Test apparatus for dog clutch of vehicle

Abstract

The utility model relates to a testing device for a dog-tooth clutch of a vehicle, comprising a dog-tooth clutch having a shift gear shaft, a shift gear and an output gear, the shift gear being connected with the shift gear shaft in an anti-torque manner and being capable of axially moving; the gear shifting executing mechanism is suitable for enabling a gear shifting gear to be meshed with different output gears by controlling the axial movement of the gear shifting gear; a drive motor adapted to output a drive rotational motion; an intermediate shaft adapted to transmit a driving rotational motion to a shift gear shaft of the dog clutch; the output shaft is provided with driven gears which are respectively meshed with the output gears of the dog-tooth clutch; a load motor adapted to apply a load rotational motion to the output shaft; the control unit is suitable for adjusting the driving torque and / or the driving rotating speed of the driving motor and the load rotating speed of the load motor and sending the gear shifting signal to the gear shifting executing mechanism. The utility model can be produced cost-effectively, avoids energy waste, simplifies the simulation of the shift process and eliminates cross-effects.

Description

Technical Field

[0001] The utility model relates to the field of vehicle clutches, in particular to a testing device for a dog-tooth clutch of a vehicle. Background Art

[0002] In recent years, with the rapid development of new energy vehicle technology, electric control systems have more and more extensive application prospects in the field of vehicles. Here, the electric control system can use a grinding plate clutch or a dog clutch for the vehicle's shifting process. The dog clutch has the advantages of simple mechanical structure, fast shifting speed, and large transmission torque. Therefore, it is increasingly used as an important component of the electric drive axle to implement the automatic shifting process to meet the needs of different driving speeds and output torques. However, due to the rigid connection characteristics of the dog clutch, mechanical shock is generated during the shifting process, which adversely affects the reliability and durability of the dog clutch and its related components. Therefore, it is necessary to perform cyclic testing on the performance of the dog clutch.

[0003] In the prior art, in order to implement the cyclic test of the dog clutch, the entire axle assembly of the vehicle is installed on the test equipment, and the axle assembly includes a drive motor, a reduction gear set, a differential, a half-bridge and other components in addition to the dog clutch. For this reason, the test equipment should have a large and complex structure, and a significantly larger driving torque is required to make the axle assembly reach the preset test condition to simulate the gear shifting process, which undoubtedly causes high manufacturing costs and energy waste of the test equipment. In addition, this test equipment introduces the cross-influence factors of other components in the axle assembly into the test of the dog clutch, so that the test results cannot accurately reflect the working performance of the dog clutch. Utility Model Content

[0004] Therefore, the purpose of the utility model is to propose an improved test device for a dog clutch of a vehicle, which can be manufactured in a compact and cost-effective manner, avoid energy waste, simplify the simulation of the shifting process of the dog clutch and eliminate cross-influence as much as possible, so as to test the working performance of the dog clutch in a targeted manner.

[0005] According to a first aspect of the present utility model, a test device for a dog clutch of a vehicle is provided, wherein the test device at least comprises:

[0006] a dog clutch having a shifting gear shaft, at least one shifting gear and a plurality of output gears, the shifting gear being connected to the shifting gear shaft in a rotationally fixed manner and being axially displaceable;

[0007] - a shift actuator, the shift actuator being configured to control the axial movement of the shift gear so that the shift gear engages with different output gears to achieve a shift operation;

[0008] - a drive motor configured to output a drive rotational motion having a drive speed and a drive torque;

[0009] - an intermediate shaft configured and adapted to transmit the driving rotational movement to the shift gear shaft of the dog clutch;

[0010] - an output shaft provided with driven gears respectively meshing with the output gears of the dog clutch;

[0011] - a load motor configured and adapted to apply a load rotational motion to the output shaft, the load rotational motion having a load rotational speed; and

[0012] - a control unit configured to adjust the driving speed of the driving motor and the load torque and / or load speed of the load motor and to send a shift signal to the shift actuator.

