A transmission with oil circuit structure

Abstract

The present invention provides a transmission with an oil circuit structure, including an input shaft, an output shaft, an intermediate shaft, a first switching dual clutch, a second switching dual clutch, a housing and an oil circuit structure, wherein the oil circuit structure includes a housing oil circuit, an input shaft oil circuit, an output shaft oil circuit, a first clutch oil circuit and a second clutch oil circuit. The first switching dual clutch transmits hydraulic oil through the housing oil circuit, the input shaft oil circuit and the first clutch oil circuit to perform a clutch operation of the first switching dual clutch; similarly, the second switching dual clutch transmits hydraulic oil through the housing oil circuit, the output shaft oil circuit and the second clutch oil circuit of the oil circuit structure to perform a clutch operation. The oil circuit structure is full of hydraulic oil, so only a small amount of hydraulic oil needs to be adjusted to break the oil pressure balance in the piston chamber of the switching dual clutch, and then drive the switching dual clutch to perform a clutch operation, achieving the effect of zero waiting time for switching clutch.

Description

Technical Field

[0001] The invention relates to the field of transmissions, and in particular to a transmission with an oil circuit structure. Background Art

[0002] The transmission is a set of speed-changing devices used to coordinate the speed of the engine and / or motor and the actual driving speed of the wheels, so as to bring out the best performance of the engine and / or motor. The transmission can produce different speed ratios between the engine and / or motor and the wheels during the driving of the vehicle. However, in the existing four-speed vehicles, the four-speed transmission needs to be meshed through four or more gear sets, resulting in a larger size of the existing transmission. In addition, the power transmission path of the existing four-speed transmission is not unique, and the shifting mechanism is mostly a synchronizer or fork structure. When switching gears, the switching time gap is relatively long. Summary of the invention

[0003] Therefore, it is necessary to provide a compact transmission structure to solve the problem of long switching time gap when changing gears in the existing transmission.

[0004] To achieve the above-mentioned purpose, the inventor provides a transmission with an oil circuit structure, comprising an input shaft, an output shaft, an intermediate shaft, a first switching dual clutch, a second switching dual clutch, a housing and an oil circuit structure; the center line of the input shaft and the center line of the output shaft are arranged in a colinear manner, and the input end of the input shaft and the output end of the output shaft respectively penetrate the opposite side walls of the housing and are arranged in the housing, the input shaft is transmission-connected with the input end of the intermediate shaft, the output end of the intermediate shaft is transmission-connected with the output shaft, and the center line of the intermediate shaft is parallel to the center line of the input shaft and is arranged in the housing; the first switching dual clutch is arranged on the input shaft, and the second switching dual clutch is arranged on the output shaft, the first switching dual clutch is located between two adjacent gear pairs on the input shaft and the output shaft, and the second switching dual clutch is located at the input The first switching double clutch and the second switching double clutch are used to control the gear pairs on both sides of the switching double clutch to perform mutually exclusive clutching operations; the oil circuit structure includes a housing oil circuit, an input shaft oil circuit, an output shaft oil circuit, a first clutch oil circuit and a second clutch oil circuit, the housing oil circuit is arranged in the housing, the input shaft oil circuit is arranged in the input shaft, and one branch of the housing oil circuit is connected to the input shaft oil circuit; the output shaft oil circuit is arranged in the output shaft, and the other branch of the housing oil circuit is connected to the output shaft oil circuit; the first clutch oil circuit is arranged in the first switching 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 switching clutch, and the output shaft oil circuit is connected to the second clutch oil circuit.

[0005] Further, the housing oil circuit includes a first double-hole oil delivery circuit and a second double-hole oil delivery circuit, the oil inlet of the first double-hole oil delivery circuit and the oil inlet of the second double-hole oil delivery circuit are arranged on the outer side surface of the housing, the oil outlet of the first double-hole oil delivery circuit is arranged on the inner surface of the shaft hole of the housing input shaft, and the oil outlet of the second double-hole oil delivery circuit is arranged on the inner surface of the shaft hole of the housing output shaft.

[0006] Furthermore, the first clutch oil circuit includes a first oil guide channel and a second oil guide channel; the first oil guide channel is arranged between one side of the clutch piston inner cavity and the inner side surface of the clutch inner hole, and the second oil guide channel is arranged between the other side of the clutch piston inner cavity and the inner side surface of the clutch inner hole; the second clutch oil circuit has the same structural arrangement as the first clutch oil circuit.

