A two-speed transmission with power output

Abstract

The present invention discloses a two-speed transmission with power output. The two-speed transmission includes an input shaft, an output shaft, an intermediate shaft, a clutch, a housing, and a power motor. The input end of the input shaft and the output end of the output shaft respectively penetrate through opposite side walls of the housing. The input shaft and the output shaft are arranged on the housing. The input shaft transmits power to the output shaft through the clutch or transmits power to the intermediate shaft and then drives the output shaft to rotate through the intermediate shaft. The intermediate shaft is arranged inside the housing. The power motor is arranged on the housing, and the output end of the power motor is in transmission connection with the intermediate shaft. The power motor is used to transmit power to the intermediate shaft. The power motor installed on the intermediate shaft and the power source connected to the input shaft jointly drive the transmission. When needed, the power motor can also independently provide power for the transmission and drive the transmission to operate.

Description

Technical Field

[0001] The present invention relates to the field of transmissions, and more particularly to a two-speed transmission with power output. Background Art

[0002] Transmissions can change the different torques input before and after through different gear changes and different power drives. By switching different clutches of the transmission, different gears of the transmission can be switched. At the same time, in a hybrid vehicle system, by adding a power motor to the engine, hybrid drive of the transmission can be achieved. Hybrid vehicles have the characteristics of energy conservation and low emissions. Existing hybrid systems are generally used in small cars. The structure of existing large vehicles with hybrid power is relatively bulky. If a power motor is added, generally, transmissions are respectively connected to both ends of the power motor, making the transmission large in volume and occupying a large space. Summary of the Invention

[0003] Therefore, a two-speed transmission with power output is needed to solve the problem that the transmission of a hybrid vehicle occupies a large space.

[0004] To achieve the above object, the inventor provides a two-speed transmission with power output. The two-speed transmission includes an input shaft, an output shaft, an intermediate shaft, a first clutch, a second clutch, a housing, and a power motor.

[0005] The center line of the input shaft is collinearly arranged with the center line of the output shaft. The input end of the input shaft and the output end of the output shaft respectively penetrate through opposite side walls of the housing and are arranged on the housing. The input shaft conducts power to the intermediate shaft through the first clutch and then from the intermediate shaft to the output shaft. The input shaft conducts power to the output shaft through the second clutch. The intermediate shaft is arranged inside the housing, and the center line of the intermediate shaft is parallel to the center line of the input shaft.

[0006] One end of the intermediate shaft is in transmission connection with the rotating end of the power motor, and the power motor is arranged outside the housing. The power motor is used to conduct power to the intermediate shaft.

[0007] Further, the first clutch and the second clutch form a switching clutch. The switching dual clutch includes a first clutch block, a second clutch block, and a piston unit. The first clutch block is located on one side of the piston unit, the second clutch block is located on the other side of the piston unit, and the piston unit is used to engage and disengage the first clutch block and the second clutch block.

[0008] A first gear pair is arranged between the input shaft and the intermediate shaft, one gear of the first gear pair is movably sleeved on the input shaft, and another gear of the first gear pair is arranged on the intermediate shaft. A second gear pair is arranged between the output shaft and the intermediate shaft, one gear of the second gear pair is arranged on the intermediate shaft, and another gear of the second gear pair is arranged on the output shaft. The first clutch block is used for clutching the input shaft with a gear of the first gear pair, and the second clutch block is used for clutching the output shaft with the input shaft. The first clutch block and the second clutch block are mutually exclusive clutches.

[0009] Furthermore, 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 outside the cavity, and both ends of the cavity are connected to a hydraulic unit respectively.

[0010] Furthermore, 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 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.

[0011] Furthermore, a keyway is provided on the axial surface of the intermediate shaft, and the output end of the power motor is fixedly connected in the keyway.

[0012] Furthermore, there are multiple intermediate shafts, and the intermediate shafts are arranged in a circular array around the center lines of the input shaft and the output shaft. The multiple intermediate shafts have the same structure, and the multiple intermediate shafts are connected to power motors.

[0013] Furthermore, the power motor is a DC power motor.

