A friction type power take-off torque increasing structure

Abstract

The present invention discloses a torque-increasing structure of a friction-type power take-off, comprising a housing, an output end cover, an output shaft gear, an output shaft, a gear ring, a gear-engaging piston, a torque-increasing assembly and a clutch friction plate group, wherein the output shaft is sequentially provided with an output shaft gear, a torque-increasing assembly, a gear-engaging piston and a gear ring; the torque-increasing assembly comprises an engaging plate, a sliding sleeve, a limit bolt, a clamping bolt, a clamping spring and a tension spring; the gear-engaging piston is sleeved in the gear ring, and the engaging plate is embedded in the gear-engaging piston through a second notch; a clutch friction plate group is arranged between the output shaft gear and the gear ring, a first oil passage is arranged in the middle of the output shaft, and an oil passage outlet is arranged between the gear-engaging piston and the gear ring. The present invention reduces the sensitivity to oil pressure through the torque-increasing assembly, obtains a higher transmission torque under the same number of friction plates, reduces the number, diameter and clamping force of friction plates under the same torque, and has a simple structure, a small volume and a light weight.

Description

Technical Field

[0001] The invention relates to a torque increasing mechanism of a full-power friction power take-off for a truck, belonging to the technical field of automobile parts. Background Art

[0002] With the development of society, the demand for special vehicles is constantly increasing, and there are more and more types of vehicles. Special vehicles generally use power take-offs to output power from the engine or gearbox, so that the vehicle can operate under special applications. For some special applications, the vehicle uses a power take-off during driving, and the power take-off needs to be able to engage and disengage during driving. Generally, a friction plate structure is used, but when the required power take-off torque is too large, more friction plates are required, the diameter is larger, and the required clamping force is also greater, resulting in a heavier power take-off and a complex structure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a friction power take-off torque-increasing structure in response to the defects of the prior art, which can retain the driving gear-shifting function of the friction power take-off and obtain greater torque with a smaller number of friction plates with smaller diameters.

[0004] In order to solve this technical problem, the present invention provides a friction power take-off torque-increasing structure, including a housing, an output end cover, an output shaft gear, an output shaft, a gear ring, a gear-engaging piston, a torque-increasing assembly and a clutch friction plate group, wherein the output shaft is sequentially provided with an output shaft gear, a torque-increasing assembly, a gear-engaging piston and a gear ring; the torque-increasing assembly includes a coupling plate, a sliding sleeve, a limiting bolt, a clamping bolt, a clamping spring and a tension spring, a torque-transmitting boss is provided on the coupling plate, a slot hole is provided on the sliding sleeve, the sliding sleeve is fitted with the coupling plate, the torque-transmitting boss is embedded in the slot hole and connected by the limiting bolt, and the circumferential length of the slot hole is slightly larger than the diameter of the torque-transmitting boss , so that the sliding sleeve can rotate relative to the engaging piece; one end of the tension spring is connected to the sliding sleeve, and the other end is connected to the limiting bolt; the outer side of the engaging piece is provided with a first engaging tooth and a second notch, and the inner ring of the sliding sleeve is provided with a first torque transmission tooth; the gear ring is provided with a second engaging tooth, and the first engaging tooth of the engaging piece is constantly meshed with the second engaging tooth outwardly; the gear ring is fixedly connected and rotated with the output shaft, the gear-engaging piston sleeve is arranged in the gear ring, and the engaging piece is embedded in the gear-engaging piston through the second notch; a clutch friction plate group is provided between the output shaft gear and the gear ring, a first oil channel is provided in the middle of the output shaft, and an oil channel outlet is provided between the gear-engaging piston and the gear ring.

[0005] Tension springs are installed between the limit bolts and the sliding sleeve, and any two adjacent tension springs pull the limit bolts in opposite directions, so that the torque transmission boss is constrained in the middle position of the slot hole.

[0006] The gear ring is provided with a circular ring structure, the gear-engaging piston sleeve is arranged in the circular ring structure, and is provided with an O-ring seal.

