CN214928801U - Suspension device - Google Patents
Suspension device Download PDFInfo
- Publication number
- CN214928801U CN214928801U CN202120424243.3U CN202120424243U CN214928801U CN 214928801 U CN214928801 U CN 214928801U CN 202120424243 U CN202120424243 U CN 202120424243U CN 214928801 U CN214928801 U CN 214928801U
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- China
- Prior art keywords
- screw shaft
- pulley
- suspension device
- ball screw
- driving force
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Abstract
The utility model discloses a suspension device compares stroke volume (the amount of displacement) that can increase nut member with in the past. The utility model discloses a suspension device, include: a belt (48) for transmitting the rotational driving force of the motor; a screw shaft-side pulley (46) connected to the inside of the belt (48) and transmitting a rotational driving force from the belt (48); a ball screw shaft (32) that rotates integrally with the screw shaft-side pulley (46) and transmits a rotational driving force; a ball screw nut (34) which is provided on the outer periphery of the ball screw shaft (32) and is provided so as to be displaceable in the axial direction of the ball screw shaft (32); and a bearing member (52) rotatably supporting the screw shaft-side pulley (46), wherein the bearing member (52) is positioned on the inner diameter side of the screw shaft-side pulley (46) and is arranged so as to overlap the ball screw shaft (32) in the radial direction.
Description
Technical Field
The present invention relates to a suspension (suspension) device that generates a damping force by using a rotational driving force of a motor.
Background
For example, patent document 1 discloses a suspension device that generates a damping force by displacing a shock absorber (damper).
In the suspension device disclosed in patent document 1, the rotational driving force of the motor is transmitted to the ball screw mechanism via a belt (belt) and a motor-side pulley and a screw-shaft-side pulley to which the belt is suspended. The ball screw shaft is rotatably supported via a pair of bearings. In the ball screw mechanism, a rotational driving force transmitted from a motor is converted into a linear motion, and thereby a ball screw nut is linearly reciprocated.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent No. 6199821 publication
SUMMERY OF THE UTILITY MODEL
[ problem to be solved by the utility model ]
In the suspension device disclosed in patent document 1, the screw shaft-side pulley and the two bearings are arranged in parallel so as to sandwich the screw shaft-side pulley. The purpose is as follows: the ball screw shaft is supported at both ends rather than by cantilevers, so that the deflection angle of the shaft due to belt tension is reduced, and the inclination of the pulley on the screw shaft side is reduced, thereby preventing friction deterioration and riding comfort deterioration due to belt meshing deterioration, and preventing durability from decreasing. Therefore, in the suspension device disclosed in patent document 1, the distance over which the ball screw nut can travel, that is, the distance over which the suspension can travel, is shortened in accordance with the width dimension of the bearing, and therefore the suspension device is increased in size.
In order to secure a distance over which the ball screw nut can travel, it is conceivable to remove the one-side bearing and cantilever-support the screw shaft-side pulley. However, in order to reduce the inclination of the screw shaft side pulley, it is necessary to enlarge the outer diameter of the ball screw shaft, and the peripheral components are also enlarged, and the weight is also increased.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a suspension device which has excellent riding comfort, can prevent deterioration of riding comfort and durability due to deterioration of friction, and can increase the stroke amount (displacement amount) of a nut member, that is, the stroke amount of the suspension device, without increasing the size of the suspension device as compared with the conventional suspension device.
[ means for solving problems ]
In order to achieve the object, the present invention is characterized by comprising: an electric motor; a transmission member that transmits a rotational driving force of the motor; a pulley connected to an inner side of the transmission member and transmitting a rotational driving force from the transmission member; a lever member that rotates integrally with the pulley and transmits a rotational driving force from the pulley; a nut member provided on an outer periphery of the rod member, the nut member being provided so as to be displaceable in an axial direction of the rod member by transmitting a rotational driving force from the rod member; and a bearing member rotatably supporting the pulley, the bearing member being positioned on an inner diameter side of the pulley and arranged to overlap the rod member in a radial direction.
[ effects of the utility model ]
The present invention can provide a suspension device having excellent riding comfort, and capable of preventing deterioration of riding comfort and durability due to friction deterioration, and increasing the stroke amount (shift amount) of a nut member, that is, the stroke amount of the suspension device, without increasing the size of the suspension device, as compared with the conventional suspension device.
