A lubrication structure for friction surfaces of driven gear and bearing sleeve of dual clutch transmission

Abstract

The present invention discloses a lubrication structure for the friction surface between a driven gear and a bearing sleeve of a dual clutch transmission, comprising a right driven gear, an intermediate shaft, a first needle bearing and a bearing sleeve, wherein the bearing sleeve is sleeved on the intermediate shaft in a fixed connection manner, the right driven gear and the bearing sleeve are supported by the first needle bearing, a boss is provided on the bearing sleeve, an axial oil passage hole is provided in the middle of the intermediate shaft, a first radial oil passage hole is provided on the intermediate shaft, a second radial oil passage hole is provided on the bearing sleeve, the first end of the first radial oil passage hole is connected to the axial oil passage hole, the tail end of the first radial oil passage hole is connected to the first end of the second radial oil passage hole, and the tail end of the second radial oil passage hole leads to the first needle bearing. The present invention can lubricate and cool the friction surface between the right driven gear and the boss, thereby reducing the risks of wear, ablation and bluing.

Description

Technical Field

[0001] The invention relates to a transmission, and in particular to a lubrication structure for friction surfaces of a driven gear and a bearing sleeve of a dual-clutch transmission. Background Art

[0002] like Figure 1 As shown, in the current dual clutch transmission, the left driving gear 1' and the right driving gear 2' are both fitted with the input shaft 3' by interference fit to form an integral body, and the left driven gear 4' and the right driven gear 5' are both sleeved on the intermediate shaft 6' in a rotatable manner, the right driven gear 5' and the intermediate shaft 6' are supported by a first needle bearing 7', and the left driven gear 1' and the intermediate shaft 6' are supported by a second needle bearing 8'. When the synchronous gear sleeve 9' is combined with the left driven gear 4', the left driven gear 4' and the intermediate shaft 6' are combined together, and the left driven gear 4' and the intermediate shaft 6' are at the same speed, but at this time, due to the different transmission ratio settings of the transmission gear, the right driven gear 5' and the intermediate shaft 6' have different speeds of relative motion. At the same time, since the right driving gear 2' and the right driven gear 5' are both helical gears, the right driven gear 5' will generate a rightward axial force under the action of the meshing force. Generally, the bearing sleeve 10' is interference-fitted on the intermediate shaft 6', and a boss 11' is provided at the right end of the bearing sleeve 10' to limit the rightward axial movement of the right driven gear 5'. Since the bearing sleeve 10' and the intermediate shaft 6' are interference-fitted and rotate at the same speed, and since the right driven gear 5' and the intermediate shaft 6' have relative movements at different speeds, the right driven gear 5' and the bearing sleeve 10' have different rotation speeds, which will generate rotational friction. In the absence of lubricating oil, the contact surface between the right driven gear 5' and the bearing sleeve 10' is easily worn, ablated, and bluing, which affects the reliability of the transmission.

[0003] CN101907163A discloses a gear lubrication device for a dual-clutch automatic transmission, comprising an oil guide rail connected between a front housing and a rear housing of the transmission, the oil guide rail being connected to an oil pump in the housing through a valve body, an oil nozzle corresponding to each gear position being arranged on the oil guide rail, and an oil drain valve for regulating the conduction of the oil nozzle being arranged between the oil nozzle and the oil guide rail. By arranging an oil guide rail connected to the oil pump in the front and rear housings of the transmission, oil can be supplied to the oil guide rail through the oil pump, and lubricating oil can be discharged through the oil nozzles corresponding to each gear position on the oil guide rail, thereby achieving lubrication and cooling of the corresponding gear positions, the structure is simple, lubrication and cooling are positioned, the local lubrication of the gear is sufficient, and the lubrication effect is good. In addition, by arranging an oil drain valve for regulating the conduction of the oil nozzle between the oil nozzle and the oil guide rail, the oil pressure can be increased through the valve body according to the lubrication needs, and the oil drain valve is actuated to make the oil nozzle conduction work, thereby there is no need to increase the amount of oil in the housing to ensure lubrication, the oil stirring power loss is small, the life of the gear is extended, and the transmission quality and the working performance of the transmission are improved. Undoubtedly, the technical solution disclosed in this patent document is a beneficial attempt in the relevant technical field. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a lubrication structure for the friction surface of the driven gear and the bearing sleeve of a dual-clutch transmission, which can lubricate and cool the friction surface between the right driven gear and the boss, thereby reducing the risks of wear, ablation and bluing, and has a simple structure, good lubrication effect, and smooth flow of lubricating oil.

