Friction type power takeoff

Abstract

The utility model provides a friction type power takeoff, which relates to the field of power takeoff, and adopts the technical scheme that the friction type power takeoff comprises a box body, an output shaft is rotatably arranged in the box body, a transmission gear is rotatably arranged on the output shaft, a brake gear ring is further arranged on the output shaft, a clutch mechanism is arranged between the output shaft and the transmission gear, and the clutch mechanism comprises a piston. The piston is arranged on the output shaft in an axial moving mode, the piston and the brake gear ring are coaxially arranged, the piston is connected with a brake pressing disc, the brake pressing disc can move axially, a brake disc is arranged between the brake pressing disc and the brake gear ring, the brake disc can move axially under the action of the brake pressing disc until the brake disc abuts against the brake gear ring, and a limiting piece is arranged on the brake disc. The limiting piece can abut against the box body. According to the power takeoff, the output shaft can be braked after the power takeoff is out of gear, and the influence of continuous output of power on a rear connecting mechanism is avoided.

Description

Technical Field

[0001] The utility model relates to the field of power take-offs, in particular to a friction type power take-off. Background Art

[0002] A power take-off is a group or more groups of speed gears, also known as a power output device. It is generally composed of a gearbox, a speed gear set, and a gear shifting mechanism. A friction power take-off is generally composed of a gearbox, a clutch, and a control mechanism. It is connected to the engine flywheel, the front housing of the gearbox, the low-speed gear of the gearbox, or the output shaft of the auxiliary box. The output flange outputs power to an external working device, such as a lifting pump.

[0003] The prior art discloses a power take-off, comprising a shell with a hollow interior, an output shaft, an input gear, an output gear, a piston and a return spring, wherein a clutch mechanism is provided between the output shaft and the output gear, the piston and the return spring are both sleeved on the output shaft, and the piston has a tendency to move away from the clutch mechanism under the elastic force of the return spring, the shell also has an air inlet, the output shaft has an air inlet passage connected to the air inlet, when gas enters the air inlet passage, the piston can overcome the elastic force of the return spring and press against the clutch mechanism, the clutch mechanism can form a linkage between the output shaft and the output gear after being squeezed by the piston; the input gear can drive the output gear to rotate stably under the action of an external force, the clutch mechanism comprises an inner friction plate and an outer friction plate in an annular shape, the inner friction plate is sleeved on the output shaft, the outer friction plate is located on the inner side of the output gear, and the inner friction plate presses against the outer friction plate. When the clutch mechanism is in a disconnected state, the output gear will not drive the output shaft to rotate during its rotation. Conversely, when the clutch mechanism is in a connected state, the output gear will drive the output shaft to rotate during its rotation.

[0004] With the above technical solution, since the inner friction plate and the outer friction plate are gradually in contact, the gear shifting process can be carried out directly. Compared with ordinary gear shifting, it does not have a pause action, and the gear shifting is smooth and stable. However, in the above technical solution, due to the inertia of the output shaft, when the clutch mechanism just changes from the connected state to the disconnected state, the output shaft is still in a rotating state, and the power take-off is still outputting power, which affects the rear connection mechanism. Utility Model Content

[0005] In order to solve the technical problem in the above-mentioned prior art that the output shaft of the power take-off continues to rotate due to inertia after the gear is disengaged, the utility model provides a friction power take-off, which can brake the output shaft after the power take-off is disengaged to avoid the continuous power output affecting the rear connection mechanism.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a friction power take-off, including a housing, an output shaft is rotatably arranged in the housing, a transmission gear is rotatably arranged on the output shaft, a brake gear ring is also arranged on the output shaft, a clutch mechanism is arranged between the output shaft and the transmission gear, the clutch mechanism includes a piston, the piston is axially movably arranged on the output shaft, the piston is coaxially arranged with the brake gear ring, the piston is connected with a brake pressure disc, the brake pressure disc is axially movable, a brake disc is arranged between the brake pressure disc and the brake gear ring, the brake disc can move axially under the action of the brake pressure disc until it abuts against the brake gear ring, a limiter is arranged on the brake disc, and the limiter can abut against the housing to limit the rotation of the brake disc. Through the cooperation of the brake pressure disc, the brake disc and the brake gear ring, the brake disc can brake the output shaft after the clutch mechanism is disconnected, so as to avoid the continuous output of power affecting the rear connection mechanism.

