CN219101973U - Internal combustion bolt spanner reduction gearbox - Google Patents

Abstract

The utility model discloses an internal combustion bolt spanner reduction gearbox, and relates to the technical field of small road maintenance machinery. In the reduction gearbox, an input shaft and an output shaft are both rotationally connected to a box body, a transmission assembly and a clutch are arranged in the box body, the transmission assembly comprises a first transmission shaft, a sliding hole is formed in the first transmission shaft in an axial penetrating mode, and the output shaft is connected to the first transmission shaft in a transmission mode; the clutch comprises a control assembly, a fixed clutch structure fixed on the input shaft and a movable clutch structure connected with the sliding hole in an axially sliding manner, and the movable clutch structure is in transmission connection with the first transmission shaft; the control assembly is connected to the movable clutch structure and used for driving the movable clutch structure to axially move so as to enable the movable clutch structure to be connected with or separated from the fixed clutch structure. When the clutch is applied to a spanner, the clutch which is sequentially arranged with the reduction gearbox along the axial direction can be canceled, and the clutch is installed by utilizing the inner space of the first transmission shaft in the reduction gearbox, so that the axial length of the equipment can be shortened, and the equipment is compact.

Description

Internal combustion bolt spanner reduction gearbox

Technical Field

The utility model relates to the technical field of small road maintenance machinery, in particular to an internal combustion bolt spanner reduction gearbox.

Background

At present, the construction and maintenance of the railway sleeper fasteners in China mainly uses single-head and double-head bolt wrenches, and the transmission modes mainly comprise mechanical transmission, hydraulic transmission, electromagnetic transmission and the like, and have advantages and disadvantages in equipment technology, economy, use, maintenance and the like.

The existing internal combustion bolt spanner has the advantages that the output end of an engine is connected with a clutch, the clutch is connected with an input shaft of a reduction gearbox through a coupling, and the clutch, the coupling and the reduction gearbox are sequentially distributed along the axial direction, so that the internal combustion bolt spanner is large in axial length, poor in structural compactness, unfavorable for equipment miniaturization and limited in applicable scenes.

Therefore, how to improve the compactness of the device is a technical problem that needs to be solved by the person skilled in the art.

Disclosure of Invention

In view of the above, an object of the present utility model is to provide a reduction gearbox for an internal combustion bolt wrench, which is beneficial to achieving the compactness of the internal combustion bolt wrench.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

an internal combustion bolt spanner gearbox comprising: the transmission device comprises a box body, an input shaft, an output shaft, a transmission assembly and a clutch, wherein the input shaft and the output shaft are both rotationally connected to the box body, the transmission assembly and the clutch are arranged in the box body, the transmission assembly comprises a first transmission shaft, the first transmission shaft is axially penetrated and provided with a sliding hole, and the output shaft is in transmission connection with the first transmission shaft; the clutch comprises a control assembly, a fixed clutch structure fixed on the input shaft and a movable clutch structure connected with the sliding hole in an axially sliding manner, and the movable clutch structure is in transmission connection with the first transmission shaft; the control assembly is connected with the movable clutch structure and used for driving the movable clutch structure to axially move so as to enable the movable clutch structure to be connected with or separated from the fixed clutch structure.

Preferably, the control assembly comprises a clutch driving mechanism and a clutch elastic member; the clutch driving mechanism and the input shaft are respectively arranged at two ends of the first transmission shaft in the axial direction, and the clutch driving mechanism is used for driving the movable clutch structure to move along the axial direction and close to the fixed clutch structure so as to enable the movable clutch structure to be in contact with and connected with the fixed clutch structure, thereby enabling the input shaft to drive the first transmission shaft to rotate through the clutch; the clutch elastic piece is used for driving the movable clutch structure to move away from the fixed clutch structure along the axial direction so as to separate the movable clutch structure from the fixed clutch structure and cut off the connection between the input shaft and the first transmission shaft.

Preferably, the clutch is a friction clutch.

