A two-speed transmission with a hydraulic control system

Abstract

The present invention provides a two-speed transmission with a hydraulic control system, comprising an input shaft, an output shaft, a switchable dual clutch, a housing, an oil circuit structure and an oil circuit control system, wherein the oil circuit control system comprises a power unit and a control unit, wherein the output end of the power unit is connected to the housing oil circuit pipeline, the control unit is arranged on the pipeline between the housing oil circuit and the power unit, and the control unit is used to control the hydraulic oil pressure at both ends of the switchable dual clutch. The present invention works in a state where the oil circuit of the oil circuit structure is filled with hydraulic oil, so that only a small amount of hydraulic oil needs to be adjusted to break the oil pressure balance in the switchable dual clutch piston chamber, thereby achieving the effect of fast switching of the clutch.

Description

Technical Field

[0001] The invention relates to the field of transmissions, and in particular to a two-speed transmission with a hydraulic control system. 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 process of the vehicle. However, in the existing two-speed vehicles, the two-speed transmission needs to be meshed through more than or equal to two sets of gear sets, resulting in a larger size of the existing transmission. In addition, the power transmission path of the existing two-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 two-speed transmission with a hydraulic control system to solve the problem of a long switching time gap when changing gears in the existing transmission.

[0004] To achieve the above object, the inventor provides a two-speed transmission with a hydraulic control system, including an input shaft, an output shaft, a switchable dual clutch, a housing, an oil circuit structure and an oil circuit control system;

[0005] The center line of the input shaft is arranged in parallel with the center line of the output shaft, and the center line of the input shaft and the center line of the output shaft are arranged in parallel with each other, and the input end of the input shaft and the output end of the output shaft respectively penetrate the opposite side walls of the shell and are arranged in the shell, the input end of the input shaft protrudes from the shell, and the output end of the output shaft protrudes from the shell;

[0006] The switchable dual clutch is arranged on the input shaft, the input shaft is provided with a first input gear and a second input gear, the output shaft is provided with a first output gear and a second output gear, the first input gear and the first output gear are arranged to mesh with each other, the second input gear and the second output gear are arranged to mesh with each other, the switchable dual clutch is located between the first input gear and the second input gear, and the switchable dual clutch is used to control the first input gear or the second input gear to perform mutually exclusive clutch operation with the input shaft;

[0007] The oil circuit structure includes a housing oil circuit, an input shaft oil circuit, and a clutch oil circuit. The housing oil circuit is arranged in the housing, the input shaft oil circuit is arranged in the input shaft, and the housing oil circuit and the input shaft oil circuit are arranged in conduction with each other; the clutch oil circuit is arranged in the switchable dual clutch, and the input shaft oil circuit and the clutch oil circuit are arranged in conduction with each other;

[0008] The oil circuit control system includes a power unit and a control unit. The output end of the power unit is connected to the shell oil circuit pipeline. The control unit is arranged on the pipeline between the shell oil circuit and the power unit. The control unit is used to control the hydraulic oil pressure at both ends of the switchable dual clutch.

[0009] Furthermore, it also includes an oil storage tank and a filter. The oil inlet of the power unit is connected to the oil storage tank pipe, and the filter is arranged on the pipeline at the output end of the power unit.

[0010] Furthermore, the housing oil circuit is a double-hole oil delivery circuit, the oil inlet of the double-hole oil delivery circuit is arranged on the outer side of the housing, and the oil outlet of the double-hole oil delivery circuit is arranged on the inner side of the shaft hole of the housing input shaft.

[0011] Further, the clutch oil circuit includes a first oil guide channel and a second oil guide channel;

[0012] 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.

[0013] Further, the control unit includes a first proportional valve, a second proportional valve, a first pressure detector and a second pressure detector, the first proportional valve is arranged on a pipeline between the shell oil circuit where the first oil guide passage is located and the power unit, the oil return port of the first proportional valve is connected to the oil storage tank pipe, the second proportional valve is arranged on a pipeline between the shell oil circuit where the second oil guide passage is located and the power unit, and the oil return port of the second proportional valve is connected to the oil storage tank pipe;

[0014] The first pressure detector is arranged on a pipeline between the first proportional valve and the switchable dual clutch, and the second pressure detector is arranged on a pipeline between the second proportional valve and the switchable dual clutch.

[0015] Further, the switchable dual clutch comprises a first clutch block, a second clutch block and a piston unit;

[0016] 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;

[0017] 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 respectively arranged on the gear pairs on both sides, 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.

[0018] 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 communicated with one oil channel of the double-hole oil circuit, the oil outlet of the first oil delivery circuit is communicated with the first oil guide channel, the oil inlet of the second oil delivery circuit is communicated with the other oil channel of the double-hole oil circuit, and the oil outlet of the second oil delivery circuit is communicated with the second oil guide channel.