[0007] Furthermore, the brake pressure disc is axially movably arranged on the transmission sleeve of the transmission gear, and a mounting hole is arranged on the brake pressure disc, and the mounting hole is a stepped hole, and the axial direction of the mounting hole is parallel to the axial direction of the output shaft, and a positioning bolt is relatively movably arranged in the mounting hole, and the positioning bolt extends out of the mounting hole and is connected to the brake gear ring, and the clutch mechanism also includes a return spring, and the return spring is sleeved on the positioning bolt, and the two ends of the return spring are respectively in contact with the head of the positioning bolt and the step of the mounting hole. By arranging the return spring of the clutch mechanism on the brake pressure disc, it is possible to achieve uniform force on the brake pressure disc, ensure that the brake pressure disc is uniformly stressed and moves smoothly, and achieve uniform force on the brake disc, ensuring smooth braking.

[0008] Furthermore, the brake disc is axially movable on the mounting boss of the brake pressure disc, the brake pressure disc and the brake gear ring are both provided with flanges, and the brake disc is arranged between the two flanges. The contact area with the brake disc is increased by providing the flange, thereby ensuring smooth and rapid braking.

[0009] Furthermore, the brake disc is in clearance with the mounting boss, the stopper is a block structure, the stopper is arranged on the circumferential surface of the brake disc, two stoppers are arranged at corresponding positions of the box, the stopper is located between the two stoppers and can abut against one of the stoppers. By making the brake disc and the mounting boss in clearance and arranging the stopper on the circumferential surface, it is ensured that the brake disc can only move axially but not rotate, thereby ensuring effective braking.

[0010] Furthermore, the brake gear ring is provided with a cavity, the piston can move inside the cavity, the inner hole of the piston is in clearance with the transmission sleeve of the transmission gear, an oil cavity is provided between the piston and the cavity, a transition oil passage is provided on the top end face of the piston, and the oil cavity and the control oil hole of the output shaft are both in communication with the transition oil passage. By making the piston and the transmission sleeve in clearance, the movement accuracy of the piston is ensured, and at the same time, the piston is arranged in the cavity inside the brake gear ring to form an oil cavity, so as to ensure that the overall structure is compact and occupies little space.

[0011] Furthermore, a driving boss is provided inside the piston, and an overflow hole is provided on the driving boss, the overflow hole is connected to the transition oil passage, the diameter of the overflow hole is smaller than the diameter of the control oil hole, and a connected oil return hole and lubricating oil hole are also provided on the output shaft, the lubricating oil hole is provided at the location of the transmission gear, and the overflow hole is connected to the oil return hole through the clutch mechanism. The transmission gear is lubricated through the overflow hole, the oil return hole and the lubricating oil hole, and the fluidity of the oil is increased through the oil return hole to prevent excessive oil pressure and prevent impurities in the oil from causing component wear.

[0012] Furthermore, the clutch mechanism also includes a plurality of clutch friction plates and dual steel plates arranged alternately, a gap is provided between adjacent clutch friction plates and dual steel plates, the clutch friction plates are connected to the transmission sleeve, the dual steel plates are connected to the output shaft, and a clutch end plate is also provided on the output shaft, the clutch end plate can be pressed against the adjacent clutch friction plates, and the driving boss can abut against the adjacent dual steel plates.

[0013] Furthermore, the output shaft is provided with an external gear, the external gear and the output shaft are an integrated structure, the brake gear ring is provided with a connecting boss, the connecting boss is provided with an internal gear, and the internal gear meshes with the external gear. Through the meshing transmission of the internal and external gears, the friction torque generated by the brake disc and the brake gear is transmitted, and it is easy to disassemble and maintain.

[0014] Furthermore, a first bearing and a second bearing are provided on the output shaft, the first bearing is close to the transmission gear, and the second bearing is close to the external gear. A third retaining ring and a limit ring are also provided on the output shaft, the third retaining ring is arranged between the second bearing and the connecting boss, and the limit ring is arranged between the second bearing and the transmission flange, the transmission flange extends to the outside of the housing, and the transmission flange is detachably connected to one end of the output shaft extending out of the housing.

[0015] Furthermore, an oil seal is provided between the transmission flange and the housing to prevent dust and leakage, thereby reducing the entry of foreign dust and other impurities into the housing.