Preferably, the fixed clutch structure comprises a fixed clutch block, and the outer circumferential surface of the fixed clutch block is a conical fixed friction surface; the movable clutch structure comprises a movable clutch sleeve, the side surface of a groove of the movable clutch sleeve is a conical movable friction surface, and the movable friction surface is in contact and friction fit with the fixed friction surface to realize friction connection of the movable clutch structure and the fixed clutch structure.

Preferably, the movable clutch structure further comprises a movable clutch rod fixed at one end of the movable clutch sleeve, which is far away from the fixed clutch structure in the axial direction, the movable clutch sleeve is externally arranged at the sliding hole, and the movable clutch rod can be axially and slidably inserted into the sliding hole; the clutch is characterized in that an elastic piece groove which axially penetrates through the movable clutch sleeve and extends into the movable clutch rod is formed in the movable clutch structure, the clutch further comprises a supporting seat, the clutch elastic piece is arranged in the elastic piece groove, the supporting seat can be axially slidably inserted into the elastic piece groove, and the clutch elastic piece axially compresses the supporting seat to the fixed clutch structure.

Preferably, the fixed clutch block is axially close to the middle of one end face of the movable clutch structure, a mounting hole is formed in the middle of the end face of the movable clutch structure, a gasket is arranged in the mounting hole, and the clutch elastic piece axially presses the supporting seat on the gasket.

Preferably, the transmission assembly further comprises a second transmission shaft which is arranged in parallel with the first transmission shaft, a first gear is fixedly arranged on the second transmission shaft, a movable clutch gear is fixedly arranged on the movable clutch structure, the movable clutch gear is meshed and matched with the first gear, and the movable clutch gear can axially slide on the first gear; the movable clutch structure is rotatably connected to the sliding hole, and the second transmission shaft is in gear transmission with the first transmission shaft so as to drive the first transmission shaft through the second transmission shaft.

Preferably, the transmission assembly further comprises a gear shifting transmission structure, and the first transmission shaft is in transmission connection with the output shaft through the gear shifting transmission structure; the gear shifting transmission structure comprises a large output gear and a small input gear which are sequentially fixed outside the first transmission shaft along the axial direction; the gear shifting transmission structure further comprises a connecting sleeve fixed on the output shaft, the connecting sleeve can be axially and slidably connected with a duplex sliding gear, the connecting sleeve and the duplex sliding gear synchronously rotate along the circumferential direction, and the duplex sliding gear moves axially to be meshed with one of the large output gear and the small output gear.

Preferably, a duplicate gear is arranged on the first transmission shaft, one of two external gears of the duplicate gear is the large output gear, and the other external gear is in transmission connection with the second transmission shaft.

Preferably, the gear shifting control structure further comprises a gear shifting rod shaft parallel to the second transmission shaft and a shifting fork fixedly connected to the gear shifting rod shaft, the shifting fork is radially inserted into a groove on the duplex sliding gear, the gear shifting rod shaft is axially movably connected to the box body, and part of the gear shifting rod shaft extends out of the box body.

Preferably, the second transmission shaft and the output shaft are respectively inserted into the connecting sleeve from two ends of the connecting sleeve in the axial direction, and the second transmission shaft is rotatably connected with the connecting sleeve.

The utility model provides an internal combustion bolt spanner reduction gearbox, which comprises: the device comprises a box body, an input shaft, an output shaft, a transmission assembly and a clutch. The input shaft and the output shaft are both rotationally connected to the box body, the transmission assembly and the clutch are arranged in the box body, the transmission assembly comprises a first transmission shaft, the first transmission shaft is axially penetrated with a sliding hole, and the output shaft is in transmission connection with the first transmission shaft; the clutch comprises a control assembly, a fixed clutch structure fixed on the input shaft and a movable clutch structure connected with the sliding hole in an axially sliding manner, and the movable clutch structure is in transmission connection with the first transmission shaft; the control assembly is connected to the movable clutch structure and used for driving the movable clutch structure to axially move so as to enable the movable clutch structure to be connected with or separated from the fixed clutch structure.

When being applied to internal combustion bolt spanner, can cancel the clutch that sets gradually along the axial with the reducing gear box, and utilized the interior space installation clutch of the first transmission shaft in the reducing gear box, can shorten the axial length of equipment, be favorable to making equipment compactification, increase applicable scene.

