CN215435897U - Suspension device - Google Patents

Abstract

The utility model provides a suspension device which can reduce the number of parts and restrain the strength and durability of a shock absorber from reducing when the shock absorber and a steering knuckle are positioned. The suspension device 1 includes a damper 2 supported by a vehicle body and having a cylindrical portion 13 on a lower side, and a knuckle 32 having a connecting portion 34 connected to the cylindrical portion 13 and rotatably supporting a wheel. The coupling portion 34 includes a cylindrical damper insertion portion 35 into which the cylindrical portion 13 is inserted, a holding portion 36 that fixedly holds the damper insertion portion 35 to the cylindrical portion 13, and a positioning portion 37 that is positioned to the cylindrical portion 13. The cylindrical portion 13 has a reinforcing rib 41, and the reinforcing rib 41 is formed integrally with the cylindrical portion 13, protrudes outward from the cylindrical portion 13, and engages with the positioned portion 37 to position the knuckle 32.

Description

Suspension device

Technical Field

The present invention relates to a suspension 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 ]

When a shock absorber of a suspension device and a knuckle supporting a wheel are coupled, the shock absorber and the knuckle are positioned in consideration of assemblability. Conventionally, the positioning between the damper and the knuckle is performed by a positioning member fixed to the damper by welding.

Conventionally, since a positioning member is separately provided for positioning between the damper and the knuckle, the number of parts increases, and assembly takes time. In addition, since the positioning member is fixed to the damper by welding, strength durability of the welded portion of the positioning member in the damper is reduced by the influence of heat. The welded portion having reduced strength durability becomes a portion which is easily bent when a bending load is applied to the damper.

The utility model aims to provide a suspension device which can reduce the number of parts and restrain the strength and durability of a shock absorber from reducing when the shock absorber and a steering knuckle are positioned.

[ means for solving the problems ]

(1) The present invention provides a suspension device including a shock absorber supported by a vehicle body and having a cylindrical portion on a lower side thereof, and a knuckle having a connecting portion connected to the cylindrical portion and rotatably supporting a wheel, wherein the connecting portion has a cylindrical shock absorber insertion portion into which the cylindrical portion is inserted, a holding portion that fixedly holds the shock absorber insertion portion to the cylindrical portion, and a positioning portion that is positioned on the cylindrical portion, the cylindrical portion has a reinforcing rib that is integrally formed with the cylindrical portion, protrudes outward from the cylindrical portion, and positions the knuckle by engaging with the positioning portion.

(2) In the above (1), the reinforcing rib of the present invention may be provided to extend downward and gradually incline inward downward.

(3) In the present invention, in the above (1) or (2), the cylindrical portion may have an extension portion extending outward beyond the cylindrical portion above the cylindrical portion, and the reinforcing rib may be provided to extend downward from the extension portion.

(4) In any one of the above (1) to (3), the damper insertion portion of the present invention may be formed by cutting the peripheral side wall in the axial direction so as to open a part of the peripheral side wall in the circumferential direction, and may have flexibility so that the open both end portions thereof can be brought close to or separated from each other, the holding portion may have a pair of engaging pieces which protrude outward from the open both end portions and face each other, and may be fastened to each other by a fastening member, and the positioned portion may be formed by a gap between the open both end portions.

Drawings

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

Fig. 2 is a sectional view showing a shock absorber of the suspension device of fig. 1.

Fig. 3 is a schematic view showing a lower end portion of a suspension device according to an embodiment of the present invention.

Fig. 4 is a schematic view showing a cylindrical portion of the damper.

Fig. 5 is a schematic plan view showing a lower end portion of a suspension device according to an embodiment of the present invention.

Detailed Description

Fig. 1 is a schematic side view showing a suspension device according to an embodiment of the present invention. Fig. 2 is a sectional view showing a shock absorber of the suspension device of fig. 1. Fig. 3 is a schematic view showing a lower end portion of a suspension device according to an embodiment of the present invention. Fig. 4 is a schematic view showing a cylindrical portion of the damper. Fig. 5 is a schematic plan view showing a lower end portion of a suspension device according to an embodiment of the present invention. Note that, in fig. 1 and 2, a description of a knuckle described later is omitted, and in fig. 3, a description of a housing described later is omitted.

