CN215444889U - Shock-absorbing device - Google Patents

Abstract

The utility model provides an electromagnetic damping device capable of suppressing loosening of a fastening member. A damper device 2 provided on a vehicle body, the damper device 2 comprising: an electric motor 25; a threaded shaft portion 20 that is rotated by the transmission of the rotational torque of the motor 25; a damper rod 4 that moves up and down according to the rotation of the threaded shaft portion 20; a damper base 32 that is fixed to the vehicle body and elastically supports the upper portion of the damper rod 4; an upper nut 60 fastened to an upper end portion of the damper base 32 and holding the damper rod 4 to the damper base 32; and a load transmission portion 100 that is provided between the damper rod 4 and the damper base 32 and transmits the rotational load transmitted from the threaded shaft portion 20 to the damper rod 4 to the damper base 32.

Description

Shock-absorbing device

Technical Field

The present invention relates to a shock absorbing device.

Background

Patent document 1 discloses a suspension device that attenuates vibration or shock applied to a vehicle. The suspension device includes a damper composed of a feed screw mechanism portion including a threaded shaft portion and a nut, and a motor connected to the threaded shaft portion. The threaded shaft portion rotates around the rotation axis by converting the linear motion of the nut into a rotational motion. The rotation of the threaded shaft portion is transmitted to the motor via the rotation transmission mechanism portion, and an induced electromotive force is generated in the motor. And a control unit that generates a rotational torque for rotating the motor in a reverse direction based on the induced electromotive force. The threaded shaft portion damps the linear motion of the nut when receiving the rotational torque. In this way, the suspension device can damp vibrations and the like applied to the vehicle.

[ Prior art documents ]

(patent document)

Patent document 1: japanese patent laid-open publication No. 2016-17535

SUMMERY OF THE UTILITY MODEL

[ problem to be solved by the utility model ]

However, from the viewpoint of maintenance such as replacement of a shield or a coil spring, it is necessary to configure the damper so as to be detachable. Therefore, the damper cannot be integrated by welding or the like, and it is usually necessary to fix the upper portion of the damper rod by a fastening member such as a nut.

However, in the electromagnetic damper described in patent document 1, the rotational load of the threaded shaft portion is also transmitted to the fastening member such as a nut, and the fastening member such as a nut may be loosened. The loosening of the fastening member is an important problem to be solved because it causes the separation of the damper or abnormal noise.

The utility model aims to provide an electromagnetic damping device capable of restraining loosening of a fastening component.

[ means for solving the problems ]

(1) The present invention provides a damper device provided on a vehicle body, the damper device including: an electric motor; a threaded shaft portion that is rotated by the transmission of the rotational torque of the motor; a damper rod that moves up and down in accordance with rotation of the threaded shaft portion; a damper base fixed to the vehicle body and elastically supporting an upper portion of the damper rod; a fastening member fastened to an upper end portion of the damper base and holding the damper rod to the damper base; and a load transmission portion provided between the damper rod and the damper base and transmitting a rotational load transmitted from the threaded shaft portion to the damper rod to the damper base.

(2) In the damper device according to (1), the load transmission unit may include: a first saw tooth formed on an outer circumferential surface of an upper portion of the damper rod; and a second serration formed on an inner circumferential surface of the annular inner member and fitted to the first serration, the inner circumferential surface of the annular inner member into which an upper portion of the damper rod is inserted, and an outer circumferential portion of the annular inner member being elastically supported by the damper base; one of the first saw tooth and the second saw tooth has a torsion angle with respect to an axial direction.

(3) In the damper device according to (2), the load transmission unit may include: a first protrusion formed on an outer peripheral surface of the inner member and protruding outward in a diameter direction; and a pair of second protruding portions formed on the damper base and disposed so as to sandwich the first protruding portion so as to restrict rotation of the first protruding portion.

(4) In the damper device according to any one of (1) to (3), the thread groove direction of the threaded shaft portion may be a direction in which the threaded shaft portion rotates in the tightening direction of the tightening member when the damper device is contracted.

[ effects of the utility model ]

According to the present invention, it is possible to provide an electromagnetic damper device capable of suppressing loosening of a fastening member.

Drawings

Fig. 1 is a side view showing a suspension device including a damper device according to an embodiment of the present invention.

Fig. 2 is a sectional view showing the damper device according to the embodiment.

Fig. 3 is a sectional view showing a load transmission portion of the damper device according to the above embodiment.

Fig. 4 is a sectional view showing a damper rod and an inner member of the damper device according to the foregoing embodiment.

Fig. 5 is a cross-sectional view showing the first projecting portion and the pair of second projecting portions of the damper device according to the foregoing embodiment.

Detailed Description

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a side view showing a suspension device including a damper device according to an embodiment of the present invention. Fig. 2 is a sectional view showing the damper device according to the present embodiment. In fig. 2, a damper mount or the like disposed at an upper end portion of the damper device 2 and fixed to the vehicle body is not shown. The suspension device 1 shown in fig. 1 and 2 is used for a vehicle such as a four-wheel automobile. The suspension device 1 includes a damper 2 provided in a vehicle body, and a spring 3 provided on the outer side in the diameter direction of the damper 2.

The damping device 2 is an electromagnetic damper. The damper device 2 includes a damper rod 4 formed of a cylindrical inner tube, a cylindrical outer tube 5 into which the damper rod 4 is inserted so as to be movable forward and backward, and a housing 6 in which the outer tube 5 is provided. The damper rod 4 is cylindrical and opens downward. A nut 7 is provided at the lower part inside the damper rod 4. The nut portion 7 is cylindrical and opens in the vertical direction, and has an inner hole as a threaded hole 8. The outer peripheral surface of the nut 7 is fixed to the inner peripheral surface of the damper rod 4. The outer cylinder 5 is cylindrical and opens in the vertical direction, and has a diameter larger than that of the damper rod 4.

The housing 6 has a substantially rectangular shape in side view and a hollow shell shape. An upper through hole 10 for communicating the inside and outside of the case 6 is formed in the upper wall portion 9 of the case 6. An upper opening 11 for communicating the inside and outside of the case 6 is formed in the upper wall portion 9 of the case 6 adjacent to the upper through hole 10. A recess 13 is formed in the lower wall portion 12 of the housing 6 so as to bulge downward in correspondence with the upper through hole 10. In the lower wall portion 12 of the housing 6, a lower through hole 14 is formed to communicate the inside and the outside of the housing 6 so as to correspond to the upper opening 11. Bearings 15, 16, and 17 are provided on the inner peripheral surface of the upper through-hole 10, the inner peripheral surface of the recess 13, and the inner peripheral surface of the lower through-hole 14, respectively. The bearing 15 of the upper through hole 10 and the bearing 16 of the recess 13 are located on the same axis.

As shown in fig. 2, the outer cylinder 5 is erected on an upper wall portion 9 of the housing 6. At this time, the lower end portion in the axial direction of the outer cylinder 5 is fixed to the upper wall portion 9 of the housing 6 so that the inside of the outer cylinder 5 and the inside of the housing 6 communicate with each other through the upper through hole 10. The outer cylinder 5 includes a threaded shaft portion 20 inside, and the threaded shaft portion 20 has a threaded groove 19 into which the plurality of balls 18 enter. The threaded shaft portion 20 is rotatably held in the housing 6 via bearings 15 and 16 in a state where the lower end portion is accommodated in the housing 6. A first pulley 21 is provided at a lower end portion of the threaded shaft portion 20 housed in the housing 6.

The damper rod 4 is screwed to the threaded shaft portion 20. Specifically, the nut portion 7 of the damper rod 4 is screwed to the threaded shaft portion 20 via the ball 18. In a state where the damper rod 4 is screwed onto the threaded shaft portion 20, the threaded shaft portion 20 penetrates the nut portion 7 of the damper rod 4 and is positioned inside the damper rod 4. In addition, in a state where the damper rod 4 is screwed to the threaded shaft portion 20, a cylindrical gap 22 is formed between the outer peripheral surface of the damper rod 4 and the inner peripheral surface of the outer cylinder 5. A damper-rod-side bushing 23 provided on the damper rod 4 and an outer-cylinder-side bushing 24 provided on the outer cylinder 5 are positioned in the cylindrical gap 22. The damper rod-side boss 23 is formed to extend in a circular ring shape from the outer peripheral surface of the damper rod 4 to the outside in the diameter direction. The outer cylinder side sleeve 24 is formed to annularly project from the inner circumferential surface of the outer cylinder 5 toward the inside in the diameter direction.

According to this structure, the damper rod 4 is displaceable in the axial direction with respect to the outer cylinder 5. By providing the damper rod-side boss 23 and the outer cylinder-side boss 24 as described above, the damper rod-side boss 23 and the outer cylinder-side boss 24 can be brought into contact with each other while maintaining the posture of the damper rod 4, and the damper rod 4 can be prevented from coming off the outer cylinder 5.

As shown in fig. 2, a motor 25 is provided in the upper opening 11 of the housing 6. At this time, the output shaft 26 of the motor 25 passes through the lower wall portion 12 of the housing 6 through the bearing 17. A second pulley 27 is provided at a portion of the output shaft 26 accommodated in the housing 6. The second pulley 27 is located at a position corresponding to the first pulley 21 provided on the threaded shaft portion 20. An endless belt 28 is wound around the first pulley 21 and the second pulley 27. In the present embodiment, the electric motor 25 is a conventionally known motor.

The damper 2 is controlled by a controller not shown. Specifically, the threaded shaft portion 20 rotates around the axis of the threaded shaft portion 20 by converting the linear motion of the damper rod 4 into the rotational motion. The rotation of the threaded shaft 20 is transmitted to the motor 25 via the belt 28 wound around the first pulley 21 and the second pulley 27, and an induced electromotive force is generated in the motor 25. The controller generates a rotational torque for rotating the output shaft 26 of the motor 25 in the reverse direction based on the induced electromotive force. The threaded shaft portion 20 damps the linear motion of the damper rod 4 by receiving the rotational torque.

The spring 3 is, for example, a compression spring, i.e., a coil spring. The spring 3 is located between an upper spring receiving member 30 provided in the bellows-shaped shield 29 and a lower spring receiving member 31 provided in the outer cylinder 5. The damper 2 is urged to extend by a spring 3.

Fig. 3 is a sectional view showing the load transmission unit 100 of the damper device 2 according to the present embodiment. The damper device 2 of the present embodiment includes the motor 25, the threaded shaft portion 20 that is rotated by the transmission of the rotational torque of the motor 25, and the damper rod 4 that moves up and down in accordance with the rotation of the threaded shaft portion 20, as well as a damper base 32 that elastically supports the upper portion of the damper rod 4, an upper nut 60 that is a fastening member for holding the damper rod 4 on the damper base 32, and a load transmission portion 100 that transmits the rotational load transmitted from the threaded shaft portion 20 to the damper rod 4 to the damper base 32.

The damper mount 32 is positioned between the vehicle body and the damper device 2, and is fixed to the vehicle body by fixing members such as bolts, not shown. The damper base 32 includes an upper bracket 37 and a lower bracket 38 disposed vertically, a damper base rubber pad 33 located in a space between the upper bracket 37 and the lower bracket 38, a rubber pad bracket 34 supporting the damper base rubber pad 33, and an upper rubber pad 35 provided on the lower bracket 38.

The upper bracket 37 is cylindrical and opens downward, and has an annular flange 37a projecting outward in the radial direction at the lower end portion. The lower bracket 38 is cylindrical and opens upward, and has an annular flange 38a protruding outward in the radial direction at the upper end. The upper bracket 37 and the lower bracket 38 are fixed by welding or the like in a state where the flange 37a of the upper bracket 37 and the flange 38a of the lower bracket 38 overlap each other. Thus, a space formed by the inside of the upper bracket 37 and the inside of the lower bracket 38 is formed between the upper bracket 37 and the lower bracket 38.

In the space between the upper bracket 37 and the lower bracket 38, a damper base rubber pad 33 is provided. The damper base rubber pad 33 is annular in plan view, and is formed of an elastic member such as rubber. The damper base rubber pad 33 is hollow and has a cutout formed in the inner peripheral surface thereof in the circumferential direction. As shown in fig. 3, the damper base rubber pad 33 is supported on the upper bracket 37 and the lower bracket 38 via the rubber pad bracket 34 so that the axial direction thereof is along the axial direction of the upper bracket 37 and the lower bracket 38.

The upper nut 60 is a nut having a threaded hole, which is fastened to the upper end of the damper base 32. The tightening of the upper nut 60 will be described later together with the load transmission portion 100.

Fig. 4 is a sectional view showing the damper rod 4 and the inner member 50 of the damper device 2 according to the present embodiment. The load transmission portion 100 is provided between the damper rod 4 and the damper mount 32, and has: a first serration 44 formed on an outer circumferential surface of an upper portion of the damper rod 4; and second serrations 54 formed on an inner peripheral surface of the annular inner member 50 elastically supported by the damper base 32.

