CN111322363A - A multi-speed transmission with oil circuit structure - Google Patents

Abstract

The invention provides a multi-speed transmission with an oil circuit structure, comprising a casing, an input shaft, an output shaft, a central shaft, a first clutch, a second clutch, a third clutch, a first intermediate shaft gear set, and a second intermediate shaft. Shaft gear set, gear pair unit and oil circuit structure; the oil circuit structure includes a casing oil circuit, an input shaft oil circuit, an output shaft oil circuit, a central shaft oil circuit, a first clutch oil circuit, a second clutch oil circuit and a third clutch oil circuit Clutch oil circuit, the first branch of the casing oil circuit is arranged in conduction with the input shaft oil circuit; the second branch of the casing oil circuit is arranged in conduction with the central shaft oil circuit; the casing oil circuit The third branch of the clutch is connected to the output shaft oil circuit; the oil circuit structure is filled with hydraulic oil, so only a small amount of hydraulic oil can be adjusted to break the oil pressure balance in the piston chamber of the second clutch, and then The first clutch, the second clutch and the third clutch are driven to perform the clutch operation, so as to achieve the effect of zero time waiting for switching the clutch.

Description

A multi-speed transmission with oil circuit structure

technical field

The invention relates to the field of transmissions, in particular to a multi-speed transmission with an oil circuit structure.

Background technique

A transmission is a set of gears used to coordinate the rotational speed of the engine and/or the motor with the actual driving speed of the wheels, so as to maximize the performance of the engine and/or the motor. Transmissions can create different gear ratios between the engine and/or electric machine and the wheels while the vehicle is in motion. However, in the existing eight-speed automobile, the eight-speed transmission needs to engage through eight sets of gear pairs, thereby achieving a change between eight gears. As a result, the size of the existing transmission is large, and the power transmission path of the existing eight-speed transmission is not unique, and the shifting mechanism is mostly a synchronizer or a fork structure.

SUMMARY OF THE INVENTION

Therefore, it is necessary to provide a multi-speed transmission with an oil circuit structure, which solves the problem that the switching time gap of the existing transmission is relatively long when changing gears.

In order to achieve the above object, the inventor provides a multi-speed transmission with an oil circuit structure, which includes an input shaft, an output shaft, a gear pair unit, a first countershaft gear set, a second countershaft gear set, a central shaft and an oil passage. structure;

The input shaft is provided with a first input gear, the output shaft is provided with a first output gear, the central shaft is provided with a first central gear and a second central gear, and the driving member of the gear pair unit is provided on the input shaft. and/or on the central shaft, and the gear pair unit is located between the first input gear and the first sun gear;

The linkage member of the gear pair unit is arranged on the main shaft of the first countershaft gear set, and the first countershaft gear set is used for meshing with the first input gear, the driving member of the gear pair unit and the first sun gear respectively A gear pair transmission is formed, and the second intermediate shaft gear set is used for meshing with the second central gear and the first output gear to form a gear pair transmission;

The gear pair unit is used for transmitting the power of the input shaft to the first countershaft gear set and/or transmitting the power on the first countershaft gear set to the center shaft;

A first clutch is arranged on the input shaft between the first input gear and the gear pair unit, the first clutch end of the first clutch is arranged on the first input gear, and the second clutch end of the first clutch Set on the gear pair unit;

A second clutch is arranged on the central shaft between the gear pair unit and the first sun gear, the first clutch end of the second clutch is arranged on the gear pair unit, and the second clutch end of the second clutch is arranged on the first sun gear;

A third clutch is set on the output shaft between the second sun gear and the first output gear, the first clutch end of the third clutch is set on the second sun gear, and the second clutch of the third clutch is set on the second sun gear. The end is arranged on the first output gear;

The rotational speed of the input shaft is greater than, equal to or less than the rotational speed of the output shaft;

The oil circuit structure includes a casing oil circuit, an input shaft oil circuit, an output shaft oil circuit, a central shaft oil circuit, a first clutch oil circuit, a second clutch oil circuit and a third clutch oil circuit. is arranged in the casing, the input shaft oil circuit is arranged in the input shaft, the first branch of the casing oil circuit is arranged in conduction with the input shaft oil circuit; the central shaft oil passage is arranged in the central shaft, The second branch of the casing oil circuit is connected to the central shaft oil circuit; the output shaft oil circuit is arranged in the output shaft, and the third branch of the casing oil circuit is connected to the output shaft oil circuit The first clutch oil circuit is arranged in the first clutch, and the input shaft oil circuit is connected with the first clutch oil circuit; the second clutch oil circuit is arranged in the second clutch, so The central shaft oil circuit is arranged in conduction with the second clutch oil passage; the third clutch oil passage is arranged in the third clutch, and the output shaft oil passage is arranged in conduction with the third clutch oil passage.

Further, the housing oil circuit includes a first dual-hole oil delivery circuit, a second dual-hole delivery oil circuit and a third dual-hole delivery oil circuit, and the oil inlet of the first dual-hole delivery oil circuit, the second dual-hole delivery oil circuit The oil inlet of the double-hole conveying oil passage and the oil inlet of the third double-hole conveying oil passage are arranged on the outer side of the casing, and the oil outlet of the first double-hole conveying oil passage is arranged at the shaft hole of the input shaft On the inner surface, the oil outlet of the second double-hole conveying oil passage is arranged on the inner face of the shaft hole of the central shaft, and the oil outlet of the third double-hole conveying oil passage is arranged on the inner face of the shaft hole of the output shaft.

