Worm mechanism shock absorber, steering system with worm mechanism shock absorber and automobile

Abstract

The utility model discloses a worm mechanism shock absorber which is used for a worm transmission mechanism in an automobile. Comprising a shell used for being fixedly connected to a worm transmission mechanism, an ejector rod arranged in the shell, a first damping piece arranged in the shell and connected with the ejector rod, a second damping piece arranged between the shell and the first damping piece, and a magnetic adsorption piece arranged between the shell and the second damping piece. When the worm transmission mechanism generates forced vibration, the ejector rod is used for transmitting an impact load of the forced vibration to the first damping piece and the second damping piece, the first damping piece generates damping vibration under the action of the impact load to offset part of the impact load, and the second damping piece generates electromagnetic damping under the action of the impact load to offset part of the impact load. The electromagnetic damping and the magnetic field of the adsorption member form a magnetic damping effect to offset the other part of the impact load. The utility model further discloses a steering system with the worm mechanism shock absorber and an automobile with the worm mechanism shock absorber.

Description

Technical Field

[0001] The utility model belongs to the technical field of steering gears, in particular to a worm gear mechanism shock absorber and a steering system and a car with the worm gear mechanism shock absorber. Background Art

[0002] Worm gear transmission mechanisms are widely used in automobile steering systems due to their compact structure, large transmission ratio and smooth transmission. However, due to the impact load of the road surface or the high relative sliding speed between the components in the worm gear transmission mechanism, it is common that the meshing clearance between the components becomes larger due to wear, resulting in transmission failure. At present, in order to increase the service life of the worm gear transmission mechanism, manufacturers usually ensure the meshing clearance between the components in the worm gear transmission mechanism by setting bushings, adjustment bolts or preload springs. However, the action time and clearance compensation amount of these technical solutions are limited, and they also involve regular manual intervention, and cannot reduce the vibration of the worm gear transmission mechanism during operation to reduce wear. Therefore, those skilled in the art are committed to developing a worm gear mechanism shock absorber to reduce the vibration of the worm gear transmission mechanism in the steering system and improve the NVH (noise, vibration and harshness) performance of the automobile. Utility Model Content

[0003] One object of the utility model is to provide a worm gear mechanism shock absorber, which can overcome the shortcomings of the prior art such as limited compensation effect of meshing clearance, cumbersome control and lack of compactness; another object of the utility model is to provide a steering system and a car with the worm gear mechanism shock absorber.

[0004] In order to achieve the above technical objectives, the first aspect of the utility model provides a worm gear mechanism shock absorber, which is used for a worm gear transmission mechanism in an automobile, comprising a shell for fixedly connected to the worm gear transmission mechanism, a push rod installed in the shell, a first damping member installed in the shell and connected to the push rod, a second damping member arranged between the shell and the first damping member, and a magnetic adsorption member arranged between the shell and the second damping member; when the worm gear transmission mechanism generates forced vibration, the push rod is used to transfer the impact load of the forced vibration to the first damping member and the second damping member, the first damping member generates damped vibration under the action of the impact load to offset a part of the impact load, and the second damping member generates electromagnetic damping under the action of the impact load, and the electromagnetic damping and the magnetic field of the adsorption member form a magnetic damping effect to offset another part of the impact load.

[0005] Preferably, the first damping member includes a piezoelectric body, a coil mounted on the piezoelectric body, and a wire for connecting the piezoelectric body and the coil.

[0006] Preferably, one end of the piezoelectric body is connected to the second damping element, and the other end is connected to the push rod.

[0007] Preferably, the second damping member is elastic and pre-pressed in the housing.

[0008] Preferably, the second damping member is spiral-shaped.

[0009] Preferably, one end of the push rod is provided with a groove for abutting against the worm gear transmission mechanism.

[0010] Preferably, there are multiple adsorption members, and the multiple adsorption members are attached to the inner wall of the shell in a ring shape.

[0011] Preferably, it also includes a vibration isolator arranged between the worm gear transmission mechanism and the push rod.

[0012] The second aspect of the utility model provides a steering system, including a control mechanism, a driving mechanism, a worm gear transmission mechanism, a steering actuator and a worm gear mechanism shock absorber as described in the above technical solution of a car. When the driver rotates the control mechanism, the driving mechanism will drive the worm gear transmission mechanism to rotate and transmit the steering torque to the steering actuator through the worm gear transmission mechanism to achieve steering. The first damping member and the second damping member of the worm gear mechanism shock absorber are used to reduce the vibration of the worm gear transmission mechanism during steering to ensure smooth steering.

[0013] A third aspect of the utility model provides a car, comprising the steering system described in the above technical solution.