[0007] Furthermore, the first switching dual clutch comprises a first clutch block, a second clutch block and a piston unit; the piston unit comprises a double-headed piston body and a cavity, the cross-section of the double-headed piston body is an I-shape, 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 outside the cavity, the oil outlet of the first oil guide channel is arranged on one side of the cavity, and the oil outlet of the second oil guide channel is arranged on the other side of the cavity; the first clutch block comprises a first friction plate group, and the second clutch block comprises 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 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 a gear pair, and the double-headed piston body is used to drive one of the first friction plate group or the second friction plate group to engage and the other to separate; the second switching clutch has the same structural arrangement as the first switching clutch.

[0008] Further, the input shaft oil circuit includes a first oil delivery circuit and a second oil delivery circuit, the oil inlet of the first oil delivery circuit is connected to one oil channel of the first double-hole oil circuit, the oil outlet of the first oil delivery circuit is connected to the first oil guide channel, the oil inlet of the second oil delivery circuit is connected to the other oil channel of the first double-hole oil circuit, and the oil outlet of the second oil delivery circuit is connected to the second oil guide channel.

[0009] Further, the output shaft oil circuit includes a third oil delivery circuit and a fourth oil delivery circuit, the oil inlet of the third oil delivery circuit is connected to one oil channel of the second double-hole oil circuit, the oil outlet of the third oil delivery circuit is connected to the first oil guide channel of the second clutch oil circuit, the oil inlet of the fourth oil delivery circuit is connected to the other oil channel of the second double-hole oil circuit, and the oil outlet of the fourth oil delivery circuit is connected to the second oil guide channel of the second clutch oil circuit.

[0010] Furthermore, 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 second sealing ring is provided on the input shaft on both sides of each oil inlet of the output shaft oil circuit.

[0011] Furthermore, a plurality of intermediate shafts are provided, and the plurality of intermediate shafts are arranged in a circular array around the central axis of the input shaft in the housing.

[0012] Furthermore, 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 and / or the output shaft between the first input gear and the first output gear.

[0013] Furthermore, the intermediate shaft is provided with a second input gear, an input-output gear and a second output gear; the first input gear and the second input gear are meshed with each other, the first output gear and the second output gear are meshed with each other, and the common gear and the input-output gear are meshed with each other; the first switching dual clutch is arranged between the first input gear and the common gear, and the second switching dual clutch is arranged between the common gear and the first output gear.

[0014] Different from the prior art, the transmission of the above technical solution controls the gear shift through a switchable dual clutch, so that the power can be output through the input shaft, the intermediate shaft and the output shaft, or directly output through the input shaft and the output shaft. The first switchable dual clutch delivers hydraulic oil through the housing oil circuit, the input shaft oil circuit and the first clutch oil circuit, thereby enabling the first switchable dual clutch to perform a clutch operation; similarly, the second switchable dual clutch delivers hydraulic oil through the housing oil circuit, the output shaft oil circuit and the second clutch oil circuit of the oil circuit structure, thereby performing a clutch operation. The oil circuit structure is full of hydraulic oil, so only a small amount of hydraulic oil needs to be adjusted to break the oil pressure balance in the piston chamber of the switchable dual clutch, and then drive the switchable dual clutch to perform a clutch operation, achieving the effect of zero waiting time for switching the clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of a transmission with an oil circuit structure according to a specific embodiment;

[0016] Figure 2 A structural diagram of a transmission with an oil circuit structure according to a specific embodiment;

[0017] Figure 3 It is a partial schematic diagram of a transmission with an oil circuit structure according to a specific embodiment;

[0018] Description of reference numerals:

[0019] 10. Input shaft; 11. First input gear;

[0020] 20. output shaft; 21. first output gear;

[0021] 30. Shared gears;

[0022] 40. Intermediate shaft; 41. Second input gear; 42. Input and output gears;

[0023] 43. Second output gear

[0024] 50. First switchable dual clutch;

[0025] 51. first clutch block; 511. first friction plate group;

[0026] 52, second clutch block; 521, second friction plate group;

[0027] 53. Piston unit; 531. Double-headed piston body; 532. Cavity;

[0028] 60. Second switchable dual clutch;

[0029] 70. Shell;

[0030] 80. Oil circuit structure; 81. Shell oil circuit; 82. Input shaft oil circuit; 83. Output shaft oil circuit;

[0031] 84, first clutch oil circuit; 85, second clutch oil circuit;