[0014] Different from the prior art, the above technical solution is to add a power motor on the intermediate shaft, and drive the transmission together with the existing power at the input end of the input shaft. When necessary, the power motor can also provide power to the transmission alone to drive the transmission to work. When working together, the power motor will share the load of the output shaft and realize the output of hybrid power with the power of the input shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a simplified structural schematic diagram of a two-speed transmission according to a specific implementation method;

[0016] Figure 2 A structural schematic diagram of a two-speed transmission according to a specific implementation manner;

[0017] Figure 3 It is a schematic structural diagram of the switchable dual clutch described in a specific implementation method.

[0018] Description of the reference numerals:

[0019] 1. Two-speed transmission;

[0020] 101. Input shaft; 102. Output shaft; 103. Intermediate shaft; 104. Housing; 105. First clutch; 106. Second clutch;

[0021] 2. Power motor;

[0022] 3. Switchable dual clutch;

[0023] 301. First clutch block; 302. Second clutch block; 303. Double-headed piston body; 304. First gear pair; 305. Second gear pair; 306. First hydraulic unit; 307. Second hydraulic unit;

[0024] 3011. First friction plate group; 3021. Second friction plate group. Detailed implementation manners

[0025] To describe in detail the technical content, structural features, achieved objectives and effects of the technical solution, the following is a detailed description in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] Please refer to Figures 1 to 3 , this embodiment provides a two-speed transmission with power output. The two-speed transmission includes an input shaft 101, an output shaft 102, an intermediate shaft 103, a first clutch 105, a second clutch 106, a housing 104, and a power motor 2. The center line of the input shaft 101 is collinear with the center line of the output shaft 102. The input end of the input shaft 101 and the output end of the output shaft 102 respectively penetrate through the opposite side walls of the housing 104 and are disposed on the housing 104. The input shaft 101 conducts power to the intermediate shaft 103 through the first clutch 105 and then from the intermediate shaft 103 to the output shaft 102. The input shaft 101 conducts power to the output shaft 102 through the second clutch 106. The intermediate shaft 103 is disposed inside the housing 104, and the center line of the intermediate shaft 103 is parallel to the center line of the input shaft 101. One end of the intermediate shaft 103 is in transmission connection with the rotating end of the power motor 2, and the power motor 2 is disposed outside the housing 104. The power motor 2 is used to conduct power to the intermediate shaft 103.

[0027] Please refer to Figure 2 , Figure 3, It should be noted that the rotating end of the power motor 2 and the intermediate shaft 103 can be connected through a transmission connecting member or directly connected, and drive the operation of the transmission together with or independently of the power unit. When driving together, the power motor 2 will act as an auxiliary power to cooperate with the power system to drive; sometimes, the power motor 2 can also drive the transmission to work independently, and the power unit can be an engine or a motor. There are the following 5 ways for the power transmission path of the above solution: First: The power unit and the power motor 2 work simultaneously. The power of the input shaft 101 is transmitted to the intermediate shaft 103 after passing through the first clutch 105, and then transmitted to the output shaft 102. The power motor 2 also transmits power to the intermediate shaft 103 and then conducts it to the output shaft 102, that is, the two-speed transmission 1 has two power sources at the same time. Second: The power unit works and the power motor does not work. The first clutch 105 transmits the power of the input shaft 101 to the output shaft 102 after passing through the intermediate shaft 103. At this time, the power motor 2 does not provide power. Third: The power unit and the power motor work simultaneously. The power of the input shaft 101 is transmitted to the output shaft 102 through the second clutch 106. The power motor 2 also transmits power to the intermediate shaft 103, and then is transmitted from the intermediate shaft 103 to the output shaft 102, that is, the two-speed transmission 1 has two power sources at the same time. Fourth: The power unit works and the power motor does not work. The power of the input shaft 101 is transmitted to the output shaft 102 through the second clutch 106. At this time, the power motor 2 does not provide power. Fifth: The two-speed transmission 1 is in a neutral state, and the double-headed piston body 303 does not engage with the first clutch block 301 and the second clutch block 302. The power unit does not work, and the power motor 2 provides power independently and directly transmits the power to the output shaft 102. The power motor 2 can be a DC power motor, an AC power motor, a permanent magnet synchronous motor, etc.