[0005] A lubrication structure for friction surfaces of a driven gear and a bearing sleeve of a dual-clutch transmission in the present invention comprises a right driven gear, an intermediate shaft, a first needle bearing and a bearing sleeve, wherein the bearing sleeve is sleeved on the intermediate shaft in a fixed connection manner, the right driven gear and the bearing sleeve are supported by the first needle bearing, a boss is provided on the bearing sleeve, and the boss can limit the right driven gear from moving to the right, an axial oil passage hole is provided in the middle of the intermediate shaft, a first radial oil passage hole is provided on the intermediate shaft, and a second radial oil passage hole is provided on the bearing sleeve, the head end of the first radial oil passage hole is connected to the axial oil passage hole, the tail end of the first radial oil passage hole is connected to the head end of the second radial oil passage hole, and the tail end of the second radial oil passage hole leads to the first needle bearing; lubricating oil can flow to between the right driven gear and the boss through the axial oil passage hole, the first radial oil passage hole, the second radial oil passage hole and the first needle bearing in sequence.

[0006] Furthermore, the first needle roller bearing includes a retaining frame and a plurality of needle rollers, the plurality of needle rollers are rotatably arranged on the retaining frame at intervals along the circumferential direction, and the right driven gear and the bearing sleeve are respectively in contact with the needle rollers.

[0007] Furthermore, the right driven gear includes a hub, spokes and a rim which are arranged in sequence from the inside to the outside in the radial direction. The hub is outermost on the first needle roller bearing. The right end face of the hub abuts against the left end face of the boss. A plurality of oil outlet grooves are arranged on the hub at intervals along the circumferential direction, and the plurality of oil outlet grooves are all recessed to the right in the right end face of the hub.

[0008] Furthermore, the plurality of oil outlet grooves each include a bottom wall, a first side wall and a second side wall, the first side wall and the second side wall gradually move away from the bottom wall from left to right, and the circumferential spacing between the first side wall and the second side wall increases radially.

[0009] Furthermore, an intersection line of the right end surface of the hub and the first side wall is a, an intersection line of the right end surface of the hub and the second side wall is b, and an angle α between a and b is 45°-75°.

[0010] Furthermore, it also includes a plug and a locking bolt. The axial oil channel hole is connected in the left and right directions. The plug is arranged at the right end of the axial oil channel hole. The locking bolt is arranged at the left end of the axial oil channel hole. A bolt oil channel hole is arranged in the middle of the locking bolt. The left end of the bolt oil channel hole is connected to the outside, and the right end of the bolt oil channel hole is connected to the axial oil channel hole.

[0011] Furthermore, it also includes a gearbox case, on which a case oil groove is provided, the head end of the case oil groove is connected to the oil outlet of the lubricating oil pump, and the tail end of the case oil groove corresponds to the position of the bolt oil channel hole.

[0012] Furthermore, the nominal thread diameter of the locking bolt is 1.5-2 times the inner diameter of the bolt oil passage hole, and the minimum outer diameter of the intermediate shaft is 1.5-2 times the inner diameter of the axial oil passage hole.

[0013] The beneficial effects of the present invention are:

[0014] (1) The present invention can lubricate the friction surface between the right driven gear and the boss, and the lubricating oil will continue to flow to the bottom of the gearbox housing, which will generate heat during the flow process and can cool the friction surface between the right driven gear and the boss, thereby reducing the risks of wear, ablation and bluing;

[0015] (2) The present invention can also lubricate and cool the first needle roller bearing, thereby extending the service life of the first needle roller bearing;

[0016] (3) The present invention prevents the leakage of lubricating oil by providing a plug at the right end of the axial oil channel hole, thereby ensuring that the lubricating oil flows along the designated path;

[0017] (4) The present invention has a simple structure, good lubrication effect, and the lubricating oil flows smoothly without silting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0019] Figure 1 It is a structural schematic diagram of an existing dual-clutch transmission;

[0020] Figure 2 It is a schematic diagram of the lubricating oil flow path of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the right driven gear of the present invention.