Further, the first clutch oil passage includes a first oil guide passage and a second oil guide passage;

The first oil guide passage is arranged between one side of the inner cavity of the piston of the clutch and the inner side of the inner hole of the clutch, and the second oil passage is arranged between the other side of the inner cavity of the piston of the clutch and the inner side of the inner hole of the clutch ;

The second clutch oil passage and the third clutch oil passage are arranged in the same structure as the first clutch oil passage.

Further, the first clutch includes a first clutch block, a second clutch block and a piston unit;

The piston unit includes a double-headed piston body and a cavity, the cross-section of the double-headed piston body is I-shaped, one end of the double-headed piston body is arranged in the cavity, and the other end of the double-headed piston body is located in the cavity. The oil outlet of the first oil guide passage is arranged on one side of the cavity, and the oil outlet of the second oil guide passage is arranged on the other side of the cavity;

The first clutch block includes a first friction plate group, the second clutch block includes a second friction plate group, the first friction plate group is located on one side of the other end of the double-headed piston body, and the second The friction plate group is located on the other side of the other end of the double-headed piston body, the first clutch block and the second clutch block are used to be arranged on the gear pair, and the double-headed piston body is used to drive the first friction plate group. Or one group of the second friction plate group is combined and the other group is separated;

The second clutch and the third clutch are arranged in the same structure as the first clutch.

Further, the input shaft oil circuit includes a first oil conveying circuit and a second oil conveying circuit, and an oil inlet of the first conveying oil circuit is arranged in communication with an oil passage of the first double-hole conveying oil circuit, The oil outlet of the first oil conveying circuit is arranged in communication with the first oil guiding passage, and the oil inlet of the second oil conveying passage is arranged in communication with another oil passage of the first double-hole oil passage, The oil outlet of the second oil conveying passage is arranged in communication with the second oil guiding passage.

Further, the central shaft oil circuit includes a third oil conveying circuit and a fourth oil conveying circuit, and the oil inlet of the third oil conveying circuit is arranged in communication with an oil passage of the second double-hole oil circuit, so The oil outlet of the third conveying oil circuit is arranged in communication with an oil guide passage of the second clutch oil passage, and the oil inlet of the fourth conveying oil passage is connected to another oil passage of the second double-hole oil passage. Conduction setting, the oil outlet of the fourth conveying oil passage is arranged in conduction with another oil guiding passage of the second clutch oil passage.

Further, the output shaft oil circuit includes a fifth conveying oil circuit and a sixth conveying oil circuit, and the oil inlet of the fifth conveying oil circuit is connected to an oil passage of the third double-hole oil circuit, so The oil outlet of the fifth conveying oil circuit is arranged in communication with an oil guide passage of the third clutch oil passage, and the oil inlet of the sixth conveying oil passage is connected to another oil passage of the third double-hole oil passage. Conduction setting, the oil outlet of the sixth conveying oil passage is arranged in conduction with another oil guiding passage of the third clutch oil passage.

Further, a first sealing ring is provided on the input shaft on both sides of each oil inlet of the input shaft oil circuit, and a first sealing ring is provided on the input shaft on both sides of each oil inlet of the central shaft oil circuit. A third sealing ring is provided on the input shaft on both sides of each oil inlet of the output shaft oil circuit.

Further, it also includes a common gear, the input shaft is provided with a first input gear, the output shaft is provided with a first output gear, and the common gear is provided on the input shaft between the first input gear and the first output gear and/or on the output shaft.

Further, the intermediate shaft is provided with a second input gear, an input and output gear and a second output gear; the first input gear and the second input gear are arranged in mesh with each other, and the first output gear and the second output gear are mutually meshed. meshing setting, the common gear and the input and output gears are mutually meshed;

The first and second clutches are disposed between the first input gear and the common gear, and the second and second clutches are disposed between the common gear and the first output gear.

Different from the prior art, the power transmission path of the above technical solution is: the input shaft, the first intermediate shaft gear set, the central shaft, the second intermediate shaft gear set and the output shaft, that is, after the power is input through the input shaft, it finally passes through the output shaft. The purpose of shifting gears is achieved through the gear pairs and clutches on each shaft. The first clutch transmits hydraulic oil through the casing oil circuit, the input shaft oil circuit and the first clutch oil circuit, so that the first clutch can perform the clutch operation; similarly, the second clutch passes through the casing oil circuit, The center shaft oil circuit and the second clutch oil circuit deliver hydraulic oil to perform the clutch operation. The third clutch transmits hydraulic oil through the casing oil circuit, the output shaft oil circuit and the third clutch oil circuit of the oil circuit structure, thereby performing the clutch operation. The oil circuit structure is full of hydraulic oil, so after adjusting a small amount of hydraulic oil, the oil pressure balance in the piston chamber of the second clutch can be broken, and then the first clutch, the second clutch and the third clutch can be driven for clutching. operation to achieve the effect of zero-time waiting for switching the clutch.

Description of drawings

1 is a schematic structural diagram of a multi-speed transmission with an oil circuit structure according to a specific embodiment;

2 is a cross-sectional view of a multi-speed transmission with an oil circuit structure according to a specific embodiment;

FIG. 3 is a partial schematic diagram of a multi-speed transmission with an oil circuit structure according to a specific embodiment.