[0016] It can be seen from the above technical solutions that the utility model has the following advantages:

[0017] The utility model provides a friction type power take-off, which can realize braking of the output shaft after the live clutch mechanism is disconnected through the cooperation of the brake pressure plate, the brake disc and the brake gear ring, so as to avoid the continuous power output affecting the rear connection mechanism; by arranging the return spring of the clutch mechanism on the brake pressure plate, it can realize uniform force application on the brake pressure plate, so as to ensure that the brake pressure plate is uniformly stressed and moves smoothly; by arranging the flange, the contact area with the brake disc is increased, so as to ensure smooth and rapid braking; by matching the clearance between the brake disc and the mounting boss and arranging the limiter on the circumferential surface, it is ensured that the brake disc can only move axially but not in the axial direction. Rotation ensures effective braking; the piston movement accuracy is ensured by matching the clearance between the piston and the transmission sleeve, and the piston is set in the internal cavity of the brake gear ring to form an oil chamber to ensure that the overall structure is compact and occupies a small space; the transmission gear is lubricated through the overflow hole, the oil return hole and the lubricating oil hole, and the fluidity of the oil is increased through the oil return hole to prevent excessive oil pressure and avoid impurities in the oil from causing component wear; the friction torque generated by the brake disc and the brake gear is transmitted through the meshing transmission of internal and external gears, and it is easy to disassemble and maintain; dust and leakage are prevented by the oil seal to reduce the entry of external dust and other impurities into the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a specific implementation method of the utility model.

[0020] Figure 2 This is a schematic diagram of the structure of the utility model after removing the box body. Figure 1 .

[0021] Figure 3 This is a schematic diagram of the structure of the utility model after removing the box body. Figure 2 .

[0022] Figure 4 It is a schematic diagram of the structure of the output shaft in a specific implementation manner of the utility model.

[0023] Figure 5 The figure is a schematic diagram of the structure of the transmission gear in the specific implementation manner of the utility model.

[0024] Figure 6It is a structural schematic diagram of the clutch mechanism in a specific implementation manner of the utility model.

[0025] Figure 7 It is a schematic structural diagram of a brake pressure disc in a specific implementation manner of the utility model.

[0026] Figure 8 It is a schematic diagram of the structure of the brake disc in a specific implementation manner of the utility model.

[0027] Fig. 9 The figure is a schematic diagram of the structure of the piston in a specific implementation manner of the utility model.

[0028] Fig.10 The structure of the brake gear ring in the specific implementation mode of the utility model is shown in FIG.

[0029] In the figure, 1, housing; 2, output shaft; 201, external gear; 3, first bearing; 4, first retaining spring; 5, second retaining spring; 6, first retaining ring; 7, needle bearing; 8, second retaining ring; 9, third retaining spring; 10, transmission gear; 1001, transmission sleeve; 11, clutch end plate; 12, clutch friction plate; 13, dual steel plate; 14, connecting bolt; 15, positioning bolt; 16, brake pressure plate; 1601, mounting boss; 1602, mounting hole; 17, limit block , 18, return spring; 19, brake disc; 1901, limiter; 20, brake gear ring; 2001, internal gear; 22, piston; 2201, drive boss; 23, O-ring; 26, second bearing; 27, limit ring; 28, oil seal; 29, transmission flange; 30, end cover; 31, mounting bolt; 32, lubricating oil hole; 33, overflow hole; 34, transition oil channel; 35, third retaining ring; 36, control oil hole; 37, oil return hole; 38, oil chamber. DETAILED DESCRIPTION