Drawings

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

FIG. 1 is a cross-sectional view of a first embodiment of a reduction gearbox for an internal combustion bolt wrench provided by the utility model;

fig. 2 is a cross-sectional view of a fork portion of a first embodiment of a reduction gearbox for an internal combustion bolt wrench according to the present utility model.

Reference numerals:

the device comprises a box body 1, a first box body 11, a second box body 12 and a bearing flange 13;

an input shaft 2;

an output shaft 3;

the transmission assembly 4, the first transmission shaft 41, the large output gear 411, the small input gear 412, the sliding hole 413, the third gear 414, the second transmission shaft 42, the first gear 421, the second gear 422, the connecting sleeve 43, the duplex sliding gear 44 and the groove 441;

the clutch 5, the clutch driving mechanism 51, the elastic member 52, the fixed clutch structure 53, the fixed clutch block 531, the mounting hole 532, the clutch pad 533, the movable clutch structure 54, the movable clutch sleeve 541, the movable clutch lever 542, the movable clutch gear 543, the elastic member groove 544, and the supporting seat 55;

the gear shift control structure 6, a gear lever shaft 61, a shift fork 62, a gear lever sleeve 63, a steel ball 64, and a gear shift portion compression spring 65.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model aims at providing an internal combustion bolt spanner reduction gearbox which is beneficial to realizing the structural compactness of an internal combustion bolt spanner.

The embodiment I of the reduction gearbox of the internal combustion bolt spanner provided by the utility model can be particularly applied to a single-head internal combustion bolt spanner of a railway sleeper. Referring to fig. 1 and 2, the reduction gearbox includes: the device comprises a box body 1, an input shaft 2, an output shaft 3, a transmission assembly 4 and a clutch 5.

The case 1 is formed by connecting a first case 11 and a second case 12 which are arranged in sequence in the axial direction.

The input shaft 2 and the output shaft 3 are both rotatably connected to the box body 1 and extend out of the box body 1, and the transmission assembly 4 and the clutch 5 are arranged in the box body 1.

The transmission assembly 4 is used for power transmission between the input shaft 2 and the output shaft 3. The transmission assembly 4 comprises a first transmission shaft 41, a sliding hole 413 is formed in the first transmission shaft 41 in an axial penetrating mode, and the output shaft 3 is connected to the first transmission shaft 41 in a transmission mode.

The clutch 5 includes a control assembly, a fixed clutch structure 53 and a movable clutch structure 54. The fixed clutch structure 53 is fixed to the input shaft 2, and the fixed clutch structure and the input shaft can be connected through a spline. The movable clutch structure 54 is axially slidably connected to the sliding hole 413, and the movable clutch structure 54 is in driving connection with the first transmission shaft 41. The control assembly is connected to the movable clutch structure for driving the movable clutch structure 54 to axially move, so that the movable clutch structure 54 is connected to the fixed clutch structure 53, and the input shaft 2 can drive the first transmission shaft 41 to rotate through the clutch 5, or the movable clutch structure 54 is separated from the fixed clutch structure 53, so that the first transmission shaft 41 is not driven by the input shaft.

Specifically, in the present embodiment, the control assembly includes the clutch driving mechanism 51 and the clutch elastic member 52. The clutch driving mechanism 51 and the input shaft 2 are provided at both ends of the first transmission shaft 41 in the axial direction. The clutch elastic member 52 and the clutch driving mechanism 51 are both connected to the movable clutch structure 54.

The clutch driving mechanism 51 is used for driving the movable clutch structure 54 to move along the axial direction (leftwards in fig. 1) close to the fixed clutch structure 53, so that the movable clutch structure 54 is contacted and connected with the fixed clutch structure 53, and the input shaft 2 drives the first transmission shaft 41 to rotate through the clutch 5, and further drives the output shaft 3 through the first transmission shaft 41. Preferably, the clutch driving mechanism 51 is a hydraulic cylinder.