[0019] Different from the prior art, the transmission of the above technical solution controls the gear shifting through a switchable dual clutch, so that the power can be transmitted through the first input gear to the first output gear or the second input gear to the second output gear. The switchable dual clutch transmits the hydraulic oil through the housing oil circuit, the input shaft oil circuit and the clutch oil circuit through the power unit, and controls the pressure of the hydraulic oil through the first proportional valve to achieve the effect of clutching the switchable dual clutch. The oil circuit structure works in a state of being filled with 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, drive the switchable dual clutch to perform clutch operation, and achieve the effect of zero waiting time for switching the clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a two-speed transmission with a hydraulic control system according to a specific embodiment;

[0021] Figure 2 It is a schematic diagram of a two-speed transmission with a hydraulic control system according to a specific embodiment;

[0022] Figure 3 A cross-sectional view of a two-speed transmission with a hydraulic control system according to a specific embodiment;

[0023] Figure 4 It is a structural diagram of a two-speed transmission with a hydraulic control system according to a specific embodiment;

[0024] Figure 5 It is a partial schematic diagram of a two-speed transmission with a hydraulic control system described in a specific embodiment.

[0025] Description of reference numerals:

[0026] 10. Input shaft; 11. First input gear;

[0027] 20. output shaft; 21. first output gear;

[0028] 41. Second input gear;

[0029] 43. Second output gear

[0030] 50. Switchable dual clutch;

[0031] 51. first clutch block; 511. first friction plate group;

[0032] 52, second clutch block; 521, second friction plate group;

[0033] 53. Piston unit; 531. Double-headed piston body; 532. Cavity;

[0034] 70. Shell;

[0035] 80. Oil circuit structure; 81. Housing oil circuit; 82. Input shaft oil circuit;

[0036] 84. Clutch oil circuit;

[0037] 811, double hole oil delivery circuit;

[0038] 821, first oil delivery passage; 822, second oil delivery passage; 823, first sealing ring;

[0039] 841, first oil guide channel; 842, second oil guide channel;

[0040] 90. Oil circuit control system; 91. Power unit; 92. Control unit;

[0041] 94. Oil storage tank; 95. Filter;

[0042] 921, a first proportional valve; 922, a second proportional valve; 923, a first pressure detector;

[0043] 924, second pressure detector; DETAILED DESCRIPTION

[0044] 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.

[0045] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The present embodiment provides a two-speed transmission with a hydraulic control system, including an input shaft 10, an output shaft 20, a switching dual clutch 50, a housing 70, an oil circuit structure 80 and an oil circuit control system 90. The oil circuit control system includes a power unit 91, a control unit 92, an oil storage tank 94 and a filter 95. The housing oil circuit inlet on the outer side of the housing is connected to the power unit by a pipe, and the power unit can transport the hydraulic oil by a gear pump or a hydraulic pump, etc. There are two oil channels in the clutch oil circuit of the oil circuit structure, which are: a first oil guide channel and a second oil guide channel. The hydraulic oil is transported to one side of the double-headed piston body in the cavity of the switching dual clutch through the first oil guide channel, and the hydraulic oil is transported to the other side of the double-headed piston body in the cavity of the switching dual clutch by the second oil guide channel. Therefore, when oil enters one side of the cavity, it will push the double-headed piston body to move, causing the cavity space on that side to increase and increase the oil pressure. Relatively speaking, the space on the other side of the cavity decreases, and oil return is required. Since the switching dual clutch has two independent oil supply channels, the hydraulic oil is transported through two pipelines outside the shell.

[0046] Specifically, in order to fill the oil circuit with hydraulic oil, the double-headed piston body can be driven to move by oil intake. In this embodiment, the control unit includes a first proportional valve 921, a second proportional valve 922, a first pressure detector 923 and a second pressure detector 924. The first proportional valve and the second proportional valve can be proportional pressure reducing valves. There are two sections of pipelines between the oil storage tank and the shell, the front part of which is the main pipeline and the rear part is two branch pipelines. A gear pump, a filter and a main pipeline check valve are installed in sequence on the main pipeline. Multiple filters can be installed, and a branch check valve, a proportional valve and a pressure detector are installed in sequence on each branch pipeline.

[0047] Taking the independent oil circuit where the first oil guide is located as an example, when delivering hydraulic oil, the gear pump is turned on to deliver the hydraulic oil in the oil tank to the filter, and the filter filters the large particles of impurities in the hydraulic oil, such as dust, gravel or oil blocks, etc. Then it is delivered to each branch pipeline through the main circuit check valve. On a branch pipeline, the hydraulic oil is again delivered to the oil circuit structure through the branch check valve, the first proportional valve and the first pressure detector, and then the hydraulic oil is delivered to one side of the cavity of the switchable dual clutch through the first oil guide. Similarly, for the independent oil circuit where the second oil guide is located, the hydraulic oil is delivered to the oil circuit structure through the branch check valve, the second proportional valve and the second pressure detector on another branch pipeline, and then the hydraulic oil is delivered to the other side of the cavity of the switchable dual clutch through the second oil guide.