[0032] 811, first double-hole oil delivery circuit; 812, second double-hole oil delivery circuit;

[0033] 821, first oil delivery passage; 822, second oil delivery passage; 823, first sealing ring;

[0034] 831, third oil delivery passage; 832, fourth oil delivery passage; 833, second sealing ring;

[0035] 841, first oil guide channel; 842, second oil guide channel; DETAILED DESCRIPTION

[0036] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0037] See also Figure 1 , Figure 2 and Figure 3The present embodiment provides a transmission with an oil circuit structure, comprising an input shaft 10, an output shaft 20, a common gear 30, an intermediate shaft 40, a first switching dual clutch 50, a second switching dual clutch 60, a housing 70 and an oil circuit structure 80. The centerline of the input shaft is colinear with the centerline of the output shaft, and the input end of the input shaft and the output end of the output shaft are respectively arranged in the housing through the opposite side walls of the housing, the input shaft is transmission-connected with the input end of the intermediate shaft, the output end of the intermediate shaft is transmission-connected with the output shaft, the centerline of the intermediate shaft is parallel to the centerline of the input shaft and is arranged in the housing, and the housing can be used to protect the shafts, gears and clutches in the transmission.

[0038] In this embodiment, the input shaft is provided with a first input gear 11, the output shaft is provided with a first output gear 21, the intermediate shaft is provided with a second input gear 41, an input-output gear 42, and a second output gear 43, and the common gear is provided on the input shaft and / or the output shaft between the first input gear and the first output gear. The first input gear and the second input gear are meshed with each other to form a first gear pair, the common gear and the input-output gear are meshed with each other to form a second gear pair, and the first output gear and the second output gear are meshed with each other to form a third gear pair.

[0039] The first switching dual clutch is installed on the input shaft between the first input gear and the common gear, and performs mutually exclusive clutching operation on the first gear pair and the second gear pair; similarly, the second switching dual clutch is installed between the common gear and the first output gear, and performs mutually exclusive clutching operation on the second gear pair and the third gear pair. The mutually exclusive clutching means that when the first gear pair is in the engaged state, the second gear pair is in the disengaged state; conversely, when the second gear pair is in the engaged state, the first gear pair is in the disengaged state. Therefore, the first switching dual clutch and the second switching dual clutch can perform four different routes of power transmission on the first gear pair, the second gear pair and the third gear pair.

[0040] Specifically, because the first switching double clutch and the second switching double clutch are both connected to the second gear pair, the first route is: the power of the input shaft can be directly transmitted to the output shaft through the second gear pair; the corresponding second route is: the input shaft transmits power to the intermediate shaft through the first gear pair, and then transmits it to the output shaft through the third gear pair; the third route is: the input shaft power is transmitted to the intermediate shaft through the second gear pair, and then transmitted to the output shaft through the third gear pair; the fourth route is: the input shaft transmits power to the intermediate shaft through the first gear pair, and then transmits it to the output shaft through the second gear pair. The effect of changing four gear positions with three pairs of gear pairs is achieved.

[0041] In this embodiment, the first switchable dual clutch includes a first clutch block 51, a second clutch block 52 and a piston unit 53. The piston unit includes a double-headed piston body 531 and a cavity 532. The cross-section of the double-headed piston body is an I-shape. The structure of the double-headed piston body is composed of three ring bodies. Therefore, the double-headed piston body is installed in the cavity. The movement of the double-headed piston body in the cavity is controlled by inputting hydraulic oil, thereby achieving a clutch operation in which one end of the switchable dual clutch is in a closed state and the other end is in a disengaged state.

[0042] In this embodiment, the oil circuit structure includes a housing oil circuit 81, an input shaft oil circuit 82, an output shaft oil circuit 83, a first clutch oil circuit 84, and a second clutch oil circuit 85. The housing oil circuit includes a first double-hole delivery oil circuit 811 and a second double-hole delivery oil circuit 812. The first clutch oil circuit includes a first oil guide channel 841 and a second oil guide channel 842. The input shaft oil circuit includes a first oil guide channel 821 and a second oil guide channel 822. The output shaft oil circuit includes a third oil guide channel 831 and a fourth oil guide channel 832. 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 pressures at both ends of the double-headed piston body in the cavity are the same, thereby keeping the double-headed piston body balanced in the cavity and reaching the initial preparation state.