Description of reference numbers:

10. Input shaft; 11. The first input gear; 12. The oil circuit of the input shaft; 121. The first conveying oil circuit;

122. The second oil delivery circuit;

20. Output shaft; 21. First output gear; 22. Output shaft oil circuit;

221, the fifth oil delivery circuit; 222, the sixth oil delivery circuit;

30, gear pair unit; 301, common gear; 302, input and output gear;

40. The first intermediate shaft gear set; 41. The transmission intermediate shaft; 42. The second input gear;

43. Center input gear;

50. The second intermediate shaft gear set; 51. The output intermediate shaft; 52. The central output gear;

53. The second output gear;

60. Central shaft; 61. First central gear; 62. Second central gear; 63. Central shaft oil circuit;

631, the third oil delivery circuit; 632, the fourth oil delivery circuit;

70. The first clutch; 71. The first clutch oil passage; 712, The first oil guide passage;

713, the second oil channel; 72, the first clutch block; 73, the second clutch block; 74, the piston unit;

741, double-headed piston body; 742 cavity; 75, first friction plate group; 76, second friction plate group;

80. Second clutch; 81. Second clutch oil circuit;

90. The third clutch; 91. The third clutch oil circuit;

100, the casing; 101, the casing oil circuit; 1011, the first double-hole delivery oil circuit;

1012, the second double-hole oil delivery circuit; 1013, the third double-hole delivery oil circuit;

01, the first sealing ring; 02, the second sealing ring; 03, the third sealing ring.

Detailed ways

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

Referring to FIG. 1 , FIG. 2 and FIG. 3 , this embodiment provides a multi-speed transmission with an oil circuit structure, including a housing 100 , an input shaft 10 , an output shaft 20 , a gear pair unit 30 , and a first countershaft gear set 40. The second intermediate shaft gear set 50, the central shaft 60 and the oil circuit structure.

The first input gear 11 is mounted on the input shaft, the first output gear 21 is mounted on the output shaft, and the first sun gear 61 and the second sun gear 62 are mounted on the central shaft. The gear pair unit includes a driving member and a linking member, the driving member is installed on the input shaft and/or the central shaft, and the linking member is installed on the main shaft of the first intermediate shaft gear set, so that the driving member and the linking member form a gear The auxiliary power transmission. The central axis of the input shaft, the central axis of the output shaft and the central axis of the central shaft are collinear, and the central axis of the main shaft of the first countershaft gear set is parallel to the central axis of the input shaft. The central axis of the main shaft is set parallel to the central axis of the output shaft, so the length dimension is reduced compared to the existing transmission in terms of structural arrangement, but the cross-sectional area is not increased, thus reducing the overall volume of the transmission and saving installation Transmission space, and transmission production costs.

A first clutch 70 is provided on the input shaft between the first input gear and the gear pair unit, and the first clutch is used to perform clutch operation on the first input gear and the gear pair unit. A second clutch 80 is provided on the central shaft between the gear pair unit and the first sun gear, and the second clutch is used to perform clutch operation on the gear pair unit and the first sun gear. A third clutch 90 is provided on the output shaft between the second sun gear and the first output gear, and the third clutch is used to perform clutch operation on the second sun gear and the first output gear. At the same time, regardless of the closed state of the first clutch, the second clutch and the third clutch, the transmission will only have one gear output, thus realizing the only path for power transmission. During the process, the gear switch is automatically realized, and the uninterrupted power transmission is also realized, which improves the power transmission efficiency.

In this embodiment, the first clutch, the second clutch and the third clutch can be any clutches such as friction clutches, hydraulic torque converters (hydraulic couplings), pneumatic clutches, dog clutches, synchronizers, or electromagnetic clutches. structure. Each clutch has two clutch ends. For example, the first clutch performs a clutching or closing operation through the first input gear of the first clutch end, and the first clutch performs a clutching or closing operation on the common gear 301 through the second clutch end, so as to realize the clutching or closing operation of the two clutches. clutch operation of a gear pair.

In this embodiment, the first clutch includes a first clutch block 72, a second clutch block 73 and a piston unit 74. The piston unit includes a double-headed piston body 741 and a cavity 742. The cross-section of the double-headed piston body is an I-shaped, double-headed piston body The structure of the head piston body is composed of three ring bodies, so the double head piston body is installed in the cavity, and the movement of the double head piston body in the cavity is controlled by inputting hydraulic oil, so that one end of the clutch is in a closed state, and the other end is closed. It is the clutch operation in the off state.

In this embodiment, the first friction plate group 75 and the second friction plate group 76 are arranged in the same structure, and they can be composed of friction plates and steel plates or friction plates and friction plates. In this embodiment, friction plates and steel plates are used as an example to illustrate . The friction plate is installed on the clutch block, and the steel plate is installed on the outer side of the cavity; on the contrary, the friction plate can also be installed on the outer side of the cavity, and the steel plate is installed on the clutch block to form the friction plate and the outer surface of the cavity. The effect of contact and friction between the steel sheets, so as to perform the clutch operation on the gear connected to the other end of the clutch block.

The oil circuit structure in this embodiment includes a casing oil circuit 101 , an input shaft oil circuit 12 , an output shaft oil circuit 22 , a central shaft oil circuit 63 , a first clutch oil circuit 71 , a second clutch oil circuit 81 and a third clutch oil circuit 91. The casing oil circuit is arranged in the casing, the input shaft oil circuit is arranged in the input shaft, and the first branch of the casing oil circuit is arranged in conduction with the input shaft oil circuit; the central shaft The oil circuit is arranged in the central shaft, and the second branch of the casing oil circuit is arranged in communication with the central shaft oil circuit; the output shaft oil circuit is arranged in the output shaft, and the third branch of the casing oil circuit The branch circuit is connected with the output shaft oil circuit. The first clutch oil circuit is arranged in the first clutch, and the input shaft oil circuit is connected to the first clutch oil circuit; the second clutch oil circuit is arranged in the second clutch, and the center shaft oil The third clutch oil passage is arranged in the third clutch, and the output shaft oil passage is arranged in conduction with the third clutch oil passage.