[0022] The markings in the accompanying drawings are as follows: left driving gear-1'; right driving gear-2'; input shaft-3'; left driven gear-4, 4'; right driven gear-5, 5'; intermediate shaft-6, 6'; first needle roller bearing-7, 7'; second needle roller bearing-8, 8'; synchronous gear sleeve-9, 9'; bearing sleeve-10, 10'; boss-11, 11'; axial oil channel hole-12; first radial oil channel hole-13; second radial oil channel hole-14; wheel hub-15; spoke-16; wheel rim-17; oil outlet groove-18; bottom wall-19; first side wall-20; second side wall-21; plug-22; locking bolt-23; bolt oil channel hole-24; gearbox housing-25; housing oil groove-26. DETAILED DESCRIPTION

[0023] like Figure 2-Figure 3As shown, a lubrication structure of the friction surface between the driven gear and the bearing sleeve of a dual clutch transmission in this embodiment comprises a right driven gear 5, an intermediate shaft 6, a first needle roller bearing 7 and a bearing sleeve 10. The bearing sleeve 10 is sleeved on the intermediate shaft 6 in a fixed connection manner. The right driven gear 5 and the bearing sleeve 10 are supported by the first needle roller bearing 7. A boss 11 is provided on the bearing sleeve 10. The boss 11 can limit the right driven gear 5 from moving rightward. An axial oil passage hole 12 is provided in the middle of the intermediate shaft 6. 6 is provided with a first radial oil passage hole 13, and a second radial oil passage hole 14 is provided on the bearing sleeve 10. The head end of the first radial oil passage hole 13 is connected with the axial oil passage hole 12, the tail end of the first radial oil passage hole 13 is connected with the head end of the second radial oil passage hole 14, and the tail end of the second radial oil passage hole 14 leads to the first needle roller bearing 7; the lubricating oil can flow to between the right driven gear 5 and the boss 11 through the axial oil passage hole 12, the first radial oil passage hole 13, the second radial oil passage hole 14 and the first needle roller bearing 7 in sequence. In this embodiment, the first needle roller bearing 7 includes a retainer and a plurality of needle rollers, and the plurality of needle rollers are rotatably arranged on the retainer along the circumferential interval, and the right driven gear 5 and the bearing sleeve 10 are respectively against the needle rollers. In this embodiment, a plug 22 and a locking bolt 23 are also included. The axial oil passage hole 12 is penetrated in the left-right direction. The plug 22 is arranged at the right end of the axial oil passage hole 12. The locking bolt 23 is arranged at the left end of the axial oil passage hole 12. A bolt oil passage hole 24 is arranged in the middle of the locking bolt 23. The left end of the bolt oil passage hole 24 is connected to the outside, and the right end of the bolt oil passage hole 24 is connected to the axial oil passage hole 12. In this embodiment, a gearbox case 25 is also included. A case oil groove 26 is arranged on the gearbox case 25. The head end of the case oil groove 26 is connected to the oil outlet of the lubricating oil pump, and the tail end of the case oil groove 26 corresponds to the position of the bolt oil passage hole 24.