[0028] In this embodiment, the connection between the power motor and the intermediate shaft is a direct connection. Specifically, a keyway is provided on the shaft surface of the intermediate shaft, and the output end of the power motor can be inserted and fixed in the keyway by an interference fit method. Or the direct connection can be in other embodiments, such as connecting the output end of the power motor and one end of the intermediate shaft through a coupling.

[0029] In some embodiments, the connection between the power motor and the intermediate shaft can be a gear connection. Specifically, a gear can be sleeved on the output shaft of the power motor, and a gear is also sleeved on the intermediate shaft. The gears on the power motor and the intermediate shaft mesh with each other, so that the power motor drives the output shaft to rotate.

[0030] Generally, a clutch is arranged on the power input end. One end of the clutch is connected to the power input end, and the other end is connected to the power output end. In this embodiment, the power input end may be the input shaft 101, and the power output end is a gear rotatably sleeved on the input shaft 101; or the power output end is the output shaft 102, and the power input end is a gear rotatably sleeved on the output shaft 102. The first clutch 105 and the second clutch 106 may be friction clutches or the like. In some embodiments, the first clutch 105 and the second clutch 106 are existing clutch structures, such as friction clutches and hydraulic clutches, and the clutch only plays a role in transmitting power. When it is a friction clutch, a friction clutch is arranged beside each gear of each gear pair. One end of the friction clutch is fixed on the input shaft 101 (or output shaft 102), and the other end of the friction clutch is connected to the gear of the gear pair. When the friction clutch is in the engaged state, the input shaft 101 (or output shaft 102) is in gear transmission with the gear. When the friction clutch is in the disengaged state, the input shaft 101 (or output shaft 102) is not in gear transmission with the gear. It should be noted that in this embodiment, the motor installed on the intermediate shaft 103 will jointly drive the transmission with the existing power unit located at the input end of the input shaft 101. When needed, the power motor 2 can also provide power for the transmission alone to drive the transmission to operate. When operating jointly, the power motor 2 shares the load of the output shaft and realizes the output of hybrid power with the power of the input shaft. Since the power motor 2 is arranged on the intermediate shaft 103 on the side of the transmission instead of on the output shaft 102, the structure is more compact, the occupied space is reduced, and at the same time, the purpose of increasing the load is achieved.

[0031] In this embodiment, there are multiple intermediate shafts 103, and the intermediate shafts 103 are arranged in an annular array around the center lines of the input shaft 101 and the output shaft 102. The multiple intermediate shafts 103 have the same structure, and each intermediate shaft 103 is respectively connected to a power motor 2. The number of intermediate shafts 103 can be two, three, four, etc. The multiple intermediate shafts 103 are arranged in a circumferential array around the central axis of the input shaft 101 or the output shaft 102. For example, two intermediate shafts 103 can be respectively arranged at the upper and lower positions of the input shaft 101 and the output shaft 102, and four intermediate shafts 103 can be respectively arranged at the upper, lower, left, and right positions of the input shaft 101 and the output shaft 102. The multiple intermediate shafts 103 have the same structure and are provided with gears having the same number of teeth and the same tooth width. In this way, through the multiple intermediate shafts 103, the loads on the input shaft 101 and the output shaft 102 can be distributed, and at the same time, the bending resistance on the input shaft 101 and the output shaft 102 is enhanced, thereby improving the bearing capacity of the input shaft 101 and the output shaft 102 and achieving the purpose of increasing the load. At the same time, through the multiple power motors 2, in the case of the same output power, the individual length of the multiple power motors 2 can be greatly reduced compared with that of a single power motor 2, so that the length of the hybrid vehicle can be greatly reduced, making the structure compact. Especially in fields such as mining vehicles that require high-power motors, the use of multiple small power motors 2 can use the power motors 2 of existing passenger cars, which can greatly reduce the cost.