The suspension device 1 of the present embodiment is used for a vehicle such as a four-wheel automobile. The suspension device 1 includes a damper 2 supported by a vehicle body, a spring 3 provided in the damper 2, and a knuckle 32 rotatably supporting a wheel.

The shock absorber 2 is an electromagnetic shock absorber. The damper 2 includes a cylindrical inner tube 4, a cylindrical outer tube 5 into which the inner tube 4 is inserted so as to be movable forward and backward, and a housing 6 in which the outer tube 5 is provided. The inner cylinder 4 is cylindrical and opens downward. A nut 7 is provided at the lower part of the inner cylinder 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 portion 7 is fixed to the inner peripheral surface of the inner tube 4. The outer cylinder 5 is cylindrical and opens in the vertical direction, and has a diameter larger than that of the inner cylinder 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 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. The recess constitutes the cylindrical portion 13 of the damper 2. The cylindrical portion 13 is cylindrical and opens upward, and is located inward of the side wall of the housing 6. In other words, the side end portion of the housing 6 constitutes the protruding portion 33 that protrudes further outward in the diameter direction of the cylindrical portion 13 than the cylindrical portion 13. That is, as shown in fig. 4, the suspension device 1 has an extension portion 33 extending outward beyond the cylindrical portion 13 above the cylindrical portion 13. 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 circumferential surface of the upper through-hole 10, the inner circumferential surface of the cylindrical portion 13, and the inner circumferential surface of the lower through-hole 14, respectively. The bearing 15 of the upper through-hole 10 and the bearing 16 of the cylindrical portion 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. A threaded shaft 20 is located inside the outer cylinder 5, the threaded shaft 20 having a threaded groove 19 into which the plurality of balls 18 enter. The screw shaft 20 is rotatably held in the housing 6 via the 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 20 accommodated in the housing 6.

The inner cylinder 4 is screwed on the threaded shaft 20. Specifically, the nut portion 7 of the inner tube 4 is screwed to the threaded shaft 20 via the balls 18. In a state where the inner tube 4 is screwed around the screw shaft 20, the screw shaft 20 is inserted through the nut portion 7 of the inner tube 4 and positioned inside the inner tube 4. In addition, a cylindrical gap 22 is formed between the outer peripheral surface of the inner tube 4 and the inner peripheral surface of the outer tube 5 in a state where the inner tube 4 is screwed around the threaded shaft 20. An inner cylinder side bushing 23 provided in the inner cylinder 4 and an outer cylinder side bushing 24 provided in the outer cylinder 5 are positioned in the cylindrical gap 22. The inner cylinder side boss 23 is formed to extend in a circular ring shape from the outer peripheral surface of the inner cylinder 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 inner cylinder 4 is displaceable in the axial direction relative to the outer cylinder 5. By providing the inner cylinder-side boss 23 and the outer cylinder-side boss 24 as described above, the inner cylinder-side boss 23 and the outer cylinder-side boss 24 can be brought into contact with each other while maintaining the posture of the inner cylinder 4, and the inner cylinder 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 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 screw shaft 20 rotates around the axis of the screw shaft 20 by converting the linear motion of the inner tube 4 into the rotational motion. The rotation of the screw shaft 20 is transmitted to the motor 25 via the belt 28 wound around the first pulley 21 and the second pulley 27, and 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 20 damps the linear motion of the inner tube 4 when 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.

As described above, the damper 2 has the structure in which the inner cylinder 4 and the outer cylinder 5 are positioned above the housing 6, and the cylindrical portion 13 is formed in the lower wall portion 12 of the housing 6, and therefore, the cylindrical portion 13 is provided on the lower side. The cylindrical portion 13 of the damper 2 is coupled to the knuckle 32. The knuckle 32 has a connecting portion 34 connected to the cylindrical portion 13 of the damper 2. The coupling portion 34 includes a damper insertion portion 35 into which the cylindrical portion 13 is inserted, a holding portion 36 that fixedly holds the damper insertion portion 35 to the cylindrical portion 13, and a positioned portion 37 that is positioned to the cylindrical portion 13.

The damper insertion portion 35 is cylindrical. Specifically, the damper insertion portion 35 has a substantially "C" shape in plan view, which is formed by cutting along the axial direction so that a circumferential side wall of a cylindrical body that opens in the up-down direction is partially open in the circumferential direction, and has flexibility such that the open both end portions thereof can be brought close to or separated from each other. The holding portion 36 has a pair of engaging pieces 38, 39 projecting outward from both open end portions of the damper insertion portion 35. The pair of engaging pieces 38, 39 face each other. The pair of engaging pieces 38, 39 are fastened to each other by a fastening member 40. Specifically, a circular hole is formed in one of the pair of engaging pieces 38, 39 so as to penetrate in a direction intersecting the axial direction of the damper insertion portion 35, and a screw hole is formed in the other engaging piece 39 on the same axis as the circular hole. Then, the fastening member 40 such as a bolt is screwed into the screw hole of the other engaging piece 39 through the circular hole of the one engaging piece 38, whereby the pair of engaging pieces 38, 39 are fastened to each other by the fastening member 40. As described above, the fastening member 40 is screwed into the screw hole through the circular hole, and the engaging pieces 38 and 39 approach each other, thereby reducing the diameter of the damper insertion portion 35. The positioned portion 37 is formed by a gap between the open both end portions of the damper insertion portion 35. As described above, the damper insertion portion 35 is cut along the axial direction, and therefore, the positioned portion 37 is formed along the axial direction of the damper insertion portion 35.

The cylindrical portion 13 includes a reinforcing rib 41, and the reinforcing rib 41 is engaged with the positioned portion 37 to position the knuckle 32 with respect to the cylindrical portion 13. The reinforcing rib 41 is formed integrally with the cylindrical portion 13 so as to protrude outward in the radial direction of the cylindrical portion 13 from the cylindrical portion 13. The reinforcing rib 41 is provided in the cylindrical portion 13 so as to extend downward from the extension portion 33 along the axial direction of the cylindrical portion 13. The outer end of the reinforcing rib 41 is inclined inward in a downward direction. The reinforcing rib 41 of the present embodiment has a substantially triangular pyramidal shape in which the horizontal cross-sectional area gradually decreases downward, and protrudes in a substantially triangular shape so as to gradually taper outward in a plan view. The outer side portion 42 of the reinforcing rib 41 is inclined inward in a downward direction.

As shown in fig. 3 and 5, in a state where the cylindrical portion 13 is inserted into the damper insertion portion 35, the diameter of the damper insertion portion 35 is reduced by screwing the fastening member 40 from the circular hole of one engagement piece 38 into the screw hole of the other engagement piece 39, and the cylindrical portion 13 is fastened, thereby connecting the cylindrical portion 13 of the damper 2 and the knuckle 32. In this coupled state, the reinforcing rib 41 integrally formed with the cylindrical portion 13 is positioned in the positioned portion 37, which is a gap between the open both end portions of the damper insertion portion 35. At this time, both open ends of the damper insertion portion 35 are in contact with the reinforcing ribs 41. Thereby, the knuckle 32 is positioned in the circumferential direction with respect to the cylindrical portion 13 of the damper 2.

In the case of the present embodiment, the reinforcing rib 41 of the cylindrical portion 13 engages with the positioned portion 37, whereby the knuckle 32 and the cylindrical portion 13 of the damper 2 can be positioned in the circumferential direction. Therefore, in the case of the present embodiment, it is not necessary to separately provide a positioning member for positioning when the knuckle 32 and the damper 2 are coupled, and the number of parts can be reduced. When a positioning member is separately provided as in the conventional case, the positioning member is fixed to the damper by welding. When the positioning member is fixed to the damper by welding, the welded portion is likely to be a weak point and be bent due to the influence of heat, but in the case of the present embodiment, such a problem does not occur because the reinforcing rib 41 is integrally formed with the cylindrical portion 13. This can suppress a decrease in strength durability of the damper 2.

