WO2021138865A1

WO2021138865A1 - Vibration damping transmission mechanism and power transmission system

Info

Publication number: WO2021138865A1
Application number: PCT/CN2020/071109
Authority: WO
Inventors: 夏天雷; 姚晨旭; 毛乐
Original assignee: 舍弗勒技术股份两合公司; 夏天雷
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2021-07-15
Also published as: CN113383180A; CN113383180B

Abstract

A vibration damping transmission mechanism and a power transmission system. The vibration damping transmission mechanism not only comprises a housing (1) and a flange (2) and a vibration damping spring (3) which are provided in the housing (1), but also comprises a buffer part, preferably a buffer spring (4), which is integrally fixed to the housing (1) and protrudes to the interior of the housing (1). At least after the torque transmission direction between the flange (2) and the housing (1) changes, the flange (2) can pass through the buffer spring (4) during relative rotation, and contact the buffer spring (4) in a manner of rotating relative to the buffer spring (4), so that the buffer spring (4) is deformed and has a damping effect on the flange (2).

Description

Vibration damping transmission mechanism and power transmission system

Technical field

The present invention relates to the field of vehicles, and in particular to a damping transmission mechanism for vehicles and a power transmission system including the damping transmission mechanism.

Background technique

In a hybrid power system with a P0 architecture, the motor and the engine are connected through a belt wheel or sprocket with a vibration damping function, and the engine is connected with the input shaft of the transmission. In this way, on the one hand, the engine can be started via the electric motor; on the other hand, the engine in a normal working state can drive the electric motor to generate electricity while transmitting drive torque to the transmission.

Figure 1 shows a partial structure of the aforementioned pulley or sprocket. Similar to the damping structure in an engine flywheel, the pulley or sprocket includes a housing 1 and a flange 2 arranged in the housing 1 and multiple sets (for example, two sets) of damping springs 3. The flange 2 can perform a predetermined range of relative rotation relative to the housing 1 in the circumferential direction C. During the relative rotation, the abutting portion 21 of the flange 2 can abut the corresponding damping spring 3, so that the flange 2 In the process of transmitting torque with the housing 1 via the damping spring 3, the damping spring 3 can attenuate torsional vibration. The two

axial end plates

11, 12 facing each other in the axial direction A of the housing 1 are formed with

protrusions

11P, 12P facing each other, and the arc-shaped damping spring 3 is installed adjacent to each other in the circumferential direction C Between the raised

portions

11P and 12P. When the pulley or sprocket does not transmit torque, the abutting portion 21 of the flange 2 is located between the two

convex portions

11P, 12P facing each other in the axial direction A (as shown in FIG. 1).

The above-mentioned belt wheel or sprocket can start the engine by belt start or key start, and the engine can drive the motor in turn after normal operation. However, in the above process, the torque transmission direction between the flange 2 and the housing 1 will change, which will cause the abutment portion 21 of the flange 2 to be connected to one of the two adjacent damping springs 3 After being out of contact, the other damping spring is impacted more violently. Since there is no mechanism to reduce such shocks in the above-mentioned pulleys or sprockets, such shocks generate unexpected noises, resulting in deterioration of the NVH performance of the entire hybrid power system.

Summary of the invention

The purpose of the present invention is to overcome or at least alleviate the above-mentioned drawbacks. An object of the present invention is to provide a damping transmission mechanism that can reduce the impact between the flange and the damping spring caused by the change in the torque transmission direction between the flange and the housing as described above. Another object of the present invention is to provide a power transmission system including the above-mentioned damping transmission mechanism.

In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions.

The present invention provides a damping transmission mechanism, which has axial, radial and circumferential directions and includes:

case;

A plurality of damping springs, the plurality of damping springs are installed in the housing in a manner of being spaced apart from each other along the circumferential direction;

The flange is located in the housing, and during the relative rotation of the flange relative to the housing along the circumferential direction, the damping spring of the flange is located adjacent to The part in between can be pressed against the damping spring, so that the flange and the housing transmit torque via the damping spring; and

The cushioning component is arranged in the housing in a manner that the whole is fixed relative to the housing and is pierced out toward the inside of the housing. The flange can rotate relative to the cushioning component during the rotation process. The method is in contact with the buffer member, so that the buffer member has a damping effect on the flange.