Drawings
Fig. 1 is a sectional view of a suspension device according to an embodiment of the present invention along an axial direction.
Fig. 2 is a partially enlarged sectional structural view of fig. 1.
Fig. 3 is an explanatory diagram showing a separation distance between a force point of the belt and a fulcrum of the bearing member.
Fig. 4 is a sectional configuration view of a suspension device according to another embodiment of the present invention.
Fig. 5 is a partially enlarged sectional structural view of fig. 4.
Fig. 6 is a partially enlarged cross-sectional configuration view showing a state in which a ball screw nut is housed in a space portion of the screw shaft-side pulley.
[ description of reference numerals ]
10. 10 a: suspension device
14: motor (electric motor)
32: ball screw shaft (rod component)
34: ball screw nut (nut component)
46. 46 a: screw shaft side pulley (Pulley)
48: belt (transferring component)
52: bearing component
56: extension part
62: outer ring
64: inner ring
66: ball bearing
74: space part
S1, S2: amount of travel
D: separation distance
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings as appropriate. Fig. 1 is a sectional configuration view of a suspension device according to an embodiment of the present invention along an axial direction, fig. 2 is a partially enlarged sectional configuration view of fig. 1, and fig. 3 is an explanatory view showing a separation distance D between a force point of a belt and a fulcrum of a bearing member. In each drawing, "up and down" indicates a vehicle up and down direction (vertical up and down direction).
As shown in fig. 1, a suspension device 10 according to an embodiment of the present invention is disposed between a vehicle body and a wheel, and includes: a substantially cylindrical housing 12 which is vertically extendable and retractable; and a motor housing 16 coupled to a lower end portion of the housing 12 and including motors (electric motors) 14 arranged in parallel in the axial direction of the housing 12. A communication passage 18 for communicating the chamber of the lower end portion of the housing 12 with the chamber of the motor housing 16 is provided between the lower end portion of the housing 12 and the lower end portion of the motor housing 16.
The upper end portion of the case 12 is attached to a vehicle body side (for example, a damper base (not shown)). The lower end of the casing 12 is attached to, for example, a trailing arm (trailing arm) or a lower swing arm (lower arm).
As shown in fig. 1, the housing 12 includes an inner tube 20 attached to the vehicle body side, and an outer tube 22 that slidably accommodates the inner tube 20.
A ball screw mechanism 30 is disposed in the housing 12. The ball screw mechanism 30 includes: a ball screw shaft (rod member) 32, a ball screw nut (nut member) 34, a plurality of balls 36, and a support portion 38.
The ball screw shaft 32 extends in the axial direction in the housing 12. The ball screw nut 34 is disposed on the outer periphery of the ball screw shaft 32, and is provided so as to be displaceable in the axial direction of the ball screw shaft 32 by transmitting a rotational driving force from the ball screw shaft 32. Each ball 36 is provided so as to roll and circulate along a track formed between the thread groove of the ball screw shaft 32 and the groove portion of the ball screw nut 34. The support portion 38 rotatably supports the lower end portion of the ball screw shaft 32 via a bearing 40.
The ball screw nut 34 is attached to a lower end portion of the inner tube 20 and is provided so as to be displaced integrally with the inner tube 20. The ball screw nut 34 includes a structure in which a plurality of components are assembled.
A rotational driving force transmission mechanism 42 that transmits the rotational motion of the motor 14 to the ball screw shaft 32 is disposed between the motor shaft 14a of the motor 14 and the ball screw shaft 32. The rotational drive force transmission mechanism 42 includes: a motor-side pulley 44 coupled to the motor shaft 14 a; a screw shaft-side pulley (pulley) 46 connected to the ball screw shaft 32 side; and a belt (transmission member) 48 that is suspended from the motor-side pulley 44 and the screw-shaft-side pulley 46, respectively, and transmits the rotational driving force of the motor 14 to the ball screw shaft 32 by rotating the screw-shaft-side pulley 46 integrally with the ball screw shaft 32. The belt 48 is provided in a loop shape and adjusted to have a predetermined tension.
The motor-side pulley 44 is rotatably supported via a bearing 50 disposed in the motor case 16. The screw shaft-side pulley 46 is rotatably supported via a bearing member 52 disposed in a chamber at the lower end portion of the housing 12.