As described above, the reinforcing rib 41 is integrally formed with the cylindrical portion 13. In order to integrally form the reinforcing ribs 41 and the cylindrical portion 13 as described above, in the present embodiment, the damper 2 having the cylindrical portion 13 is not formed by a steel pipe as in the conventional case, but the damper 2 is formed by casting or forging. Thus, the damper 2 of the present embodiment has a higher degree of freedom of shape than the conventional damper.

In the present embodiment, the outer end of the reinforcing rib 41 is inclined inward in a downward direction. This prevents the outer end of the reinforcing rib 41 from interfering with the fastening member 40, i.e., the bolt. In the present embodiment, the reinforcing rib 41 is provided to extend downward from the extension 33 of the housing 6. This can improve the rigidity against a bending load acting on the cylindrical portion 13 of the damper 2 from the knuckle 32 via the connecting portion 34. In the present embodiment, in a state where the cylindrical portion 13 is inserted into the damper insertion portion 35, the cylindrical portion 13 of the damper 2 and the knuckle 32 are coupled by screwing the fastening member 40, i.e., the bolt, into the screw hole of the other engagement piece 39 from the circular hole of the one engagement piece 38. With this configuration, the coupling portion between the damper 2 and the knuckle 32 can be configured to have a simple structure.

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 reinforcing rib 41 has a substantially triangular pyramid shape, but the shape is not limited thereto, and may be changed to a more appropriate shape.

In the above embodiment, the positioned portion 37 is formed by the gap between the open both end portions of the damper insertion portion 35, but the present invention is not limited to this. The positioned portion 37 may be engaged with the reinforcing rib 41, and may be, for example, a recess or a groove formed in the inner peripheral surface of the damper insertion portion 35, or a notch formed in the damper insertion portion 35.

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.

In the above embodiment, an electromagnetic absorber is used as the absorber 2, but the present invention is not limited to this. A general hydraulic damper or the like can be used as the damper 2.

Reference numerals

1: suspension device

2: shock absorber

3: spring

4: inner cylinder

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: cylindrical part

14: lower through hole

15. 16, 17: bearing assembly

18: ball bearing

19: thread groove

20: threaded shaft

21: first pulley

22: cylindrical gap

23: inner cylinder side shaft sleeve

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: steering knuckle

33: extension part

34: connecting part

35: damper insertion part

36: holding part

37: positioned part

38. 39 engaging piece

40: fastening member

41: reinforcing rib

42: an outer side portion.

Claims (4)

1. A suspension device comprising a shock absorber supported by a vehicle body and having a cylindrical portion on a lower side thereof, and a knuckle having a connecting portion connected to the cylindrical portion and rotatably supporting a wheel, wherein,

the connecting part has a cylindrical damper insertion part into which the cylindrical part is inserted, and the damper is inserted into the cylindrical part

A holding portion which is fixed and held to the cylindrical portion, and a positioning portion which is positioned to the cylindrical portion,

the cylindrical portion has a reinforcing rib formed integrally with the cylindrical portion and protruding outward from the cylindrical portion, and the reinforcing rib is engaged with the positioned portion to position the knuckle.

2. The suspension device according to claim 1, wherein the reinforcing rib extends downward and is inclined inward in a downward direction.

3. The suspension device according to claim 1 or 2, wherein an extension portion that extends outward beyond the cylindrical portion is provided above the cylindrical portion,

the reinforcing rib extends downward from the protruding portion.

4. The suspension device according to claim 1, wherein the damper insertion portion is cut along the axial direction so that a part of the circumferential side wall is open in the circumferential direction, and has flexibility such that both open end portions thereof can be brought close to or separated from each other,

the holding portion has a pair of engaging pieces which protrude outward from the open both end portions and face each other, and which are fastened to each other by a fastening member,

the positioned portion is formed by a gap between the open both end portions.

Images