Preferably, the flange includes abutting portions extending between two adjacent damping springs in the circumferential direction, and each abutting portion corresponds to two oppositely disposed in the axial direction. A pair of said cushioning parts.

More preferably, the minimum distance of the pair of buffer members in the axial direction is smaller than the maximum thickness of the abutting portion in the axial direction, so that the abutting portion rotates past the pair of buffers The component can be in contact with both the pair of buffer components during the process.

More preferably, each of the buffering members includes two ends of the axial end plate of the housing and a reeling portion located between the two ends, and the reeling portions of the pair of buffering members are located between the two ends of the axial end plate of the housing. The axial directions are opposite to each other.

More preferably, the two axial end plates of the housing are respectively formed with protrusions protruding toward each other in the axial direction, and both ends of the buffer member are fixed to the protrusions. unit.

More preferably, the two axial end plates of the housing are respectively formed with protrusions protruding toward each other in the axial direction, and one of the two ends is fixed to the protrusion. The other end of the two ends is a free end.

More preferably, the two ends of the buffer member straddle the top of the protrusion and are bent toward the bottom of the protrusion.

More preferably, the damping spring is an arc-shaped coil spring, and the arc-shaped coil spring extends along the circumferential direction and is installed between two adjacent protrusions in the circumferential direction.

More preferably, the circumferential two end edges of the abutting portion are chamfered.

The present invention also provides a power transmission system as follows, which includes a motor, an engine, and the damping transmission mechanism according to any one of the above technical solutions, and the motor is connected to the engine via the damping transmission mechanism. The transmission is coupled so that the electric motor can be used to start the engine and be driven by the engine to generate electricity.

By adopting the above technical solution, the present invention provides a new type of damping transmission mechanism and a power transmission system including the damping transmission mechanism. The damping transmission mechanism not only includes a shell, a flange and a damping spring arranged in the shell, but also includes a buffer spring that is integrally fixed to the shell and slanted into the shell. At least after the torque transmission direction between the flange and the housing changes, the flange can pass through the buffer spring during relative rotation, and contact the buffer spring in a manner of rotating relative to the buffer spring, so that the buffer spring is deformed and corrects. Lan has a damping effect.

In this way, it is possible to reduce the speed of the flange when the flange passes the buffer spring and is in contact with the buffer spring, thereby reducing the above-mentioned change in the torque transmission direction between the flange and the housing caused by the flange and the damping spring The impact generated in the meantime, thereby reducing or eliminating the undesired noise generated by such impact. As a result, it is possible to improve the NVH performance of the power transmission system including the damping transmission mechanism.

Description of the drawings

Fig. 1 is a schematic cross-sectional view showing a partial structure of a pulley or sprocket with a vibration damping function.

Fig. 2a is a perspective schematic diagram showing a partial structure of the damping transmission mechanism according to the first embodiment of the present invention; Fig. 2b is a schematic cross-sectional view showing a partial structure of the damping transmission mechanism in Fig. 2a; 2c is a perspective schematic diagram showing a partial structure of the flange of the vibration damping transmission mechanism in FIG. 2a.

Fig. 3a is a perspective perspective schematic diagram showing a partial structure of the damping transmission mechanism according to the second embodiment of the present invention; Fig. 3b is a schematic cross-sectional view showing a partial structure of the damping transmission mechanism in Fig. 3a

Description of Reference Signs

1 Housing 11 First axial end plate 11P First protruding part 12 Second axial end plate 12P Second protruding part 13 Annular outer peripheral part 2 Flange 21 Abutment part 21 T tapered part 22 Flange body 3 Reduce Vibration spring 4 buffer spring 41 bulge 42 end

A axis and C circumferential direction.

Detailed ways

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. It should be noted that in the present invention, "axial direction", "radial direction", and "circumferential direction" respectively refer to the axial, radial, and circumferential directions of the damping transmission mechanism that is substantially cylindrical as a whole.

Hereinafter, the structure of the damping transmission mechanism according to the first embodiment of the present invention will be described with reference to the accompanying drawings.

(Structure of the damping transmission mechanism according to the first embodiment of the present invention)

As shown in Figs. 2a and 2b, the damping transmission mechanism according to the first embodiment of the present invention has a substantially cylindrical shape as a whole. The damping transmission mechanism includes a housing 1, a flange 2, a plurality of damping springs 3 and a plurality of buffer springs 4 assembled together.