[0032] When using existing clutches, there will be a situation where the two clutches are in the engaged state at the same time, which will cause gear jamming. In order to optimize the structure of the transmission, solve the problem of gear jamming during clutch switching in traditional transmissions, and make the overall structure simpler, in this embodiment, the first clutch 105 and the second clutch 106 are combined into the structure of a switching dual clutch 3. The switching dual clutch 3 includes a first clutch block 301, a second clutch block 302, and a piston unit. Please refer to Figure 3The first clutch block 301 is located on one side of the piston unit, and the second clutch block 302 is located on the other side of the piston unit. The piston unit is used to engage and disengage the first clutch block 301 and the second clutch block 302 with the piston unit. The piston unit of the switching dual clutch 3 can only separately push the first clutch block 301 or the second clutch block 302 into the engaged state, avoiding the situation of being in the engaged state simultaneously. A first gear pair 304 is arranged between the input shaft 101 and the intermediate shaft 103. One gear of the first gear pair 304 is movably sleeved on the input shaft 101, and the other gear of the first gear pair 304 is arranged on the intermediate shaft 103. A second gear pair 305 is arranged between the output shaft 102 and the intermediate shaft 103. One gear of the second gear pair 305 is arranged on the intermediate shaft 103, and the other gear of the second gear pair 305 is arranged on the output shaft 102. The first clutch block 301 is used to engage and disengage the input shaft 101 and one gear of the first gear pair 304, and the second clutch block 302 is used to engage and disengage the output shaft 102 and the input shaft 101. The first clutch block 301 and the second clutch block 302 are mutually exclusive in engagement and disengagement.

[0033] In the embodiment, the switchable dual clutch 3 is arranged on the input shaft 101 or the output shaft 102, and is in driving connection with the intermediate shaft 103 or the output shaft 102. Taking the input shaft as an example: a first gear pair 304 is arranged between the input shaft and the intermediate shaft 103, one gear of the first gear pair 304 is movably sleeved on the input shaft 101, and another gear of the first gear pair 304 is arranged on the intermediate shaft 103, and a second gear pair 305 is arranged between the output shaft 102 and the intermediate shaft 103, one gear of the second gear pair 305 is movably sleeved on the output shaft 102, and another gear of the second gear pair 305 is arranged on the intermediate shaft 103. The input shaft 101 and the intermediate shaft 103 are in driving connection through the first gear pair 304, and the output shaft 102 and the intermediate shaft 103 are in driving connection through the second gear pair 305. The first clutch block 301 (realizing the function of the first clutch 105) of the switching dual clutch 3 is used for clutching the input shaft 101 with a gear of the first gear pair 304, and the second clutch block 302 (realizing the function of the second clutch 106) of the switching dual clutch 3 is used for clutching the input shaft 101 with a gear of the second gear pair 305. The first clutch block 301 and the second clutch block 302 of the switching dual clutch 3 are mutually exclusive clutches. Through the above-mentioned gear pair and the switching dual clutch 3, the power of the input shaft 101 can be transmitted to the intermediate shaft 103 or the output shaft 102. Through the different gear ratios of the gear pair set on the input shaft 101, the power of the input shaft 101 can be transmitted to the intermediate shaft 103 with different torques, and then the power is output to the output shaft 102 through the intermediate shaft 103; or the power of the input shaft 101 can be directly transmitted to the output shaft 102. By controlling the change of the torque in the power transmission process, the gear position change of the second gear transmission can be achieved.

[0034] In this embodiment, the piston unit only needs to be able to push left and right to make the clutch blocks on both sides engage and disengage. In this embodiment, the piston unit includes a double-headed piston body 303 and a cavity; the cross section of the double-headed piston body 303 is an I-shaped, one end of the double-headed piston body 303 is arranged in the cavity, and the other end of the double-headed piston body 303 is located outside the cavity, and the two ends of the cavity are respectively connected to the first hydraulic unit 306 and the second hydraulic unit 307. The double-headed piston body 303 will only push one clutch block to form a closed state with the gear pair, so that one of the switching dual clutches 3 will only be in a closed state with one gear pair, and be in a closed state with the other gear pair, so that the clutch blocks on both sides will not be engaged at the same time, making the transmission shift more accurate and flexible. At the same time, by setting the other end of the double-headed piston body 303 outside the cavity and used to push the clutch blocks on both sides to engage and disengage, the lateral width of the double-headed piston body 303 is also reduced, thereby making the structure compact.

