A two-speed transmission for hybrid power output

Abstract

The present invention discloses a two-speed transmission for hybrid power output. The two-speed transmission includes: an input shaft, an output shaft, an intermediate shaft, a first clutch, a second clutch, a third clutch, and a housing; the center lines of the input shaft and the output shaft are arranged collinearly, and the input end of the input shaft and the output end of the output shaft respectively penetrate through the opposite side walls of the housing and are arranged on the housing; the input shaft transmits power to the intermediate shaft through the first clutch, and then the intermediate shaft transmits the power to the second clutch or the third clutch, and the second clutch or the third clutch drives the output shaft to rotate. The center line of the intermediate shaft is arranged parallel to the center line of the input shaft in the housing; one end of the intermediate shaft is in transmission connection with the rotating end of the power motor. By means of the first clutch installed on the input shaft, the connection with the engine can be cut off, so that the motor can output power independently.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and in particular to a two-speed transmission for hybrid power output. Background Art

[0002] A transmission can change 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 a transmission is 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, there is a need to provide a two-speed transmission for hybrid power output 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 for hybrid power output. The two-speed transmission includes: an input shaft, an output shaft, an intermediate shaft, a first clutch, a second clutch, a third clutch, and a housing;

[0005] The center line of the input shaft is collinearly arranged 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 through opposite side walls of the housing and are arranged on the housing;

[0006] The input shaft transmits power to the intermediate shaft through the first clutch, and then the intermediate shaft transmits the power to the second clutch or the third clutch. The second clutch or the third clutch drives the output shaft to rotate. The center line of the intermediate shaft is parallel to the center line of the input shaft and is arranged in the housing;

[0007] 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 and is used to drive the intermediate shaft to rotate.

[0008] Further, 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 structures of the multiple intermediate shafts are the same, and each intermediate shaft is respectively connected to a power motor.

[0009] Further, the second clutch and the third clutch are combined into a structure of a switching dual clutch. The switching dual clutch includes a first clutch block, a second clutch block, and a piston unit;

[0010] 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. The piston unit is used to engage and disengage the first clutch block, the second clutch block and the piston unit.

[0011] 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 the other 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 the other gear of the second gear pair is arranged on the output shaft. The first clutch block is used to engage and disengage the input shaft and one gear of the first gear pair, and the second clutch block is used to engage and disengage the output shaft and the input shaft. The first clutch block and the second clutch block are mutually exclusive in engagement and disengagement.

[0012] Further, the piston unit includes a double-headed piston body and a cavity.

[0013] The cross-section of the double-headed piston body is in the shape of a Chinese character 'gong'. 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. Both ends of the cavity are respectively connected to a first hydraulic unit and a second hydraulic unit.

[0014] Further, 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 two side gear pairs. The double-headed piston body is used to drive one of the first friction plate group and the second friction plate group to engage and the other to disengage.

[0015] Further, 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.

[0016] Further, the power motor is a DC power motor.

[0017] Different from the prior art, a clutch is added to the two-speed transmission in the above technical solution. By means of the first clutch added to the input shaft, the power connection between the intermediate shaft and the input shaft can be cut off, so that the power motor can output power independently, avoiding power loss of the input shaft when it is not working. At the same time, by adding a power motor to the intermediate shaft, the power of the input shaft is used to jointly drive the transmission. 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. Since the power motor is arranged on the intermediate shaft on the side of the transmission instead of on the output shaft, the structure is more compact and the occupied space is reduced. Description of the Drawings

[0018] Figure 1 It is a structural schematic diagram of the two-speed transmission according to this embodiment;

[0019] Figure 2 It is a structural schematic view of the two-speed transmission according to this embodiment;

[0020] Figure 3 It is a structural diagram of the switching dual clutch according to this embodiment.

[0021] Explanation of the reference numerals:

[0022] 1. Two-speed transmission;

[0023] 101. Input shaft; 102. Output shaft; 103. Intermediate shaft; 104. Housing;

[0024] 2. Power motor;

[0025] 3. Switching dual clutch;

[0026] 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;

[0027] 3011. First friction plate group; 3021. Second friction plate group;

[0028] 401. First clutch; 402. Second clutch; 403. Third clutch. Detailed implementation manners

[0029] To describe in detail the technical content, structural features, achieved objectives and effects of the technical solution, the following is a detailed description in combination with specific embodiments and with reference to the accompanying drawings.