[0024] The left driven gear 4 and the right driven gear 5 are both rotatably sleeved on the intermediate shaft 6. The right driven gear 5 and the intermediate shaft 6 are supported by the first needle bearing 7, and the left driven gear 4 and the intermediate shaft 6 are supported by the second needle bearing 8. When the dual clutch gearbox is working and when the synchronous gear sleeve 9 is combined with the left driven gear 4, the left driven gear 4 and the intermediate shaft 6 are combined together, and the left driven gear 4 and the intermediate shaft 6 are at the same speed. However, due to the different transmission ratio settings of the transmission gear, the right driven gear 5 and the intermediate shaft 6 have different speeds of relative motion. At the same time, since the right driving gear and the right driven gear 5 are both helical gears, the right driven gear 5 will generate a rightward axial force under the action of the meshing force. In addition, since the bearing sleeve 10 and the intermediate shaft 6 are fitted with interference fit to generate the same speed rotation, and the right driven gear 5 and the intermediate shaft 6 have different speeds of relative motion, the right driven gear 5 and the bearing sleeve 10 have different speeds of rotation. At this time, a rotating friction force will be generated between the right driven gear 5 and the boss 11. In this embodiment, the lubricating oil enters the oil groove 26 of the case from the oil outlet of the lubricating oil pump, and then flows along the oil groove 26 to between the gearbox case 25 and the locking bolt 23, and then the lubricating oil enters the axial oil passage hole 12 from the bolt oil passage hole 24. Under the action of centrifugal force, the lubricating oil successively enters the first radial oil passage hole 13 and the second radial oil passage hole 14, and flows to the gap between the needle rollers of the first needle roller bearing 7. Since the inner wall of the right driven wheel abuts against the needle roller, and the outer wall of the bearing sleeve 10 abuts against the needle roller, the needle roller As the right driven wheel rotates, the lubricating oil can flow between the right driven gear 5 and the boss 11, lubricating the friction surface between the right driven gear 5 and the boss 11, and the lubricating oil will continue to flow to the bottom of the gearbox housing 25, and will bring heat during the flow process, which can cool the friction surface between the right driven gear 5 and the boss 11, thereby reducing the risks of wear, ablation and bluing, and at the same time, the lubricating oil can also lubricate and cool the first needle bearing 7 when passing through it, extending the service life of the first needle bearing 7. In addition, a plurality of through holes that connect the axial oil passage hole 12 with the outside can be opened on the intermediate shaft 6, lubricating and cooling the parts that cooperate with the intermediate shaft 6, and making full use of the lubricating oil introduced from the gearbox housing 25 into the axial oil passage hole 12.

[0025] In this embodiment, the width of the box oil groove 26 is 7 mm-9 mm, the depth is 15 mm-20 mm, the number of the box oil groove 26 can be one or two; the diameter of the first radial oil channel hole 13 and the diameter of the second radial oil channel hole 14 can both be 2 mm-3 mm.

[0026] In this embodiment, the right driven gear 5 includes a hub 15, a spoke 16 and a rim 17 which are arranged in sequence from the inside to the outside in the radial direction. The hub 15 is sleeved on the first needle roller bearing 7. The right end face of the hub 15 abuts against the left end face of the boss 11. A plurality of oil outlet grooves 18 are arranged at intervals along the circumferential direction on the hub 15. The plurality of oil outlet grooves 18 are all recessed to the right in the right end face of the hub 15. The number of the oil outlet grooves 18 can be three or four, and preferably, the plurality of oil outlet grooves 18 are arranged at equal intervals along the circumferential direction. The lubricating oil flows from the first needle roller bearing 7 to the oil outlet groove 18. The lubricating oil in the oil outlet groove 18 can lubricate the friction surface as the right driven gear 5 rotates relative to the boss 11. The oil outlet groove 18 can improve the lubrication effect.

[0027] In this embodiment, the plurality of oil outlet grooves 18 include a bottom wall 19, a first side wall 20 and a second side wall 21. The first side wall 20 and the second side wall 21 are gradually away from the bottom wall 19 from left to right, and the circumferential spacing between the first side wall 20 and the second side wall 21 increases radially. The opening of the oil outlet groove 18 is gradually enlarged from left to right and gradually enlarged radially, forming a trumpet shape. Therefore, when the right driven gear 5 rotates, the lubricating oil can be thrown to the boss 11 in a fan-shaped shape that gradually enlarges radially under the action of centrifugal force, preventing the lubricating oil from accumulating in the oil outlet groove 18, further improving the lubrication and heat dissipation effects. The first side wall 20 and the second side wall 21 can be arc-shaped walls, or the first side wall 20 and the second side wall 21 can be inclined plane walls.

[0028] In this embodiment, the intersection line of the right end surface of the hub 15 and the first side wall 20 is a, the intersection line of the right end surface of the hub 15 and the second side wall 21 is b, and the angle α between a and b is 45°-75°, preferably α=60°.