[0013] Compared with the prior art, in the test equipment for the dog clutch of the vehicle according to the utility model, only the dog clutch and the functional units directly related to the dog clutch, namely the shift actuator, the intermediate shaft and the output shaft, in the axle assembly are tested, wherein a driving rotational motion having a driving speed is output by a driving motor, and the driving rotational motion is transmitted to the dog clutch through the intermediate shaft, so as to make the shift gear shaft reach the desired speed, and a load rotational motion having a load speed is output by a load motor, and the load rotational motion is applied to the output shaft and further transmitted to the output gear of the dog clutch through the driven gear, so that the speeds of the shift gear and the output gear of the dog clutch meet the shifting conditions, wherein the shifting process of the vehicle during driving can be simulated by adjusting the driving torque output by the driving motor, so as to test the mechanical impact of the inertia of the vehicle and the corresponding components on the dog clutch and the shift actuator, thereby eliminating the cross-influence factors of other functional units in the axle assembly and verifying the working performance of the dog clutch in a targeted manner. Furthermore, the test device can be manufactured in a compact and cost-effective manner, and the drive torque used for the test can be significantly reduced, thereby reducing energy waste.

[0014] According to an exemplary embodiment of the present invention, the control unit is configured to adjust the driving torque with an additional torque after sending the gear shift signal to simulate a mechanical shock during gear shifting.

[0015] According to an exemplary embodiment of the present utility model, the additional torque is calculated based on the input side moment of inertia, the output side moment of inertia, the input angular velocity and the output angular velocity before the gear shift, and the gear shift time, wherein the input side moment of inertia is obtained by the moment of inertia of the drive motor, the intermediate shaft, the shift gear shaft and the shift gear, and the output side moment of inertia is obtained by the moment of inertia of the output gear, the output shaft and the vehicle and possible load.

[0016] According to an exemplary embodiment of the present invention, the additional torque is applied after the shift time begins to elapse after the shift signal is sent; and / or the input side moment of inertia and the output side moment of inertia are pre-calculated and stored in the control unit.

[0017] According to an exemplary embodiment of the present utility model, the control unit is configured to adjust the driving speed of the driving motor and / or the load speed of the load motor to change the angular velocity difference between the input angular velocity and the output angular velocity.

[0018] According to an exemplary embodiment of the present utility model, the test device includes an input sensor, which is configured to detect the driving torque and / or the driving speed of the driving motor; and / or the test device includes an output sensor, which is configured to detect the load torque and / or the load speed of the load motor.

[0019] According to an exemplary embodiment of the utility model, the dog clutch includes a plurality of shift gears and an output gear is respectively arranged on both axial sides of each shift gear, so that the total gear position of the dog clutch is twice the number of the shift gears; and / or, the shift gear is mounted on the shift gear shaft in the form of a spline.

[0020] According to an exemplary embodiment of the utility model, the first motor shaft of the drive motor is connected to the intermediate shaft in a torsionally fixed manner in the form of a spline; and / or the output shaft is connected to the second motor shaft of the load motor in a transmission manner in the form of a belt connection.

[0021] According to an exemplary embodiment of the present utility model, the test device includes a substrate, which is configured to carry other components of the test device; and / or the test device has an encapsulation shell, in which at least the dog clutch and the shift actuator are arranged.

[0022] According to an exemplary embodiment of the present utility model, the shift actuator includes a shift fork and a shift motor, the shift motor is communicatively connected to the control unit and is configured to drive the shift fork according to the shift signal, thereby controlling the axial movement of the shift gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in more detail below with reference to the accompanying drawings, so that the principles, features and advantages of the present invention can be better understood. The accompanying drawings include:

[0024] Figure 1 A schematic connection block diagram of a test device for a dog clutch of a vehicle according to an exemplary embodiment of the present utility model is shown;

[0025] Figure 2 A schematic perspective view of a test device for a dog clutch of a vehicle according to an exemplary embodiment of the present utility model is shown;

[0026] Figure 3 Shows Figure 2 A partial stereoscopic view of . DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and a number of exemplary embodiments.