The clutch elastic member 52 is used for driving the movable clutch structure 54 to move away from the fixed clutch structure 53 (rightward in fig. 1) along the axial direction, so that the movable clutch structure 54 is separated from the fixed clutch structure 53, the connection between the input shaft 2 and the first transmission shaft 41 is cut off, and the input shaft 2 no longer transmits power to the transmission assembly 4 and the output shaft 3.

When the clutch is applied to a wrench, the engine inputs power to the input shaft 2, and the input shaft 2 can realize force transmission and disconnection between the input shaft 2 and the transmission assembly 4 through engagement and disengagement of the clutch 5.

In this embodiment, when applied to an internal combustion bolt spanner, the clutch 5 that sets gradually along the axial with the reducing gear box can be cancelled, and the clutch 5 is installed to the inner space that has utilized the first transmission shaft 41 in the reducing gear box, can shorten the axial length of equipment, is favorable to making equipment compactify, increases applicable scene.

Of course, in other embodiments, the control assembly may include two cylinders to drive the moving clutch structure 54 in opposite directions in the axial direction to effect connection or disconnection with the fixed clutch structure 53.

Further, the clutch 5 is a friction clutch, and the impact vibration is small. Of course, in other embodiments, a centrifugal clutch may also be employed for the clutch 5.

Further, the fixed clutch structure 53 includes a fixed clutch block 531, and the fixed clutch block 531 may be specifically sleeved on the input shaft 2. The outer circumferential surface of the fixed clutch block 531 is a tapered fixed friction surface. The movable clutch structure 54 comprises a movable clutch sleeve 541, and the side surface of a groove of the movable clutch sleeve 541 is a conical movable friction surface, and the movable friction surface is in contact and friction fit with the fixed friction surface to realize the friction connection of the movable clutch structure 54 and the fixed clutch structure 53. At this time, the clutch 5 is a conical clutch, and torque transmission is realized by the conical clutch, so that stable engagement can be ensured.

Further, the movable clutch structure 54 further includes a movable clutch lever 542 fixed to an end of the movable clutch housing 541 axially away from the fixed clutch structure 53. The movable clutch sleeve 541 is externally arranged in the sliding hole 413, and the movable clutch lever 542 is axially slidably inserted in the sliding hole 413. The movable clutch structure 54 is provided with an elastic member slot 544 extending axially through the movable clutch sleeve 541 and into the movable clutch lever 542, and the clutch 5 further includes a support seat 55, and the clutch elastic member 52 is embedded in the elastic member slot 544, specifically, the clutch elastic member 52 is a compression spring. The support seat 55 is axially slidably inserted in the elastic member slot 544, and the clutch elastic member 52 axially presses the support seat 55 against the fixed clutch structure 53. The clutch elastic member 52 is built in the movable clutch structure 54, so that the space utilization rate can be further improved.

In the clutch 5, the clutch elastic member 52 always presses the support seat 55 toward the spacer 533, and the support seat 55, as shown in fig. 1, makes the support seat 55 not change in position in the axial direction, and the clutch elastic member 52 presses the spacer 533 leftward and presses the clutch lever 542 rightward. During the gear-shifting process, the clutch driving mechanism 51 is reset rightward, so that the movable clutch structure 54 has a rightward movement space, and the clutch elastic member 52 pushes the movable clutch structure 54 rightward with the gasket 533 as a reference surface, so that the movable clutch structure 54 and the fixed clutch structure 53 are separated. During engagement, the clutch driving mechanism 51 overcomes the elasticity of the clutch elastic member 52 and drives the movable clutch structure 54 to move leftwards to contact the fixed clutch structure 53, so that power transmission between the input shaft 2 and the output shaft 3 is realized.

Preferably, a bearing is provided at one end of the support base 55 in the axial direction, through which bearing the support base 55 is pressed against the spacer 533, so that the pressing between the support base 55 and the spacer 533 does not affect the free rotation of the fixed clutch structure 53 and the input shaft 2 in the out-of-gear state.

Of course, in other embodiments, the clutch spring 52 may be located between the wall of the slide bore 413 and the outer surface of the dynamic clutch structure 54.

