Normally closed friction clutch

Abstract

The utility model discloses a normally-closed type friction clutch which aims at overcoming the defects that an existing steering booster is locked, blocked and large in damping during steering operation when a main hydraulic system breaks down and the pressure is unstable. The clutch comprises a shell, an inner fluted disc and a driving claw, a claw body of the driving claw is connected with a plurality of first friction plates which are coaxially arranged and synchronously rotate, a second friction plate is elastically connected between every two adjacent first friction plates, and the second friction plates are configured to move in the axis direction of the driving claw and rotate relative to the first friction plates. The inner fluted disc is configured to be capable of moving in the axis direction of the driving claw so as to push the first friction plate and the second friction plate to abut against each other, and the first friction plate and the second friction plate are always kept in the abutting state without the influence of external force. When hydraulic pressure is insufficient or a hydraulic and pneumatic system breaks down, instant meshing can be achieved, power of the gearbox is transmitted to the auxiliary oil pump, the oil pump works continuously, and stable hydraulic pressure is provided for the power steering pump.

Description

Technical Field

[0001] The utility model relates to the field of transmission, and more specifically, to a normally closed friction clutch. Background Art

[0002] The truck's power steering system relies on oil for power, and the oil pressure is usually provided by the main oil pump. However, when a system component fails, the pressure of the hydraulic system will become unstable or the power will disappear, resulting in reduced power of the power steering system, locking, sticking, and high damping during steering operations, which greatly increases driving risks.

[0003] The present application aims to provide a normally closed friction clutch, which is used to realize the time-sharing connection between the auxiliary oil pump and the gearbox. It engages instantly when the hydraulic pressure is insufficient or the hydraulic or pneumatic system fails, and transmits the gearbox power to the auxiliary oil pump. The oil pump continues to work to provide stable hydraulic pressure for the power steering pump. Summary of the invention

[0004] The utility model overcomes the shortcomings of the existing steering booster, such as locking, sticking and large damping during steering operation under the condition of unstable pressure due to failure of the main hydraulic system, and provides a normally closed friction clutch, which can instantly engage when the hydraulic pressure is insufficient or the hydraulic and pneumatic systems fail, and transmit the gearbox power to the auxiliary oil pump. The oil pump continues to work to provide stable hydraulic pressure for the steering booster pump.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A normally closed friction clutch comprises a housing, an inner gear plate and a driving claw, wherein the claw body of the driving claw is connected to a plurality of first friction plates which are coaxially arranged and rotate synchronously, and second friction plates are elastically connected between adjacent first friction plates, and the second friction plates are configured to be able to move along the axial direction of the driving claw and rotate relative to the first friction plates, and the inner gear plate is configured to be able to move along the axial direction of the driving claw to push the first friction plates and the second friction plates to abut against each other, and the first friction plates and the second friction plates always maintain an abutting state when there is no external force.

[0007] The friction clutch in the present application generates friction force by abutting with the first friction plate and the second friction plate that rotate synchronously with the driving claw to brake. The driving claw is connected to the power shaft, and the power shaft outputs power. The driving shaft rotates synchronously with the power shaft, and the first friction plate is set to rotate synchronously with the driving claw, so the first friction plate and the second friction plate rotate relative to each other, and the kinetic energy of the power claw is consumed by the friction between the two to convert into heat energy between the first friction plate and the second friction plate, providing a braking function. The clutch work of the present application is realized in that the second friction plate can move on the axis of the driving claw (hereinafter referred to as the axis), so as to break away from the abutment with the first friction plate and no longer provide braking for the driving claw. The clutch of the present application is a normally closed type, so the first friction plate and the second friction plate always maintain abutment without external force, and there is friction between the two. In other words, the inner toothed disc will generate thrust on the first friction plate and the second friction plate without external force, overcoming the elastic force of the elastic member between the first friction plate and the second friction plate, so that the two are offset. The present application is a normally closed friction clutch, which can engage instantly when the hydraulic pressure is insufficient or the hydraulic or pneumatic system fails, and transmit the transmission power to the auxiliary oil pump. The oil pump continues to work to provide stable hydraulic pressure for the power steering pump.

[0008] Preferably, a spline shaft is also included, the spline shaft is coaxial with the inner gear disc and the drive shaft and is rotatably connected, the inner gear disc and the second friction plate are meshed with the spline shaft. The spline shaft is used to provide a guide for the inner gear disc and the second friction plate, the inner gear disc and the second friction plate are annular, sleeved on the spline shaft and meshed with the splines on the spline shaft, the spline pair has the characteristics of coaxial rotation and being able to slide in the axial direction, and the movement in the axial direction is achieved through the spline shaft, the inner gear disc and the second friction.

