a form of being fastened in the position adjustment hole 241 for the gearbox steering wheel, or can be arranged not to keep close fit with the inner wall of the position adjustment hole 241 for the gearbox steering wheel, i.e. under the driving of an external transmission belt (one structure of a transmission member or other structures, such as a steel wire and a plastic rope), the gearbox steering wheel shaft 222 can possibly rotate independently in the position adjustment hole 241 for the gearbox steering wheel.

The position adjustment holes 241 for the gearbox turning wheels are provided on the longest side of the length of the support frame for the gearbox turning wheels, and a larger number of position adjustment holes 241 for the gearbox turning wheels can be provided, so that the gearbox turning wheels 221 can be provided with more positions for selection, thereby providing relatively many possibilities for adjusting the tightness required for the conveyor belt (one structure of the conveyor, but also other structures, such as steel wires, plastic ropes).

The size of the aperture of the position adjustment hole 241 for the transmission case steering wheel and the size of the pitch between the adjacent position adjustment holes 241 for the transmission case steering wheel are set to be related not only to the width and length of the longest side of the support frame for the transmission case steering wheel, but also to the radial size of the transmission case steering wheel shaft 222 on the transmission case steering wheel 221.

As shown in fig. 1A, 1B, 1E, and 1F, when the support frame 231 for the gearbox steering wheel has a U-shaped structure, a row of position adjustment holes 241 for the gearbox steering wheel having the same number are respectively provided on both sides of the U-shaped structure (i.e., on both sides of the support frame for the gearbox steering wheel having the longest length). One of the transmission case steering wheel position adjustment holes 241 in each row always has one-to-one correspondence with one of the transmission case steering wheel position adjustment holes 241 in the other row.

Thus, both ends of the transmission case steering wheel shaft 222 are respectively engaged with the pair of transmission case steering wheel position adjustment holes 241 in the two rows in one-to-one correspondence.

Thus, when the position of the transmission case steering wheel 221 needs to be changed, the transmission case steering wheel shaft 222 in the middle of the transmission case steering wheel 221 is only required to be arranged in the position adjusting holes 241 for the transmission case steering wheels of different pairs in the two rows.

In this way, the position of the transmission case steering wheel 221 can be changed by the position adjustment holes 241 for the transmission case steering wheel provided in the two rows without disassembling the transmission belt (one structure of the transmission member, but other structures such as a steel wire and a plastic rope) in a closed state.

As shown in fig. 1A, 1G, and 1H, when a portion of the longest side of the transmission case steering wheel support frame 231 extends outside the transmission case opening 212, a plurality of transmission case steering wheel position adjustment holes 241 are provided at intervals in this extending portion.

In one example of the transmission case of the present disclosure, a limiter is further included. The details are as follows.

Limiting piece

The device can be used for limiting the transverse movement position of the support frame in the box body. As an example of the stopper, as shown in fig. 1A and 1C, the stopper groove 251 for the steering wheel supporting frame is formed by enclosing a plate member provided in the transmission case 211, and when the transmission case 211 is made of engineering plastic, the transmission case 211 having the stopper groove 251 for the steering wheel supporting frame can be realized by an injection molding process.

As shown in fig. 1A and 1C, the guide rail slot and/or guide rail groove formed between the plate member disposed in the driving housing 211 and the inner wall of the driving housing 211 and enclosed in the limit groove 251 for the steering wheel supporting frame can be used for inserting or locking one end of the external guide rail.

In one example of the gear box of the present disclosure, a support for the support frame is further included. The details are as follows.

Support piece for support frame

It can be used in the condition that only one part of the supporting frame is fixedly connected with the box, and other parts are basically in a suspended state. As an example of the support for a support frame, as shown in fig. 1A and 1C, the support plate 261 for a steered wheel support frame supports the support frame 231 for a gearbox steered wheel. This also contributes to a reduction in the amplitude of its oscillation in the height direction during operation.

As an example of the support for a support frame, as shown in fig. 1A and 1C, one support plate 261 for a steered wheel support frame may be provided on each lateral side of the transmission case steered wheel support frame 231.

When the longest side of the length of the transmission case steering wheel supporting frame 231 extends from the inside of the transmission case body 211 to the transmission case opening 212, the direction of the installation of the steering wheel supporting frame supporting plate 261 is the same as the direction of the installation of the longest side of the length of the transmission case steering wheel supporting frame 231. The length of the supporting plate 261 for the steered wheel supporting frame is also substantially the same as the length of the longest side of the supporting plate 231 for the steered wheel of the transmission case.