[0007] The output shaft is provided with a retaining ring and a retaining ring, the retaining ring is limited by the left side of the retaining ring, and a spring is provided between the retaining ring and the gear-engaging piston to press the gear-engaging piston and the gear ring.

[0008] The gear-engaging piston is provided with a first notch and a circular hole, and the engaging piece is provided with a second notch and a first boss corresponding thereto. The engaging piece is embedded in the gear-engaging piston through the second notch, and the clamping bolt and the clamping spring clamp the engaging piece on the gear-engaging piston. The first boss is inserted into the circular hole and can slide relatively.

[0009] The output shaft gear is provided with a second torque transmission tooth, and the clutch friction plate group is arranged between the second torque transmission tooth and the second engagement tooth.

[0010] The right end of the second torque transmission tooth of the output shaft gear is provided with an outer conical tooth with an oblique angle, and the left end of the first torque transmission tooth of the sliding sleeve is provided with an inner conical tooth with an oblique angle.

[0011] A first bearing is arranged between the output shaft and the output shaft gear, and a second oil passage is arranged on the output shaft, through which lubricating oil is usually passed to lubricate the first bearing and the clutch friction plate group.

[0012] The box body is fixedly connected to the output end cover, and two ends of the output shaft are connected and supported by the box body and the output end cover through a second bearing and a third bearing respectively.

[0013] Beneficial effects: The invention reduces the sensitivity to oil pressure through a mechanical torque-increasing component, can still stably transmit under a wide range of oil pressure fluctuations, can obtain a higher transmission torque under the same number of friction plates, can reduce the number, diameter and clamping force of friction plates under the same torque, is suitable for taking power during vehicle driving, and can realize the disengagement and engagement of the power take-off during vehicle driving. The invention has a simple structure, a small size and a light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the gear-engaging piston of the present invention;

[0016] Figure 3 It is a structural schematic diagram of the torque increasing assembly of the present invention;

[0017] Figure 4 It is a structural schematic diagram of the sliding sleeve of the present invention;

[0018] Figure 5 It is a schematic diagram of the front structure of the joining piece of the present invention;

[0019] Figure 6 It is a schematic diagram of the rear structure of the bonding sheet of the present invention;

[0020] Figure 7It is a schematic diagram of the assembly of the torque increasing assembly and the gear engaging piston of the present invention;

[0021] Figure 8 This is a schematic diagram of the compressed state of the gear-engaging piston of the present invention;

[0022] Fig. 9 This is a schematic diagram of the torque increasing assembly of the present invention in a connected state;

[0023] Fig.10 It is a schematic diagram of the structure of the output shaft gear of the present invention;

[0024] Fig.11 It is a structural schematic diagram of the gear ring of the present invention;

[0025] Fig.12 It is a front view schematic diagram of the assembly of the torque increasing assembly and the gear engaging piston of the present invention;

[0026] Fig.13 For the present invention Fig.12 AA section diagram of the torque increasing assembly and the gear engaging piston assembly;

[0027] Fig.14 For the present invention Fig.12 BB cross-sectional diagram of the torque increasing assembly and the gear engaging piston assembly;

[0028] Fig.15 For the present invention Fig.12 BB cross-sectional diagram when the torque increasing assembly is engaged;

[0029] Fig.16 It is a schematic diagram of the general assembly of the present invention.

