CN115405642A

CN115405642A - Torque limiting device for vehicle

Info

Publication number: CN115405642A
Application number: CN202110592448.7A
Authority: CN
Inventors: 范意中
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2022-11-29

Abstract

The present invention relates to a torque limiting device for a vehicle, which is provided between an output shaft of an engine of the vehicle and a power train, the torque limiting device according to the present invention includes: the clutch includes a housing, a friction disc rotating with the torque output shaft, a pressure plate axially adjacent to the friction disc and capable of pressing the friction disc, and an elastic member located on a side of the pressure plate facing away from the housing, the elastic member pressing the pressure plate in the axial direction. According to an embodiment of the invention, the torque limiting device further comprises a plurality of connecting elements for providing a bearing point for the elastic element, wherein the connecting elements have a first end connected to the housing and a second end connected to the elastic element, wherein the second end is connected to the elastic element in a form-fitting manner.

Description

Torque limiting device for vehicle

Technical Field

The present invention relates to a torque limiting device for a vehicle, which is provided between an output shaft of an engine and a power train of the vehicle, for preventing torque transmission exceeding a preset limiting torque from occurring.

Background

When an internal combustion engine of a vehicle is operated, combustion pressure is intermittently generated in a cylinder as a driving force of a piston, which is then transmitted to an output shaft to obtain a driving torque. Therefore, there is a fluctuation in torque generated in the output shaft. In a transmission of a power transmission system, torque vibration is usually adjusted and then transmitted to the power transmission system. A flywheel, which serves as an inertial mass for damping an acceleration change component of the torque vibration, is mounted on the engine output shaft, and a torque damper, which is a displacement damper for damping a speed change component, is mounted in the clutch.

Recently, more and more vehicles use a hybrid drive system. In such a vehicle, since the output shaft of the engine is connected to the motor, the torque vibration thereof can be significantly reduced. Since the rotor shaft of the electric motor has a large inertial mass, when the torques of the engine and the electric motor change abruptly, the torque damper cannot respond to an excessive torque applied between the output shaft of the engine and the rotor shaft. Therefore, a torque limiter needs to be additionally provided to release such excessive torque by relative sliding rotation between the two shafts.

A torque limiting device is known from US 2014094321 A1. Referring to fig. 3 of the patent, the torque limiting device includes: the disk plate 56, an annular plate-shaped backing plate 76 that rotates integrally with the disk plate 56 about the axis C, a disk-shaped first support plate 78a and a disk-shaped pressure plate 80 that are positioned on the outer peripheral side, a conical disc spring 82 that is axially inserted into a gap between the pressure plate 80 and the first support plate 78a, a first friction material 88 that is inserted between the pressure plate 80 and the backing plate 76, and a second friction material 89 that is inserted between the inner peripheral portion of the second support plate 78b and the backing plate 76. The disc spring 82 is inserted in a preloaded state between the first support plate 78a and the pressure plate 80. The belleville spring 82 is formed in a tapered shape, and has an inner peripheral end portion abutting against the pressure plate 80 and an outer peripheral end portion abutting against the first support plate 78a to generate the preload. The disadvantage of this construction is that the overall construction takes up too much space in the axial direction and, due to the semi-closed construction and the fixed connection of the bearing plate, it is not easy to disassemble and replace parts such as disk springs and friction elements. In addition, the production costs of such a support plate are relatively high.

Disclosure of Invention

The object of the present invention is to provide an improved torque limiting device which overcomes the above-mentioned disadvantages of the prior art. According to the present invention, there is provided a torque limiting device for a vehicle, which is provided between an output shaft of an engine of the vehicle and a power train, the torque limiting device according to the present invention comprising: the clutch includes a housing, a friction disc rotating with the torque output shaft, a pressure plate axially adjacent to the friction disc and capable of pressing the friction disc, and an elastic member located on a side of the pressure plate facing away from the housing, the elastic member pressing the pressure plate in the axial direction. According to an embodiment of the invention, the torque limiting device further comprises a plurality of connecting elements for providing a bearing point for the elastic element, wherein the connecting elements have a first end connected to the housing and a second end connected to the elastic element, wherein the second end is connected to the elastic element in a form-fitting manner.

According to the design scheme of the invention, a plurality of independent connecting pieces are used for replacing the bearing plate in the prior art, so that the integral structure of the torque limiting device is simplified, and the axial space and the radial space are particularly saved; the connecting piece is connected with the elastic piece in a shape matching manner, so that the connecting piece is easier to disassemble; in addition, the connecting piece saves materials, is easier to manufacture and reduces the manufacturing cost.