Further, the fixed clutch block 531 is axially close to the middle of the end surface of one end of the movable clutch structure 54, and a gasket 533 is disposed in the mounting hole 532, so that the clutch elastic member 52 axially presses the support seat 55 against the gasket 533, and the support seat 55 can be prevented from directly abutting against and wearing the input shaft 2. The spacer 533 may be detachably connected to the fixed clutch block 531, so as to be convenient for replacement.

Further, the transmission assembly further comprises a second transmission shaft 42 arranged in parallel with the first transmission shaft 41, and the first transmission shaft 41 and the second transmission shaft 42 are connected to the box 1 through bearings.

The second transmission shaft 42 is fixedly provided with a first gear 421, the movable clutch structure 54 is fixedly provided with a movable clutch gear 543, the movable clutch gear 543 is engaged with the first gear 421, and the movable clutch gear 543 can axially slide on the first gear 421. The clutch structure 54 is rotatably connected to the sliding hole 413, and the second transmission shaft 42 is geared with the first transmission shaft 41 to drive the first transmission shaft 41 through the second transmission shaft 42.

By providing the second transmission shaft 42 to transmit the torque between the clutch structure 54 and the first transmission shaft 41, the torque to be output can be ensured as needed. Meanwhile, the transmission assembly 4 can fully utilize the space in the radial direction in the box body 1 to carry out layout, and not only all shaft structures are sequentially distributed along the axial direction, as in the azimuth of fig. 1, the axial direction is the left-right direction, on the basis, the up-down direction is one radial direction, the first transmission shaft 41 and the second transmission shaft 42 are vertically arranged, and further the input shaft 2 and the output shaft 3 are vertically distributed, so that the layout is more reasonable. Of course, in other embodiments, the movable clutch structure 54 may be connected to the first transmission shaft 41 through a key, and the movable clutch structure 54 drives the first transmission shaft 41 to rotate through the key.

Further, the transmission assembly 4 further comprises a gear shifting transmission structure, through which the first transmission shaft 41 is in transmission connection with the output shaft 3. The shift transmission structure includes a large output gear 411 and a small input gear 412 fixed outside the first transmission shaft 41 in order in the axial direction. The gear shifting transmission structure further comprises a connecting sleeve 43 fixed on the output shaft 3, the connecting sleeve 43 is axially and slidably connected with a duplex sliding gear 44, and the connecting sleeve 43 and the duplex sliding gear 44 synchronously rotate along the circumferential direction. The duplex slipping gear 44 is axially moved to engage one of the large output gear 411 and the small output gear, thereby achieving output torque variation. Specifically, the connecting sleeve 43 is specifically a spline sleeve, the output shaft 3 is connected with the connecting sleeve 43 through a spline, and the duplex slipping gear 44 is connected with the connecting sleeve 43 through a spline.

Further, a duplicate gear is provided on the first transmission shaft 41, and the duplicate gear form a sleeved gear assembly. One of the two external gears of the double gear is a large output gear 411; the other is a third gear 414, which is in driving connection with the second transmission shaft 42, and specifically, is in meshed fit with a second gear 422 on the second transmission shaft 42, so as to facilitate assembly. Of course, in other embodiments, the duplex gear may be replaced with two gears that are separate.

Further, the internal combustion bolt spanner gearbox further comprises a gear shift control structure 6. The shift control structure 6 includes a shift lever shaft 61 parallel to the second transmission shaft 42, and a fork 62 fixedly coupled to the shift lever shaft 61. Specifically, the shift fork 62 is mounted at the end of the shift lever shaft 61 located in the case 1. The shift fork 62 is inserted into a groove 441 on the duplex sliding gear 44 in the radial direction, and the groove 441 may be a gear gap formed between two gears of the duplex sliding gear 44. The shift lever shaft 61 is axially movably connected to the casing 1, and a part of the structure of the shift lever shaft 61 protrudes from the casing 1. The change of torque output can be realized by adopting the shifting fork 62, specifically, the gear lever shaft 61 is manually pushed out in the box body 1 to realize the axial movement of the shifting fork 62, the large output gear 411 is switched, and the small input gear 412 is connected with the corresponding gear on the duplex sliding gear 44.