[0029] In this embodiment, the nominal thread diameter of the locking bolt 23 is 1.5-2 times the inner diameter of the bolt oil passage hole 24, and the minimum outer diameter of the intermediate shaft 6 is 1.5-2 times the inner diameter of the axial oil passage hole 12. While ensuring the strength of the locking bolt 23 and the intermediate shaft 6, the lubricating oil can flow smoothly.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A lubrication structure for the friction surface between a driven gear and a bearing sleeve of a dual clutch transmission, comprising a right driven gear (5), an intermediate shaft (6), a first needle roller bearing (7) and a bearing sleeve (10), wherein the bearing sleeve (10) is sleeved on the intermediate shaft (6) in a fixed connection manner, the right driven gear (5) and the bearing sleeve (10) are supported by the first needle roller bearing (7), a boss (11) is provided on the bearing sleeve (10), and the boss (11) can limit the right driven gear (5) from moving to the right, and is characterized in that: An axial oil passage hole (12) is provided in the middle of the intermediate shaft (6), a first radial oil passage hole (13) is provided on the intermediate shaft (6), and a second radial oil passage hole (14) is provided on the bearing sleeve (10); the head end of the first radial oil passage hole (13) is connected to the axial oil passage hole (12), the tail end of the first radial oil passage hole (13) is connected to the head end of the second radial oil passage hole (14), and the tail end of the second radial oil passage hole (14) leads to the first needle roller bearing (7); the lubricating oil can flow to between the right driven gear (5) and the boss (11) through the axial oil passage hole (12), the first radial oil passage hole (13), the second radial oil passage hole (14) and the first needle roller bearing (7) in sequence; The right driven gear (5) comprises a hub (15), a spoke (16) and a rim (17) which are arranged in sequence from the inside to the outside in a radial direction, the hub (15) is sleeved on the first needle roller bearing (7), the right end surface of the hub (15) abuts against the left end surface of the boss (11), and a plurality of oil outlet grooves (18) are arranged on the hub (15) at intervals in the circumferential direction, and the plurality of oil outlet grooves (18) are all recessed to the right in the right end surface of the hub (15); The plurality of oil outlet grooves (18) each comprise a bottom wall (19), a first side wall (20) and a second side wall (21); the first side wall (20) and the second side wall (21) are each gradually away from the bottom wall (19) from left to right, and the spacing between the first side wall (20) and the second side wall (21) in the circumferential direction increases in the radial direction; It also includes a plug (22) and a locking bolt (23); the axial oil passage hole (12) is connected in the left-right direction; the plug (22) is arranged at the right end of the axial oil passage hole (12); the locking bolt (23) is arranged at the left end of the axial oil passage hole (12); a bolt oil passage hole (24) is arranged in the middle of the locking bolt (23); the left end of the bolt oil passage hole (24) is connected to the outside; and the right end of the bolt oil passage hole (24) is connected to the axial oil passage hole (12).

2. The lubrication structure for the friction surface between the driven gear and the bearing sleeve of the dual clutch transmission according to claim 1, characterized in that: The first needle roller bearing (7) comprises a retaining frame and a plurality of needle rollers, the plurality of needle rollers being rotatably arranged on the retaining frame at intervals along the circumferential direction, and the right driven gear (5) and the bearing sleeve (10) respectively abut against the needle rollers.

3. The lubrication structure for the friction surface between the driven gear and the bearing sleeve of the dual clutch transmission according to claim 1, characterized in that: The intersection line of the right end surface of the wheel hub (15) and the first side wall (20) is a, the intersection line of the right end surface of the wheel hub (15) and the second side wall (21) is b, and the angle α between a and b is 45°-75°.

4. The lubrication structure for the friction surface between the driven gear and the bearing sleeve of the dual clutch transmission according to claim 3, characterized in that: It also comprises a gearbox case (25), the gearbox case (25) being provided with a case oil groove (26), the head end of the case oil groove (26) being connected to the oil outlet of the lubricating oil pump, and the tail end of the case oil groove (26) corresponding to the position of the bolt oil channel hole (24).

5. The lubrication structure for the friction surface between the driven gear and the bearing sleeve of the dual clutch transmission according to claim 4, characterized in that: The nominal thread diameter of the locking bolt (23) is 1.5 to 2 times the inner diameter of the bolt oil passage hole (24), and the minimum outer diameter of the intermediate shaft (6) is 1.5 to 2 times the inner diameter of the axial oil passage hole (12).

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