A torsional vibration damper with torque limiting function

Abstract

The present invention discloses a torsional vibration damper with a torque limiting function, which is fixedly mounted on an engine flywheel, and includes a torque limiting module and a torque vibration damping module, wherein the torque limiting module and the torque vibration damping module are fixedly connected together, so that the engine torque is transmitted to the torque vibration damping module through the torque limiting module. The torsional vibration damper with a torque limiting function provided by the present invention improves the reliability of transmission between the engine and the motor in a hybrid power system. This vibration damper adds a torque limiting module on the basis of a traditional torsional vibration damper. When the torque is overloaded, the torque limiting module slips and thus interrupts the torque transmission. When the overload is eliminated, the torque limiting module automatically resets and restores the torque transmission. This hybrid power-specific torsional vibration damper with a torque limiting function can filter large torque impacts and is light in weight, small in rotational inertia, small in installation space, reliable in structure, and low in cost.

Description

Technical Field

[0001] The invention relates to a hybrid power system for an automobile, and in particular to a torsional vibration damper with a torque limiting function. Background Art

[0002] There are at least two power sources in the existing automobile hybrid system. In the process of switching, coupling, and decoupling between different power sources, it is easy to generate a large torque shock in the hybrid system. If a traditional torsional vibration damper is used in the hybrid system, the transmission torque overload often occurs, causing the torsional vibration damper limit device to be directly impacted, and then the torsional vibration damper fails. The existing hybrid system uses a dual-mass flywheel to replace the torsional vibration damper, and uses the larger torsional angle of the dual-mass flywheel to absorb the instantaneous shock, but this solution can only withstand a limited torque shock, and requires a large installation space and has a high cost of use. There is also a solution to add a set of clutches between the engine and the motor to filter out the instantaneous torque shock by controlling the slip of the clutch, but this solution is not easy to deploy and greatly increases the complexity of the hardware structure and software control. Summary of the invention

[0003] In view of this, in order to improve the reliability of transmission between the engine and the motor in a hybrid power system, the present invention provides a torsional vibration damper with a torque limiting function fixedly mounted on the flywheel of the engine, which includes a torque limiting module and a torque vibration damping module, the torque limiting module and the torque vibration damping module are fixedly connected together, so that the engine torque is transmitted to the torque vibration damping module through the torque limiting module; the torque limiting module includes an external connecting flange, a ball, a ball retainer, a disc spring, a locking nut plate, and an internal connecting flange, the external connecting flange, the ball, the ball retainer and the disc spring are arranged on the periphery of the internal connecting flange, and a preset number of ball grooves that are mutually compatible with the ball are arranged on the end surface of the external connecting flange, when the ball is embedded in the ball groove of the external connecting flange, the other side of the ball is sequentially equipped with the ball retainer, the disc spring and the locking nut plate, wherein the locking nut plate and the internal connecting flange are fixedly connected together by threaded connection.

[0004] Furthermore, a preset number of ball grooves that are compatible with the balls are provided on the end face of the external connecting flange. When the balls are embedded in the ball grooves of the external connecting flange, the balls cooperate with the ball grooves to generate tangential force components when subjected to the axial force generated by the disc spring, thereby realizing torque transmission between the external connecting flange, the balls and the ball retainer.

[0005] Furthermore, when the tangential force generated by the input torque overload on the ball is greater than the tangential force generated by the disc spring on the ball, the ball disengages from the ball groove on the end face of the external connecting flange, causing the external connecting flange and the ball retainer to slip, thereby interrupting torque transmission.

[0006] Furthermore, when the torque overload is eliminated, the ball rotates an angle during the rotation of the ball retainer and enters the next ball groove and automatically resets. At this time, the tangential force generated by the disc spring on the ball is greater than the tangential force generated by the input torque on the ball, and the torque limiting module resumes the function of transmitting torque.

[0007] Furthermore, the inner ring of the ball retainer is provided with a preset number of protruding splines, and the outer ring of the inner connecting flange is provided with spline grooves that are mutually compatible with the splines of the ball retainer. When the splines of the ball retainer are embedded in the spline grooves of the inner connecting flange, torque transmission can be achieved.

[0008] Furthermore, the splines of the ball retainer are rectangular splines, and the spline grooves of the inner connecting flange are rectangular spline grooves.