Further, the second transmission shaft 42 and the output shaft 3 are respectively inserted into the connecting sleeve 43 from two ends of the connecting sleeve 43 in the axial direction, which is beneficial to ensuring the collinearity of the axes of the two. Wherein the second drive shaft 42 is rotatably connected to the connection sleeve 43, in particular the second drive shaft 42 is rotatably connected to the connection sleeve 43 by means of a bearing.

The internal combustion bolt spanner reducing gear box that this embodiment provided, theory of operation: as shown in fig. 1, power is input through an input shaft 2, a clutch driving mechanism 51 is controlled to push a movable clutch structure 54 to be in contact with and rub against a fixed clutch structure 53, so that power transmission is realized, the movable clutch structure 54 drives a first gear 421 on a second transmission shaft 42 through a movable clutch gear 543 on the movable clutch structure 54 to drive the second transmission shaft 42 to rotate, a second gear 422 on the second transmission shaft 42 drives the first transmission shaft 41 to rotate through a third gear 414 on the first transmission shaft 41, the first transmission shaft 41 drives a duplex sliding gear 44 to rotate through a large output gear 411 on the first transmission shaft, and the duplex sliding gear 44 transmits power to the output shaft 3 through a connecting sleeve 43; when the gear lever shaft 61 is controlled to axially move, the shifting fork 62 drives the duplex sliding gear 44 to axially slide, so that the duplex sliding gear 44 and the small input gear 412 on the first transmission shaft 41 are realized, and large torque force is transmitted to the output shaft 3; when the clutch driving mechanism 51 is reset, the clutch elastic member 52 pushes the movable clutch structure 54 towards the inside of the sliding hole 413, the movable clutch structure 54 is separated from the fixed clutch structure 53, and the power transmission is stopped.

The internal combustion bolt spanner reduction gearbox provided by the utility model can realize smooth output of engine torque, and can realize stable output of torque through interaction among gears; the gear shifting mechanism can achieve the purpose of maximum torque output, and has the advantages of compactness, reasonable transmission layout, high working efficiency, easiness in operation, high reliability and long service life.

It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality", "a plurality of groups" is two or more.

The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The reduction gearbox for the internal combustion bolt spanner provided by the utility model is described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (10)

1. An internal combustion bolt spanner reducing gear box, characterized by comprising: the novel transmission device comprises a box body (1), an input shaft (2), an output shaft (3), a transmission assembly (4) and a clutch (5), wherein the input shaft (2) and the output shaft (3) are both rotationally connected to the box body (1), the transmission assembly (4) and the clutch (5) are arranged in the box body (1), the transmission assembly (4) comprises a first transmission shaft (41), the first transmission shaft (41) is axially penetrated and provided with a sliding hole (413), and the output shaft (3) is in transmission connection with the first transmission shaft (41);

the clutch (5) comprises a control assembly, a fixed clutch structure (53) fixed on the input shaft (2) and a movable clutch structure (54) which is axially and slidably connected with the sliding hole (413), and the movable clutch structure (54) is in transmission connection with the first transmission shaft (41);

the control assembly is connected to the movable clutch structure (54) and is used for driving the movable clutch structure (54) to axially move so that the movable clutch structure (54) is connected with or separated from the fixed clutch structure (53).

2. The internal combustion bolt spanner gearbox according to claim 1, wherein the control assembly comprises a clutch drive mechanism (51) and a clutch spring (52);

the clutch driving mechanism (51) and the input shaft (2) are respectively arranged at two ends of the first transmission shaft (41) in the axial direction, the clutch driving mechanism (51) is used for driving the movable clutch structure (54) to move along the axial direction and close to the fixed clutch structure (53) so as to enable the movable clutch structure (54) to be in contact with and connected with the fixed clutch structure (53), and therefore the input shaft (2) drives the first transmission shaft (41) to rotate through the clutch (5);

the clutch elastic piece (52) is used for driving the movable clutch structure (54) to move away from the fixed clutch structure (53) along the axial direction so as to separate the movable clutch structure (54) from the fixed clutch structure (53) and cut off the connection between the input shaft (2) and the first transmission shaft (41).