[0028] It should be understood that, in this document, the expressions "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.

[0029] In this specification, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the meanings of the above terms in this disclosure can be understood according to the circumstances.

[0030] Figure 1 A schematic connection block diagram of a test device 100 for a dog clutch 10 of a vehicle according to an exemplary embodiment of the present invention is shown. Figure 2 A schematic perspective view of a test device 100 for a dog clutch 10 of a vehicle according to an exemplary embodiment of the present invention is shown. Figure 3Shows Figure 2 Here, the vehicle is in particular an electric vehicle.

[0031] like Figures 1 to 3 As shown, the test device 100 according to the utility model includes a dog clutch 10, which has a shift gear shaft 11, at least one shift gear 12 and a plurality of output gears 13, wherein the shift gear 12 is connected to the shift gear shaft 11 in a torsion-proof manner, so that the shift gear 12 can rotate with the shift gear shaft 11, and the shift gear 12 can move axially along the shift gear shaft 11. In particular, the shift gear 12 is sleeved on the shift gear shaft 11 in the form of a spline, wherein an internal spline is provided on the inner circumference of the shift gear 12, and an external spline matching the internal spline is provided on the outer circumference of the shift gear shaft 11, and the torsion-proof connection between the shift gear 12 and the shift gear shaft 11 is achieved through the meshing of the internal spline and the external spline. Here, the output gears 13 are arranged on both sides of the shift gear 12 in the axial direction. When the shift gear 12 moves axially along the shift gear shaft 11 until it meshes with the output gear 13 on the side, the output gear can further transmit the rotational movement of the shift gear shaft 11 outward. Different output gears 13 have different numbers of teeth. When the shift gear 12 and different output gears 13 are meshed, a corresponding shifting process can be achieved, and the transmission ratio can be changed through the shifting process. In addition, when the shift gear 12 is not meshed with any output gear 13, the dog clutch 10 is in neutral and does not output power outward through the output gear 13.

[0032] like Figures 1 to 3 As shown, the test device 100 includes a shift actuator 20, which can control the axial movement of the shift gear 12 of the dog clutch 10 to make the shift gear 12 mesh with different output gears 13 to achieve a shift operation. Exemplarily, the shift actuator 20 may include a shift motor 21 and a shift fork 22, wherein the shift motor 21 may drive the shift fork 22 according to the received shift signal, and the shift fork converts the rotational motion output by the shift motor 21 into a linear motion and causes the shift gear 12 to perform a corresponding axial movement. However, it is also conceivable that the shift actuator 20 is constructed as a hydraulic mechanism.

[0033] like Figures 1 to 3As shown, the test device 100 includes a drive motor 30 and an intermediate shaft 40, wherein the drive motor 30 is configured to output a drive rotational motion through a first motor shaft 31, and the drive rotational motion has a drive speed and a drive torque, and the intermediate shaft 40 is arranged between the drive motor 30 and the dog clutch 10 and is configured to transmit the drive rotational motion to the shifting gear shaft 11 of the dog clutch 10 to drive the shifting gear shaft 11 and the shifting gear 12 to rotate, wherein the drive motor 30 is configured as a servo motor, for example, and can have a speed mode and a torque mode, in which the drive motor 30 can adjust the drive speed output by the first motor shaft 31 in the speed mode, and in which the drive motor 30 can adjust the drive torque output by the first motor shaft 31 in the torque mode. It is possible that the first motor shaft 31 of the drive motor 30 and the intermediate shaft 40 are meshedly connected via a first-stage gear pair, and the intermediate shaft 40 and the shifting gear shaft 11 are meshedly connected via a second-stage gear pair, as shown in FIG. Figure 1 However, it is also possible that the first motor shaft 31 of the drive motor 30 is connected to the intermediate shaft 40 in a splined manner to prevent rotation in order to reduce transmission losses, such as Figure 2 and Figure 3 As shown.