The casing oil circuit includes a first double-hole delivery oil circuit 1011, a second double-hole delivery oil circuit 1012 and a third double-hole delivery oil circuit 1013, and the first clutch oil circuit includes a first oil guide passage 712 and a second oil guide passage 713. The input shaft oil circuit includes a first oil delivery circuit 121 and a second oil delivery circuit 122, the central shaft oil circuit includes a third delivery oil circuit 631 and a fourth oil delivery circuit 632, and the output shaft oil circuit includes a The fifth delivery oil passage 221 and the sixth delivery oil passage 222 . Specifically, hydraulic oil is injected into one side of the cavity through the first oil guide channel, and hydraulic oil is also injected into the other side of the cavity through the second oil guide channel, so that the double-headed piston body is under pressure at both ends of the cavity. In the same way, the double-headed piston body is kept in balance in the cavity to reach the initial ready state.

The oil inlet of the first oil conveying circuit is arranged in communication with an oil passage of the first double-hole oil conveying passage, and the oil outlet of the first oil conveying passage is arranged in communication with the first oil guiding passage, The oil inlet of the second oil delivery passage is arranged in communication with another oil passage of the first double-hole oil passage, and the oil outlet of the second oil delivery passage is arranged in conduction with the second oil guide passage. The oil inlet of the third oil delivery circuit is connected to an oil passage of the second double-hole oil passage, and the oil outlet of the third oil delivery circuit is connected to an oil guide passage of the second clutch oil passage. Conduction setting, the oil inlet of the fourth oil delivery circuit is connected to another oil passage of the second double-hole oil circuit, and the oil outlet of the fourth oil delivery circuit is connected to the second clutch oil circuit. The other oil guide channel is set in conduction. The oil inlet of the fifth conveying oil circuit is connected to an oil passage of the third double-hole oil passage, and the oil outlet of the fifth conveying oil passage is connected to an oil guide passage of the third clutch oil passage. Conduction setting, the oil inlet of the sixth oil passage is connected to another oil passage of the third double-hole oil passage, and the oil outlet of the sixth oil passage is connected to the third clutch oil passage. The other oil guide channel is set in conduction.

In this embodiment, there is only one clutch on the input shaft, so only two oil passages are required to transport hydraulic oil respectively. When the first clutch is operated on and off, the hydraulic oil is input into the cavity of the first clutch through the casing oil circuit, the input shaft oil circuit and the first clutch oil circuit, that is, the delivery of the hydraulic oil is completed.

Specifically, there are two oil passages between the housing, the input shaft and the first clutch. The first double-hole delivery oil circuit of the housing oil circuit has two oil passages, and the hydraulic oil is delivered to the input shaft through the first double-hole delivery oil circuit, while the input shaft oil circuit passes through the first delivery oil circuit and the second The conveying oil passages are conveyed separately, and are respectively connected to the two oil passages of the first double-hole conveying oil passage, and the first clutch oil passage is electrically connected to the first conveying oil passage through the first oil guiding passage, The second oil guiding passage is connected with the second oil conveying passage, and the hydraulic oil is conveyed to both sides of the cavity respectively, so as to accomplish the purpose of conveying the hydraulic oil from the housing to the first and second clutches. In the same way, the oil circuit setting principle for the hydraulic oil delivery of the second clutch on the central shaft is the same, that is, the hydraulic oil is transported through the second double-hole delivery oil circuit of the casing oil circuit, the central shaft oil circuit and the second clutch oil circuit. into the cavity of the second clutch. The oil circuit setting principle of the hydraulic oil delivery of the third clutch on the output shaft is the same, that is, the hydraulic oil is delivered to the third clutch through the third double-hole delivery oil circuit of the casing oil circuit, the output shaft oil circuit and the third clutch oil circuit. Inside the cavity of the three clutches.

At the connection between the first double-hole conveying oil circuit of the casing oil circuit and the oil circuit of the input shaft, two annular oil inlet grooves are opened on the input shaft there, and then the two sides of the oil inlet groove are separated by the first sealing ring 01. For sealing, that is, the sealing ring is located between the casing and the input shaft to seal, and each first double-hole conveying oil passage has an oil inlet groove for conducting connection. Between the input shaft and the inner hole of the first clutch, it is connected by interference fit. At the same time, an annular oil groove is also used to connect the input shaft oil passage with the first oil guide and the second oil guide respectively. Conduction, and then respectively deliver hydraulic oil to both sides of the cavity, to achieve the purpose of controlling the double-headed piston body to move in the cavity through the oil pressure of the hydraulic oil. The second sealing ring 02 is provided at the connection between the second dual-hole conveying oil circuit and the central shaft oil circuit, and the third sealing ring 03 is provided at the connection between the third dual-hole conveying oil circuit and the output shaft oil circuit. The arrangement structure of the second sealing ring and the third sealing ring is the same as that of the first sealing ring.

In this embodiment, the first clutch block is connected to the input gear of the input shaft, and the second clutch block is connected to the common gear, so the first clutch can interact with the first gear pair of the input shaft and the second gear pair of the common gear. Repel clutch control. In this embodiment, the first oil guide channel pushes the double-headed piston body to move toward the common gear after oil intake as an example, and the second oil guide channel pushes the double-headed piston body to move toward the first input gear direction after oil intake.