[0043] In this embodiment, there is only one switchable dual clutch on the input shaft, so only two oil passages are needed to transport hydraulic oil. When the first switchable dual clutch is engaged or disengaged, the hydraulic oil is input into the cavity of the first switchable dual clutch through the housing oil passage, the input shaft oil passage and the first clutch oil passage, thus completing the delivery of the hydraulic oil.

[0044] Specifically, there are two oil passages between the housing, the input shaft and the first switching dual clutch. The first double-hole oil delivery passage of the housing oil passage has two oil passages, through which the hydraulic oil is delivered to the input shaft, while the input shaft oil passage is delivered respectively through the first delivery oil passage and the second delivery oil passage, and is respectively connected to the two oil passages of the first double-hole delivery oil passage, while the first clutch oil passage is connected to the first delivery oil passage through the first oil guide passage, and the second oil guide passage is connected to the second delivery oil passage, and the hydraulic oil is delivered to both sides of the cavity respectively, so as to complete the purpose of delivering the hydraulic oil from the housing to the first switching dual clutch. Similarly, the oil passage setting principle of the hydraulic oil delivery of the second switching dual clutch on the output shaft is the same, that is, the hydraulic oil is delivered to the cavity of the second switching dual clutch through the second double-hole oil delivery passage of the housing oil passage, the output shaft oil passage and the second clutch oil passage.

[0045] At the connection between the first double-hole oil delivery circuit of the housing oil circuit and the input shaft oil circuit, two annular oil inlet grooves are opened on the input shaft at that location, and then the two sides of the oil inlet grooves are sealed by sealing rings, that is, the sealing ring is located between the housing and the input shaft for sealing, and each first double-hole oil delivery circuit has an oil inlet groove for conducting connection. Between the input shaft and the inner hole of the first switching dual clutch, an interference fit is used for connection, and an annular oil outlet groove is also used to conduct the input shaft oil circuit with the first oil guide channel and the second oil guide channel, respectively, and then the hydraulic oil is respectively delivered to the two sides of the cavity, so as to achieve the purpose of controlling the double-headed piston body to move in the cavity through the oil pressure of the hydraulic oil.

[0046] 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 switching dual clutch can perform mutually exclusive clutch control on the first gear pair of the input shaft and the second gear pair of the common gear. In this embodiment, taking the first oil guide passage pushing the double-headed piston body toward the common gear direction after oil intake as an example, the second oil guide passage pushes the double-headed piston body toward the first input gear direction after oil intake.

[0047] The oil circuits in the transmission can use a hydraulic oil pump to transport the hydraulic oil in the oil tank to different pipelines. For example, when the first gear pair needs to be in a closed state, the hydraulic oil is transported through the other oil channel of the first double-hole oil delivery circuit, the second oil delivery circuit of the input shaft oil circuit, and the second oil guide channel, so that the double-headed piston body of the first switching dual clutch moves toward the first gear pair. The double-headed piston body pushes the first friction plate group to engage 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 is meshed with the second input gear, and the power is transmitted from the input shaft to the intermediate shaft. At this time, the first switching dual clutch and the second gear pair are in a disengaged state.

[0048] Similarly, when the second gear pair is in the engaged state, the hydraulic oil is transported through the first oil passage of the first double-hole oil delivery passage, the first oil delivery passage of the input shaft oil passage, and the first oil guide passage, so that the double-headed piston body of the first switching dual clutch moves toward the second gear pair. The double-headed piston body pushes the second friction plate group to perform 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 the engaged state, that is, the common gear is meshed with the input and output gears, and the power is transmitted from the input shaft to the intermediate shaft. At this time, the first switching dual clutch and the first gear pair are in the disengaged state.

[0049] Similarly, the second switchable dual clutch is used in the same manner as the first switchable dual clutch, that is, the second switchable dual clutch delivers hydraulic oil to the second switchable dual clutch through the second double-hole delivery oil passage, the output shaft oil passage, and the second oil guide passage, that is, the two oil passages of the second double-hole delivery oil passage, the third delivery oil passage and the fourth delivery oil passage of the output shaft oil passage, and the two oil passages of the second oil guide passage are connected and conducted respectively, thereby forming two independent oil pipelines, so as to achieve the purpose of mutually exclusive clutch control of the second gear pair and the third gear pair.