According to a preferred embodiment of the present invention, a first opening is provided on the housing, the second end of the connecting member passes through the first opening to connect with the elastic member, and the first end of the connecting member is engaged with a side of the first opening facing away from the elastic member. The connecting piece has both ends not of uniform size, utilizes less one end to pass the trompil, and great one end is opened on the trompil to connect casing and elastic component. The connecting structure is simple and easy, and the manufacturing cost is greatly reduced. In addition, preferably, a second opening is formed in the corresponding position of the pressure plate, and the second end of the connecting piece penetrates through the second opening to be connected with the elastic piece.

According to a preferred embodiment of the invention, the spring is designed as a conical disk spring, the cone mouth of which presses against the pressure plate in a preloaded state. The disk spring has the advantages of low manufacturing cost and simple structure, and is a preferable scheme as the elastic element. It is also conceivable that the connecting element according to the invention has a connecting section for connecting the first end and the second end, the length of which connecting section is set according to the magnitude of the preload, so that an adjustment of the preload of the spring element can be achieved by means of the structural features of the connecting element. In addition, preferably, a protruding part is arranged on the circumferential edge of the disc spring, a clamping groove is arranged in the protruding part, and the second end of the disc spring is clamped in the clamping groove. In addition, preferably, set up the bulge on belleville spring's circumference edge be equipped with the third trompil on the bulge, the first end of connecting piece is passed the third trompil and is connected with the casing, and the second end joint of connecting piece deviates from in the third trompil on one side of casing. Other connection forms can also be designed, so that a form-fitting connection which is simple and easy to manufacture is realized.

According to a preferred embodiment of the present invention, the connecting member is manufactured by one-shot forming through a stamping process. The connecting piece has a simple structure, and is suitable for being manufactured by a stamping process, so that the manufacturing cost is greatly reduced.

According to a preferred embodiment of the present invention, the torque limiting device further has a plate spring for transmitting torque between the housing and the pressure plate, thereby achieving smoother torque transmission between the pressure plate and the housing. Preferably, the leaf spring is provided between the two connecting members in the circumferential direction, facilitating the overall arrangement of the torque limiting device.

Drawings

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The attached drawings are as follows:

FIG. 1 shows a side view of a torque limiting device according to the present invention;

FIG. 2 illustrates a perspective view of a torque limiting device according to the present invention;

fig. 3 shows a partially enlarged view of the torque limiting device according to the invention.

In the drawings like parts are provided with the same reference numerals.

Detailed Description

Fig. 1 shows a torque limiting device 1 according to the invention for preventing the occurrence of torque transmission exceeding a preset limiting torque. As shown, the torque limiting device includes: a housing 2, a disc spring 4, a pressure plate 5 and a friction disc 6. The friction disc 6 rotates with the torque transmission shaft 7, the pressure plate 5 is adjacent to the friction disc 6 in the axial direction, the disc spring 4 is adjacent to the pressure plate 5 in the axial direction, and the disc spring 4 can transmit axial force to the pressure plate 5, so that the pressure plate 5 and the friction disc 6 are pressed to transmit torque. The torque limiting device also has a connecting element 3 which connects the housing 2 and the disk spring 4. The connecting element 3 is connected to the disk spring 4 via an opening 8 provided in the housing 2 and, if necessary, also via an opening provided in the pressure plate 5.

Fig. 2 is a perspective view of the torque limiting device 1 according to the present invention. As shown, a plurality of connecting members 3 are evenly distributed over the circumference of the torque limiting device 1.

Fig. 3 is an enlarged view of a portion circled by a dotted line in fig. 2, clearly showing the structure of the connecting member 3 and the manner of connection. As shown, the connector 3 includes a first end 31, a second end 32, and a connecting segment 33 connecting the first end 31 and the second end 32. A projection 41 is provided on the edge of the disk spring 4, and a catch is provided on this projection 41. The shell 2 is provided with an opening 8, the second end 32 of the connecting piece 3 is clamped in the clamping groove of the protruding part 41, and the first end 31 of the connecting piece 3 penetrates through the opening 8 and is clamped on one side of the shell 2, which is far away from the disc spring 4. The second end 32 of the connecting element 3 serves as a support point for the disk spring, which presses with prestress against the pressure plate 5. The length of the connecting section 32 of the connecting member 3 may be set according to the magnitude of the target prestress.