[0030] In the figure: 1, housing; 2, output end cover; 3, output shaft gear; 31, second torque transmission gear; 311, outer cone gear; 4, output shaft; 41, first oil passage; 411, oil passage outlet; 42, second oil passage; 5, gear ring; 51, second engaging tooth; 52, circular ring structure; 53, O-ring; 6, gear-engaging piston; 61, first notch; 62, circular hole; 7, torque-increasing assembly; 71, engaging plate; 711, torque transmission cam Platform; 712, first engaging tooth; 713, second notch; 714, first boss; 72, sliding sleeve; 721, slot; 722, first torque transmission tooth; 7221, inner conical tooth; 73, limit bolt; 74, clamping bolt; 75, clamping spring; 76, tension spring; 8, clutch friction plate group; 9, retaining spring; 10, retaining ring; 11, spring; 12, first bearing; 13, second bearing; 14, third bearing. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figure 1-Figure 16As shown, the present invention provides a friction power take-off torque increasing structure, including a housing 1, an output end cover 2, an output shaft gear 3, an output shaft 4, a gear ring 5, a gear engaging piston 6, a torque increasing assembly 7 and a clutch friction plate group 8, wherein the output shaft 4 is sequentially provided with the output shaft gear 3, the torque increasing assembly 7, the gear engaging piston 6 and the gear ring 5; the torque increasing assembly 7 includes a coupling piece 71, a sliding sleeve 72, a limiting bolt 73, a clamping bolt 74, a clamping spring 75 and a tension spring 76, a torque transmitting boss 711 is provided on the coupling piece 71, a corresponding slot hole 721 is provided on the sliding sleeve 72, the sliding sleeve 72 is fitted with the coupling piece 71, the torque transmitting boss 711 is embedded in the slot hole 721 and is connected by the limiting bolt 73, the circumferential length of the slot hole 721 is slightly larger than the diameter of the torque transmitting boss 711, and the sliding sleeve 72 is provided with a corresponding slot hole 721, the sliding sleeve 72 is fitted with the coupling piece 71, the torque transmitting boss 711 is embedded in the slot hole 721 and is connected by the limiting bolt 73, the circumferential length of the slot hole 721 is slightly larger than the diameter of the torque transmitting boss 711, and the sliding sleeve 72 is provided with a corresponding slot hole 721. The sleeve 72 can rotate relative to the engaging piece 71; one end of the tension spring 76 is connected to the sliding sleeve 72, and the other end is connected to the limiting bolt 73; the outer side of the engaging piece 71 is provided with a first engaging tooth 712 and a second notch 713, and the inner ring of the sliding sleeve 72 is provided with a first torque transmission tooth 722; the ring gear 5 is provided with a second engaging tooth 51, and the first engaging tooth 712 of the engaging piece 71 is constantly meshed with the second engaging tooth 51 outwardly; the ring gear 5 is fixedly connected and rotated with the output shaft 4, the gear engaging piston 6 is sleeved in the ring gear 5, and the engaging piece 71 is embedded in the gear engaging piston 6 through the second notch 713; a clutch friction plate group 8 is provided between the output shaft gear 3 and the ring gear 5, a first oil channel 41 is provided in the middle of the output shaft 4, and an oil channel outlet 411 is provided between the gear engaging piston 6 and the ring gear 5.

[0033] There are eight limit bolts 73 , and a tension spring 76 is installed between each limit bolt 73 and the sliding sleeve 72 . Any two adjacent tension springs 76 pull the limit bolts 73 in opposite directions, so that the torque transmission boss 711 is constrained in the middle position of the slot hole 721 .

[0034] The gear ring 5 is provided with a circular ring structure 52 , and the gear-engaging piston 6 is sleeved in the circular ring structure 52 and is provided with an O-ring 53 for sealing.

[0035] The output shaft 4 is provided with a retaining ring 9 and a retaining ring 10 . The retaining ring 10 is limited by the left side of the retaining ring 9 . A spring 11 is provided between the retaining ring 10 and the gear-engaging piston 6 to press the gear-engaging piston 6 and the gear ring 5 .

[0036] The gear-engaging piston 6 is provided with a first notch 61 and a circular hole 62, and the engaging piece 71 is provided with a second notch 713 and a first boss 714 corresponding thereto. The engaging piece 71 is embedded in the gear-engaging piston 6 through the second notch 713, and the clamping bolt 74 and the clamping spring 75 clamp the engaging piece 71 on the gear-engaging piston 6. The first boss 714 is inserted into the circular hole 62 and can slide relatively.

[0037] The output shaft gear 3 is provided with a second torque transmission tooth 31 , and the clutch friction plate group 8 is arranged between the second torque transmission tooth 31 and the second engagement tooth 51 .