Specifically, in the present embodiment, a storage space for accommodating other components is formed inside the housing 1. The housing 1 includes two axial end plates (a first axial end plate 11 and a second axial end plate 12) and an annular outer peripheral portion 13 fixed together.

The two

axial end plates

11, 12 are opposed to each other in the axial direction A and are respectively formed with protrusions (a first protrusion 11P and a second protrusion 12P) protruding toward each other in the axial direction A. On the one hand, the

protrusions

11P, 12P are used as the circumferential end stop of the damping spring 3. The damping spring 3 is installed between the

adjacent protrusions

11P, 12P in the circumferential direction C and is convex in the circumferential direction C. The raised

portions

11P, 12P are constrained; on the other hand, the raised

portions

11P, 12P are also used to install the buffer spring 4, so that when the following abutting portion 21 of the flange 2 rotates past the raised

portions

11P, 12P The buffer spring 4 contacts. The distance in the axial direction A between the pair of

protrusions

11P and 12P protruding toward each other can be appropriately adjusted according to the height of the buffer spring 4.

The outer surface of the annular outer peripheral portion 13 is formed with a set of grooves for installation of the transmission belt. The annular outer peripheral portion 13 may be formed integrally with the second axial end plate 12 and fixedly installed with the first axial end plate 11. In this way, the above-mentioned accommodating space is surrounded by two

axial end plates

11, 12 and an annular outer peripheral portion 13.

In this embodiment, the flange 2 is located in the housing 1. As shown in FIG. 2c, the flange 2 includes a disk-shaped flange main body 22 and an abutting portion 21 extending from the flange main body 22 toward the radially outer side. Each abutting portion 21 has a fan shape, and circumferential both end edges of the abutting portion 21 are formed to form a tapered portion 21T by chamfering. The number of abutting parts 21 is the same as the number of damping springs 3. In the initial state, each abutting portion 21 is located between the corresponding pair of

convex portions

11P and 12P in the axial direction A, that is, between two adjacent damping springs 3 in the circumferential direction C.

In this way, during the relative rotation of the flange 2 relative to the housing 1 along the circumferential direction C, the abutment portion 21 of the flange 2 located between the adjacent damping springs 3 can be pressed against the corresponding damping spring 3, so that the damping spring 3 can attenuate the torsional vibration during the torque transmission between the flange 2 and the housing 1 via the damping spring 3.

In this embodiment, each damping spring 3 is an arc-shaped coil spring extending along the circumferential direction C. The plurality of damping springs 3 are installed in the housing 1 in a manner of being spaced apart from each other along the circumferential direction C. In the initial state, each damping spring 3 is constrained by the

adjacent protrusions

11P and 12P in the circumferential direction C, and each damping spring 3 is constrained by the annular outer peripheral portion 13 and the flange body 22 in the radial direction, each The damping spring 3 is constrained by the two

axial end plates

11 and 12 in the axial direction.

In this embodiment, the cushion spring 4 is preferably a leaf spring made of spring steel. Each buffer spring 4 includes two ends 42 of the

protrusions

11P and 12P provided on the

axial end plates

11 and 12 of the housing 1 and a reel 41 located between the two ends 42.

Each abutting portion 21 corresponds to two pairs of buffer springs 4 disposed oppositely in the axial direction A. The pair of buffer springs 4 includes a buffer spring 4 mounted on the first protrusion 11P of the first axial end plate 11 and a mounting The buffer spring 4 at the second protrusion 12P of the second axial end plate 12. The bulging portions 41 of the pair of buffer springs 4 are opposed to each other in the axial direction A, and the portions where the degree of bulging of the pair of buffer springs 4 are greatest face each other. As shown in Fig. 2b, the distance L between the parts with the largest bulging degree of the pair of buffer springs 4 in the axial direction A (ie the smallest distance between the pair of buffer springs 4 in the axial direction A) L is smaller than The maximum thickness T of 21 in the axial direction A is such that when the abutting portion 21 of the flange 2 rotates past a pair of buffer springs 4, it can contact the pair of buffer springs 4. In this way, at least after the torque transmission direction between the flange 2 and the housing 1 changes, the abutment portion 21 of the flange 2 can pass through the buffer spring 4 during relative rotation, and rotate relative to the buffer spring 4 In contact with the buffer spring 4, the buffer spring 4 is deformed and the abutment portion 21 of the flange 2 is damped, thereby reducing the method caused by the change of the torque transmission direction between the flange 2 and the housing 1 as described above. The impact generated between the flange 2 and the damping spring 3, thereby reducing or eliminating the undesired noise generated by such impact.