The oil circuit in the transmission can use the hydraulic oil pump to transport the hydraulic oil in the oil tank to different pipelines. For example, when the first gear pair is required to be in the closed state, the hydraulic oil is transported through the other oil passage of the first double-hole conveying oil passage, the second conveying oil passage of the input shaft oil passage, and the route of the second oil guiding passage. The double-headed piston bodies of the first and second clutches are moved toward the first gear pair. The first friction plate group is pushed by the double-headed piston body for combined friction, and the power is transmitted from the input shaft to the first input gear through the first clutch block, so that the first gear pair is in a closed state, that is, the first input gear and the first input gear are in a closed state. The two input gears are meshed to transmit power from the input shaft to the intermediate shaft. At this time, the distance between the first dual clutch and the second gear pair is in a disengaged state.

Similarly, when the second gear pair is in the closed state, the hydraulic oil is transported through the first oil passage of the first double-hole conveying oil passage, the first conveying oil passage of the input shaft oil passage and the route of the first oil guiding passage, so that the The double-ended piston body of a second clutch moves toward the second gear pair. The double-headed piston body pushes the second friction plate group for combined friction, and the power is transmitted from the input shaft to the common gear through the second clutch block, so that the second gear pair is in a closed state, that is, the common gear meshes with the input and output gears , which transmits power from the input shaft to the intermediate shaft. At this time, the distance between the first and second clutches and the first gear pair is in a disengaged state.

Similarly, the second clutch is used in the same way as the first clutch. That is, the second clutch transmits the hydraulic oil to the second clutch through the second double-hole delivery oil circuit, the output shaft oil circuit and the second oil guide passage, that is, the two oil passages of the second double-hole delivery oil circuit, the output shaft oil The third and fourth oil conveying passages of the oil passage and the two oil passages of the second oil guiding passage are respectively connected and conducted, thereby forming two mutually independent oil conveying pipes, so as to achieve the connection between the second gear pair and the third gear pair. The purpose of the vice for mutual exclusive clutch control.

Specifically, in this embodiment, the oil inlet of the first oil conveying circuit is arranged in communication with an oil passage of the first double-hole oil passage, and the oil outlet of the first oil conveying passage is connected to the first oil guiding passage. The oil inlet of the second oil conveying passage is arranged in communication with another oil passage of the first double-hole oil passage, and the oil outlet of the second oil conveying passage is arranged in communication with the second oil guiding passage. In the same way, the oil inlet of the third oil conveying circuit is connected to an oil passage of the second dual-hole oil passage, and the oil outlet of the third conveying oil passage is connected to the first oil guiding passage of the second clutch oil passage. Conduction setting, the oil inlet of the fourth delivery oil circuit is connected to another oil passage of the second double-hole oil circuit, and the oil outlet of the fourth delivery oil circuit is connected with the second oil guide of the second clutch oil circuit. Phase conduction setting. Therefore, each clutch has two independent oil pipelines for delivering hydraulic oil.

In this embodiment, the oil circuit structure of the transmission all works in a state of being filled with hydraulic oil. Therefore, only after the hydraulic oil is injected into the cavity again, the oil pressure in the cavity will be unbalanced, and the double-headed piston body will be driven to move in the cavity. , and the first or second friction plate group is driven and frictionally combined by the double-headed piston body to achieve the effect of clutching. The preparation time of the driving double-headed piston body to move is zero, and the effect of waiting for switching the clutch for zero time is achieved, and the waiting time of the clutch structure when the clutch is switched is shortened.

In this embodiment, the first intermediate shaft gear set includes a transmission intermediate shaft 41, a second input gear 42 and a central input gear 43, and the gear pair unit includes a common gear 301 and an input and output gear 302, and the input and output gears are installed on the transmission intermediate shaft. , the second input gear and the central input gear are arranged on the transmission intermediate shaft in turn, the second input gear is arranged in mesh with the first input gear, and the central input gear is arranged in mesh with the first central gear. The common gear is arranged on the input shaft and/or the central shaft, and the common gear is located between the first input gear and the first sun gear, the input and output gears are located between the second input gear and the center input gear, and the input and output gears are connected with the common gear. meshing settings.

Specifically, the first transmission path is as follows: the first input gear is operated in the closed state through the first clutch, and the shared gear is operated in the off state, so that the power of the input shaft passes through the gears of the first input gear and the second input gear Auxiliary incoming transmission intermediate shaft. In this embodiment, the first oil guide channel pushes the double-headed piston body to move toward the common gear after oil intake as an example, and the second oil guide channel pushes the double-headed piston body to move toward the first input gear direction after oil intake. At the same time, the common gear is operated in the closed state through the second clutch, and the first central gear is operated in the off state, so that the power on the transmission intermediate shaft is transmitted to the central shaft through the common gear and the gear pair of the input and output gears. In this embodiment, an oil guide of the second clutch pushes the double-headed piston body to move toward the first sun gear after oil is fed in as an example, then another oil guide of the second clutch pushes the double-headed piston after oil is fed The body moves in the direction of the common gear.