[0048] After the hydraulic oil enters the oil circuit structure, if the switchable dual clutch is controlled, the hydraulic oil passes through the housing oil circuit, the input shaft oil circuit and the clutch oil circuit in sequence to reach the piston chamber of the switchable dual clutch.

[0049] If the piston chamber of the switching dual clutch returns oil, the proportional pressure reducing valve is used to reduce the pressure and return the oil, and the proportional pressure reducing valve can return the oil according to the oil pressure, and the refluxed hydraulic oil is transported back to the oil storage tank. At the same time, the first pressure detector monitors the oil pressure on the first oil guide channel, that is, when the oil pressure in the cavity of the switching dual clutch decreases, the first pressure detector will feed back the detected information to the terminal, which can be a controller, computer, mobile phone or industrial control mainframe. The terminal processes the information and controls the return oil volume of the first proportional valve to ensure that the oil channel structure of the switching dual clutch is full of oil.

[0050] In this embodiment, the input end of the input shaft and the output end of the output shaft are respectively arranged in the housing through the two opposite side walls of the housing, and the center line of the output shaft is arranged in the housing in parallel with the center line of the input shaft. The housing can protect the shaft, gears and clutch in the transmission. The input shaft is provided with a first input gear 11 and a second input gear 41, and the output shaft is provided with a first output gear 21 and a second output gear 43. The first input gear and the first output gear are meshed with each other to form a first gear pair, and the second input gear and the second output gear are meshed with each other to form a second gear pair.

[0051] The switchable dual clutch is installed on the input shaft between the first input gear and the second input gear, and performs mutually exclusive clutching operation on the first gear pair and the second 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; on the contrary, when the second gear pair is in the engaged state, the first gear pair is in the disengaged state. When in the engaged state, the power of the input shaft is transmitted to the gear pair corresponding to the engaged state, and the other gear pair is in the disengaged state. Therefore, the switchable dual clutch can perform two different routes of power transmission on the first gear pair and the second gear pair.

[0052] Specifically, the first route is: the power of the input shaft can be transmitted to the output shaft through the first gear pair; the corresponding second route is: the input shaft transmits power to the output shaft through the second gear pair. The effect of changing two gear positions with two pairs of gear pairs is achieved.

[0053] In this embodiment, the 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.

[0054] In this embodiment, the oil circuit structure includes a housing oil circuit 81, an input shaft oil circuit 82, and a clutch oil circuit 84. The housing oil circuit includes a double-hole delivery oil circuit 811, the clutch oil circuit includes a first oil guide channel 841 and a second oil guide channel 842, and the input shaft oil circuit includes a first delivery oil circuit 821 and a second delivery oil circuit 822. 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 an initial preparation state.

[0055] 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 switchable dual clutch is engaged or disengaged, the hydraulic oil is input into the cavity of the switchable dual clutch through the housing oil passage, the input shaft oil passage and the clutch oil passage, thus completing the delivery of the hydraulic oil.

[0056] Specifically, there are two oil passages between the housing, the input shaft and the switchable dual clutch. The double-hole delivery oil 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 double-hole delivery oil passage, while the 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 the two sides of the cavity respectively, so as to complete the purpose of delivering the hydraulic oil from the housing to the switchable dual clutch.

[0057] At the connection between the 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 a sealing ring, that is, the sealing ring is located between the housing and the input shaft for sealing, and each double-hole oil delivery circuit has an oil inlet groove for conduction connection. Between the input shaft and the inner hole of the switchable dual clutch, they are connected by interference fit, and an annular oil outlet groove is also used to connect 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 transported 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.

[0058] In this embodiment, the first clutch block is connected to the first input gear of the input shaft, and the second clutch block is connected to the second input gear of the input shaft, so the switchable dual clutch can perform mutually exclusive clutch control on the first gear pair or the second gear pair of the input shaft. In this embodiment, the first oil guide channel pushes the double-headed piston body to move toward the second input gear after oil is introduced, and the second oil guide channel pushes the double-headed piston body to move toward the first input gear after oil is introduced.

[0059] 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 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 switchable 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. Since the first input gear is meshed with the first output gear, the power can be transmitted from the input shaft to the output shaft. At this time, the switchable dual clutch and the second gear pair are in a disengaged state.