[0009] Furthermore, the external connecting flange has a preset number of screw holes and pin holes, the screws are inserted into the screw holes of the external connecting flange and screwed into the engine flywheel, the pins are inserted into the pin holes of the external connecting flange and plugged into the engine flywheel, so that the torsional vibration damper with torque limiting function is fixedly mounted on the engine flywheel.

[0010] Furthermore, the locking nut plate is connected to the inner connecting flange plate via threads, and the locking nut plate is used to adjust the gap between the ball retainer and the locking nut plate.

[0011] Furthermore, the disc spring is installed between the locking nut plate and the ball retainer, and the preload force between the disc springs can be adjusted by adjusting the gap between the ball retainer and the locking nut plate to set the limit value of the overload torque.

[0012] Furthermore, the torsional vibration reduction module includes a connecting plate, a lower clamping plate, an upper clamping plate, a main vibration reduction spring, a damping plate, a spline hub, a pre-vibration reduction spring and a locating pin. The connecting plate is fixedly connected to the inner connecting flange of the torque limiting module by rivets. The lower clamping plate is arranged on the right side of the connecting plate and is clamped together with the connecting plate with a pre-tightening force. The main vibration reduction spring is located at the inner lower part of the lower clamping plate and the upper clamping plate, and the main vibration reduction spring is clamped by the lower clamping plate and the upper clamping plate; the damping plate is located at the inner lower part of the main vibration reduction spring and is in contact with the main vibration reduction spring. When the torque from the torque limiting module is transmitted to the torque vibration reduction module, the main vibration reduction spring is compressed under the action of the torque force, and cooperates with the damping plate to filter out the torsional vibration therein.

[0013] The torsional vibration damper with torque limiting function provided by the present invention improves the reliability of transmission between the engine and the motor in the hybrid power system. The damper adds a torque limiting module on the basis of the traditional torsional vibration damper. When the torque is overloaded, the torque limiting module slips and interrupts the torque transmission. When the overload is eliminated, the torque limiting module automatically resets and restores the torque transmission. The hybrid power-specific torsional vibration damper with torque limiting function can filter large torque impacts and has light weight, small moment of inertia, small installation space, reliable structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure shows an assembly diagram of a torsional vibration damper with a torque limiting function provided in one embodiment of the present invention on an engine flywheel;

[0015] Figure 2 Shown is a cross-sectional view of a torsional vibration damper with a torque limiting function provided in one embodiment of the present invention;

[0016] Figure 3 Shown Figure 2 A cross-sectional view of a torque limiting module of a torsional vibration damper having a torque limiting function;

[0017] Figure 4 Shown Figure 3 A three-dimensional schematic diagram of a ball cage of a torque limiting module;

[0018] Figure 5 Shown Figure 3 A three-dimensional schematic diagram of the inner connecting flange in the torque limiting module. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0020] It should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually merely illustrative and should not be regarded as a limitation of the present application and its applications.

[0021] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. The orientation or positional relationship indicated by the terms "upper" and "lower" is based on the manner or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1-Figure 5 As shown, a torsional vibration damper 000 with a torque limiting function provided by the present invention is fixedly mounted on an engine flywheel 5, thereby driving the torsional vibration damper 000 to move synchronously.

[0023] The torsional vibration damper 000 with torque limiting function includes a torque limiting module 1 and a torque vibration damping module 2, and the torque limiting module 1 and the torque vibration damping module 2 are fixedly connected together, so that the engine torque is transmitted to the torque vibration damping module 2 through the torque limiting module 1.

[0024] The torque limiting module 1 includes an outer connecting flange 1-1, a ball 1-2, a ball retainer 1-3, a disc spring 1-4, a locking nut plate 1-5, an inner connecting flange 1-6, and a ball retainer 1-3. Figure 2 In the up and down and left and right directions, the external connecting flange 1-1, the ball 1-2, the ball retainer 1-3 and the disc spring 1-4 are arranged on the periphery of the internal connecting flange 1-6, and a preset number of ball grooves which are mutually compatible with the ball 1-2 are arranged on the end face of the external connecting flange 1-1. When the ball 1-2 is embedded in the ball groove of the external connecting flange 1-1, the other side of the ball 1-2 is sequentially assembled with the ball retainer 1-3, the disc spring 1-4 and the locking nut plate 1-5, wherein the locking nut plate 1-5 is fixedly connected with the internal connecting flange 1-6 by threaded connection.