[0030] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0031] like Figures 1 to 3As shown, this specific embodiment provides a friction power take-off, including a housing 1, an output shaft 2, a transmission gear 10, a clutch mechanism, a brake pressure disc 16, a brake disc 19 and a brake gear ring 20; the output shaft 2 is rotatably arranged in the housing 1 through a first bearing 3 and a second bearing 26 arranged at both ends, and the transmission gear 10 is rotatably arranged on the output shaft 2 through a needle bearing 7, and a second retaining spring 5 and a first retaining ring 6 are respectively arranged at both ends of the needle bearing 7 to achieve left-side limit, and a third retaining spring 9 and a second retaining ring 8 are respectively arranged to achieve right-side limit, and a transmission sleeve 1001 is arranged at one end of the transmission gear 10 for guiding the movement of the brake pressure disc 16 and the piston 22; a brake sleeve 1001 is also arranged on the output shaft 2 The movable gear ring 20 and the brake gear ring 20 can rotate together with the output shaft 2. A clutch mechanism is arranged between the output shaft 2 and the transmission gear 10. The clutch mechanism includes a piston 22. The piston 22 is axially movable on the output shaft 2. The piston 22 is coaxially arranged with the brake gear ring 20. The piston 22 is connected to the brake pressure disc 16 through the connecting bolt 14. The brake pressure disc 16 can move axially under the drive of the piston 22. A brake disc 19 is arranged between the brake pressure disc 16 and the brake gear ring 20. The brake disc 19 can move axially under the action of the brake pressure disc 16 until it abuts against the brake gear ring 20. A limit member 1901 is arranged on the brake disc 19, and the limit member 1901 can abut against the limit block 17 of the box body 1. Through the cooperation of the brake pressure disc 16, the brake disc 19 and the brake gear ring 20, the output shaft 2 can be braked after the clutch mechanism is disconnected, so as to avoid the continuous power output from affecting the rear connection mechanism.

[0032] like Figures 1 to 3 and Figure 7As shown, in order to ensure that the brake pressure disc 16 is subjected to balanced force and avoid skewing during movement due to uneven force, in this specific embodiment, the brake pressure disc 16 is axially movably arranged on the transmission sleeve 1001 of the transmission gear 10, and the inner hole of the brake pressure disc 16 is clearance-matched with the transmission sleeve 1001. The brake pressure disc 16 is provided with a mounting hole 1602, and the mounting hole 1602 is a stepped hole. The axial direction of the mounting hole 1602 is parallel to the axial direction of the output shaft 2. A positioning bolt 15 is relatively movably arranged in the mounting hole 1602, and the positioning bolt 15 extends out of the mounting hole 1602 and is connected to the brake gear ring 20. The clutch mechanism also includes a return spring 18, and the return spring 18 sleeve Arranged on the positioning bolt 15, the two ends of the return spring 18 are respectively in contact with the head of the positioning bolt 15 and the steps of the mounting hole 1602; by arranging the return spring 18 of the clutch mechanism on the brake pressure disc 16, it is possible to achieve uniform force on the brake pressure disc 16, ensuring that the brake pressure disc 16 is uniformly forced and moves smoothly, thereby achieving uniform force on the brake disc 19 and ensuring smooth braking; the brake disc 19 is axially movably arranged on the mounting boss 1601 of the brake pressure disc 16, and in order to increase the action area of ​​the brake pressure disc 16 and the brake gear ring 20 on the brake disc 19, the brake pressure disc 16 and the brake gear ring 20 are both provided with flanges, and the brake disc 19 is arranged between the two flanges.

[0033] like Figure 1 , Figure 2 and Figure 8 As shown, in this specific embodiment, in order to ensure that the brake disc 19 can only achieve axial movement, the limit member 1901 is a block structure, and the limit member 1901 is arranged on the circumferential surface of the brake disc 19. Two limit blocks 17 are arranged at corresponding positions of the box body 1, and the limit member 1901 is located between the two limit blocks 17 and can abut against one of the limit blocks 17; by making the brake disc 19 and the mounting boss 1601 fit in clearance and setting the limit member 1901 on the circumferential surface, it is ensured that the brake disc 19 can only move axially but not rotate, thereby ensuring effective braking; in order to ensure the movement accuracy of the brake disc 19, the inner hole of the brake disc 19 and the mounting boss 1601 fit in clearance.