As shown in fig. 2, the screw shaft-side pulley 46 has a shaft supporting portion 54, an extending portion 56, and a belt sliding portion 58. The shaft support portion 54 has a shaft hole 60 through which one end portion of the ball screw shaft 32 in the axial direction passes. The extending portion 56 includes an annular body extending from the center portion of the shaft supporting portion 54 toward the outer diameter side. The belt sliding portion 58 extends from the outer diameter lower end portion of the extension portion 56 to the outer diameter side by a predetermined distance, is bent in an L-shaped cross section, and is in sliding contact with the belt 48 on the outer peripheral surface.
The bearing member 52 includes, for example, a double-row angular contact ball bearing, and includes: an outer ring 62 formed by integrally connecting a pair of divided annular bodies; an inner ring 64 integrally connecting a pair of divided annular bodies; and a plurality of balls 66 rollably disposed between the outer race 62 and the inner race 64. The outer race 62 of the bearing member 52 is supported by an annular step portion 68 provided on the inner wall of the lower portion side of the housing 12 (inner tube 20). The inner race 64 of the bearing member 52 is supported by an annular step 70 provided in the extension portion 56 of the screw shaft-side pulley 46. Further, a coupling member 71 that supports the inner race 64 is coupled to the extension portion 56 of the screw shaft-side pulley 46.
Further, the bearing member 52 is positioned on the inner diameter side of the screw shaft-side pulley 46 (belt sliding portion 58), and is disposed so as to overlap the ball screw shaft 32 in the radial direction. Further, the bearing member 52, the belt (transmission member) 48, and the screw shaft-side pulley (pulley) 46 are disposed at positions that overlap each other in a radial direction around the axis of the ball screw shaft 32.
The extension 56 of the screw shaft-side pulley 46 is provided to the inner race 64 of the bearing member 52. An annular space 72 is provided between the extension portion 56 and the belt sliding contact portion 58 in the radial direction of the screw shaft-side pulley 46. The lower end of the housing 12 is disposed facing the annular space 72. The belt sliding portion 58 of the screw shaft-side pulley 46 has a diameter larger than the outer diameter of the housing 12.
The suspension device 10 of the present embodiment is basically configured as described above, and the operation and operational effects thereof will be described below.
The suspension device 10 of the present embodiment generates a damping force electromagnetically by the motor 14, not by a conventional device using a hydraulic or non-compressible fluid. Specifically, when an external force is input to the suspension device 10, the ball screw nut 34 moves linearly in the axial direction of the ball screw shaft 32 integrally with the inner tube 20. The ball screw shaft 32 rotates by converting the linear motion of the ball screw nut 34 into a rotational motion. The rotation of the ball screw shaft 32 is transmitted to the motor 14 via the screw shaft-side pulley 46, the belt 48, and the motor-side pulley 44, and induced electromotive force is generated in the motor 14.
Therefore, a control unit, not shown, that controls the motor 14 generates a rotational driving force for rotating the motor 14 in the reverse direction based on the induced electromotive force generated in the motor 14. The ball screw shaft 32 receives the rotational driving force from the motor 14, and thereby attenuates the linear motion of the ball screw nut 34. As a result, the suspension device 10 can alleviate vibration and the like input by external force.
In the present embodiment, by disposing the bearing member 52 on the inner diameter side of the screw shaft-side pulley 46, the stroke amount (displacement amount) S1 of the ball screw nut 34 can be increased in accordance with the length (width-direction dimension) of the bearing member 52, while keeping the deflection angle of the ball screw shaft 32 (inclination of the screw shaft-side pulley 46) small, compared to the conventional art.
In the present embodiment, the bearing member 52, the belt (transmission member) 48, and the screw shaft-side pulley (pulley) 46 are disposed at positions that overlap each other in the radial direction around the axis of the ball screw shaft 32. Thus, in the present embodiment, the separation distance D from the force point of the belt 48 to the fulcrum (center point) of the bearing member 52 can be shortened as compared with the conventional one (see fig. 3). As a result, in the present embodiment, the torsional moment generated in the bearing member 52 by the belt 48 can be reduced, the durability of the bearing member 52 can be improved, and the friction that affects the riding comfort can be reduced. Further, by reducing the torsional moment, the support rigidity of the bearing member 52 can be improved, the inclination of the screw shaft-side pulley 46 can be reduced, and a reduction in durability and an increase in friction of the belt 48 due to the deterioration of the meshing of the belt 48 can be prevented.