3. The internal combustion bolt spanner gearbox according to claim 2, characterized in that the clutch (5) is a friction clutch.

4. A reduction gearbox for internal combustion bolt wrenches according to claim 3, wherein the fixed clutch structure (53) comprises a fixed clutch block (531), and the outer circumferential surface of the fixed clutch block (531) is a conical fixed friction surface; the movable clutch structure (54) comprises a movable clutch sleeve (541), the side surface of a groove of the movable clutch sleeve (541) is a conical movable friction surface, and the movable friction surface is in contact with and friction fit with the fixed friction surface to realize friction connection of the movable clutch structure (54) and the fixed clutch structure (53).

5. The speed reduction box for internal combustion bolt wrenches according to claim 4, wherein the movable clutch structure (54) further comprises a movable clutch rod (542) fixed to one end of the movable clutch sleeve (541) axially away from the fixed clutch structure (53), the movable clutch sleeve (541) is externally arranged on the sliding hole (413), and the movable clutch rod (542) is axially slidably inserted into the sliding hole (413); the clutch is characterized in that an elastic piece groove (544) axially penetrating through the movable clutch sleeve (541) and extending into the movable clutch rod (542) is formed in the movable clutch structure (54), the clutch (5) further comprises a supporting seat (55), the clutch elastic piece (52) is arranged in the elastic piece groove (544), the supporting seat (55) can be axially slidably inserted into the elastic piece groove (544), and the clutch elastic piece (52) axially presses the supporting seat (55) to the fixed clutch structure (53).

6. The speed reduction box for internal combustion bolt wrenches according to claim 5, wherein the fixed clutch block (531) is axially provided with a mounting hole (532) near the middle of one end face of the movable clutch structure (54), a gasket (533) is provided in the mounting hole (532), and the clutch elastic member (52) axially presses the support seat (55) against the gasket (533).

7. The speed reduction box for internal combustion bolt wrenches according to any one of claims 1 to 6, characterized in that the transmission assembly further comprises a second transmission shaft (42) arranged in parallel with the first transmission shaft (41), a first gear (421) is fixedly arranged on the second transmission shaft (42), a movable clutch gear (543) is fixedly arranged on the movable clutch structure (54), the movable clutch gear (543) is in meshed fit with the first gear (421), and the movable clutch gear (543) is axially slidable on the first gear (421); the movable clutch structure (54) is rotatably connected to the sliding hole (413), and the second transmission shaft (42) is in gear transmission with the first transmission shaft (41) so as to drive the first transmission shaft (41) through the second transmission shaft (42).

8. The internal combustion bolt spanner gearbox according to claim 7, characterized in that said transmission assembly (4) further comprises a gear shifting transmission structure through which said first transmission shaft (41) is in transmission connection with said output shaft (3); the gear shifting transmission structure comprises a large output gear (411) and a small input gear (412) which are sequentially fixed outside the first transmission shaft (41) along the axial direction; the gear shifting transmission structure further comprises a connecting sleeve (43) fixed on the output shaft (3), the connecting sleeve (43) is axially slidably connected with a duplex sliding gear (44), the connecting sleeve (43) and the duplex sliding gear (44) synchronously rotate along the circumferential direction, and the duplex sliding gear (44) moves axially to be meshed with one of the large output gear (411) and the small input gear (412).

9. The reduction gearbox for internal combustion bolt wrenches according to claim 8, characterized in that a double gear is provided on the first transmission shaft (41), one of the two external gears of the double gear being the large output gear (411), the other being drivingly connected to the second transmission shaft (42).

10. The internal combustion bolt spanner gearbox according to claim 8, further comprising a shift control structure (6), said shift control structure (6) comprising a gear lever shaft (61) parallel to said second transmission shaft (42), and a fork (62) fixedly connected to said gear lever shaft (61), said fork (62) being radially inserted into a groove (441) on said duplex slipping gear (44), said gear lever shaft (61) being axially movably connected to said box (1), and a part of the structure of said gear lever shaft (61) protruding out of said box (1).

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