[0025] The inner ring of the ball retainer 1-3 is provided with a preset number of protruding splines 1-3-2, and the outer ring of the inner connecting flange 1-6 is provided with a spline groove 1-6-1 that is mutually compatible with the splines 1-3-2 of the ball retainer 1-3. When the splines 1-3-2 of the ball retainer 1-3 are embedded in the spline groove 1-6-1 of the inner connecting flange 1-6, torque transmission can be achieved. Preferably, the splines 1-3-2 of the ball retainer 1-3 are rectangular splines, and the spline groove 1-6-1 of the inner connecting flange 1-6 is a rectangular spline groove.

[0026] The external connecting flange 1-1 has a preset number of screw holes 1-1-1 and pin holes 1-1-2. The screws 6 are inserted into the screw holes 1-1-1 of the external connecting flange 1-1 and screwed into the engine flywheel 5. The pins 4 are inserted into the pin holes 1-1-2 of the external connecting flange 1-1 and plugged into the engine flywheel 5, so that the torsional vibration damper 000 with torque limiting function is fixedly installed on the engine flywheel 5.

[0027] The locking nut plate 1-5 is connected to the inner connecting flange plate 1-6 by threads, and the locking nut plate 1-5 is used to adjust the gap between the ball retainer 1-3 and the locking nut plate 1-5.

[0028] The disc spring 1-4 is installed between the locking nut plate 1-5 and the ball retainer 1-3, and the limit value of the overload torque is set by adjusting the gap between the ball retainer 1-3 and the locking nut plate 1-5.

[0029] The ball 1-2 is subjected to the axial force generated by the disc spring 1-4, and cooperates with the ball groove on the end face of the external connection flange 1-1 to generate a tangential component force, thereby realizing the torque transmission between the external connection flange 1-1, the ball 1-2 and the ball retainer 1-3. The maximum torque that the torque limiting module 1 can transmit can be set by setting the preload force of the disc spring 1-4.

[0030] When the torque overload at the input end exceeds the set value, the tangential force generated by the input torque on the ball 1-2 is greater than the tangential force generated by the disc spring 1-4 on the ball 1-2, and the ball 1-2 disengages from the ball groove on the end face of the external connecting flange 1-1, causing the external connecting flange 1-1 and the ball retainer 1-3 to slip, thereby interrupting the torque transmission.

[0031] When the torque overload is eliminated, the ball 1-2 rotates an angle and enters the next ball groove during the rotation of the ball retainer 1-3, and then automatically resets. At this time, the tangential force generated by the disc spring 1-4 on the ball 1-2 is greater than the tangential force generated by the input torque on the ball 1-2, and the torque limiting module 1 resumes the function of transmitting torque.

[0032] The torsional vibration damping module 2 includes a connecting plate 2-1, a lower clamping plate 2-2, an upper clamping plate 2-3, a main damping spring 2-4, a damping plate 2-5, a spline hub 2-6, a pre-damping spring 2-7 and a positioning pin 2-8. The connecting plate 2-1 is fixedly connected to the inner connecting flange 1-6 of the torque limiting module 1 through a rivet 3. Figure 2 From left to right and from inside to outside, the lower clamping plate 2-2 is arranged on the right side of the connecting plate 2-1 and is clamped together with the connecting plate 2-2 with a preload force. The main damping spring 2-4 is located at the inner lower part of the lower clamping plate 2-2 and the upper clamping plate 2-3, and the main damping spring 2-4 is clamped by the lower clamping plate 2-2 and the upper clamping plate 2-3; the damping plate 2-5 is located at the inner lower part of the main damping spring 2-4 and is in contact with the main damping spring 2-4. When the torque from the torque limiting module 1 is transmitted to the torque damping module 2, the main damping spring 2-4 is compressed under the action of the torque force, and cooperates with the damping plate 2-5 to filter out the torsional vibration therein.

[0033] When the engine torque is transmitted to the torque damping module 2 via the torque limiting module 1, the torsional vibration is reduced and weakened by the pre-damping spring 2-7 and the main damping spring 2-4, and finally output to the rear hybrid transmission through the spline hub 2-6.

[0034] The torsional vibration damper with torque limiting function provided by the present invention improves the reliability of transmission between the engine and the motor in the hybrid power system. The damper adds a torque limiting module on the basis of the traditional torsional vibration damper. When the torque is overloaded, the torque limiting module slips and interrupts the torque transmission. When the overload is eliminated, the torque limiting module automatically resets and restores the torque transmission. The hybrid power-specific torsional vibration damper with torque limiting function can filter large torque impacts and has light weight, small moment of inertia, small installation space, reliable structure and low cost.