Preferably, for the connecting member 3, when the first end 31 is installed in cooperation with the housing 2 through the opening 8, the width of the first end 31 is greater than the corresponding width of the opening 8, so that the first end 31 can be limited by the opening 8 in the axial direction, and can be used as a support for the pre-tightening force of the disc spring 4. And the catching groove of the protrusion 41 preferably has an opening at a radially outer side thereof into which a narrower portion of the second end 32 can be inserted, and a wider portion of the second end 32 has a width larger than that of the catching groove so that the wider portion of the second end 32 can bear the elastic force of the protrusion 41 of the disc spring 4. And as to the shape of the first end 31 and the second end 32, it may be a plate, sphere, square, or other polyhedral structure.

The connecting piece 3 can be a single piece or a split piece and is connected by a mechanical connection. For the split-type connecting piece 3, the part including the first end 31 and the part including the second end 32 can be connected together by means of screw connection, mortise and tenon connection, snap connection and the like.

Further, the width of the second end 32 may be set smaller than the width of the opening 8, and the width of the opening 8 is smaller than the width of the first end 31, so that when the connecting member 3 is installed, the second end 32 can first pass through the opening 8 and further engage with the protrusion 41 of the disc spring 4, and the first end 31 cannot pass through the opening 8.

Alternatively, it is also possible to have the first end 31 pass through the opening of the disc spring 4 and be connected to the housing 2, while the second end 32 is limited by the opening of the disc spring 4.

A plate spring 9 is arranged between the shell 2 and the pressure plate 5, and two sections of the plate spring 9 are respectively fixed on the shell 2 and the pressure plate 5, so that smoother torque transmission between the pressure plate 5 and the shell 2 is realized. Furthermore, in the circumferential direction, a leaf spring 9 is preferably provided between the two connecting pieces 3, facilitating the overall arrangement of the torque limiting device.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, a skilled person is provided with more technical guidance for converting at least one exemplary embodiment, wherein various modifications, for example using other forms of form-fitting connection, may be made without departing from the scope of protection of the claims.

List of reference numerals

1. Torque limiting device

2. Slip clutch housing

3. Connecting piece

31. First end

32. Second end

33. Connecting segment

4. Disc spring

41. Projecting part

5. Pressing plate

6. Friction disk

7. Torque transmission shaft

8. Opening holes

9. A leaf spring.

Claims

1. A torque limiting device for a vehicle, the torque limiting device comprising:

-a housing;

-a friction disc;

-a pressure plate axially adjacent to the friction disc, the pressure plate being capable of pressing the friction disc to transmit torque,

-a spring element which is located on a side of the pressure plate facing away from the housing and which presses the pressure plate in an axial direction,

it is characterized in that the preparation method is characterized in that,

the torque limiting device further comprises a plurality of connecting elements for providing a bearing point for the spring element, wherein the connecting elements have a first end connected to the housing and a second end connected to the spring element, wherein the second end is positively connected to the spring element.

2. The torque limiting device of claim 1, wherein a first opening is formed in the housing, at least a portion of the connecting member passes through the first opening to connect with the elastic member, and a first end of the connecting member is engaged with a side of the first opening facing away from the elastic member.

3. The torque limiting device of claim 2 wherein a second opening is provided in said pressure plate, at least a portion of the connecting member passing through said second opening to connect with said resilient member.

4. The torque limiting device according to claim 1, wherein the elastic member is designed as a conical disk spring which presses against the pressure plate in a preloaded state.

5. The torque limiting device of claim 4 wherein said connection member has a connecting segment for connecting said first end and said second end, said connecting segment having a length that is set according to the magnitude of said preload.

6. The torque limiting device of claim 4, wherein a protrusion is provided on a circumferential edge of the disc spring, a detent is provided on the protrusion, and the second end is snapped into the detent.

7. The torque limiting device of claim 4, wherein a protrusion is provided on a circumferential edge of the disc spring, a third opening is provided on the protrusion, at least a portion of a connecting member passes through the third opening to connect with the housing, and a second end of the connecting member is snapped on a side of the third opening facing away from the housing.

8. The torque limiting device of claim 1 wherein said connecting member is manufactured in one piece by a stamping process.

9. The torque limiting device of claim 1 further comprising a leaf spring for transmitting torque between said housing and said pressure plate.

10. The torque limiting device of claim 9 wherein the leaf spring is disposed between two connecting members in a circumferential direction.