[0030] Please refer to Figures 1 to 3 , this embodiment provides a two-speed transmission for hybrid power output. The two-speed transmission includes: an input shaft, an output shaft, an intermediate shaft, a first clutch, a second clutch, a third clutch, and a housing; the center line of the input shaft is collinearly arranged 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 through the 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 the intermediate shaft conducts the power to the second clutch or the third clutch, and the second clutch or the third clutch drives the output shaft to rotate. The center line of the intermediate shaft is arranged in parallel with the center line of the input shaft in the housing; 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 and is used to drive the intermediate shaft to rotate.

[0031] In this embodiment, in order to provide a power source for the four-speed transmission 1, a power unit may be connected to the input end of the input shaft 11, and the power unit is used to drive the input shaft 11 to rotate. The power unit is an engine or a motor. The rotating end of the power motor 2 is connected to the intermediate shaft through a transmission connection member or directly connected, and together with or independently of the power unit, drives the operation of the transmission. 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 independently drive the transmission to work, and the power unit 6 can be an engine or a motor. Specifically, please refer to Figure 1 , Figure 2 , First: First, the input shaft 101 transmits power to the intermediate shaft 103 through the first clutch 401, and then the intermediate shaft 103 conducts the power to the first clutch 401 to the output shaft 102. At this time, the power motor 2 does not work. Second: First, the input shaft 101 transmits power to the intermediate shaft 103 through the first clutch 401, and then the intermediate shaft 103 conducts the power to the third clutch 403 to the output shaft 102. At this time, the power motor 2 does not work. Third: First, the input shaft 101 transmits power to the intermediate shaft 103 through the first clutch 401, and at the same time the power motor 2 also transmits power to the intermediate shaft 103, and then the intermediate shaft 103 together conducts the power to the first clutch 401 to the output shaft 102. Fourth: First, the input shaft 101 transmits power to the intermediate shaft 103 through the first clutch 401, and at the same time the power motor 2 also transmits power to the intermediate shaft 103, and then the intermediate shaft 103 together conducts the power to the third clutch 403 to the output shaft 102. Fifth: The power motor works independently, outputs power to the intermediate shaft 103, and then the intermediate shaft 103 conducts the power to the first clutch 401 to the output shaft 102. Sixth: The power motor works independently, outputs power to the intermediate shaft 103, and then the intermediate shaft 103 conducts the power to the third clutch 403 to the output shaft 102. Generally, the clutch will be 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 can 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 401 and the third clutch 403 can be friction clutches, etc.

[0032] In some embodiments, the first clutch 401 and the third clutch 403 are existing clutch structures, such as friction clutches and hydraulic clutches, and the clutch only serves to transmit power. When it is a friction clutch, a friction clutch is provided beside each gear of each gear pair. One end of the friction clutch is fixed on the input shaft 101 (or the 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 the output shaft 102) is in gear transmission, and when the friction clutch is in the disengaged state, the input shaft 101 (or the output shaft 102) is not in gear transmission. 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 together, the power motor 2 will share the load of the output shaft and achieve a hybrid output of 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 rather than 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.

[0033] 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 means of interference fit. Or the direct connection can be other embodiments, such as the output end of the power motor and one end of the intermediate shaft are connected by a coupling.

[0034] 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. Through the meshing of the gear on the power motor and the gear on the intermediate shaft, the power motor drives the output shaft to rotate.

[0035] 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 strengths of the input shaft 101 and the output shaft 102 are enhanced, thereby improving the bearing capacities 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 lengths of the multiple power motors 2 can be greatly reduced compared with one power motor 2, so that the length of the hybrid power system 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 adopt the power motors 2 of existing passenger cars, which can greatly reduce the cost.

[0036] When using existing clutches, there is a situation where both clutches are in the engaged state simultaneously, which can cause gear jamming. 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 second clutch 402 and the third clutch 403 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. The 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. Through the piston unit of the switching dual clutch 3, only the first clutch block 301 or the second clutch block 302 can be separately pushed into the engaged state, avoiding the situation of both being in the engaged state simultaneously. A first gear pair 304 is provided 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 provided on the intermediate shaft 103. A second gear pair 305 is provided between the output shaft 102 and the intermediate shaft 103. One gear of the second gear pair 305 is provided on the intermediate shaft 103, and the other gear of the second gear pair 305 is provided 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 engaging and disengaging.