In the present embodiment, the screw shaft-side pulley 46 has an extension 56 extending from the center portion toward the outer diameter side. In the present embodiment, by supporting the extension portion 56 by the inner race 64 of the bearing member 52, the inertia generated when the screw shaft-side pulley 46 rotates can be appropriately suppressed.
Next, a suspension device 10a according to another embodiment of the present invention will be described. Note that the same reference numerals are assigned to the same components as those of the suspension device 10 shown in fig. 1 to 3, and detailed description thereof is omitted.
Fig. 4 is a sectional configuration view of a suspension device according to another embodiment of the present invention, fig. 5 is a partially enlarged sectional configuration view of fig. 4, and fig. 6 is a partially enlarged sectional configuration view showing a state in which a ball screw nut is accommodated in a space portion of a screw shaft side pulley.
As shown in fig. 4 and 5, in a suspension device 10a according to another embodiment, the shape of the screw shaft-side pulley 46a and the arrangement position of the bearing member 52 are different from those of the above-described embodiment.
In the suspension device 10a, a space portion 74 is provided radially inward of the bearing member 52, and the ball screw nut 34 can be accommodated in the space portion 74 when the ball screw nut 34 is displaced toward the lower end side (one end side) in the axial direction of the ball screw shaft 32 (see fig. 6). By providing the space portion 74, the stroke amount (displacement amount) S2 of the ball screw nut 34 can be further increased (see fig. 5).
In the suspension device 10a, the belt sliding portion 58 of the screw shaft-side pulley 46a is supported by the outer race 62 of the bearing member 52. This makes it easy to provide the space 74 inside the bearing member 52.
Claims (5)
1. A suspension device characterized by comprising:
an electric motor;
a transmission member that transmits a rotational driving force of the motor;
a pulley connected to an inner side of the transmission member and transmitting a rotational driving force from the transmission member;
a lever member that rotates integrally with the pulley and transmits a rotational driving force from the pulley;
a nut member provided on an outer periphery of the rod member, the nut member being provided so as to be displaceable in an axial direction of the rod member by transmitting a rotational driving force from the rod member; and
a bearing member rotatably supporting the pulley,
the bearing member is located on the inner diameter side of the pulley and is arranged to overlap with the rod member in the radial direction.
2. The suspension device according to claim 1,
the bearing member, the transmission member, and the pulley are disposed at positions that overlap each other in a radial direction around an axis of the rod member.
3. The suspension device according to claim 1 or 2,
a space portion is provided radially inside the bearing member, the space portion being capable of receiving the nut when the nut member is displaced to one end side in the axial direction of the rod member.
4. The suspension device according to claim 1 or 2,
the bearing member has an outer ring, an inner ring, and a plurality of balls capable of rolling between the outer ring and the inner ring,
the pulley is supported by the outer race.
5. The suspension device according to claim 4,
the pulley has an extension extending from the central portion toward the outer diameter side,
the extension is supported by the inner race.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-049198 | 2020-03-19 | ||
| JP2020049198A JP2021146900A (en) | 2020-03-19 | 2020-03-19 | Suspension device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214928801U true CN214928801U (en) | 2021-11-30 |
Family
ID=77850612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120424243.3U Active CN214928801U (en) | 2020-03-19 | 2021-02-26 | Suspension device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2021146900A (en) |
| CN (1) | CN214928801U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114321258A (en) * | 2022-02-10 | 2022-04-12 | 西安华欧精密机械有限责任公司 | Electric variable stroke helical spring type shock absorber |
-
2020
- 2020-03-19 JP JP2020049198A patent/JP2021146900A/en active Pending
-
2021
- 2021-02-26 CN CN202120424243.3U patent/CN214928801U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114321258A (en) * | 2022-02-10 | 2022-04-12 | 西安华欧精密机械有限责任公司 | Electric variable stroke helical spring type shock absorber |
| CN114321258B (en) * | 2022-02-10 | 2024-03-19 | 西安华欧精密机械有限责任公司 | Electric variable stroke spiral spring type shock absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021146900A (en) | 2021-09-27 |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |