A pneumatically controlled tooth-type power take-off

Abstract

The present invention discloses a pneumatically controlled tooth-type power take-off, comprising a cylinder, an annular piston disposed within the cylinder, and an output flange; the outer ring wall of the piston and the inner side wall of the cylinder form an annular air cavity; when gas is pumped into the annular air cavity, the piston is pushed toward the rear end face of the cylinder; the space enclosed by the inner ring wall of the piston passes through the front and rear ends of the cylinder, forming an axial passage; the coupling gear sleeve is provided with an internal spline, and the motor input shaft and the output flange are both provided with external splines; the coupling gear sleeve is axially movably sleeved outside the output flange and meshes with the external splines of the output flange; the output flange is located at the front end of the axial passage, the coupling gear sleeve is located within the piston, is connected to the piston, and can rotate axially relative to the piston; when gas is pumped into the annular air cavity, the coupling gear sleeve moves to mesh with the external splines of the motor input shaft and the output flange at the same time. The present invention has the advantages of occupying a small space, being simple in structure, and being able to be directly connected to the motor input shaft to take off power.

Description

Technical Field

[0001] The present invention relates to the field of power take-offs, and in particular to a pneumatically controlled tooth-type power take-off. Background Art

[0002] Traditional power take-offs (PTOs) on vehicles are electrically controlled and pneumatically operated, requiring the transmission to engage a gear. To use the PTO, the driver switches it on and off from the cab. The transmission controller receives a neutral signal, shifting the transmission into neutral. Simultaneously, the PTO's cylinder pushes the PTO's piston into gear, allowing the PTO to engage. Shifting into a lower gear allows the PTO to begin operating.

[0003] Some new energy vehicles use a motor that drives the vehicle without a transmission. Therefore, if a power take-off (PTO) system is required, an additional motor must be installed, creating a dual-motor system. One motor provides vehicle power, while the other drives the PTO. This dual-motor drive system has low energy efficiency, and the installation of the motors driving the PTO load is complex. The PTO typically uses an external cylinder to engage a piston, which drives a shift fork and a gear sleeve to connect the power input shaft and the power output shaft. A stop element then controls the gear sleeve to the correct engagement position to ensure proper operation. The entire PTO is bulky, occupies a large space, and has a complex structure that is prone to failure. Summary of the Invention

[0004] To this end, it is necessary to provide a pneumatically controlled tooth-type power take-off to solve the problems in the existing technology that the power take-off is large in overall size, occupies a large space, has a complex structure and is prone to failure, and needs to be equipped with dual motors when used in new energy vehicles.

[0005] To achieve the above object, the inventor provides a pneumatically controlled tooth-type power take-off, comprising a cylinder, a piston, an output flange and a combined gear sleeve;

[0006] The piston is annular and is disposed within the cylinder body, with the outer wall of the piston and the inner wall of the cylinder body enclosing an annular air cavity; the annular air cavity is sealed, and when gas is pumped into the annular air cavity, the piston is pushed toward the rear end face of the cylinder body, and the volume of the annular air cavity increases; when the piston is pushed toward the front end face of the cylinder body and the gas is discharged from the annular air cavity, the volume of the annular air cavity decreases; the space enclosed by the inner wall of the piston passes through the front end face and the rear end face of the cylinder body, forming an axial passage;

[0007] The inner ring wall of the coupling gear sleeve is provided with internal splines, and the side walls of the motor input shaft and the output flange are both provided with external splines; the coupling gear sleeve is axially movably sleeved outside the output flange and meshes with the external splines of the output flange;

[0008] The rear port of the shaft channel is used to insert the motor input shaft; the output flange is located at the front port of the shaft channel, and the coupling gear sleeve is located in the piston and is connected to the piston, and can rotate axially relative to the piston; when gas is pumped into the annular air cavity, the coupling gear sleeve moves with the piston until the coupling gear sleeve is sleeved on the motor input shaft inserted into the shaft channel, and at the same time engages with the external splines of the motor input shaft and the external splines of the output flange, so that the output flange can rotate with the motor input shaft.

[0009] As a preferred structure of the present invention, the outer ring wall of the rear end of the piston protrudes outward to form a first annular protrusion, and the inner side wall of the front end of the cylinder body protrudes inward to form a second annular protrusion; the front end of the piston is sleeved with a first sealing ring, the front end of the piston is passed through the second annular protrusion, and the first sealing ring abuts against the inner ring wall of the second annular protrusion, the first annular protrusion is sleeved with a second sealing ring, and the second sealing ring abuts against the inner side wall of the rear end of the cylinder body to enclose the annular air cavity.

[0010] As a preferred structure of the present invention, it also includes a return elastic member, which is arranged between the piston and the rear end face of the cylinder body, and is elastically compressed when the piston is pushed to move toward the rear end face of the cylinder body, and elastically extends when the gas is discharged from the annular air cavity to push the piston toward the front end face of the cylinder body.

[0011] As a preferred structure of the present invention, the return elastic member is a spring.

[0012] As a preferred structure of the present invention, the combined gear sleeve is connected to the piston through a first bearing, the inner ring of the first bearing is connected to the combined gear sleeve, and the outer ring of the first bearing is connected to the piston.

[0013] As a preferred structure of the present invention, it further includes an annular front end cover, which is arranged at the front end port of the shaft channel to limit the piston from falling out; the output flange passes through the front end cover.

[0014] As a preferred structure of the present invention, it further includes a second bearing, which is arranged in the front end cover, with the outer ring of the second bearing connected to the front end cover, and the inner ring of the second bearing connected to the output flange.

[0015] As a preferred structure of the present invention, it also includes a proximity switch, which is arranged at the piston and is used to detect whether the piston has moved into place.

[0016] As a preferred structure of the present invention, the annular air cavity is provided with an air port for draining water, for allowing an air pump to pump gas into the annular air cavity, and for discharging gas from the annular air cavity.

[0017] As a preferred structure of the present invention, a bolt hole is provided on the outer wall of the cylinder body, and the axial direction of the bolt hole is consistent with the axial direction of the motor input shaft passing through the shaft channel; the bolt passes through the bolt hole and is screwed to the rear end cover of the motor to fix the cylinder body to the rear end cover of the motor.

[0018] Different from the existing technology, the air-controlled tooth-type power take-off described in the above technical solution has a built-in cylinder structure and adopts an annular inner cylinder structure. Therefore, during installation, it can be directly installed on the rear end face of the motor that drives the whole vehicle power of the new energy vehicle. The input shaft of the motor can be inserted into the shaft channel from the rear port of the shaft channel and face the output flange. When gas is pumped into the annular air cavity, the coupling gear sleeve will move with the piston and move toward the direction of the rear end face of the cylinder body until the coupling gear sleeve is sleeved on the external spline of the input shaft of the motor inserted into the shaft channel. The coupling gear sleeve is engaged with the external splines of the input shaft and the output flange of the motor at the same time, so that the output flange can rotate with the input shaft of the motor, and the air hole tooth-type power take-off realizes the power taking-off function. There is no need to configure an additional power take-off motor separately. Even if an additional power take-off motor is configured, a pneumatically controlled tooth-type power take-off can be installed to achieve power take-off. It is interchangeable and universal. The output flange can be connected to the input shaft of the motor without the need for an external cylinder. The overall structure is simple, small in size, easy to install, low in failure rate and low in maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a cross-sectional structural diagram of a pneumatically controlled tooth-type power take-off according to an embodiment of the present invention;

[0020] Figure 2 This is an end structural diagram of a pneumatically controlled tooth-type power take-off according to an embodiment of the present invention;

[0021] Figure 3 This is a diagram showing the usage status of a pneumatically controlled tooth-type power take-off according to an embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1. Cylinder body; 100. Annular air cavity; 101. Shaft passage; 102. Bolt hole; 103. Second annular protrusion;

[0024] 2. Piston; 200. First annular protrusion;

[0025] 3. Output flange;

[0026] 4. Combined gear sleeve; 400, internal spline;

[0027] 5. The first sealing ring;

[0028] 6. Second sealing ring;

[0029] 7. Return elastic part;

[0030] 8. First bearing;

[0031] 9. Front end cover;

[0032] 10. Second bearing;

[0033] 11. Proximity switch;

[0034] 12. Air outlet;

[0035] 13. Bolts;

[0036] 14. Motor; 1401. Input shaft; 14010. External spline; 1402. Rear end cover. DETAILED DESCRIPTION

[0037] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0038] The present invention provides a pneumatic tooth-type power take-off (PTO) for implementing a power take-off function. It is a transfer device that directly takes power from a motor 14. Compressed air controls the engagement and disengagement of a coupling sleeve 4 within the PTO and the input shaft 1401 of the motor 14, thereby controlling the operation and stopping of the PTO. For example, when installed in the power assembly of a sanitation vehicle, which requires a hydraulic pump to raise and lower the dump bucket when parked, the hydraulic pump can be connected to the output flange 3 of the PTO to drive the hydraulic pump to complete the bucket raising and lowering operation. In particular, the PTO of the present invention is interchangeable and versatile, with a simple overall structure and compact size, easy installation, low failure rate, and low maintenance costs.

[0039] See also Figure 1 and Figure 3 In a specific embodiment, the pneumatic tooth-type power take-off includes a cylinder body 1, a piston 2, and an output flange 3; the cylinder body 1 is the shell of the air hole tooth-type power take-off. Specifically, the cylinder body 1 is arranged in a horizontal columnar shape, one end face of the cylinder body 1 is the front face, and the other end face of the cylinder body 1 is the rear face. There is space inside it to accommodate the piston 2, the output flange 3 and the input shaft 1401 of the motor 14. When in use, the rear end face of the cylinder body 1 is opposite to the rear end cover 1402 of the motor 14; the piston 2 is used to drive the axial movement of the coupling gear sleeve 4 at the output flange 3 when gas is pumped into the cylinder body 1; the output flange 3 is a direct component connected to a mechanism that requires a power source. After the output flange 3 is connected to the input shaft 1401 of the motor 14, power can be taken from the motor 14 to drive the movement of the mechanism connected thereto.

[0040] The front end surface of the cylinder body 1 is provided with a cylinder port. During production and installation, the piston 2 is placed into the cylinder body 1 through the cylinder port. Therefore, the size of the cylinder port should not be smaller than the size of the piston 2.

[0041] The piston 2 is annular and is arranged in the cylinder body 1. The outer wall of the piston 2 and the inner wall of the cylinder body 1 form an annular air cavity 100. The annular air cavity 100 is sealed, and when gas is pumped into the annular air cavity 100, the piston 2 is pushed toward the rear end surface of the cylinder body 1, and the volume of the annular air cavity 100 increases. When the piston 2 is pushed toward the front end surface of the cylinder body 1 and the gas is discharged from the annular air cavity 100, the volume of the annular air cavity 100 decreases.

[0042] In order to set up a closed annular air cavity 100 with variable volume to push the piston 2 to move, in a certain embodiment, the inner side wall of the front end of the cylinder body 1 protrudes toward the axis and bends to form an annular groove, and the notch of the annular groove is opposite to the cylinder mouth of the cylinder body 1. The piston 2 is located between the notch of the annular groove and the rear end face of the cylinder body 1, and the front end of the piston 2 passes into the annular groove. The front end of the piston 2 and the annular groove form the annular air cavity 100, and space for the piston 2 to move is left between the rear end of the piston 2 and the rear end face of the cylinder body 1.

[0043] In another embodiment, the outer ring wall of the rear end of the piston 2 protrudes outward to form a first annular protrusion 200, and the inner wall of the front end of the cylinder body 1 protrudes inward to form a second annular protrusion 103; the front end of the piston 2 is sleeved with a first sealing ring 5, the front end of the piston 2 is passed through the second annular protrusion 103, and the first sealing ring 5 is against the inner ring wall of the second annular protrusion 103, the first annular protrusion 200 is sleeved with a second sealing ring 6, and the second sealing ring 6 is against the inner wall of the rear end of the cylinder body 1, so that the annular air cavity 100 can be enclosed.

[0044] In order to increase the movement stroke of the piston 2, in a further embodiment, the dimension of the second annular protrusion 103 along the axial direction (i.e., thickness) should be large enough, or the inner ring wall of the second annular protrusion 103 extends toward the cylinder port, so that when the gas in the annular air cavity 100 is completely discharged, the front end of the piston 2 will not extend beyond the cylinder port of the cylinder body 1, and when gas is pumped into the annular air cavity 100 and the coupling sleeve moves with the piston 2, until the coupling sleeve 4 is sleeved on the external spline 14010 of the input shaft 1401 of the motor 14 inserted into the shaft channel 101, the front end of the piston 2 is not separated from the first annular protrusion 200.

[0045] In a further embodiment, the first sealing ring 5 may be a Y-shaped sealing ring, and the second sealing ring 6 may also be a Y-shaped sealing ring.

[0046] After the air hole tooth type power take-off device completes the power take-off operation, in order to disconnect the power transmission, the gas in the annular air chamber 100 needs to be discharged. At the same time, it is necessary to apply thrust to the piston 2, causing the piston 2 to move away from the input shaft 1401 of the motor 14, thereby driving the coupling gear sleeve 4 to move and separate the coupling gear sleeve 4 from the external spline 14010 of the input shaft 1401 of the motor 14. In one embodiment, a return elastic member 7 is further included, which can be a spring. The return elastic member 7 is disposed between the piston 2 and the rear end surface of the cylinder body 1, and is elastically compressed when the piston 2 is pushed toward the rear end surface of the cylinder body 1. When the gas is discharged from the annular air chamber 100, the return elastic member 7 elastically extends to push the piston 2 toward the front end surface of the cylinder body 1. The return of the piston 2 is achieved by setting the return elastic member 7. When no gas is pumped into the annular air cavity 100, the output flange 3 is in a state of being separated from the input shaft 1401 of the motor 14, that is, the air hole tooth embedded type power take-off is of a normally separated type, that is, it is connected to the motor 14 only when power is needed. Although it is necessary to stop the vehicle to take power, the normally separated type can further reduce energy loss. The air hole tooth embedded type power take-off does not operate when power is not needed. It can be mainly used in heavy truck models such as dump trucks, sanitation trucks and special vehicles, etc.

[0047] The space enclosed by the inner wall of the piston 2 passes through the front and rear faces of the cylinder body 1, forming an axial passage 101. Since the front face of the cylinder body 1 has a cylinder port, the port serves as the front end of the axial passage 101. The input shaft 1401 of the power supply 14 passes through the rear end of the axial passage 101, while the output flange 3 passes through the front end of the axial passage 101. Specifically, the size of the axial passage 101 should be larger than the size of the portion of the output flange 3 that needs to be inserted into the axial passage 101. The inner ring wall of the coupling gear sleeve 4 is provided with an internal spline 400, and the side wall of the motor input shaft and the side wall of the output flange are both provided with an external spline 14010, and the external spline 14010 matches the internal spline 400; the coupling gear sleeve can be axially movably sleeved on the outside of the output flange and mesh with the external spline of the output flange; when the external spline 14010 of the input shaft 1401 of the motor 14 and the external spline of the output flange are simultaneously embedded in the internal spline 400 of the coupling gear, the output flange 3 can rotate coaxially with the input shaft 1401 of the motor 14.

[0048] The rear port of the shaft channel is used for the motor input shaft to pass through; the output flange 3 is axially rotatably provided at the front port of the shaft channel 101; the coupling sleeve is located in the piston and is connected to the piston and can rotate axially relative to the piston; when gas is pumped into the annular air cavity, the coupling sleeve moves with the piston until the coupling sleeve is sleeved on the motor input shaft that passes through the shaft channel, and at the same time engages with the external splines of the motor input shaft and the external splines of the output flange, so that the output flange can rotate with the motor input shaft. Since the coupling sleeve 4 can move axially relative to the output flange 3 while engaging with the external splines of the output flange, when the coupling sleeve 4 moves with the piston 2, the coupling sleeve 4 moves axially relative to the output flange. After the external splines of the motor input shaft engage with the internal splines of the coupling sleeve, when the coupling sleeve 4 rotates with the input shaft 1401 of the motor 14, the output flange 3 also rotates with the input shaft 1401 of the motor 14 to achieve power take-off. When gas is pumped into the annular air cavity 100, the output flange 3 moves with the piston 2 until the coupling sleeve 4 is sleeved on the external spline 14010 of the input shaft 1401 of the motor 14 inserted into the shaft channel 101, so that the output flange 3 can rotate with the input shaft 1401 of the motor 14, that is, the internal spline at one end of the coupling sleeve is engaged with the external spline of the output flange, and at the same time, the internal spline at the other end of the coupling sleeve is engaged with the external spline of the input shaft of the motor.