[0014] In summary, the utility model has the following beneficial effects:

[0015] The utility model discloses a worm mechanism shock absorber, which is used for a worm transmission mechanism in an automobile, and comprises a housing, a push rod, a first damping member, a second damping member and an adsorption member, wherein the housing is fixedly connected to the worm transmission mechanism, the push rod, the first damping member, the second damping member and the adsorption member are all installed in the housing, and the push rod is in contact with the worm transmission mechanism. When the worm transmission mechanism generates forced vibration, the push rod transmits the impact load of the forced vibration to the first damping member and the second damping member, the first damping member generates damped vibration under the impact load to offset a part of the impact load, and the second damping member generates electromagnetic damping under the impact load, and the electromagnetic damping forms a magnetic damping effect with the magnetic field of the adsorption member to offset another part of the impact load, so as to reduce the vibration amplitude of the worm transmission mechanism and restore it to a stable state in a short time, thereby slowing down the wear of the worm transmission mechanism and improving its service life. Compared with the existing technical solutions, the utility model not only has a better adjustment effect and high efficiency on the worm gear transmission mechanism, can realize closed-loop control without involving regular manual intervention, but also can adapt to the steering systems of cars with different drive modes, which is beneficial to the promotion, implementation and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the assembly structure of a worm gear mechanism shock absorber provided in an embodiment of the utility model;

[0018] Figure 2 for Figure 1 The exploded structural diagram of the worm gear mechanism shock absorber is shown;

[0019] Figure 3 for Figure 1 The schematic diagram of the structure after the shock absorber of the worm gear mechanism and the bearing on the worm gear mechanism are assembled;

[0020] Figure 4 for Figure 1 The cross-sectional structure diagram of the worm gear mechanism shock absorber after being assembled with the bearing on the worm gear mechanism is shown.

[0021] Description of reference numerals:

[0022] 1. Shell; 2. Push rod; 3. Vibration isolator; 4. First damping member; 5. Second damping member; 6. Adsorption member;

[0023] 41. piezoelectric body; 42. coil; 43. wire;

[0024] 7. Bearings;

[0025] 71. Bearing outer ring. DETAILED DESCRIPTION

[0026] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0029] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0030] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0031] During the driving process of the car, the driver manipulates the steering wheel, through a set of transmission mechanisms, to deflect the steering wheel on the road surface at a certain angle to change its driving direction, ensuring the normal and stable driving of the car. The complete set of mechanisms that can deflect the steering wheel to achieve the steering of the car and change or maintain the driving or reverse direction of the car is the car steering system. The car steering system can allow the car to change the driving direction according to the driver's wishes, and also allow the driver to use this mechanism to deflect the steering wheel in the opposite direction when the car's steering wheel is automatically deflected by the interference of the road surface and changes the driving direction, so as to restore the car to its original driving direction.

[0032] See also Figure 1 , Figure 2 As shown, a worm gear mechanism shock absorber provided by an embodiment of the utility model is used for a worm gear transmission mechanism in an automobile, and includes a housing 1, a push rod 2, a first damping member 4, a second damping member 5 and an adsorption member 6, wherein the housing 1 is fixedly connected to the worm gear transmission mechanism, the push rod 2 is arranged in the housing 1, the first damping member 4 is arranged in the housing 1 and connected to one end of the push rod 2, the second damping member 5 is arranged between the housing 1 and the first damping member 4, and the adsorption member 6 is arranged between the housing 1 and the second damping member 5 and has magnetism. It should be noted that the worm gear transmission mechanism mentioned here refers to a transmission mechanism that completes the conversion from rotational motion to linear motion in the steering system of an automobile, and has the function of decelerating and increasing torque. It can be a worm gear transmission mechanism with a worm as an active member and a worm wheel as a driven member, or a worm crankpin type transmission mechanism with a worm as an active member and a crankpin as a driven member, or other transmission mechanisms with a worm as an active member.

[0033] Due to different road conditions, the impact loads to which the worm gear mechanism is subjected during operation are also different. In order to reduce the vibration of the worm gear mechanism, in this embodiment, when the worm gear mechanism generates forced vibration, the top rod 2 transmits the impact load of the forced vibration to the first damping member 4 and the second damping member 5. The first damping member 4 generates damped vibration under the impact load to offset a part of the impact load, and the second damping member 5 generates electromagnetic damping under the impact load. The electromagnetic damping forms a magnetic damping effect with the magnetic field of the adsorption member 6 to offset another part of the impact load. In this way, due to the provision of the first damping member 4 and the second damping member 5, the utility model can significantly reduce the vibration amplitude of the worm gear mechanism and restore it to a stable state in a short time compared to the existing technical solutions, thereby reducing the wear between the components in the worm gear mechanism and improving the service life.