[0034] like Figure 1 and Figure 3As shown, in order to ensure the accuracy of the reciprocating movement of the piston 22 and make the overall structure compact, and avoid increasing the occupied space of the power take-off due to the addition of a braking structure, in this specific embodiment, the brake gear ring 20 is provided with a cavity, the piston 22 can move inside the cavity, the outer circumferential surface of the piston 22 is clearance-matched with the inner wall of the cavity, the inner hole of the piston 22 is clearance-matched with the transmission sleeve 1001 of the transmission gear 10, an oil chamber 38 is provided between the top end face of the piston 22 and the cavity, and a transition oil channel 34 is provided on the top end face of the piston 22. The oil chamber 38 and the control oil hole 36 of the output shaft 2 are both connected to the transition oil channel 34. The control oil hole 36 can be connected to the oil pump to input high-pressure oil to push the piston 22 to move; by clearance-matching the piston 22 and the transmission sleeve 1001, the movement accuracy of the piston 22 is ensured, and at the same time, the piston 22 is arranged in the internal cavity of the brake gear ring 20 to form the oil chamber 38, and the overall structure is ensured. The structure is compact and occupies a small space. In order to achieve lubrication and ensure the smooth operation of the power take-off, a driving boss 2201 is arranged inside the piston 22. The driving boss 2201 is provided with an overflow hole 33. The overflow hole 33 is connected to the transition oil channel 34. The diameter of the overflow hole 33 is smaller than the diameter of the control oil hole 36. A connected return oil hole 37 and a lubricating oil hole 32 are also arranged on the output shaft 2. The lubricating oil hole 32 is arranged at the position where the transmission gear 10 is located. The overflow hole 33 is connected to the return oil hole 37 through a clutch mechanism. The transmission gear 10 is lubricated through the overflow hole 33, the return oil hole 37 and the lubricating oil hole 32, and the fluidity of the oil is increased through the return oil hole 37 to prevent the oil pressure from being too high and to prevent the impurities in the oil from causing the wear of the parts. Since the input oil pressure of the oil pump is very high, in order to avoid the oil pressure being too high, an overflow hole connected to the cavity is also arranged on the brake gear ring 20, and the diameter of the overflow hole is smaller than the diameter of the control oil hole 36.

[0035] like Figure 1 , Figure 3 and Figure 6As shown, in this specific embodiment, the clutch mechanism can adopt the following specific structure: the clutch mechanism also includes a plurality of clutch friction plates 12 and dual steel plates 13 arranged alternately, gaps are provided between adjacent clutch friction plates 12 and dual steel plates 13, the clutch friction plates 12 are connected to the transmission sleeve 1001, the dual steel plates 13 are connected to the output shaft 2, and a clutch end plate 11 is also provided on the output shaft 2, the clutch end plate 11 can be pressed against the adjacent clutch friction plates 12, and the driving boss 2201 can be in contact with the adjacent dual steel plates 13 ; In this specific embodiment, the inner wall of the transmission sleeve 1001 is provided with an internal spline, and the corresponding position on the output shaft 2 is provided with an external spline, the clutch friction plate 12 is connected to the transmission sleeve 1001 through the internal spline, and the dual steel plate 13 is connected to the output shaft 2 through the external spline; when the driving boss 2201 of the piston 22 continuously squeezes the dual steel plate 13, the adjacent dual steel plates 13 and clutch friction plates 12 are continuously elastically deformed and pressed, so that the power of the transmission gear 10 is transmitted to the output shaft 2 through the clutch mechanism, thereby realizing the power transmission of the power take-off.

[0036] like Figure 4 and Fig.10 As shown, in order to ensure reliable connection between the transmission gear 10 and the output shaft 2, in this specific embodiment, an external gear 201 is provided on the output shaft 2, and the external gear 201 and the output shaft 2 are an integrated structure, and the brake gear ring 20 is provided with a connecting boss, and the connecting boss is provided with an internal gear 2001, and the internal gear 2001 is meshed with the external gear 201. Through the meshing transmission of the internal and external gears 201, the friction torque generated by the brake disc 19 and the brake gear is transmitted, and it is easy to disassemble and maintain.

[0037] like Figure 1 As shown, in this specific embodiment, the first bearing 3 is close to the transmission gear 10, the second bearing 26 is close to the external gear 201, and a third retaining ring 35 and a limit ring 27 are also provided on the output shaft 2. The third retaining ring 35 is arranged between the second bearing 26 and the connecting boss, and the limit ring 27 is arranged between the second bearing 26 and the transmission flange 29. The transmission flange 29 extends to the outside of the housing 1, and the transmission flange 29 and the end of the output shaft 2 extending out of the housing 1 are detachably connected by mounting bolts 31; an oil seal 28 is arranged between the transmission flange 29 and the housing 1, and the oil seal 28 adopts a lip sealing ring, which is dust-proof and leak-proof, thereby reducing the entry of external dust and other impurities into the housing 1.

[0038] like Figure 1 and Figure 3 As shown, in order to ensure sealing, in this specific embodiment, O-rings 23 are provided between the brake gear ring 20 and the output shaft 2, between the outer circumference of the piston 22 and the inner wall of the cavity, between the inner hole of the piston 22 and the transmission sleeve 1001, and between the inner hole of the driving boss 2201 of the piston 22 and the output shaft 2.