[0049] In order to realize the connection between the combined gear sleeve 4 and the piston 2, and the combined gear sleeve 4 can move with the piston 2 and can also rotate relative to the piston 2, in a certain embodiment, the combined gear sleeve 4 is connected to the piston 2 through a first bearing 8, the inner ring of the first bearing 8 is connected to the combined gear sleeve 4, and the outer ring of the first bearing 8 is connected to the piston 2, and the first bearing can be a deep groove ball bearing.

[0050] To improve the stability of the output flange 3, in a preferred embodiment, an annular front end cover 9 is further included. The front end cover 9 is disposed at the front end of the shaft passage 101 to prevent the piston 2 from dislodging. The output flange 3 passes through the front end cover 9. A second bearing 10 is also included. The second bearing 10 is disposed within the front end cover 9, with the outer ring of the second bearing 10 connected to the front end cover 9 and the inner ring of the second bearing 10 connected to the output flange 3. The output flange 3 can rotate with the coupling gear sleeve 4. The second bearing can be a deep groove ball bearing.

[0051] This pneumatically controlled tooth-type power take-off is equipped with a proximity switch 11, which is arranged at the piston 2 and is used to detect whether the piston 2 has moved into position, thereby realizing feedback control and making the control more precise. Through the feedback of the proximity switch 11, it can be ensured that the coupling gear sleeve 4 can complete the coupling action, and after the coupling is completed, the motor 14 can be started to drive the air hole tooth-type power take-off to perform the power taking operation.

[0052] Because this air hole tooth type power take-off adopts the internal cylinder technology, the compressed air entering must be dry. The moist compressed air will condense in the cylinder and cause water accumulation in the cylinder. Long-term operation will cause failure. Therefore, the liquid water formed by condensation must be released regularly. For this problem, please refer to Figure 1 and Figure 2 This air-hole tooth-type power take-off is designed with an air port 12. Specifically, the annular air cavity 100 is provided with an air port 12 for draining water, allowing the air pump to pump air into the annular air cavity 100, and for exhausting the air within the annular air cavity 100. To remove condensed water or other impurities from the air-hole tooth-type power take-off, simply open the air port 12, wait for the condensed water or other impurities to be removed, and then introduce compressed air to complete the cleaning process, thereby ensuring the operational stability of the air-hole tooth-type power take-off.

[0053] The air hole tooth-type power take-off needs to be installed at the rear end cover 1402 of the motor 14. To this end, in a further embodiment, a bolt hole 102 is opened on the outer wall of the cylinder body 1, and the axial direction of the bolt hole 102 is consistent with the axial direction of the input shaft 1401 of the motor 14 passing through the shaft channel 101; the bolt 13 passes through the bolt hole 102 and is screwed to the rear end cover 1402 of the motor 14 to fix the cylinder body 1 to the rear end cover 1402 of the motor 14.

[0054] The air hole tooth-embedded power take-off provided by the present invention has a built-in cylinder structure and adopts an annular inner cylinder structure. Therefore, during installation, it can be directly installed at the rear end face of the motor 14 that drives the entire vehicle power of the new energy vehicle. The input shaft 1401 of the motor 14 can be inserted into the shaft channel 101 from the rear port of the shaft channel 101, facing the output flange 3. When gas is pumped into the annular air cavity 100, the coupling gear sleeve will move with the piston 2 and move toward the direction of the rear end face of the cylinder body 1 until the coupling gear sleeve 4 is sleeved on the external spline 14010 of the input shaft 1401 of the motor 14 inserted into the shaft channel 101. The coupling gear sleeve is engaged with the external splines of the input shaft and the output flange of the motor at the same time, so that the output flange 3 can rotate with the input shaft 1401 of the motor 14, and the air hole tooth-embedded power take-off realizes the power taking-off function. There is no need to separately configure an additional power take-off motor 14. Even if an additional power take-off motor 14 is configured, an air-controlled tooth-type power take-off can be installed to achieve power take-off. It is interchangeable and universal. No external cylinder is required to connect the output flange 3 with the input shaft 1401 of the motor 14. The overall structure is simple, small in size, easy to install, low in failure rate, and low in maintenance cost.

[0055] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present invention. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described herein, or equivalent structural or equivalent process transformations made using the contents of the present invention's specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields, are all included in the scope of patent protection of the present invention.

Claims

1. A pneumatically controlled tooth-type power take-off, characterized in that: It includes a cylinder body, a piston, an output flange and a combined gear sleeve; The piston is annular and is disposed within the cylinder body, with the outer wall of the piston and the inner wall of the cylinder body enclosing an annular air cavity; the annular air cavity is sealed, and when gas is pumped into the annular air cavity, the piston is pushed toward the rear end face of the cylinder body, and the volume of the annular air cavity increases; when the piston is pushed toward the front end face of the cylinder body and the gas is discharged from the annular air cavity, the volume of the annular air cavity decreases; the space enclosed by the inner wall of the piston passes through the front end face and the rear end face of the cylinder body, forming an axial passage; The inner ring wall of the coupling gear sleeve is provided with internal splines, and the side walls of the motor input shaft and the output flange are both provided with external splines; the coupling gear sleeve is axially movably sleeved outside the output flange and meshes with the external splines of the output flange; The rear port of the shaft channel is used for the input shaft of the power supply machine to penetrate; The output flange is located at the front end of the shaft channel, and the coupling sleeve is located in the piston and is connected to the piston, and can rotate axially relative to the piston; when gas is pumped into the annular air cavity, the coupling sleeve moves with the piston until the coupling sleeve is sleeved on the motor input shaft inserted into the shaft channel, and at the same time engages with the external splines of the motor input shaft and the external splines of the output flange, so that the output flange can rotate with the motor input shaft.

2. The pneumatically controlled tooth-type power take-off according to claim 1, characterized in that: The outer ring wall of the rear end of the piston protrudes outward to form a first annular protrusion, and the inner side wall of the front end of the cylinder body protrudes inward to form a second annular protrusion; the front end of the piston is sleeved with a first sealing ring, the front end of the piston is passed through the second annular protrusion, and the first sealing ring abuts against the inner ring wall of the second annular protrusion, the first annular protrusion is sleeved with a second sealing ring, and the second sealing ring abuts against the inner side wall of the rear end of the cylinder body to enclose the annular air cavity.

3. The pneumatically controlled tooth-type power take-off according to claim 1, characterized in that: It also includes a return elastic member, which is arranged between the piston and the rear end face of the cylinder body, and is elastically compressed when the piston is pushed to move toward the rear end face of the cylinder body, and elastically extends when the gas is discharged from the annular air cavity to push the piston toward the front end face of the cylinder body.

4. The pneumatically controlled tooth-type power take-off according to claim 3, characterized in that: The return elastic member is a spring.

5. The pneumatically controlled tooth-type power take-off according to claim 1, characterized in that: The combined gear sleeve is connected to the piston through a first bearing, the inner ring of the first bearing is connected to the combined gear sleeve, and the outer ring of the first bearing is connected to the piston.

6. The pneumatically controlled tooth-type power take-off according to claim 1, characterized in that: The utility model also comprises an annular front end cover, which is arranged at the front end port of the shaft channel to limit the piston from falling out; the output flange passes through the front end cover.

7. The pneumatically controlled tooth-type power take-off according to claim 6, characterized in that: It also includes a second bearing, which is arranged in the front end cover, with an outer ring of the second bearing connected to the front end cover, and an inner ring of the second bearing connected to the output flange.

8. The pneumatically controlled tooth-type power take-off according to claim 1, characterized in that: The utility model also comprises a proximity switch, which is arranged at the piston and is used to detect whether the piston has moved into position.

9. The pneumatically controlled tooth-type power take-off according to claim 1, characterized in that: The annular air cavity is provided with an air port for draining water, supplying air to the annular air cavity through an air pump, and discharging air from the annular air cavity.

10. The pneumatically controlled tooth-type power take-off according to claim 1, characterized in that: A bolt hole is provided on the outer wall of the cylinder body, and the axial direction of the bolt hole is consistent with the axial direction of the motor input shaft passing through the shaft channel; the bolt passes through the bolt hole and is screwed to the rear end cover of the motor to fix the cylinder body to the rear end cover of the motor.

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