[0034] See also Figure 2As shown, the first damping member 4 is a columnar structure. In order to form electromagnetic damping and produce a magnetic damping effect, the first damping member 4 includes a piezoelectric body 41, a coil 42 and a wire 43, wherein the coil 43 is bolted onto the piezoelectric body 41, and the wire 43 is arranged between the piezoelectric body 41 and the coil 42. It should be noted that the piezoelectric body 41 is a piezoelectric material structure, and preferably, the manufacturing material of the piezoelectric body 41 is quartz crystal or piezoelectric ceramics.

[0035] Furthermore, an adsorption member 6 is also provided on the inner wall of the shell 1. The adsorption member 6 is arc-shaped and is a component that can utilize the magnetic field force to achieve good connection with the shell 1. It can be a magnet, or a combination of a magnet and a magnetic conductive plate, etc., one side of which is an N pole and the other side is an S pole. The magnetic conductive plate can be a plate material that can generate magnetic field force with a magnet, such as an iron plate, a steel plate, an alloy plate, etc. The magnet mentioned here can be an electromagnet or a permanent magnet, but preferably a permanent magnet. There are many types of permanent magnets, and preferably neodymium iron boron permanent magnets are used. In some embodiments, the number of adsorption members 6 is multiple. In this embodiment, in order to ensure that the magnetic field is distributed more evenly in the shell 1, the number of adsorption members 6 is three, and the three damping members 6 are annular and evenly spaced on the inner wall of the shell 1.

[0036] In this way, when the piezoelectric body 41 is subjected to the stamping load, it has kinetic energy and there will be a potential difference between the two end faces and potential energy. Since the loop formed by the piezoelectric body 41, the coil 42 and the wire 43 is in a closed state, at this time, a current will pass through the wire 43 and flow through the coil 42. According to the law of electromagnetic induction, magnetic field energy will be induced on the coil 42, and the polarity of the magnetic field energy can be determined by the right-hand screw rule. Since the first damping member 4 has kinetic energy to move in the magnetic field of the adsorbing member 6, in this embodiment, the polarity of the adsorbing member 6 is arranged according to the principle of mutual repulsion that the polarity of the magnetic field energy induced on the coil 42 is the same, not only can the kinetic energy converted by the first damping member 4 when subjected to the impact load be dissipated in the form of heat energy, but the impact load can also be further dissipated through the thermal effect of the resistance of the coil 42 and the wire 43 itself, thereby reducing the impact of the impact load on the worm gear mechanism.

[0037] See also Figure 2 As shown, in order to further absorb the impact load that causes the worm gear mechanism to vibrate under force, a second damping member 5 is also embedded and fixed at one end of the piezoelectric body 41. The second damping member 5 is elastic and pre-stressed in the housing 1. Preferably, the second damping member 5 is spiral.

[0038] When the second damping member 5 is subjected to the impact load, the second damping member 5 will have the kinetic energy of vibration and the elastic potential energy accumulated due to deformation, and will perform damped vibration until a stable state is reached to further dissipate the impact load, thereby ultimately reducing the impact of the impact load on the worm gear transmission mechanism.

[0039] In this embodiment, the housing 1 is cylindrical, with an open bottom, and a receiving space for installing the top rod 2, the first damping member 4, the second damping member 5 and the adsorbing member 6 is formed inside, and the top can be hexagonal, cross or straight, for easy installation and removal. It should be noted that in this embodiment, the housing 1 is fixedly installed at a preset installation position on the outer shell of the worm gear transmission mechanism, and can be fixed by threaded connection or anti-loosening glue.

[0040] See also Figure 2 As shown, the push rod 2 is in the shape of a straight rod, one end of which is inserted into the housing 1, and the other end is used to abut against the worm gear mechanism. In order to increase the contact area between the push rod 2 and the worm gear mechanism to ensure a smooth impact load transmission path, a groove is provided at one end of the push rod 2, and the shape of the groove is adapted to the shape of the outer surface to be fitted on the worm gear mechanism. It should be noted that since the two ends of the worm in the worm gear mechanism are usually supported by bearings 7, in this embodiment, the push rod 2 abuts against the bearing outer ring 71 of the bearing 7 supporting the worm, please refer to Figure 3 and Figure 4 shown.

[0041] Furthermore, for the sake of vibration isolation and improving the NVH performance of the automobile, the worm gear mechanism shock absorber provided in this embodiment further includes a vibration isolator 3, which is annular and matches the outer contour of the bearing outer ring 71. Preferably, the vibration isolator 3 is made of rubber.

[0042] In order to ensure the stability of the impact load transmission direction, the housing 1 , the push rod 2 , the first damping member 4 , the second damping member 5 and the damping member 6 are coaxially arranged and perpendicular to the central axis of the bearing 7 .