In addition, in this embodiment, both ends 42 of the buffer spring 4 can be fixed to the corresponding

protrusions

11P, 12P by, for example, welding, so that the buffer spring 4 is fixed to the housing 1 as a whole. The shell 1 is turned out toward the inside of the shell 1. Therefore, the cushion spring 4 relies on the elastic deformation of its bulged portion to generate a damping effect on the abutting portion 21 of the flange 2.

The structure of the damping transmission mechanism according to the first embodiment of the present invention has been described above, and the structure of the damping transmission mechanism according to the second embodiment of the present invention will be described below with reference to the accompanying drawings.

(Structure of the damping transmission mechanism according to the second embodiment of the present invention)

As shown in Figures 3a and 3b, the basic structure of the damping transmission mechanism according to the second embodiment of the present invention is substantially the same as the basic structure of the damping transmission mechanism according to the first embodiment of the present invention. The difference between the people.

In this embodiment, the two ends 42 of the cushion spring 4 straddle the tops of the

bosses

11P and 12P and are bent toward the bottoms of the

bosses

11P and 12P. One end of the two ends 42 is fixed to the

bosses

11P and 12P by welding, for example, and the other end of the two ends 42 is a free end. In this way, the cushion spring 4 has a force-deformation characteristic curve different from that of the first embodiment. Through experimentation and comparison, this embodiment can achieve a better damping effect.

The present invention also provides a power transmission system, which includes a motor, an engine, and a damping transmission mechanism with the above structure. The motor is connected to the engine via a vibration reduction transmission mechanism and other necessary components (such as a transmission belt or a transmission chain), so that the motor can be used to start the engine and be driven by the engine to generate electricity, thereby preferably forming a 48V hybrid power with a P0 architecture system.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications to the above-mentioned embodiments of the present invention under the teaching of the present invention without departing from the scope of the present invention. In addition, the following supplementary explanation is given.

(i) Although it is described in the above specific embodiments that only one buffer spring is provided for one

protrusion

11P, 12P, the present invention is not limited to this. For example, one

protrusion

11P, 12P may be provided with a plurality of buffer springs 4, so that one abutting portion 21 of the flange 2 not only corresponds to a pair of buffer springs 4. The arrangement number of the buffer spring 4 can be adjusted appropriately according to the size of the required damping effect; of course, the material of the buffer spring can be selected from metal materials, or non-metal elastic materials such as rubber and plastic; the form of the buffer spring is also not available. It is not limited to the structure shown in the embodiment. According to the material of the buffer spring and the damping requirements that need to be met, those skilled in the art can set the buffer spring into a structure of other shapes such as a pile, honeycomb, or wave shape.

(ii) Although not explicitly described in the above specific embodiments, it should be understood that the height of the bulging portion of the cushion spring 4 can be designed according to the force-deformation characteristic curve to ensure a specific damping effect. At the same time, the pair of buffer members is not limited to the form of the pair of buffer springs in the embodiment, and one may be a spring member while the other is not an elastic member. The spring member presses the abutment portion 21 of the flange 2 to act on the opposite A damping effect is generated on the non-elastic component; or a pair of cushioning components are both non-elastic components, and the abutting portion 21 of the flange 2 receives a damping effect when passing between the two non-elastic components.

(iii) In the present invention, the change of the torque transmission direction between the flange 2 and the housing 1 includes two situations where the damping transmission mechanism has just started to generate torque from the initial state and the torque transmission direction changes under the normal working state. Further, after the torque transmission direction changes so that the abutment portion 21 of the flange 2 passes through the buffer spring 4, the abutment portion 21 of the flange 2 can pass through the gap between the two buffer springs 4, so that the abutment portion 21 The two buffer springs 4 move from one side to the other side in the circumferential direction; or a part of the abutting portion 21 of the flange 2 can stay in the above gap, and the other part is located outside the gap.