[0035] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A torsional vibration damper with a torque limiting function, which is fixedly installed on an engine flywheel, and comprises a torque limiting module and a torque vibration damping module, wherein the torque limiting module and the torque vibration damping module are fixedly connected together, so that the engine torque is transmitted to the torque vibration damping module through the torque limiting module; the torque limiting module comprises an external connection flange, a ball, a ball retainer, a disc spring, a locking nut plate, and an internal connection flange, wherein the external connection flange, the ball, the ball retainer and the disc spring are arranged on the periphery of the internal connection flange, and a preset number of ball grooves that are mutually compatible with the ball are arranged on the end surface of the external connection flange, wherein the ball is embedded in the ball groove of the external connection flange, and the other side of the ball is sequentially equipped with the ball retainer, the disc spring and the locking nut plate, wherein the locking nut plate and the internal connection flange are fixedly connected together by threaded connection; The torque damping module comprises a connecting plate, a lower clamping plate, an upper clamping plate, a main damping spring, a damping plate, a spline hub, a pre-damping spring and a positioning pin. The connecting plate is fixedly connected to the inner connecting flange of the torque limiting module by rivets. The lower clamping plate is arranged on the right side of the connecting plate and is clamped with the connecting plate with a pre-tightening force. The main damping spring is located at the inner lower part of the lower clamping plate and the upper clamping plate, and the main damping spring is clamped by the lower clamping plate and the upper clamping plate. The damping plate is located at the inner lower part of the main damping spring and contacts the main damping spring. When the torque from the torque limiting module is transmitted to the torque damping module, the main damping spring is compressed under the action of the torque force, and cooperates with the damping plate to filter out the torsional vibration therein. The inner ring of the ball retainer is provided with a preset number of protruding splines, and the outer ring of the inner connecting flange is provided with spline grooves that are mutually adapted to the splines of the ball retainer. When the splines of the ball retainer are embedded in the spline grooves of the inner connecting flange, the torque transmission between the ball retainer and the inner connecting flange can be realized; The disc spring is installed between the locking nut plate and the ball retainer. By adjusting the gap between the ball retainer and the locking nut plate, the preload force between the disc springs can be adjusted to set the limit value of the overload torque.

2. A torsional vibration damper with torque limiting function according to claim 1, characterized in that: A preset number of ball grooves that are compatible with the balls are arranged on the end face of the external connecting flange. When the balls are embedded in the ball grooves of the external connecting flange, the balls cooperate with the ball grooves to generate tangential force components when subjected to the axial force generated by the disc spring, thereby realizing torque transmission between the external connecting flange, the balls and the ball retainer.

3. A torsional vibration damper with torque limiting function according to claim 1, characterized in that: When the tangential force generated by the input torque overload on the ball is greater than the tangential force generated by the disc spring on the ball, the ball disengages from the ball groove on the end face of the external connecting flange, causing the external connecting flange and the ball retainer to slip, thereby interrupting torque transmission.

4. The torsional vibration damper with torque limiting function according to claim 1, characterized in that: When the torque overload is eliminated, the ball rotates an angle and enters the next ball groove during the rotation of the ball retainer and automatically resets. At this time, the tangential force generated by the disc spring on the ball is greater than the tangential force generated by the input torque on the ball, and the torque limiting module resumes the function of transmitting torque.

5. The torsional vibration damper with torque limiting function according to claim 1, characterized in that: The splines of the ball retainer are rectangular splines, and the spline grooves of the inner connecting flange are rectangular spline grooves.

6. The torsional vibration damper with torque limiting function according to claim 1, characterized in that: The external connecting flange has a preset number of screw holes and pin holes. The screws are inserted into the screw holes of the external connecting flange and screwed into the engine flywheel. The pins are inserted into the pin holes of the external connecting flange and plugged into the engine flywheel, so that the torsional vibration damper with torque limiting function is fixedly mounted on the engine flywheel.

7. The torsional vibration damper with torque limiting function according to claim 1, characterized in that: The locking nut plate is connected to the inner connecting flange plate via threads, and the locking nut plate is used to adjust the gap between the ball retainer and the locking nut plate.

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