When the limiting groove 251 for the steering wheel supporting frame is provided in the transmission case 211, the supporting plate 261 for the steering wheel supporting frame may be provided in the limiting groove 251 for the steering wheel supporting frame, so that the swing amplitude of the supporting plate 261 for the steering wheel supporting frame in the transverse direction and the height direction during operation can be reduced, and the effect of compact structure of the transmission case 211 can be achieved by such arrangement.

In the claims, the word "comprising" does not exclude other elements or steps; the word "a" or "an" does not exclude a plurality. In the claims, use of ordinal terms such as "first," "second," etc., to modify a claim element does not by itself connote any priority, order, or temporal order of execution of acts by one claim element over another, but rather is merely for distinguishing elements of one claim from elements of another. Although certain features may be separately described in mutually different dependent claims, this does not imply that these features cannot be used in combination. The various aspects of the utility model may be used alone, in combination, or in a variety of arrangements not specifically discussed in the embodiments described in the foregoing and is therefore not limited in its application to the details and arrangement of components set forth in the foregoing description or illustrated in the drawings. For example, aspects described in one embodiment may be combined with aspects described in other embodiments in any manner. The steps, functions, or features recited in the blocks or units may be performed or performed by one block or unit. The steps of the methods disclosed herein are not limited to being performed in any particular order, as may be possible when some or all of the steps are performed in other orders. Any reference signs in the claims shall not be construed as limiting the scope of the claims.

While the utility model has been described by way of drawings and embodiments, such description and illustration is to be considered illustrative or exemplary and not restrictive. Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the utility model as disclosed in the accompanying claims.

Claims

1. A transmission case for with outside along its longitudinal direction running through the guide rail cooperation of seting up the guide rail chamber, its characterized in that, the transmission case includes:

steering wheels of the transmission case;

2. A transmission case according to claim 1, wherein:

the supporting frame for the steering wheel of the transmission case is detachably connected with the transmission case;

3. The transmission case according to any one of claims 1 to 2, further comprising:

4. A transmission case according to claim 2, wherein:

the part of the supporting frame for the steering wheel of the transmission box, which is connected with the transmission box body, is positioned on one end extending along the length direction on one side of the supporting frame for the steering wheel of the transmission box, which has the longest length.

5. A transmission case according to claim 2, wherein:

and one part of the transmission case, which is connected with the support frame for the steering wheel of the transmission case, is positioned on one side of the transmission case opposite to the opening of the transmission case.

6. A gearbox according to any one of claims 1 to 2, characterised in that:

one part of the supporting frame for the steering wheel of the transmission box extends out of the opening of the transmission box, and when the transmission box is matched with the guide rail, one part of the supporting frame for the steering wheel of the transmission box extends out of the opening of the transmission box and extends into a guide rail cavity on the guide rail;

7. A gearbox according to any one of claims 1 to 2, characterised in that:

the support frame for the gearbox steering wheel is of a U-shaped structure, the bottom of the U-shaped structure is a part connected with the gearbox, two sides of the U-shaped structure are two sides with the longest length on the support frame for the gearbox steering wheel, a mounting area for the gearbox steering wheel for placing the gearbox steering wheel is reserved between the two sides with the longest length, the two sides of the U-shaped structure are respectively provided with position adjusting pieces for the gearbox steering wheel and are arranged in a one-to-one correspondence manner, and at least one pair of position adjusting parts for the gearbox steering wheel are matched with one gearbox steering wheel in all the gearbox steering wheels in the one-to-one correspondence manner.

8. The transmission case according to claim 7, wherein:

at least two pairs of position adjusting parts for steering wheels of the transmission case are arranged on two sides of the U-shaped structure in a one-to-one correspondence manner;

9. The transmission case according to any one of claims 1 to 2, further comprising:

10. The transmission case according to claim 9, wherein:

at least one supporting piece for the steering wheel supporting frame extends along the length direction of one side with the longest length on the supporting frame for the steering wheel of the transmission case, which corresponds to the supporting piece for the steering wheel supporting frame of the transmission case, so as to directly support one side with the longest length on the supporting frame for the steering wheel of the transmission case, which corresponds to the supporting piece for the steering wheel.