As shown in fig. 4, the diameter of the upper portion of the damper rod 4 is gradually reduced, and the upper portion of the damper rod 4 includes a rod large diameter portion 41, a rod middle diameter portion 42, a rod small diameter portion 43, and a rod tip portion 45 in this order from below. The inner member 50 is cylindrical and opens in the vertical direction, and has an inner flange 51 projecting outward in the radial direction at the upper end.

The first serrations 44 are formed on the outer peripheral surface of the shank small diameter portion 43 in a serration shape in which a plurality of teeth are formed at intervals. The first serrations 44 of the present embodiment have a twisted angle with respect to the axial direction. Specifically, the first saw teeth 44 have a helical tooth shape. The second serration 54 is formed on the inner circumferential surface of the inner member 50 in a serration shape in which a plurality of teeth are formed at intervals.

With this configuration, the upper portion of the damper rod 4 is inserted and press-fitted into the inner periphery of the inner member 50, and the second serrations 54 are fitted into the first serrations 44. Specifically, the small diameter portion 43 of the damper rod 4, on which the first serrations 44 are formed, is fitted into the inner periphery of the inner member 50, on which the second serrations 54 are formed, and the first serrations 44 and the second serrations 54 are fitted to each other. In this fitted state, the inner member 50 is placed on the stepped portion between the small rod diameter portion 43 and the medium rod diameter portion 42.

Thus, according to the present embodiment, since the saw-teeth mesh with each other and are press-fitted, the rotational load (torque) generated in the damper rod 4 can be efficiently transmitted to the vehicle body via the damper mount 32 without generating a gap. That is, the torque transmitted from the damper rod 4 is transmitted from the pressed-in serration to the vehicle body through the damper base rubber pad 33 of the damper base 32, and therefore, the torque can be suppressed from being transmitted to the upper nut 60 of the fastening member. Therefore, according to the present embodiment, the loosening of the upper nut 60 of the fastening member can be suppressed. Further, according to the present embodiment, the mounting and dismounting can be performed by controlling the meshing amount of the saw teeth with each other in the elastic deformation range.

Fig. 5 is a sectional view showing the first projecting portion 55 and the pair of second projecting portions 39, 39 of the damper device 2 according to the present embodiment. As shown in fig. 3 and 5, the load transmission portion 100 includes a first protrusion 55 formed on the outer peripheral surface of the inner member 50 and a pair of second protrusions 39, 39 formed on the damper base 32, in addition to the first serrations 44 and the second serrations 54. The first protruding portion 55 is formed on the outer peripheral surface of the lower portion of the inner 50 so as to protrude outward in the radial direction of the inner 50. The pair of second protrusions 39, 39 are formed on the damper base 32, and are arranged so as to sandwich the first protrusion 55 so as to restrict the rotation of the first protrusion 55. More specifically, the pair of second protruding portions 39, 39 are formed on the bottom surface of the lower bracket 38 so as to protrude upward, and are located at positions spaced apart from each other in the circumferential direction of the damper base with the first protruding portion 55 interposed therebetween.

In the case where the load transmission unit 100 of the present embodiment is not provided as in the related art, the torsional load is transmitted from the damper rod 4 to the damper base rubber pad, and thus the durability of the damper base rubber pad is deteriorated. In contrast, according to the present embodiment, in addition to the press-fitting of the damper rod 4 and the inner member 50 by the serration, the rotation can be reliably restricted by the metal-contact stopper structure formed by the first protrusion 55 and the pair of second protrusions 39 and 39. Therefore, the torsion input to the damper base rubber pad 33 can be restricted, and the durability can be improved.

In the damper device 2 configured as described above, as shown in fig. 3, the upper end portion of the damper rod 4 is elastically supported by the damper base 32. Specifically, as described above, the damper rod 4 is inserted into the inner member 50, and the inner member 50 is tightened between the upper nut 60 and the stepped portion by screwing the upper nut 60 into the screw groove formed on the outer peripheral surface of the rod tip portion 45. In this state, the upper portion of the damper rod 4 is inserted through the upper bracket 37 and the lower bracket 38, the flange of the inner member 50 is inserted into the cutout of the damper base rubber pad 33, and the outer peripheral portion of the inner member 50 is elastically supported by the damper base 32. An upper cover 36 for covering the upper end of the damper rod 4 is provided on the upper bracket 37. In this way, the pair of second protruding portions 39, 39 of the damper base 32 sandwich the first protruding portion in the circumferential direction of the damper base 32 in a state where the upper end portion of the damper rod 4 is elastically supported by the damper base 32.