[0039] The working process of the power take-off is:

[0040] In the gear-off state, the control oil hole 36 is blocked, the piston 22 is located on the right, the clutch friction plate 12 and the adjacent dual steel plate 13 are out of contact, and the friction transmission cannot be realized. At the same time, the brake pressure plate 16 presses the brake disc 19 under the action of the return spring 18, and then the brake disc 19 presses on the brake gear ring 20 to prevent the output shaft 2 from rotating, and the transmission gear 10 idles;

[0041] When the gear is engaged, the high-pressure oil enters the oil chamber 38 between the piston 22 and the brake gear ring 20 through the control oil hole 36, forming pressure, pushing the piston 22 to move left, and the piston 22 drives the brake pressure plate 16 to overcome the spring force of the circumferential return spring 18 to move left, and the brake pressure plate 16 moves away from the brake disc 19, and no braking torque can be generated between the brake disc 19 and the brake gear ring 20; at the same time, the driving boss 2201 on the piston 22 presses the clutch friction plate 12 and the dual steel plate 13 under the action of oil pressure, so that the clutch friction plate 12 and the dual steel plate 13 are close to each other, and the power is transmitted to the output shaft 2 by the transmission gear 10, so that the output shaft 2 outputs the transmission;

[0042] When the gear is disengaged again, the oil flow in the control oil hole 36 is cut off, the pressure drops, and the piston 22 and the brake pressure plate 16 are reset under the spring force of the circumferential return spring 18, so that the brake disc 19 presses the brake gear ring 20 to generate a braking torque to prevent the output shaft 2 from rotating; at the same time, the clutch friction plate 12 and the dual steel plate 13 are disengaged, and the transmission gear 10 idles.

[0043] From the above specific implementations, it can be seen that the utility model has the following beneficial effects:

[0044] 1. Through the cooperation of the brake pressure plate 16, the brake disc 19 and the brake gear ring 20, the output shaft 2 can be braked after the clutch mechanism is disconnected, so as to avoid the continuous power output affecting the rear connection mechanism;

[0045] 2. By arranging the return spring 18 of the clutch mechanism on the brake pressure disc 16, it is possible to achieve uniform force application on the brake pressure disc 16, ensure that the brake pressure disc 16 is uniformly stressed and moves smoothly, and achieve uniform force application on the brake disc 19, ensuring smooth braking;

[0046] 3. The contact area with the brake disc 19 is increased by providing a flange to ensure smooth and rapid braking; by providing clearance between the brake disc 19 and the mounting boss 1601 and providing a stopper 1901 on the circumferential surface, it is ensured that the brake disc 19 can only move axially but not rotate, thereby ensuring effective braking;

[0047] 4. The piston 22 is matched with the transmission sleeve 1001 to ensure the movement accuracy of the piston 22. At the same time, the piston 22 is arranged in the inner cavity of the brake gear ring 20 to form an oil cavity 38, so as to ensure that the overall structure is compact and occupies a small space;

[0048] 5. The transmission gear 10 is lubricated through the overflow hole 33, the oil return hole 37 and the lubricating oil hole 32, and the oil return hole 37 increases the fluidity of the oil to prevent excessive oil pressure and prevent impurities in the oil from causing wear of components;

[0049] 6. The friction torque generated by the brake disc 19 and the brake gear is transmitted through the meshing transmission of the internal and external gears 201, and it is easy to disassemble and maintain;

[0050] 7. The oil seal 28 is used to prevent dust and leakage, thereby reducing the entry of foreign dust and other impurities into the box body 1.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A friction power take-off, comprising a housing (1), an output shaft (2) rotatably disposed in the housing (1), a transmission gear (10) rotatably disposed on the output shaft (2), It is characterized in that The output shaft (2) is also provided with a brake gear ring (20). A clutch mechanism is provided between the output shaft (2) and the transmission gear (10). The clutch mechanism comprises a piston (22). The piston (22) is axially movably provided on the output shaft (2). The piston (22) and the brake gear ring (20) are coaxially provided. The piston (22) is connected to a brake pressure disc (16). The brake pressure disc (16) is axially movable. A brake disc (19) is provided between the brake pressure disc (16) and the brake gear ring (20). The brake disc (19) can axially move under the action of the brake pressure disc (16) until it abuts against the brake gear ring (20). A limit member (1901) is provided on the brake disc (19). The limit member (1901) can abut against a limit block (17) in the housing (1).