[0037] In an embodiment, the switching dual clutch 3 is disposed on the output shaft 102 and is in transmission connection with the intermediate shaft 103. A first gear pair 304 is provided between the output shaft 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 disposed on the intermediate shaft 103. A second gear pair 305 is provided 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 the other gear of the second gear pair 305 is disposed on the intermediate shaft 103. The input shaft 101 and the intermediate shaft 103 are in transmission connection through the first gear pair 304, and the output shaft 102 and the intermediate shaft 103 are in transmission connection through the second gear pair 305. The first clutch block 301 (realizing the function of the second clutch 402) of the switching dual clutch 3 is used for engaging and disengaging the intermediate shaft 103 and one gear of the first gear pair 304, and the second clutch block 302 (realizing the function of the third clutch 403) of the switching dual clutch 3 is used for engaging and disengaging the intermediate shaft 103 and one 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 in engaging and disengaging. Through the above gear pairs and the switching dual clutch 3, the power of the input shaft 101 can be transmitted to the intermediate shaft 103, and then the power can be conducted from the intermediate shaft 103 to the output shaft through the second clutch 402 or the third clutch 403. By setting different gear ratios of the gear pairs on the intermediate shaft 103, the power of the intermediate shaft 103 can be transmitted to the output shaft 102 with different torques. By controlling the change of the torque in the power transmission process, the gear change of the two-speed gearbox can be realized.

[0038] In an embodiment, the piston unit only needs to be able to push left and right respectively so that the clutch blocks on both sides can be engaged and disengaged. 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 in the shape of a Chinese character 'gong', one end of the double-headed piston body 303 is disposed in the cavity, the other end of the double-headed piston body 303 is located outside the cavity, and both ends of the cavity are respectively connected to a first hydraulic unit 306 and a second hydraulic unit 307. The double-headed piston body 303 only pushes one clutch block to form an engaged state with the gear pair, so that one switching dual clutch 3 only realizes an engaged state with one gear pair, and is in a disengaged state with the other gear pair, and the situation where the clutch blocks on both sides are simultaneously engaged will not occur, making the gear shift of the transmission more accurate and flexible. At the same time, by disposing the other end of the double-headed piston body 303 outside the cavity and using it to push the clutch blocks on both sides to be engaged and disengaged, the lateral width of the double-headed piston body 303 is also reduced, thereby making the structure compact.

[0039] In an embodiment, in order to implement the clutch structure inside the clutch, the clutch method of friction plates may 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 configured to be arranged on the two side gear pairs, and the double-headed piston body 303 is configured to drive one of the first friction plate group 3011 and 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 by 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.

[0040] In this embodiment, the double-headed piston body 303 is configured 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, the two ends of the cavity of the switching double clutch 3 are respectively connected to a first hydraulic unit 306 and a second hydraulic unit 307, which are configured 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 the two ends of the cavity. Therefore, after pressurizing the hydraulic oil of 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.

[0041] It should be noted that: The first clutch only realizes the single clutch function, and an existing clutch may be adopted. Or in some embodiments, a structure the same as that of the switching double clutch may be adopted, but the clutch block on one side is not connected at all. In this way, adopting the same structure as the switching double clutch makes the clutch structures of the transmission all the same, saving costs and development cycles.

[0042] 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 structure or equivalent process transformation 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 for hybrid power output, characterized in that, The two-speed transmission includes: an input shaft, an output shaft, an intermediate shaft, a first clutch, a second clutch, a third clutch, a housing and a power motor; The center line of the input shaft and the center line of the output shaft are arranged on the same line, 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 shell and are arranged on the shell; The input shaft transmits power to the intermediate shaft through the first clutch, and then the intermediate shaft transmits power to the second clutch or the third clutch. The second clutch or the third clutch drives the output shaft to rotate. The center line of the intermediate shaft is parallel to the center line of the input shaft and is arranged in the housing. One end of the intermediate shaft is transmission-connected to the rotating end of the power motor, and the power motor is arranged outside the housing to drive the intermediate shaft to rotate; The second clutch and the third clutch are combined into a switchable double clutch structure, 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. The piston unit is used to allow the first clutch block, the second clutch block and the piston unit to be clutched; 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; The cross section of the double-headed piston body is an I-shaped one, one end of the double-headed piston body is arranged in the cavity, the other end of the double-headed piston body is located outside the cavity, and the two ends of the cavity are respectively connected to the first hydraulic unit and the second hydraulic unit; 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 disengage; The power motor is a DC power motor.

2. The two-speed transmission for hybrid 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 each intermediate shaft is connected to a power motor.

3. The two-speed transmission for hybrid 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.

Images