[0035] In this embodiment, in order to implement the clutch structure inside the clutch, the clutch method of friction plates can be adopted. The first clutch block 301 includes a first friction plate group 3011, the second clutch block 302 includes a second friction plate group 3021. The first friction plate group 3011 is located on one side of the other end of the double-headed piston body 303, and the second friction plate group 3021 is located on the other side of the other end of the double-headed piston body 303. The first clutch block 301 and the second clutch block 302 are respectively arranged on the two side gear pairs, and the double-headed piston body 303 is used to drive one of the first friction plate group 3011 or the second friction plate group 3021 to engage and the other to disengage. That is, by pushing the friction plate of the first clutch block 301 or the friction plate of the second clutch block 302 with the double-headed piston body 303, the engagement and disengagement of the first clutch block 301 or the second clutch block 302 can be realized.

[0036] In this embodiment, the double-headed piston body 303 is used to push the first friction plate group 3011 and the second friction plate group 3021. In order to provide power for the double-headed piston body 303, both ends of the cavity of the switching type dual clutch 3 are respectively connected to a first hydraulic unit 306 and a second hydraulic unit 307, which are used to drive the movement of the double-headed piston body 303. The first hydraulic unit 306 and the second hydraulic unit 307 are arranged to be in communication with both ends of the cavity. Therefore, after pressurizing the hydraulic oil of only one side of the hydraulic unit, the oil pressure in the cavity will be unbalanced, and then the double-headed piston body 303 will be driven to move to the other side in the cavity, achieving the purpose of controlling the movement of the double-headed piston body 303 in the cavity through the oil pressure of the hydraulic oil.

[0037] It should be noted that although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications made to the embodiments described in this article, or the equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.

Claims

1. A two-speed transmission with power output, characterized in that, The two-speed transmission comprises an input shaft, an output shaft, an intermediate shaft, a first clutch, a second clutch, a housing and a power motor; The center line of the input shaft is arranged in a colinear relationship with the center line of the output shaft. The input end of the input shaft and the output end of the output shaft are respectively arranged on the housing and penetrate the two opposite side walls of the housing. The input shaft transmits power to the intermediate shaft through the first clutch and then transmits power to the output shaft through the intermediate shaft. The input shaft transmits power to the output shaft through the second clutch. The intermediate shaft is arranged in the housing, and the center line of the intermediate shaft is parallel to the center line of the input shaft. One end of the intermediate shaft is drivingly connected to the rotating end of the power motor, and the power motor is arranged outside the housing, and the power motor is used to transmit power to the intermediate shaft; The first clutch and the second clutch form a switchable double clutch, and the switchable double clutch includes a first clutch block, a second clutch block and a piston unit; the first clutch block is located on one side of the piston unit, and the second clutch block is located on the other side of the piston unit, and the piston unit is used to clutch the first clutch block and the second clutch block; A first gear pair is arranged between the input shaft and the intermediate shaft, one gear of the first gear pair is movably sleeved on the input shaft, and another gear of the first gear pair is arranged on the intermediate shaft; a second gear pair is arranged between the output shaft and the intermediate shaft, one gear of the second gear pair is arranged on the intermediate shaft, and another gear of the second gear pair is arranged on the output shaft; the first clutch block is used for clutching the input shaft with one gear of the first gear pair, and the second clutch block is used for clutching the output shaft with the input shaft; the first clutch block and the second clutch block are mutually exclusive clutches; 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 body, 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, and both ends of the cavity are connected to a hydraulic unit respectively; 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 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 power motor is a DC power motor.

2. The two-speed transmission with power output according to claim 1, characterized in that, A keyway is arranged on the axial surface of the intermediate shaft, and the output end of the power motor is fixedly connected in the keyway.

3. The two-speed transmission with power output according to claim 1, characterized in that, There are multiple intermediate shafts, and the intermediate shafts are arranged in a circular array around the center lines of the input shaft and the output shaft. The multiple intermediate shafts have the same structure, and the multiple intermediate shafts are connected to power motors.

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