2. The friction power take-off according to claim 1, It is characterized in that The brake pressure plate (16) is axially movably arranged on the transmission sleeve (1001) of the transmission gear (10), and a mounting hole (1602) is arranged on the brake pressure plate (16). The mounting hole (1602) is a stepped hole, and the axial direction of the mounting hole (1602) is parallel to the axial direction of the output shaft (2). A positioning bolt (15) is relatively movably arranged in the mounting hole (1602), and the positioning bolt (15) extends out of the mounting hole (1602) and is connected to the brake gear ring (20). The clutch mechanism also includes a return spring (18), and the return spring (18) is sleeved on the positioning bolt (15), and the two ends of the return spring (18) are respectively in contact with the head of the positioning bolt (15) and the step of the mounting hole (1602).

3. The friction power take-off according to claim 2, It is characterized in that The brake disc (19) is axially movably arranged on a mounting boss (1601) of the brake pressure disc (16); the brake pressure disc (16) and the brake gear ring (20) are both provided with flanges, and the brake disc (19) is arranged between the two flanges.

4. The friction power take-off according to claim 3, It is characterized in that The brake disc (19) and the mounting boss (1601) are clearance-matched, the limiting member (1901) is a block-shaped structure, the limiting member (1901) is arranged on the circumferential surface of the brake disc (19), two limiting blocks (17) are arranged at corresponding positions of the housing (1), and the limiting member (1901) is located between the two limiting blocks (17) and can abut against one of the limiting blocks (17).

5. The friction power take-off according to claim 1, It is characterized in that The brake gear ring (20) is provided with a cavity, the piston (22) is able to move inside the cavity, the inner hole of the piston (22) is clearance-matched with the transmission sleeve (1001) of the transmission gear (10), an oil chamber (38) is provided between the piston (22) and the cavity, a transition oil passage (34) is provided on the top end surface of the piston (22), and the oil chamber (38) and the control oil hole (36) of the output shaft (2) are both connected to the transition oil passage (34).

6. The friction power take-off according to claim 5, It is characterized in that A driving boss (2201) is provided inside the piston (22), and an overflow hole (33) is provided on the driving boss (2201). The overflow hole (33) is connected to the transition oil passage (34), and the diameter of the overflow hole (33) is smaller than the diameter of the control oil hole (36). The output shaft (2) is also provided with a connected oil return hole (37) and a lubricating oil hole (32). The lubricating oil hole (32) is provided at the location of the transmission gear (10), and the overflow hole (33) is connected to the oil return hole (37) through a clutch mechanism.

7. The friction power take-off according to claim 6, It is characterized in that The clutch mechanism further comprises a plurality of clutch friction plates (12) and paired steel plates (13) arranged alternately, gaps being provided between adjacent clutch friction plates (12) and paired steel plates (13), the clutch friction plates (12) being connected to the transmission sleeve (1001), the paired steel plates (13) being connected to the output shaft (2), and a clutch end plate (11) being provided on the output shaft (2), the clutch end plate (11) being capable of pressing against adjacent clutch friction plates (12), and the driving boss (2201) being capable of abutting against adjacent paired steel plates (13).

8. The friction power take-off according to claim 1, It is characterized in that An external gear (201) is provided on the output shaft (2), the external gear (201) and the output shaft (2) are an integrated structure, the brake gear ring (20) is provided with a connecting boss, the connecting boss is provided with an internal gear (2001), and the internal gear (2001) is meshed with the external gear (201).

9. The friction power take-off according to claim 8, It is characterized in that The output shaft (2) is provided with a first bearing (3) and a second bearing (26), the first bearing (3) being close to the transmission gear (10), and the second bearing (26) being close to the external gear (201). The output shaft (2) is also provided with a third retaining ring (35) and a limiting ring (27), the third retaining ring (35) being provided between the second bearing (26) and the connecting boss, and the limiting ring (27) being provided between the second bearing (26) and the transmission flange (29), the transmission flange (29) extending out of the housing (1), and the transmission flange (29) being detachably connected to an end of the output shaft (2) extending out of the housing (1).

10. The friction power take-off according to claim 9, It is characterized in that An oil seal (28) is provided between the transmission flange (29) and the housing (1).

Images