The second transmission path is: the first input gear is operated in the closed state through the first clutch, and the shared gear is operated in the off state, so that the power of the input shaft is transmitted through the gear pair of the first input gear and the second input gear. Transmission intermediate shaft. In this embodiment, the first oil guide channel pushes the double-headed piston body to move toward the common gear after oil intake as an example, and the second oil guide channel pushes the double-headed piston body to move toward the first input gear direction after oil intake. At the same time, the common gear is operated in an off state through the second clutch, and the first sun gear is operated in a closed state, so that the power on the transmission intermediate shaft is transmitted to the central shaft through the gear pair of the central input gear and the first sun gear. In this embodiment, an oil guide of the second clutch pushes the double-headed piston body to move toward the common gear after oil is fed in as an example. The first sun gear moves in the direction.

The third transmission path is: the first input gear is operated in the off state through the first clutch, and the common gear is operated in the closed state, so that the power of the input shaft is transmitted to the transmission intermediate shaft through the gear pair of the common gear and the input and output gears . In this embodiment, the first oil guide passage pushes the double-headed piston body to move toward the first input gear after oil is fed in as an example, and the second oil guide passage pushes the double-headed piston body to move towards the common gear after oil is fed. At the same time, the common gear is operated in the closed state through the second clutch, and the first central gear is operated in the off state, so that the power on the transmission intermediate shaft is directly transmitted to the central shaft through the common gear. In this embodiment, an oil guide of the second clutch pushes the double-headed piston body to move toward the first sun gear after oil is fed in as an example, then another oil guide of the second clutch pushes the double-headed piston after oil is fed The body moves in the direction of the common gear.

The fourth transmission path is as follows: the first input gear is operated in an off state by the first clutch, and the common gear is operated in an on state; meanwhile, the second clutch is operated in an off state on the common gear, and the first sun gear is in an on state. state operation, so that the power of the input shaft is directly transmitted to the central shaft. In this embodiment, the first oil guide passage pushes the double-headed piston body to move toward the first input gear after oil is fed in as an example, and the second oil guide passage pushes the double-headed piston body to move towards the common gear after oil is fed. An oil guide of the second clutch pushes the double-headed piston body to move toward the common gear after oil intake, and another oil guide of the second clutch pushes the double-headed piston body to move toward the first sun gear after oil intake. That is, the power is transmitted to the transmission intermediate shaft through the gear pair of the shared gear and the input and output gears, and then the power is transmitted to the central shaft through the gear pair of the central input gear and the first central gear.

Because the input and output gears mesh with the common gear to form a gear pair, the second input gear meshes with the first input gear to form a gear pair, the central input gear meshes with the first central gear to form a gear pair, and the three sets of gear pairs The gear ratios vary. Therefore, when the power is transmitted to the central shaft, the rotational speed of the central shaft has four types, so as to achieve the purpose of changing the four rotational speeds of the three sets of gear pairs.

The oil circuit in the transmission can use the hydraulic oil pump to transport the hydraulic oil in the oil tank to different pipelines. For example, when the first gear pair is required to be in the closed state, the hydraulic oil is transported through the other oil passage of the first double-hole conveying oil passage, the second conveying oil passage of the input shaft oil passage, and the route of the second oil guiding passage. The double-headed piston bodies of the first and second clutches are moved toward the first gear pair. The first friction plate group is pushed by the double-headed piston body for combined friction, and the power is transmitted from the input shaft to the first input gear through the first clutch block, so that the first gear pair is in a closed state, that is, the first input gear and the first input gear are in a closed state. The two input gears are meshed to transmit power from the input shaft to the intermediate shaft. At this time, the distance between the first dual clutch and the second gear pair is in a disengaged state.

Similarly, when the second gear pair is in the closed state, the hydraulic oil is transported through the first oil passage of the first double-hole conveying oil passage, the first conveying oil passage of the input shaft oil passage and the route of the first oil guiding passage, so that the The double-ended piston body of a clutch moves toward the second gear pair. The double-headed piston body pushes the second friction plate group for combined friction, and the power is transmitted from the input shaft to the common gear through the second clutch block, so that the second gear pair is in a closed state, that is, the common gear meshes with the input and output gears , which transmits power from the input shaft to the intermediate shaft. At this time, the distance between the first clutch and the first gear pair is in a disengaged state.

Similarly, the second clutch and the third clutch are used in the same manner as the first and second clutches.

Specifically, in this embodiment, the oil inlet of the first oil conveying circuit is arranged in communication with an oil passage of the first double-hole oil passage, and the oil outlet of the first oil conveying passage is connected to the first oil guiding passage. The oil inlet of the second oil conveying passage is arranged in communication with another oil passage of the first double-hole oil passage, and the oil outlet of the second oil conveying passage is arranged in communication with the second oil guiding passage. In the same way, the oil inlet of the third oil conveying circuit is connected to an oil passage of the second dual-hole oil passage, and the oil outlet of the third conveying oil passage is connected to the first oil guiding passage of the second clutch oil passage. Conduction setting, the oil inlet of the fourth delivery oil circuit is connected to another oil passage of the second double-hole oil circuit, and the oil outlet of the fourth delivery oil circuit is connected with the second oil guide of the second clutch oil circuit. Phase conduction setting. Therefore, each clutch has two independent oil pipelines for delivering hydraulic oil.

In this embodiment, the power on the central shaft is output through the second intermediate shaft gear set and the output shaft, or the output shaft is directly output to realize gear switching. The second intermediate shaft gear set includes an output intermediate shaft 51, a central output gear 52 and a second output gear 53. The central output gear and the second output gear are sequentially arranged on the output intermediate shaft, and the central output gear meshes with the second central gear. The second output gear is arranged in mesh with the first output gear. There is a gear pair of the second sun gear and the central output gear, and a gear pair of the second output gear and the first output gear. Therefore, in combination with the second sun gear on the central shaft, there are two power transmission paths between the second counter shaft gear set and the output shaft.