(iv) During the relative rotation of the flange 2 with respect to the housing 1 along the circumferential direction C, when the abutting portion 21 of the flange 2 rotates past the buffer spring 4, the abutting portion 21 contacts the buffer spring 4, so that the buffer spring 4 is deformed substantially in the axial direction A and at the same time produces a damping effect on the abutting portion 21. This damping effect does not affect the torsional vibration damping effect (damping effect) provided by the vibration damping spring 3. In other words, the buffer spring 4 generates the above-mentioned damping effect only when the damping transmission mechanism is just started or when the direction of the torque transmitted through the damping transmission mechanism changes.

(v) In the power transmission system according to the present invention (for example, a 48V hybrid power system with a P0 architecture), the damping transmission mechanism does not affect the normal operation of the engine's idling, driving, power generation, and braking energy recovery modes.

(vi) Although in the above specific embodiments only the damping spring 3 is described as an arc-shaped coil spring, the present invention is not limited to this. The damping spring 3 may also be a linear coil spring.

Claims

A damping transmission mechanism, which has an axial direction (A), a radial direction and a circumferential direction (C) and includes:

Shell (1);

A plurality of damping springs (3), the plurality of damping springs (3) are installed in the housing (1) in a manner of being spaced apart from each other along the circumferential direction (C);

Flange (2), the flange (2) is located in the housing (1), and the flange (2) is opposite to the housing (1) along the circumferential direction (C) During the rotation, the part of the flange (2) located between the adjacent damping springs (3) can be pressed against the damping spring (3), so that the flange (2) and The housing (1) transmits torque via the damping spring (3); and

A buffer component, the buffer component is arranged in the housing (1) in a manner that the entirety is fixed relative to the housing (1) and is drawn out toward the housing (1), and the flange (2) is rotating During the process, it can contact the buffer member in a manner of rotating relative to the buffer member, so that the buffer member has a damping effect on the flange (2).
The damping transmission mechanism according to claim 1, characterized in that, the flange (2) comprises two damping springs (3) that are adjacent to each other in the circumferential direction (C). The abutting portions (21), each of the abutting portions (21) corresponds to two at least one pair of the cushioning members disposed oppositely in the axial direction (A).
The damping transmission mechanism according to claim 2, wherein the minimum distance of the at least one pair of buffer members in the axial direction (A) is smaller than that of the abutment portion (21) in the shaft The maximum thickness in the direction (A) is such that the abutting portion (21) can contact with the at least one pair of cushioning members during the process of rotating through the at least one pair of cushioning members.
The damping transmission mechanism according to claim 2 or 3, wherein each of the buffer members includes two ends (42) provided on the axial end plates (11, 12) of the housing (1) And the reeling portion (41) located between the two end portions (42), the reeling portions (41) of the pair of buffer members are opposed to each other in the axial direction (A).
The damping transmission mechanism according to claim 4, characterized in that the two axial end plates (11, 12) of the housing (1) are respectively formed to face in the axial direction (A) The protrusions (11P, 12P) protruding from each other, and both ends (42) of the buffer member are fixed to the protrusions (11P, 12P).
The damping transmission mechanism according to claim 4, characterized in that the two axial end plates (11, 12) of the housing (1) are respectively formed to face in the axial direction (A) The protrusions (11P, 12P) protruding from each other, one of the two ends (42) is fixed to the protrusion (11P, 12P), and the other of the two ends (42) One end is a free end.
The damping transmission mechanism according to claim 6, characterized in that the two ends (42) of the cushioning member straddle the top of the protrusion (11P, 12P) and are bent toward the bottom of the protrusion .
The damping transmission mechanism according to any one of claims 4 to 7, wherein the damping spring (3) is an arc-shaped coil spring, and the arc-shaped coil spring is along the circumferential direction (C ) Extends and is installed between two adjacent protrusions (11P, 12P) in the circumferential direction (C).
The damping transmission mechanism according to any one of claims 2 to 8, characterized in that the circumferential sides of the abutting portion (21) are chamfered.
A power transmission system, comprising a motor, an engine, and the damping transmission mechanism according to any one of claims 1 to 9, wherein the motor is drivingly coupled with the engine via the damping transmission mechanism, so that the motor It can be used to start the engine and be driven by the engine to generate electricity.