In the damper device 2 according to the present embodiment, the direction of the thread groove 19 of the threaded shaft portion 20 and the tightening direction of the upper nut 60 of the tightening member are defined. Specifically, the direction of the thread groove 19 of the threaded shaft portion 20 is a direction in which the threaded shaft portion 20 rotates in the tightening direction of the upper nut 60 of the tightening member when the damper device 2 contracts. Here, the directions of the torques of the threaded shaft portion 20 are opposite when the damper device 2 is extended and retracted. In addition, the direction of the torque of the threaded shaft portion 20 depends on the direction of the thread groove 19. In general, on the collision (Bump) side, that is, when the damper device 2 contracts, the load input is larger, and therefore, the direction of the thread groove 19 of the threaded shaft portion 20 is set so that a torque is generated in the tightening direction of the upper nut 60 of the fastening member at the time of the collision (Bump) input. Thus, according to the present embodiment, the tightness is ensured.

The present invention is not limited to the above-described embodiments, and variations and modifications within a range that can achieve the object of the present invention are included in the present invention.

For example, in the above-described embodiment, the example in which the present invention is applied to a four-wheel vehicle has been described, but the present invention is not limited to this. The present invention can also be applied to vehicles such as motorcycles.

Reference numerals

1: suspension device

2: shock-absorbing device

3: spring

4: shock-absorbing rod

5: outer cylinder

6: shell body

7: screw cap

8: threaded hole

9: upper wall part

10: upper through hole

11: upper part opening

12: lower wall part

13: concave part

14: lower through hole

15. 16, 17: bearing assembly

18: ball bearing

19: thread groove

20: threaded shaft portion

21: first pulley

22: cylindrical gap

23: side shaft sleeve of shock-absorbing rod

24: lateral shaft sleeve of outer cylinder

25: electric motor

26: output shaft

27: second pulley

28: leather belt

29: protective cover

30: upper spring bearing member

31: lower spring bearing member

32: shock absorber base

33: rubber pad for shock absorber base

34: rubber pad bracket

35: upper rubber pad

36: upper cover

37: upper bracket

37a, 38 a: flange

38: lower bracket

39: second protrusion

41: major diameter part of the rod

42: middle diameter part of rod

43: small diameter part of rod

44: first saw tooth

45: front end of the rod

50: inner part

51: inner flange

54: second saw tooth

55: first protruding part

60: upper nut (fastening component)

100: load transmission part

Claims (4)

1. A shock absorbing device provided in a vehicle body, the shock absorbing device comprising:

an electric motor;

a threaded shaft portion that is rotated by the transmission of the rotational torque of the motor;

a damper rod that moves up and down in accordance with rotation of the threaded shaft portion;

a damper base fixed to the vehicle body and elastically supporting an upper portion of the damper rod;

a fastening member fastened to an upper end portion of the damper base and holding the damper rod to the damper

A machine base; and a process for the preparation of a coating,

a load transmission part arranged between the damper rod and the damper base and transmitting the load from the threaded shaft part

The rotational load transmitted to the damper rod is transmitted to the damper mount.

2. The damper device according to claim 1, wherein the load transmission portion includes:

a first saw tooth formed on an outer circumferential surface of an upper portion of the damper rod; and a process for the preparation of a coating,

a second saw tooth formed on the inner peripheral surface of the annular inner member and engaged with the first saw tooth

The inner circumference of the component is used for inserting the upper part of the shock absorption rod, and the outer circumference part is elastically supported on the shock absorber base;

one of the first saw tooth and the second saw tooth has a torsion angle with respect to an axial direction.

3. The damper device according to claim 2, wherein the load transmission portion includes:

a first protrusion formed on an outer peripheral surface of the inner member and protruding outward in a diameter direction; and a process for the preparation of a coating,

a pair of second protrusions formed on the damper base to restrict rotation of the first protrusions

Is disposed so as to sandwich the first protruding portion.

4. The damper device according to claim 1, wherein the thread groove direction of the threaded shaft portion is a direction in which the threaded shaft portion rotates in the tightening direction of the tightening member when the damper device contracts.

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