Specifically, because the second sun gear is always engaged with the central output gear for transmission, the output intermediate shaft of the third clutch will be driven to rotate no matter what state the third clutch is in. Therefore, the first transmission path is as follows: when the third clutch is used to operate the second sun gear in an engaged state, and when the first output gear is operated in an off state, the power on the central shaft is directly transmitted to the output shaft. The second transmission path is: when the second sun gear is operated in an off state through the third clutch, and when the first output gear is operated in an on state, the power on the second countershaft gear set is connected with the first output gear through the second output gear. The gear pair of the output gear is passed into the output shaft. And because the gear ratio between the second sun gear and the central output gear is different from the gear ratio between the second output gear and the first output gear, the output shaft has two kinds of rotation speed switching. For the oil feeding methods of the two oil guide passages of the third clutch, refer to the above-mentioned oil feeding methods of the oil guide passages of the first clutch and the second clutch.

It can be seen from the above that the entire transmission may have five sets of gear pairs or six sets of gear pairs, and the gear ratios of any two sets of gear pairs of the five sets of gear pairs or six sets of gear pairs are not equal, and the gear ratios in this embodiment are all The gear ratio of the driving gear and the driven gear is combined with the above-mentioned four kinds of speed switching of the input shaft, the first intermediate shaft gear set and the central shaft, so that the output shaft has eight kinds of rotation transformations, and the speed of the input shaft is not equal. The purpose is equal to the rotation speed of the output shaft, and the entire transmission achieves the effect of switching with eight gears.

In the above embodiment, the number of the transmission intermediate shaft and the output intermediate shaft may be multiple, such as two, three or four. A plurality of transmission intermediate shafts and output intermediate shafts can be arranged around the input shaft and output shaft respectively. For example, two transmission intermediate shafts can be respectively set at the upper and lower positions of the input shaft, and two output intermediate shafts can be respectively set at the upper and lower positions of the output shaft. In the upper and lower positions, the structure of multiple transmission intermediate shafts or output intermediate shafts should be the same, such as being provided with the same gears. In this way, through multiple transmission intermediate shafts and output intermediate shafts, the load of the input shaft and the output shaft can be distributed, and the bending strength of the input shaft, the transmission intermediate shaft, the output intermediate shaft and the output shaft can be enhanced, thereby improving the input shaft and the output shaft. The bearing capacity of the output shaft can achieve the purpose of high load.

This embodiment also includes a casing 100, through which the input shaft, the output shaft, the central shaft, the first intermediate shaft gear set, the second intermediate shaft gear set, the input shaft, the output shaft and the gear pair on the central shaft are sealed accommodate. Prevent external dust, water vapor, etc. from entering the casing, and improve the service life of the transmission.

It should be noted that, although the above embodiments have been described herein, it does not limit the scope of the 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 structures or equivalent process transformations made by using the contents of the description and drawings of the present invention, directly or indirectly apply the above technical solutions In other related technical fields, all are included in the protection scope of the patent of the present invention.

Claims (10)