[0038] The second torque transmission tooth 31 of the output shaft gear 3 is provided with an outer cone tooth 311 with an oblique angle at the right end, and the first torque transmission tooth 722 of the sliding sleeve 72 is provided with an inner cone tooth 7221 with an oblique angle at the left end.

[0039] A first bearing 12 is disposed between the output shaft 4 and the output shaft gear 3 . The output shaft 4 is further provided with a second oil passage 42 , through which lubricating oil is always passed to lubricate the first bearing 12 and the clutch friction plate group 8 .

[0040] The housing 1 is fixedly connected to the output end cover 2, and both ends of the output shaft 4 are connected and supported by the housing 1 and the output end cover 2 through a second bearing 13 and a third bearing 14, respectively.

[0041] The working process of the present invention is as follows:

[0042] In the gear-off state, the first oil passage 41 is blocked, the gear-engaging piston 6 is located at the right end and is pressed against the inner wall of the gear ring 5 under the action of the spring 11, and the torque-increasing assembly 7 is pressed against the gear-engaging piston 6 under the action of the compression spring 75; the clutch friction plate group 8 is separated, and the output shaft gear 3 can rotate freely through the first bearing 12, and the power cannot be transmitted to the gear ring 5 and the output shaft 4. Figure 1 shown.

[0043] When the gear is engaged, the high-pressure oil enters between the gear engaging piston 6 and the inner wall of the gear ring 5 through the first oil passage 41 and the oil passage outlet 411, forming pressure, pushing the gear engaging piston 6 to overcome the pressure of the spring 11 and move left, pressing the clutch friction plate group 8, so that the power of the output shaft gear 3 is transmitted to the gear ring 5 through the clutch friction plate group 8, and then transmitted to the output shaft 4. Figure 8 As shown; after the gear-engaging piston 6 presses the clutch friction plate group 8, the oil pressure continues to increase. When the pressure reaches a certain value, the first boss 714 pushes the torque-increasing assembly 7 to overcome the pressure of the compression spring 75 and move leftward, so that the first torque-transmitting tooth 722 of the sliding sleeve 72 is engaged with the second torque-transmitting tooth 31. At this time, the clutch friction plate group 8 and the torque-increasing assembly 7 are driven together to increase the torque transmission capacity, as shown in FIG. Fig. 9 , Fig.15 As shown; in addition, Figure 4 and Fig.10 As shown, when the second torque transmission tooth 31 and the first torque transmission tooth 722 are just opposite to the tooth groove, they can mesh normally; when the teeth are not opposite to the tooth groove, the sliding sleeve 72 can be rotated relative to the engaging plate 71 through the oblique angle of the outer conical tooth 311 and the inner conical tooth 7221, and the meshing is completed when the teeth are opposite to the tooth groove.

[0044] When the gear is disengaged, the oil flow in the first oil channel 41 is cut off, the pressure drops, the gear-engaging piston 6 is reset under the pressure of the spring 11, the engaging piece 71 drives the sliding sleeve 72 to disengage under the pressure of the clamping bolt 74, and the sliding sleeve 72 is pulled by the tension spring 76 to return to the middle position of the slot 721 and reset.

[0045] The present invention, through the combined action of the torque increasing component and the clutch friction plate group, can retain the driving gear shifting function of the friction power take-off, and can obtain greater torque with a smaller number and diameter of friction plates. The mechanical torque increasing component reduces the sensitivity to oil pressure, and stable transmission can still be achieved under a wide range of oil pressure fluctuations.