[0009] Preferably, a wave spring is provided between the first friction plate and the second friction plate. The elastic member between the first friction plate and the second friction plate is a wave spring, and this structure realizes that when the inner gear disc does not abut against the first friction plate and the second friction plate, under the elastic force of the wave spring, there is a gap between the first friction plate and the second friction plate and they do not abut against each other, so that the clutch force is in an open state, so that the power shaft can rotate freely.

[0010] Preferably, a plurality of spring holes are provided at equal intervals along the circumferential direction at one end of the inner gear plate away from the driving claw, and a compression spring is provided in the spring hole, and the compression spring abuts against the housing or a positioning member rigidly connected to the housing. The structure provides the power for the inner gear plate to abut against the first friction plate and the second friction plate under the action of an external force, and in the absence of an external force, the compression spring pushes the inner gear plate away from the housing and close to the first friction plate, and overcomes the wave spring so that the first friction plate and the second friction plate abut against each other.

[0011] Preferably, a magnetic ring is mounted on the inner gear disc, and a sensor for detecting the magnetic ring is mounted on the housing. The inner gear disc and the magnetic ring rotate synchronously, and in some schemes, the housing is prefabricated with a mounting hole for placing the sensor, and the mounting hole is facing the radial direction of the magnetic ring. Through the magnetic ring and the sensor, the rotation speed of the inner gear disc can be obtained, thereby obtaining the status of the clutch and the power shaft.

[0012] Preferably, the inner toothed disc is connected to a pressure plate in a transmission manner, and a piston ring is also provided in the housing. The piston ring, the pressure plate and the inner wall of the housing form a piston cavity. The housing is provided with an air inlet hole at a position corresponding to the piston cavity. The clutch causes the displacement of the pressure plate and the inner toothed disc through the air pressure change in the piston cavity, thereby releasing the abutment state of the first friction plate and the second friction plate. The structure provides a force to move the inner toothed disc. When the internal pressure of the piston cavity changes, the pressure plate will be pushed to drive the inner toothed disc to move along the axial direction, thereby expanding the volume of the inner plug cavity, thereby reducing the pressure difference between the internal pressure and the external pressure. In this process, the inner toothed disc is driven away from the first friction plate and the second friction plate, thereby releasing the abutment state of the first friction plate and the second friction plate.

[0013] Preferably, an oil seal is provided between the inner wall of the housing and the outer wall of the driving claw, and the oil seal prevents the oil in the gearbox from entering the clutch.

[0014] Preferably, the driving claw comprises a disc body and a shaft body, the claw bodies are arranged on the disc body at equal intervals along the circumference, the first friction plate is provided with a notch corresponding to the claw body, and the first friction plate is installed on the claw body through the notch. The structure is used to achieve synchronous rotation of the driving claw and the first friction.

[0015] Preferably, the housing includes a first housing near the inner gear disc and a second housing near the driving claw, and the first housing and the second housing are fixedly connected by fasteners, and the number of the fasteners is three and they are arranged at equal intervals in the circumferential direction of the housing. Through the above structure, the first housing and the second housing are reliably connected together, and the accumulation of stress can be reduced.

[0016] Preferably, the first shell has a first attachment ear extending radially, the first attachment ear is provided with a connection hole, and the center line of the two connection holes passes through the axis of the driving claw; the second shell has a second attachment ear and a third attachment ear extending radially, the second attachment ear and the third attachment ear are provided with connection holes, and the axes of the connection holes of the second attachment ear and the third attachment ear are perpendicular. The structure can be fully connected to external equipment and can fully absorb the component forces in all directions.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] This application can instantly engage when there is insufficient hydraulic pressure or a hydraulic or pneumatic system failure, and transmit the transmission power to the auxiliary oil pump. The oil pump continues to work to provide stable hydraulic pressure for the power steering pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the first stereogram of the utility model;

[0020] Figure 2 It is a second stereogram of the utility model;

[0021] Figure 3 It is a side view of the utility model;

[0022] Figure 4 yes Figure 3 Sectional view at AA in the middle;

[0023] Figure 5 yes Figure 4 Schematic diagram in the open state;

[0024] Figure 6 is a schematic diagram of a driving claw and a first friction plate;

[0025] In the figure:

[0026] Housing 1, inner gear disc 2, driving claw 3, first friction plate 4, second friction plate 5, spline shaft 6, wave spring 7, compression spring 8, piston ring 9, pressure plate 10, air inlet 11, magnetic ring 12, oil seal 13, disc body 14, shaft body 15, first housing 16, second housing 17, first attachment ear 18, second attachment ear 19, third attachment ear 20, mounting hole 21. DETAILED DESCRIPTION

[0027] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0031] Example:

[0032] Ginseng Figure 3 , 4 As shown, a normally closed friction clutch includes a housing 1, an inner gear plate 2 and a driving claw 3, the claw body of the driving claw 3 is connected to a plurality of coaxially arranged and synchronously rotating first friction plates 4, second friction plates 5 are elastically connected between adjacent first friction plates 4, the second friction plates 5 are configured to be able to move along the axial direction of the driving claw 3 and to rotate relative to the first friction plates 4, the inner gear plate 2 is configured to be able to move along the axial direction of the driving claw 3 to push the first friction plates 4 and the second friction plates 5 to abut against each other, and the first friction plates 4 and the second friction plates 5 always maintain an abutting state when there is no external force.

[0033] The movement of the first friction plate 4 and the inner gear disc 2 on the axis is achieved in some embodiments as follows:

[0034] The housing 1 has a spline shaft 6, which is coaxial with the inner gear disc 2 and the drive shaft and is rotatably connected. The inner gear disc 2 and the second friction plate 5 are meshed with the spline shaft 6. The spline shaft 6 is used to provide a guide for the inner gear disc 2 and the second friction plate 5. The inner gear disc 2 and the second friction plate 5 are annular, mounted on the spline shaft 6 and meshed with the splines on the spline shaft 6. The spline pair has the characteristics of coaxial rotation and sliding in the axial direction. Through the spline shaft 6, the inner gear disc 2 and the second friction realize movement in the axial direction. The specific way of rotational connection is to have a bearing between the spline shaft 6 and the drive claw 3, and the bearing is a deep groove ball bearing.

[0035] There are also bearings between the spline shaft 6 and the housing 1 , and between the driving claw 3 and the housing 1 , so as to realize relative rotation between the spline shaft 6 , the driving claw 3 and the housing 1 .

[0036] In some embodiments, the coaxial synchronous rotation of the driving claw 3 and the first friction plate 4 is achieved as follows:

[0037] The driving claw 3 includes a disc body 14 and an axial body 15. The claw bodies are arranged on the disc body 14 at equal intervals along the circumference. The first friction plate 4 is provided with a notch corresponding to the claw body. The first friction plate 4 is installed on the claw body through the notch. The structure is used to realize the synchronous rotation of the driving claw 3 and the first friction. Through the above structure, the first friction plate 4 meets the limited movement in the axial direction.

[0038] A wave spring 7 is provided between the first friction plate 4 and the second friction plate 5. The elastic member between the first friction plate 4 and the second friction plate 5 is a wave spring 7. This structure realizes that when the inner gear disc 2 does not abut the first friction plate 4 and the second friction plate 5, under the elastic force of the wave spring 7, there is a gap between the first friction plate 4 and the second friction plate 5 and they do not abut each other, so that the clutch force is in an open state, so that the power shaft can rotate freely. When the inner gear disc 2 is not applying force, there is a gap between the first friction plate 4 and the second friction plate 5 and they do not abut each other. Specifically, the first friction plate 4 has an opening for installing the wave spring 7.

[0039] Ginseng Figure 6 As shown, one end of the inner gear disc 2 away from the driving claw 3 is provided with a plurality of spring holes at equal intervals along the circumferential direction, and a compression spring 8 is provided in the spring hole, and the compression spring 8 abuts against the housing 1 or a positioning member rigidly connected to the housing 1. The structure provides the power for the inner gear disc 2 to abut against the first friction plate 4 and the second friction plate 5 under the action of an external force. In the absence of an external force, the compression spring 8 pushes the inner gear disc 2 away from the housing 1 and close to the first friction plate 4, and overcomes the wave spring 7 so that the first friction plate 4 and the second friction plate 5 abut against each other. The normally closed function is achieved by the structure.

[0040] In some embodiments, a magnetic ring 12 is mounted on the inner gear disc 2, and a sensor for detecting the magnetic ring 12 is mounted on the housing 1. The inner gear disc 2 and the magnetic ring 12 rotate synchronously, and in some embodiments, the housing 1 is prefabricated with a mounting hole 21 for placing the sensor, and the mounting hole 21 faces the radial direction of the magnetic ring 12. Through the magnetic ring 12 and the sensor, the rotation speed of the inner gear disc 2 can be obtained, thereby obtaining the state of the clutch and the power shaft.

[0041] In some embodiments, an oil seal 13 is provided between the inner wall of the housing 1 and the outer wall of the driving claw 3. The oil seal 13 prevents the oil in the gearbox from entering the clutch.

[0042] Ginseng Figure 1 , 2 As shown, the housing 1 includes a first housing 16 close to the inner gear plate 2 and a second housing 17 close to the driving claw 3. The first housing 16 and the second housing 17 are fixedly connected by fasteners. The number of the fasteners is three and they are arranged at equal intervals in the circumferential direction of the housing 1. Through the above structure, the first housing 16 and the second housing 17 are reliably connected together, and the accumulation of stress can be reduced.

[0043] The first shell 16 has a first attachment ear 18 extending radially, and a connection hole is provided on the first attachment ear 18, and the center line of the two connection holes passes through the axis of the driving claw 3; the second shell 17 has a second attachment ear 19 and a third attachment ear 20 extending radially, and the second attachment ear 19 and the third attachment ear 20 have connection holes, and the axes of the connection holes of the second attachment ear 19 and the third attachment ear 20 are perpendicular. The structure can be fully connected to external equipment and can fully absorb the component forces in all directions.

[0044] Controlling the position of the inner gear plate 2 to adjust the clutch is as follows:

[0045] The inner gear disc 2 is connected to the pressure plate 10 in a transmission manner, and the housing 1 is also provided with a piston ring 9. The piston ring 9, the pressure plate 10 and the inner wall of the housing 1 form a piston cavity. The housing 1 is provided with an air inlet 11 at a position corresponding to the piston cavity. The clutch causes the pressure plate 10 and the inner gear disc 2 to move through the air pressure change in the piston cavity, thereby releasing the abutment state of the first friction plate 4 and the second friction plate 5. The structure provides a force to move the inner gear disc 2. When the internal pressure of the piston cavity changes, the pressure plate 10 will be pushed to drive the inner gear disc 2 to move along the axial direction, thereby expanding the volume of the inner plug cavity, thereby reducing the pressure difference between the internal pressure and the external pressure. In this process, the inner gear disc 2 is driven away from the first friction plate 4 and the second friction plate 5, thereby releasing the abutment state of the first friction plate 4 and the second friction plate 5.

[0046] In some embodiments, oil or other pressure media enters the piston chamber. A bearing is provided between the pressure plate 10 and the inner gear disc 2 .

[0047] The friction clutch in the present application generates friction force by abutting with the first friction plate 4 and the second friction plate 5 which rotate synchronously with the driving claw 3 to brake. The driving claw 3 is connected to the power shaft, and the power shaft outputs power. The driving shaft rotates synchronously with the power shaft, and the first friction plate 4 is set to rotate synchronously with the driving claw 3, so the first friction plate 4 and the second friction plate 5 rotate relative to each other, and the kinetic energy of the power claw is consumed by the friction between the two to convert it into heat energy between the first friction plate 4 and the second friction plate 5, providing a braking function. The clutch work of the present application is realized in that the second friction plate 5 can move on the axis of the driving claw 3 (hereinafter referred to as the axis), so as to break away from the abutment with the first friction plate 4 and no longer provide braking for the driving claw 3. The clutch of the present application is a normally closed type, so the first friction plate 4 and the second friction plate 5 always maintain abutment without external force, and there is friction between the two. In other words, the inner toothed disc 2 will generate thrust on the first friction plate 4 and the second friction plate 5 without external force, overcoming the elastic force of the elastic member between the first friction plate 4 and the second friction plate 5, so that the two are offset. The present application is a normally closed friction clutch, which can engage instantly when the hydraulic pressure is insufficient or the hydraulic or pneumatic system fails, and transmit the transmission power to the auxiliary oil pump. The oil pump continues to work to provide stable hydraulic pressure for the power steering pump.

[0048] The clutch engagement principle:

[0049] Ginseng Figure 4 As shown, under the action of the compression spring 8, the inner toothed disc 2 is subjected to the elastic force and moves toward the driving claw 3 along the axial direction, abutting the first friction plate 4, overcoming the elastic force of the wave spring 7 between the first friction plate 4 and the second friction plate 5, so that the second friction plate 5 moves in the axial direction, thereby making the first friction plate 4 and the second friction plate 5 abut against each other, and the pressure between the two is converted into friction force in the circumferential direction, and the friction force provides braking force for the driving claw 3. In this process, since the inner toothed disc 2 is pressed onto the first friction plate 4 and is also driven by the friction force, the inner toothed disc 2 and the driving claw 3 rotate synchronously, and the rotation speed of the above-mentioned synchronously rotating structure can be monitored by the magnetic ring 12 and the sensor.

[0050] Clutch opening principle:

[0051] Ginseng Figure 5 As shown, when the pressure medium is injected into the piston chamber, the volume of the piston chamber increases, overcoming the elastic force of the compression spring 8, so that the inner gear disc 2 moves in the direction away from the driving claw 3 and no longer presses on the first friction plate 4. The wave spring 7 between the first friction plate 4 and the second friction plate 5 pushes the first friction plate 4 and the friction plate apart so that there is a gap and they do not interfere with each other, thereby eliminating the friction plate and the corresponding braking force. At this time, the driving claw 3 and the power shaft fixedly connected to it are in a free state and are no longer affected by the clutch. Since the inner gear disc 2 is separated from the driving claw 3 at this time, the magnetic ring 12 and the inner gear disc 2 remain stationary and there is no rotation speed.

[0052] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A normally closed friction clutch, characterized in that: It includes a shell, an inner gear disk and a driving claw, the claw body of the driving claw is connected to a plurality of first friction plates which are coaxially arranged and rotate synchronously, second friction plates are elastically connected between adjacent first friction plates, the second friction plates are configured to be able to move along the axial direction of the driving claw and rotate relative to the first friction plates, the inner gear disk is configured to be able to move along the axial direction of the driving claw to push the first friction plates and the second friction plates to abut against each other, and the first friction plates and the second friction plates always maintain an abutting state when there is no external force.

2. A normally closed friction clutch according to claim 1, characterized in that: It also includes a spline shaft, which is coaxial with the inner gear plate and the drive shaft and rotatably connected, and the inner gear plate and the second friction plate are meshed with the spline shaft.

3. A normally closed friction clutch according to claim 1, characterized in that: A wave spring is arranged between the first friction plate and the second friction plate.

4. A normally closed friction clutch according to claim 1, characterized in that: A plurality of spring holes are arranged at equal intervals along the circumferential direction on one end of the inner gear disc away from the driving claw, and a compression spring is arranged in the spring hole. The compression spring abuts against the housing or a positioning member rigidly connected to the housing.

5. A normally closed friction clutch according to claim 4, characterized in that the inner The gear disc is connected to the pressure plate through transmission, and a piston ring is also provided in the shell. The piston ring, the pressure plate and the inner wall of the shell form a piston cavity. The shell is provided with an air inlet hole at the position corresponding to the piston cavity. The clutch causes the displacement of the pressure plate and the inner gear disc through the change of air pressure in the piston cavity, thereby releasing the abutment state of the first friction plate and the second friction plate.

6. A normally closed friction clutch according to claim 1, characterized in that: A magnetic ring is mounted on the inner gear disc, and a sensor for detecting the magnetic ring is installed on the shell.

7. A normally closed friction clutch according to claim 1, characterized in that: An oil seal is arranged between the inner wall of the shell and the outer wall of the driving claw.

8. A normally closed friction clutch according to claim 3, characterized in that: The driving claw comprises a disc body and a shaft body, the claw bodies are arranged on the disc body at equal intervals along the circumference, a notch corresponding to the claw body is provided on the first friction plate, and the first friction plate is installed on the claw body through the notch.

9. A normally closed friction clutch according to claim 1, characterized in that: The housing comprises a first housing close to the inner gear disc and a second housing close to the driving claw. The first housing and the second housing are fixedly connected by fasteners. The number of the fasteners is three and they are arranged at equal intervals in the circumferential direction of the housing.

10. A normally closed friction clutch according to claim 9, characterized in that: A first attachment ear is radially extended from the first shell, and a connecting hole is provided on the first attachment ear, and the center line of the two connecting holes passes through the axis of the driving claw; a second attachment ear and a third attachment ear are radially extended from the second shell, and the second attachment ear and the third attachment ear are provided with connecting holes, and the axes of the connecting holes of the second attachment ear and the third attachment ear are perpendicular.

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