[0050] Specifically, in this embodiment, the oil inlet of the first oil delivery circuit is connected to an oil passage of the first double-hole oil circuit, the oil outlet of the first oil delivery circuit is connected to the first oil passage, the oil inlet of the second oil delivery circuit is connected to another oil passage of the first double-hole oil circuit, and the oil outlet of the second oil delivery circuit is connected to the second oil passage. Similarly, the oil inlet of the third oil delivery circuit is connected to an oil passage of the second double-hole oil circuit, the oil outlet of the third oil delivery circuit is connected to the first oil passage of the second clutch oil circuit, 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 oil passage of the second clutch oil circuit. Therefore, each switching clutch has two independent oil pipelines for conveying hydraulic oil.

[0051] In this embodiment, a first sealing ring 823 is provided on the input shaft on both sides of each oil inlet of the input shaft oil circuit, and a second sealing ring 833 is provided on the input shaft on both sides of each oil inlet of the output shaft oil circuit. That is, a first sealing ring is provided on both sides of the oil inlet of the first delivery oil circuit and the oil inlet of the second delivery oil circuit. If the first delivery oil circuit and the second delivery oil circuit are arranged side by side on the input shaft, the first sealing ring, the oil inlet of the first delivery oil circuit, the first sealing ring, the oil inlet of the second delivery oil circuit and the first sealing ring can be arranged on the input shaft in sequence. A sealed connection between the housing oil circuit and the input oil circuit is achieved to avoid leakage of hydraulic oil. On the input shaft section at the oil outlet of the first delivery oil circuit and the oil outlet of the second delivery oil circuit, an interference fit can be used to cooperate with the inner hole of the clutch, so that oil leakage will not occur between the input shaft oil circuit and the first clutch oil circuit, and oil crossover between various oil pipelines can also be avoided. Similarly, the second sealing ring is used to seal between the output shaft and the housing, and the output shaft and the inner hole of the clutch also adopt interference fit to ensure the sealing between the housing oil circuit, the output shaft oil circuit and the second clutch oil circuit.

[0052] The first sealing ring and the second sealing ring in this embodiment may be open sealing rings and have high wear resistance, which can ensure the service life on the input shaft or the output shaft and reduce the cost of transmission maintenance or repair.

[0053] In this embodiment, the transmission oil circuit structure is operated in a state full of hydraulic oil. Therefore, once the hydraulic oil is injected into the cavity again, the oil pressure in the cavity will be unbalanced, thereby driving the double-headed piston body to move in the cavity, and the double-headed piston body drives the first or second friction plate group to frictionally engage, thereby achieving the clutch effect. The preparation time for driving the double-headed piston body to move is zero, achieving the effect of zero-time waiting for clutch switching, and shortening the waiting time of the clutch structure during clutch switching.

[0054] In this embodiment, the first friction plate group 511 and the second friction plate group 521 have the same structure, and can be composed of a friction plate and a steel plate or a friction plate and a friction plate. In this embodiment, the friction plate and the steel plate are used as an example. The friction plate is installed on the clutch block, and the steel plate is installed on the outer side of the cavity; conversely, the friction plate can also be installed on the outer side of the cavity, and the steel plate can be installed on the clutch block, thereby forming a contact and friction effect between the friction plate and the steel plate, thereby performing a clutch operation on the gear connected to the other end of the clutch block.

[0055] In this embodiment, the number of intermediate shafts is multiple, which may be two, three or four, etc. Multiple intermediate shafts are arranged in a circumferential array on the central axis of the input shaft or the output shaft, such as two intermediate shafts can be arranged at the upper and lower positions of the input shaft and the output shaft respectively, and the multiple intermediate shafts have the same structure, and are provided with gears with the same number of teeth and the same tooth width. In this way, the load of the input shaft and the output shaft can be distributed through multiple intermediate shafts, and the bending strength of the input shaft, the intermediate shaft and the output shaft is enhanced, thereby improving the bearing capacity of the input shaft and the output shaft, and achieving the purpose of increasing the load.

[0056] It should be noted that, although the above embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the patent of the present invention.