[0060] Similarly, when the second gear pair is in the engaged state, the hydraulic oil is transported through the first oil channel of the double-hole oil delivery circuit, the first oil delivery circuit of the input shaft oil circuit, and the first oil guide channel, so that the double-headed piston body of the switchable dual clutch moves toward the second gear pair. The double-headed piston body pushes the second friction plate group to perform combined friction, and transmits power from the input shaft to the second output gear through the second clutch block, so that the second gear pair is in the engaged state, that is, the second input gear is meshed with the second output gear, and the power is transmitted from the input shaft to the output shaft. At this time, the switchable dual clutch and the first gear pair are in the disengaged state.

[0061] Specifically, in this embodiment, the oil inlet of the first oil delivery circuit is connected to one oil channel of the double-hole oil circuit, the oil outlet of the first oil delivery circuit is connected to the first oil channel, the oil inlet of the second oil delivery circuit is connected to the other oil channel of the double-hole oil circuit, and the oil outlet of the second oil delivery circuit is connected to the second oil channel. Therefore, the switching clutch has two independent oil pipelines for delivering hydraulic oil.

[0062] 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. That is, a first sealing ring is provided on both sides of the oil inlet of the first oil delivery circuit and the oil inlet of the second oil delivery circuit. If the first oil delivery circuit and the second oil delivery circuit are arranged side by side on the input shaft, the first sealing ring, the oil inlet of the first oil delivery circuit, the first sealing ring, the oil inlet of the second oil delivery 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 oil delivery circuit and the oil outlet of the second oil delivery 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 clutch oil circuit, and oil cross-talk between the various oil pipelines can also be avoided.

[0063] The first sealing ring in this embodiment may be an open sealing ring and has a high wear resistance, which can ensure the service life of the input shaft or the output shaft and reduce the cost of transmission maintenance or repair.

[0064] The oil circuit structure of the transmission in this embodiment works in a state full of hydraulic oil. Therefore, once the hydraulic oil is pressurized in the cavity, 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.

[0065] 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.

[0066] 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 two-speed transmission with a hydraulic control system, characterized in that: It includes an input shaft, an output shaft, a switching dual clutch, a housing, an oil circuit structure and an oil circuit control system; The center line of the input shaft is arranged in parallel with the center line of the output shaft, and the center line of the input shaft and the center line of the output shaft are arranged in parallel with each other, and the input end of the input shaft and the output end of the output shaft respectively penetrate the opposite side walls of the shell and are arranged in the shell, the input end of the input shaft protrudes from the shell, and the output end of the output shaft protrudes from the shell; The switchable dual clutch is arranged on the input shaft, the input shaft is provided with a first input gear and a second input gear, the output shaft is provided with a first output gear and a second output gear, the first input gear and the first output gear are arranged to mesh with each other, the second input gear and the second output gear are arranged to mesh with each other, the switchable dual clutch is located between the first input gear and the second input gear, and the switchable dual clutch is used to control the first input gear or the second input gear to perform mutually exclusive clutch operation with the input shaft; The oil circuit structure includes a housing oil circuit, an input shaft oil circuit, and a clutch oil circuit. The housing oil circuit is arranged in the housing, the input shaft oil circuit is arranged in the input shaft, and the housing oil circuit and the input shaft oil circuit are arranged in conduction with each other; the clutch oil circuit is arranged in the switchable dual clutch, and the input shaft oil circuit and the clutch oil circuit are arranged in conduction with each other; The oil circuit control system includes a power unit and a control unit, wherein the output end of the power unit is connected to the housing oil circuit pipeline, and the control unit is arranged on the pipeline between the housing oil circuit and the power unit, and the control unit is used to control the hydraulic oil pressure at both ends of the switchable dual clutch; It also includes an oil storage tank and a filter, wherein the oil inlet of the power unit is connected to the oil storage tank pipe, and the filter is arranged on the pipeline at the output end of the power unit; The housing oil circuit is a double-hole oil delivery circuit, the oil inlet of the double-hole oil delivery circuit is arranged on the outer side of the housing, and the oil outlet of the double-hole oil delivery circuit is arranged on the inner side of the shaft hole of the housing input shaft; The 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 control unit includes a first proportional valve, a second proportional valve, a first pressure detector and a second pressure detector, wherein the first proportional valve is arranged on a pipeline between the housing oil circuit where the first oil guide passage is located and the power unit, and the oil return port of the first proportional valve is connected to the oil storage tank pipe, and the second proportional valve is arranged on a pipeline between the housing oil circuit where the second oil guide passage is located and the power unit, and the oil return port of the second proportional valve is connected to the oil storage tank pipe; The first pressure detector is arranged on a pipeline between the first proportional valve and the switchable dual clutch, and the second pressure detector is arranged on a pipeline between the second proportional valve and the switchable dual clutch; The 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 respectively arranged on the gear pairs on both sides, 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.

2. The two-speed transmission with a hydraulic control system 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 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 double-hole oil circuit, and an oil outlet of the second oil delivery circuit is communicated with the second oil guide passage.

Images