[0046] The above embodiments of the present invention are merely illustrative and not exclusive, and all modifications within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A friction power take-off torque increasing structure, characterized in that: The invention comprises a housing (1), an output end cover (2), an output shaft gear (3), an output shaft (4), a gear ring (5), a gear-engaging piston (6), a torque-increasing assembly (7) and a clutch friction plate group (8). The output shaft (4) is sequentially provided with an output shaft gear (3), a torque-increasing assembly (7), a gear-engaging piston (6) and a gear ring (5); the torque-increasing assembly (7) comprises a coupling plate (71), a sliding sleeve (72), a limiting bolt (73), a clamping bolt (74), a clamping spring (75) and a tension spring (76); the coupling plate (71) is provided with a torque-transmitting boss (711); the sliding sleeve (72) is provided with a slot hole (721); the sliding sleeve (72) is fitted with the coupling plate (71); the torque-transmitting boss (711) is embedded in the slot hole (721) and connected via the limiting bolt (73); the circumferential length of the slot hole (721) is slightly larger than the diameter of the torque-transmitting boss (711), so that the sliding sleeve (72) can be relatively close to the coupling plate (71). The plate (71) rotates; one end of the tension spring (76) is connected to the sliding sleeve (72), and the other end is connected to the limit bolt (73); the outer side of the engaging plate (71) is provided with a first engaging tooth (712) and a second notch (713), and the inner ring of the sliding sleeve (72) is provided with a first torque transmission tooth (722); the ring gear (5) is provided with a second engaging tooth (51), and the first engaging tooth (712) of the engaging plate (71) is outwardly constantly meshed with the second engaging tooth (51); the ring gear (5) is fixedly connected to the output shaft (4) for rotation, the gear-engaging piston (6) is sleeved in the ring gear (5), and the engaging plate (71) is embedded in the gear-engaging piston (6) through the second notch (713); a clutch friction plate group (8) is provided between the output shaft gear (3) and the ring gear (5), a first oil channel (41) is provided in the middle of the output shaft (4), and an oil channel outlet (411) is provided between the gear-engaging piston (6) and the ring gear (5); Tension springs (76) are installed between the limiting bolt (73) and the sliding sleeve (72), and any two adjacent tension springs (76) pull the limiting bolt (73) in opposite directions, so that the torque transmission boss (711) is constrained in the middle position of the slot hole (721); The output shaft (4) is provided with a retaining ring (9) and a retaining ring (10), the retaining ring (10) is limited by the left side of the retaining ring (9), and a spring (11) is provided between the retaining ring (10) and the gear-engaging piston (6) to press the gear-engaging piston (6) and the gear ring (5); The right end of the second torque transmission tooth (31) of the output shaft gear (3) is provided with an outer cone tooth (311) with an oblique angle, and the left end of the first torque transmission tooth (722) of the sliding sleeve (72) is provided with an inner cone tooth (7221) with an oblique angle.

2. The torque increasing structure of the friction power take-off according to claim 1, characterized in that: The gear ring (5) is provided with a circular ring structure (52), and the gear-engaging piston (6) is sleeved in the circular ring structure (52) and is provided with an O-ring (53) for sealing.

3. The torque increasing structure of the friction power take-off according to claim 1, characterized in that: The gear-engaging piston (6) is provided with a first notch (61) and a circular hole (62), the engaging piece (71) is provided with a second notch (713) and a first boss (714) corresponding thereto, the engaging piece (71) is embedded in the gear-engaging piston (6) through the second notch (713), the clamping bolt (74) and the clamping spring (75) clamp the engaging piece (71) onto the gear-engaging piston (6), and the first boss (714) is inserted into the circular hole (62) and can slide relatively therewith.

4. The torque increasing structure of the friction power take-off according to claim 1, characterized in that: The output shaft gear (3) is provided with a second torque transmission tooth (31), and the clutch friction plate group (8) is arranged between the second torque transmission tooth (31) and the second engagement tooth (51).

5. The torque increasing structure of the friction power take-off according to claim 1, characterized in that: A first bearing (12) is provided between the output shaft (4) and the output shaft gear (3), and the output shaft (4) is further provided with a second oil passage (42) through which lubricating oil is constantly passed to lubricate the first bearing (12) and the clutch friction plate group (8).

6. The torque increasing structure of the friction power take-off according to any one of claims 1 to 5, characterized in that: The housing (1) is fixedly connected to the output end cover (2), and both ends of the output shaft (4) are connected and supported to the housing (1) and the output end cover (2) via a second bearing (13) and a third bearing (14), respectively.

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