[0043] An embodiment of the utility model further discloses a steering system, comprising an operating mechanism, a driving mechanism, a worm gear transmission mechanism, a steering actuator and a worm gear mechanism shock absorber as described in the above embodiment. When the driver turns the operating mechanism, the driving mechanism will drive the worm gear transmission mechanism to rotate and transmit the steering torque to the steering actuator through the worm gear transmission mechanism to achieve steering. The first damping member 4 and the second damping member 5 of the worm gear mechanism shock absorber are used to reduce the vibration of the worm gear transmission mechanism during the steering process to ensure smooth steering, so that the above steering system has the characteristics of better steering control performance and longer service life.

[0044] The embodiment of the utility model further discloses a car, which includes the steering system as described in the above embodiment, so that the above car has the characteristic of better NVH performance, and the car can include a fuel car and an electric car.

[0045] Compared with the prior art, the utility model has the following beneficial effects:

[0046] The utility model discloses a worm mechanism shock absorber, which is used for a worm transmission mechanism in an automobile, and comprises a housing 1, a push rod 2, a first damping member 4, a second damping member 5 and an adsorption member 6, wherein the housing 1 is fixedly connected to the worm transmission mechanism, the push rod 2, the first damping member 4, the second damping member 5 and the adsorption member 6 are all installed in the housing 1, and the push rod 2 is in contact with the worm transmission mechanism. When the worm transmission mechanism generates forced vibration, the push rod 2 transmits the impact load of the forced vibration to the first damping member 4 and the second damping member 5, the first damping member 4 generates damped vibration under the impact load to offset a part of the impact load, and the second damping member 5 generates electromagnetic damping under the impact load, and the electromagnetic damping forms a magnetic damping effect with the magnetic field of the adsorption member 6 to offset another part of the impact load, so as to reduce the vibration amplitude of the worm transmission mechanism and restore it to a stable state in a short time, thereby slowing down the wear of the worm transmission mechanism and improving its service life. Compared with the existing technical solutions, the utility model not only has a better adjustment effect and high efficiency on the worm gear transmission mechanism, can realize closed-loop control without involving regular manual intervention, but also can adapt to the steering systems of cars with different drive modes, which is beneficial to the promotion, implementation and application.

[0047] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A worm gear mechanism shock absorber, used for a worm gear mechanism in an automobile, characterized in that: The invention comprises a housing (1) for being fixedly connected to a worm gear transmission mechanism, a push rod (2) installed in the housing (1), a first damping member (4) installed in the housing (1) and connected to the push rod (2), a second damping member (5) arranged between the housing (1) and the first damping member (4), and a magnetic adsorption member (6) arranged between the housing (1) and the second damping member (5); when the worm gear transmission mechanism generates forced vibration, the push rod (2) is used to transmit the impact load of the forced vibration to the first damping member (4) and the second damping member (5); the first damping member (4) generates damped vibration under the action of the impact load to offset a part of the impact load; the second damping member (5) generates electromagnetic damping under the action of the impact load; the electromagnetic damping and the magnetic field of the adsorption member (6) form a magnetic damping effect to offset another part of the impact load.

2. The worm gear mechanism shock absorber according to claim 1, characterized in that: The first damping member (4) comprises a piezoelectric body (41), a coil (42) mounted on the piezoelectric body (41), and a wire (43) for connecting the piezoelectric body (41) and the coil (42).

3. The worm gear mechanism shock absorber according to claim 2, characterized in that: One end of the piezoelectric body (41) is connected to the second damping member (5), and the other end is connected to the push rod (2).

4. The worm gear mechanism shock absorber according to claim 1, characterized in that: The second damping member (5) is elastic and pre-pressed in the housing (1).

5. The worm gear mechanism shock absorber according to claim 4, characterized in that: The second damping member (5) is spiral-shaped.

6. The worm gear mechanism shock absorber according to claim 1, characterized in that: One end of the push rod (2) is provided with a groove for abutting against the worm gear transmission mechanism.

7. The worm gear mechanism shock absorber according to claim 1, characterized in that: There are a plurality of adsorption members (6), and the plurality of adsorption members (6) are attached to the inner wall of the shell (1) in a ring shape.

8. The worm gear mechanism shock absorber according to claim 1, characterized in that: It also includes a vibration isolating member (3) arranged between the worm gear transmission mechanism and the push rod (2).

9. A steering system, characterized in that: The invention comprises a control mechanism, a driving mechanism, a worm gear mechanism, a steering actuator and a worm gear mechanism shock absorber as claimed in any one of claims 1 to 8 of an automobile. When a driver turns the control mechanism, the driving mechanism will drive the worm gear mechanism to rotate and transmit the steering torque to the steering actuator through the worm gear mechanism to realize steering. The first damping member (4) and the second damping member (5) of the worm gear mechanism shock absorber are used to reduce the vibration of the worm gear mechanism during steering to ensure smooth steering.

10. An automobile, characterized in that: Comprising a steering system as claimed in claim 9.

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