Claims

1. A transmission with an oil circuit structure, characterized in that: It includes an input shaft, an output shaft, an intermediate shaft, a first switching dual clutch, a second switching dual clutch, a housing and an oil circuit structure; The center line of the input shaft is arranged in a colinear relationship with the center line of the output shaft, and the input end of the input shaft and the output end of the output shaft respectively penetrate the two opposite side walls of the housing and are arranged in the housing, the input shaft is drivingly connected with the input end of the intermediate shaft, the output end of the intermediate shaft is drivingly connected with the output shaft, and the center line of the intermediate shaft is arranged in the housing in parallel with the center line of the input shaft; The first switching double clutch is arranged on the input shaft, and the second switching double clutch is arranged on the output shaft. The first switching double clutch is located between two adjacent gear pairs on the input shaft and the output shaft, and the second switching double clutch is located between two adjacent gear pairs on the input shaft and the output shaft. The first switching double clutch and the second switching double clutch are used to control the gear pairs on both sides of the switching double clutch to perform mutually exclusive clutch operation. The oil circuit structure comprises a housing oil circuit, an input shaft oil circuit, an output shaft oil circuit, a first clutch oil circuit and a second clutch oil circuit, wherein the housing oil circuit is arranged in the housing, the input shaft oil circuit is arranged in the input shaft, a branch of the housing oil circuit is connected to the input shaft oil circuit; the output shaft oil circuit is arranged in the output shaft, and another branch of the housing oil circuit is connected to the output shaft oil circuit; the first clutch oil circuit is arranged in the first switching clutch, the input shaft oil circuit is connected to the first clutch oil circuit; the second clutch oil circuit is arranged in the second switching clutch, and the output shaft oil circuit is connected to the second clutch oil circuit; The housing oil circuit includes a first double-hole oil delivery circuit and a second double-hole oil delivery circuit, the oil inlet of the first double-hole oil delivery circuit and the oil inlet of the second double-hole oil delivery circuit are arranged on the outer side of the housing, the oil outlet of the first double-hole oil delivery circuit is arranged on the inner side of the shaft hole of the housing input shaft, and the oil outlet of the second double-hole oil delivery circuit is arranged on the inner side of the shaft hole of the housing output shaft; The first clutch oil circuit includes a first oil guide passage and a second oil guide passage; The first oil guide passage is arranged between one side of the clutch piston inner cavity and the inner side surface of the clutch inner hole, and the second oil guide passage is arranged between the other side of the clutch piston inner cavity and the inner side surface of the clutch inner hole; The second clutch oil circuit has the same structural arrangement as the first clutch oil circuit; The first switchable dual clutch comprises a first clutch block, a second clutch block and a piston unit; The piston unit comprises a double-headed piston body and a cavity, wherein the cross section of the double-headed piston body is an 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 outside 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, and 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 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 a gear pair, and the double-headed piston body is used to drive one of the first friction plate group or the second friction plate group to engage and the other to disengage. The second switchable dual clutch has the same structural arrangement as the first switchable dual clutch; 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 second sealing ring is provided on the input shaft on both sides of each oil inlet of the output shaft oil circuit.

2. The transmission with an oil circuit structure according to claim 1, characterized in that: The input shaft oil circuit includes a first oil delivery circuit and a second oil delivery circuit, an oil inlet of the first oil delivery circuit is communicated with one oil passage of the first double-hole oil circuit, an oil outlet of the first oil delivery circuit is communicated with the first oil guide passage, an oil inlet of the second oil delivery circuit is communicated with the other oil passage of the first double-hole oil circuit, and an oil outlet of the second oil delivery circuit is communicated with the second oil guide passage.

3. The transmission with oil circuit structure according to claim 1, characterized in that: The output shaft oil circuit includes a third oil delivery circuit and a fourth oil delivery circuit, an oil inlet of the third oil delivery circuit is communicated with an oil passage of the second double-hole oil circuit, an oil outlet of the third oil delivery circuit is communicated with an oil guide passage of the second clutch oil circuit, an oil inlet of the fourth oil delivery circuit is communicated with another oil passage of the second double-hole oil circuit, and an oil outlet of the fourth oil delivery circuit is communicated with another oil guide passage of the second clutch oil circuit.

4. The transmission with oil circuit structure according to claim 1, characterized in that: A plurality of intermediate shafts are provided, and the plurality of intermediate shafts are arranged in a circular array around the central axis of the input shaft in the housing.

5. The transmission with oil circuit structure according to claim 1, characterized in that: 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 and / or the output shaft between the first input gear and the first output gear.

6. The transmission with oil circuit structure according to claim 5, characterized in that: The intermediate shaft is provided with a second input gear, an input-output gear, and a second output gear; the first input gear and the second input gear are meshed with each other, the first output gear and the second output gear are meshed with each other, and the common gear and the input-output gear are meshed with each other; The first switching double clutch is arranged between the first input gear and the common gear, and the second switching double clutch is arranged between the common gear and the first output gear.

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