[0034] like Figures 1 to 3 As shown, the test equipment 100 includes an output shaft 50, which is provided with driven gears 51 respectively meshed with each output gear 13 of the dog clutch 10. When the dog clutch 10 completes the shifting process, the output gear 13 meshed with the shifting gear 12 can further transmit the driving torque to the driven gear 51 meshed therewith.

[0035] For example, the dog clutch 10 includes a plurality of shift gears 12 and an output gear 13 is provided on both axial sides of each shift gear 12, and a meshing driven gear 51 is provided for each output gear 13, so that the total gear position of the dog clutch 10 is twice the number of the shift gears 12 or equal to the number of the output gears 13, wherein the number of teeth of each output gear 13 is different, so that different transmission ratios can be achieved through the shifting process. Figure 1 As shown, the dog clutch 10 includes two shift gears 12, and an output gear 13 is provided on both axial sides of each shift gear 12, that is, a total of four output gears 13 are provided, so that the dog clutch 10 can achieve four gears. Of course, it is also possible to consider providing other numbers of shift gears 12 that are considered meaningful in the art, such as three.

[0036] like Figure 1As shown, the test device 100 includes a load motor 60, which is configured to output a load rotational motion through a second motor shaft 61, wherein the load rotational motion has a load speed, and the load rotational motion is applied to the output shaft 50, wherein the load torque output by the load motor 60 can be used to simulate the rolling resistance of the vehicle on the road, wherein the load motor 60 is, for example, configured as an asynchronous motor and can only actively adjust the output load speed. In this case, there is no need to set components in the axle assembly that are not directly related to the dog clutch 10, such as a differential, a half-bridge, etc., in the test device 100, thereby greatly reducing the driving torque used for testing and making the entire test device 100 compactly constructed, thereby reducing the manufacturing cost of the test device 100 and reducing energy waste. Here, the output shaft 50 can be connected to the second motor shaft 61 in a torsionally fixed manner via a gear pair, such as Figure 1 However, it is also possible that the output shaft 50 is connected to the second motor shaft 61 of the load motor 60 in a driving manner in the form of a belt connection to mitigate impact and vibration loads and avoid overload.

[0037] like Figure 1 As shown, the test device 100 includes a control unit 70, which is respectively connected to the drive motor 30, the load motor 60 and the shift actuator 20, especially the shift motor 21 in communication, especially directly electrically connected, to adjust the drive torque and / or drive speed of the drive motor 30 and the load torque and / or load speed of the load motor 60 and send a shift signal to the shift actuator 20. The test process for the dog clutch 10 can be controlled by the control unit 70.

[0038] For example, during the test, the dog clutch 10 is first placed in a neutral state to prevent unexpected mechanical damage; then the drive motor 30 and the load motor 60 are operated at different speeds by adjusting the drive speed and the load speed until they are stable, wherein the shift gear 12 of the dog clutch 10 reaches an input angular velocity under the action of the drive speed, and the output gear 13 of the dog clutch 10 reaches an output angular velocity under the action of the load speed, and the angular velocity difference between the input angular velocity and the output angular velocity should be within a preset range to meet the shifting condition; then a shift signal is sent to the shift actuator 20 to place the dog clutch 10 in a desired gear through the shifting process; after sending the shift signal, the drive torque of the drive motor 30 is adjusted with an additional torque to simulate the mechanical impact during the shifting; the data of various working parameters, such as the drive torque of the drive motor 30 and the load torque of the load motor 60, are recorded, and the dog clutch 10 is restored to a neutral state. Thus, a test cycle is completed. The test cycle may be repeated multiple times until test results on the reliability and durability of the dog clutch 10 are obtained.

[0039] For example, the additional torque set to simulate the mechanical impact during gear shifting can be calculated based on the input side moment of inertia J1, the output side moment of inertia J2, the input angular velocity ω1 before gear shifting, the output angular velocity ω2 before gear shifting, and the gear shifting time Δt, wherein the input angular velocity ω1 before gear shifting corresponds to the angular velocity of the shifting gear 12, the output angular velocity ω2 before gear shifting corresponds to the angular velocity of the output gear 13, and the angular velocities of both become the angular velocity ω3 after gear shifting. Here, the input side moment of inertia J1 is jointly derived from the moment of inertia of the drive motor 30, the intermediate shaft 40, the shifting gear shaft 11, and the shifting gear 12, while the output side moment of inertia J2 is jointly derived from the moment of inertia J2 of the output gear 13, the output shaft 50, and the vehicle and possible load, and the load can be derived from experimental data and / or empirical data. In particular, the input side moment of inertia J1 and the output side moment of inertia J2 are pre-calculated and stored in the control unit 70.

[0040] Here, according to the principle of conservation of momentum, the sum of the input side angular momentum and the output side angular momentum before the gear shift should be equal to the sum of the input side angular momentum and the output side angular momentum after the gear shift, that is,

[0041] J1*ω1+J2*ω2=(J1+J2)*ω3

[0042] Therefore, the angular velocity ω3 after the gear shift can be calculated based on the input side moment of inertia J1, the output side moment of inertia J2, the input angular velocity ω1 before the gear shift, and the output angular velocity ω2. Then, the mechanical impact torque M during the gear shift can be calculated based on the difference between the angular velocity ω3 after the gear shift and the input angular velocity ω1 before the gear shift, combined with the input side moment of inertia J1 and the gear shift time Δt, that is,

[0043]

[0044] By using the mechanical impact torque M as an additional torque to adjust the driving torque of the driving motor 30, the gear shifting situation during the actual driving of the vehicle can be accurately simulated during the testing process of the testing equipment 100, thereby obtaining the performance of the dog clutch 10 during actual driving.

[0045] For example, the additional torque is applied after the shifting time Δt has elapsed since the shifting signal is sent, and the shifting time can be obtained from experimental data and / or empirical data, so as to more realistically simulate the mechanical impact in the actual shifting process.

[0046] For example, the control unit 70 can adjust the driving speed of the driving motor 30 and the load speed of the load motor 60 to change the angular velocity difference between the input angular velocity ω1 and the output angular velocity ω2, thereby more flexibly testing different driving conditions.

[0047] For example, Figure 2 As shown, the test device 100 further includes an input sensor 71 and an output sensor 72, wherein the input sensor is configured to detect the driving torque and / or driving speed of the driving motor 30, and the output sensor is configured to detect the load torque and / or load speed of the load motor 60. Based on the detection results of the input sensor 71 and the output sensor 72, the additional torque can be calculated more accurately and the test result can be verified.

[0048] For example, Figure 2 As shown, the test device 100 includes a base plate 80, which is configured to carry other components of the test device 100. The base plate 80 can make the test process more smoothly implemented and reduce the test noise as much as possible.

[0049] For example, Figure 2 As shown, the test device 100 has a packaging housing 90, and at least the dog clutch 10 and the shift actuator 20 are arranged in the packaging housing 90. For the sake of simplicity, the packaging housing 90 is shown in FIG. Figure 2 The encapsulation housing 90 can protect the dog clutch 10 and the shift actuator 20 from the influence of the external environment to ensure the smooth implementation of the shifting process. It is also possible that the intermediate shaft 40 and the output shaft 50 are also arranged in the encapsulation housing 90.

[0050] The above explanation of the embodiments only describes the present invention within the framework of the examples. Of course, as long as it makes sense technically, the individual features of the embodiments can be freely combined with each other without departing from the framework of the present invention.

[0051] Other advantages and alternative embodiments of the present invention are obvious to those skilled in the art. Therefore, the present invention in its broader sense is not limited to the specific details, representative structures and exemplary embodiments shown and described. On the contrary, those skilled in the art can make various modifications and substitutions without departing from the basic spirit and scope of the present invention.

Claims

1. A test device (100) for a dog clutch (10) of a vehicle, characterized in that: The testing device (100) comprises at least: - a dog clutch (10), the dog clutch (10) having a shift gear shaft (11), at least one shift gear (12) and a plurality of output gears (13), the shift gear (12) being connected to the shift gear shaft (11) in a rotationally fixed manner and being axially movable; - a gear shift actuator (20), the gear shift actuator (20) being configured to control the axial movement of the gear shift gear (12) so as to mesh the gear shift gear (12) with different output gears (13) to achieve a gear shift operation; - a drive motor (30) configured to output a drive rotational motion having a drive speed and a drive torque; - an intermediate shaft (40) configured and adapted to transmit the driving rotational movement to the shift gear shaft (11) of the dog clutch (10); - an output shaft (50), the output shaft (50) being provided with driven gears (51) respectively meshing with the output gears (13) of the dog clutch (10); - a load motor (60) configured and adapted to apply a load rotational motion to the output shaft (50), the load rotational motion having a load rotational speed; and - A control unit (70) configured to adjust the drive torque and / or drive speed of the drive motor (30) and the load speed of the load motor (60) and send a shift signal to the shift actuator (20).

2. The test device (100) according to claim 1, characterized in that The control unit (70) is configured to adjust the driving torque with an additional torque after sending the gear shift signal to simulate a mechanical shock during gear shifting.

3. The test device (100) according to claim 2, characterized in that The additional torque is calculated based on the input side moment of inertia, the output side moment of inertia, the input angular velocity and the output angular velocity before the gear shift, and the gear shift time, wherein the input side moment of inertia is obtained from the moment of inertia of the drive motor (30), the intermediate shaft (40), the shift gear shaft (11) and the shift gear (12), and the output side moment of inertia is obtained from the moment of inertia of the output gear (13), the output shaft (50) and the vehicle and possible load.

4. The test device (100) according to claim 3, characterized in that The additional torque is applied after the shift time has elapsed since the shift signal was sent; and / or The input-side moment of inertia and the output-side moment of inertia are calculated in advance and stored in the control unit (70).

5. The test device (100) according to any one of claims 1 to 4, characterized in that The control unit (70) is configured to adjust the driving speed of the driving motor (30) and / or the load speed of the load motor (60) to change the angular velocity difference between the input angular velocity and the output angular velocity.

6. The test device (100) according to any one of claims 1 to 4, characterized in that The test device (100) comprises an input sensor (71), wherein the input sensor (71) is configured to detect the driving torque and / or the driving speed of the driving motor (30); and / or The test device (100) includes an output sensor (72) configured to detect a load torque and / or a load speed of the load motor (60).

7. The test device (100) according to any one of claims 1 to 4, characterized in that The dog clutch (10) comprises a plurality of shift gears (12) and an output gear (13) is provided on both axial sides of each shift gear (12), so that the total gear position of the dog clutch (10) is twice the number of the shift gears (12); and / or The shift gear (12) is mounted on the shift gear shaft (11) in the form of a spline.

8. The test device (100) according to any one of claims 1 to 4, characterized in that The first motor shaft (31) of the drive motor (30) is connected to the intermediate shaft (40) in a rotationally fixed manner in the form of a spline; and / or The output shaft (50) is transmission-connected to the second motor shaft (61) of the load motor (60) in a belt-connected manner.

9. The test device (100) according to any one of claims 1 to 4, characterized in that The test device (100) comprises a base plate (80), the base plate (80) being configured to carry other components of the test device (100); and / or The test device (100) has a packaging housing (90), and at least the dog clutch (10) and the shift actuator (20) are arranged in the packaging housing (90).

10. The test device (100) according to any one of claims 1 to 4, characterized in that The shift actuator (20) comprises a shift fork (22) and a shift motor (21), wherein the shift motor (21) is communicatively connected to the control unit (70) and is configured to drive the shift fork (22) according to the shift signal, thereby controlling the axial movement of the shift gear (12).

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