1. A multi-speed transmission with an oil circuit structure, characterized in that: it comprises an input shaft, an output shaft, a gear pair unit, a first countershaft gear set, a second countershaft gear set, a central shaft and an oil passage structure; The input shaft is provided with a first input gear, the output shaft is provided with a first output gear, the central shaft is provided with a first central gear and a second central gear, and the driving member of the gear pair unit is provided on the input shaft. and/or on the central shaft, and the gear pair unit is located between the first input gear and the first sun gear; The linkage member of the gear pair unit is arranged on the main shaft of the first countershaft gear set, and the first countershaft gear set is used for meshing with the first input gear, the driving member of the gear pair unit and the first sun gear respectively A gear pair transmission is formed, and the second intermediate shaft gear set is used for meshing with the second central gear and the first output gear to form a gear pair transmission; The gear pair unit is used for transmitting the power of the input shaft to the first countershaft gear set and/or transmitting the power on the first countershaft gear set to the center shaft; A first clutch is arranged on the input shaft between the first input gear and the gear pair unit, the first clutch end of the first clutch is arranged on the first input gear, and the second clutch end of the first clutch Set on the gear pair unit; A second clutch is arranged on the central shaft between the gear pair unit and the first sun gear, the first clutch end of the second clutch is arranged on the gear pair unit, and the second clutch end of the second clutch is arranged on the first sun gear; A third clutch is set on the output shaft between the second sun gear and the first output gear, the first clutch end of the third clutch is set on the second sun gear, and the second clutch of the third clutch is set on the second sun gear. The end is arranged on the first output gear; The rotational speed of the input shaft is greater than, equal to or less than the rotational speed of the output shaft; The oil circuit structure includes a casing oil circuit, an input shaft oil circuit, an output shaft oil circuit, a central shaft oil circuit, a first clutch oil circuit, a second clutch oil circuit and a third clutch oil circuit. is arranged in the casing, the input shaft oil circuit is arranged in the input shaft, the first branch of the casing oil circuit is arranged in conduction with the input shaft oil circuit; the central shaft oil passage is arranged in the central shaft, The second branch of the casing oil circuit is connected to the central shaft oil circuit; the output shaft oil circuit is arranged in the output shaft, and the third branch of the casing oil circuit is connected to the output shaft oil circuit The first clutch oil circuit is arranged in the first clutch, and the input shaft oil circuit is connected with the first clutch oil circuit; the second clutch oil circuit is arranged in the second clutch, so The central shaft oil circuit is arranged in conduction with the second clutch oil passage; the third clutch oil passage is arranged in the third clutch, and the output shaft oil passage is arranged in conduction with the third clutch oil passage. 2 . The multi-speed transmission with an oil circuit structure according to claim 1 , wherein the casing oil circuit comprises a first dual-hole oil delivery circuit, a second dual-hole transmission oil circuit and a third dual-hole transmission oil circuit. 3 . A hole conveying oil circuit, the oil inlet of the first double-hole conveying oil circuit, the oil inlet of the second double-hole conveying oil circuit and the oil inlet of the third double-hole conveying oil circuit are arranged on the outer side of the casing , the oil outlet of the first double-hole conveying oil passage is arranged on the inner surface of the shaft hole of the input shaft, the oil outlet of the second double-hole conveying oil passage is arranged on the inner face of the shaft hole of the central shaft, and the first The oil outlet of the three-double-hole conveying oil passage is arranged on the inner surface of the shaft hole of the output shaft. 3 . The multi-speed transmission with an oil circuit structure according to claim 2 , wherein the first clutch oil circuit comprises a first oil guide passage and a second oil guide passage; 3 . The first oil guide passage is arranged between one side of the inner cavity of the piston of the clutch and the inner side of the inner hole of the clutch, and the second oil passage is arranged between the other side of the inner cavity of the piston of the clutch and the inner side of the inner hole of the clutch ; The second clutch oil passage and the third clutch oil passage are arranged in the same structure as the first clutch oil passage. 4. The multi-speed transmission with an oil circuit structure according to claim 3, wherein the first clutch comprises a first clutch block, a second clutch block and a piston unit; The piston unit includes a double-headed piston body and a cavity, the cross-section of the double-headed piston body is I-shaped, one end of the double-headed piston body is arranged in the cavity, and the other end of the double-headed piston body is located in the cavity. The oil outlet of the first oil guide passage is arranged on one side of the cavity, and the oil outlet of the second oil guide passage is arranged on the other side of the cavity; The first clutch block includes a first friction plate group, the second clutch block includes a second friction plate group, the first friction plate group is located on one side of the other end of the double-headed piston body, and the second The friction plate group is located on the other side of the other end of the double-headed piston body, the first clutch block and the second clutch block are used to be arranged on the gear pair, and the double-headed piston body is used to drive the first friction plate group. Or one group of the second friction plate group is combined and the other group is separated; The second clutch and the third clutch are arranged in the same structure as the first clutch. 5 . The multi-speed transmission with an oil circuit structure according to claim 3 , wherein the input shaft oil circuit comprises a first conveying oil circuit and a second conveying oil circuit, and the first conveying oil circuit The oil inlet of the first oil channel is connected to an oil channel of the first double-hole oil delivery channel, the oil outlet of the first oil channel is connected to the first oil channel, and the second oil channel is connected to the first oil channel. The oil inlet of the first two-hole oil passage communicates with the other oil passage of the first double-hole oil passage, and the oil outlet of the second oil delivery passage communicates with the second oil guide passage. 6 . The multi-speed transmission with an oil circuit structure according to claim 3 , wherein the central shaft oil circuit comprises a third oil conveying circuit and a fourth oil conveying circuit, and the third conveying oil circuit The oil inlet of the second clutch oil circuit is connected to an oil passage of the second double-hole oil circuit, and the oil outlet of the third oil delivery circuit is connected to an oil guide passage of the second clutch oil circuit. The oil inlet of the fourth oil passage is connected to another oil passage of the second double-hole oil passage, and the oil outlet of the fourth oil passage is connected to another oil passage of the second clutch oil passage. pass settings. 7 . The multi-speed transmission with an oil circuit structure according to claim 3 , wherein the output shaft oil circuit comprises a fifth conveying oil circuit and a sixth conveying oil circuit, and the fifth conveying oil circuit The oil inlet of the third clutch oil circuit is connected to an oil passage of the third double-hole oil circuit, and the oil outlet of the fifth transmission oil circuit is connected to an oil guide passage of the third clutch oil circuit. The oil inlet of the sixth oil conveying circuit is connected with another oil passage of the third double-hole oil passage, and the oil outlet of the sixth conveying oil passage is connected with another oil guiding passage of the third clutch oil passage. pass settings. 8 . The multi-speed transmission with an oil circuit structure according to claim 1 , wherein the input shaft on both sides of each oil inlet of the input shaft oil circuit is provided with a first sealing ring, so the A first sealing ring is provided on the input shaft on both sides of each oil inlet of the central shaft oil circuit, and a third sealing ring is provided on the input shaft on both sides of each oil inlet of the output shaft oil circuit. 9 . The multi-speed transmission with an oil circuit structure according to claim 1 , further comprising a common gear, the input shaft is provided with a first input gear, and the output shaft is provided with a first output gear. 10 . , the common gear is arranged on the input shaft and/or the output shaft between the first input gear and the first output gear. 10 . The multi-speed transmission with an oil circuit structure according to claim 1 , wherein: the intermediate shaft is provided with a second input gear, an input and output gear and a second output gear; the first input gear The second input gear is meshed with each other, the first output gear and the second output gear are meshed with each other, and the common gear is meshed with the input and output gears; The first and second clutches are disposed between the first input gear and the common gear, and the second and second clutches are disposed between the common gear and the first output gear.

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