阅读说明：本技术 悬架装置 (Suspension device ) 是由 饭野信次 田中佑介 川井洋介 于 2020-05-25 设计创作，主要内容包括：本发明的悬架装置包括：以带状延伸的板弹簧、第一臂、第二臂、以及将第一臂及第二臂旋转自如地连结的连结构件,且所述悬架装置具有保持板弹簧的一端的第一保持部、及保持板弹簧的另一端的第二保持部,第一臂及第二臂在板弹簧的与一端及另一端不同的至少一处支撑板弹簧。(The suspension device of the present invention includes: the suspension device includes a plate spring extending in a band shape, a first arm, a second arm, and a connecting member rotatably connecting the first arm and the second arm, and the suspension device includes a first holding portion holding one end of the plate spring and a second holding portion holding the other end of the plate spring, and the first arm and the second arm support the plate spring at least one position of the plate spring different from the one end and the other end.)

1. A suspension device comprising:

a plate spring extending in a band shape;

a first arm;

a second arm; and

a coupling member that rotatably couples the first arm and the second arm, and the suspension device is characterized by comprising:

a first holding portion that holds one end of the plate spring; and

a second holding portion holding the other end of the plate spring,

the first arm and the second arm support the plate spring at least one position of the plate spring different from one end and the other end.

2. The suspension device according to claim 1,

the support positions of the first arm and the second arm for the plate spring are located between a first coupling position of the first arm and the coupling member and a second coupling position of the second arm and the coupling member.

3. The suspension device according to claim 1 or 2,

the first holding portion is provided to the first arm,

the second holding portion is provided to the second arm.

4. The suspension device according to any one of claims 1 to 3,

the leaf spring comprises a fiber reinforced plastic.

Technical Field

The present invention relates to a suspension device.

Background

Conventionally, there is known a suspension device including: the vehicle is provided with a buffer function for preventing vibration caused by unevenness of a road surface from being transmitted to a vehicle body through wheels, and improves the ride feeling of the vehicle and the stability of operation. A leaf spring (leaf spring) type suspension device is configured using a leaf spring (see, for example, patent document 1).

The leaf springs are mounted on arms (arm) supporting the wheels and cross members (member) supporting the vehicle body. Specifically, the leaf spring is attached to a right arm that supports the right wheel, a left arm that supports the left wheel, and a cross member that supports the vehicle body.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese patent laid-open No. Hei 11-263109

Disclosure of Invention

[ problems to be solved by the invention ]

However, in the conventional suspension device, since the plate spring is attached to the cross member, the vibration from the wheel is transmitted to the vehicle body through the cross member as a transmission path. If the vibration is transmitted to the vehicle body, the quality of the ride feeling and the stability of the steering may be degraded.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a suspension device capable of suppressing transmission of vibration from a wheel to a vehicle body.

[ means for solving problems ]

In order to solve the above problems and achieve the object, a suspension device according to the present invention includes: a plate spring extending in a band shape; a first arm; a second arm; and a coupling member that rotatably couples the first arm and the second arm, and the suspension device is characterized by comprising: a first holding portion that holds one end of the plate spring; and a second holding portion that holds the other end of the plate spring, wherein the first arm and the second arm support the plate spring at least one position of the plate spring different from the one end and the other end.

In the suspension device according to the present invention, the first arm and the second arm support the leaf spring at positions between a first coupling position at which the first arm and the coupling member are coupled and a second coupling position at which the second arm and the coupling member are coupled.

In the suspension device according to the present invention, the first holding portion is provided in the first arm, and the second holding portion is provided in the second arm.

In the suspension device according to the present invention, the leaf spring is made of fiber-reinforced plastic.

[ Effect of the invention ]

According to the present invention, the following effects are exhibited: it is possible to suppress the transmission of vibration from the wheels to the vehicle body.

Drawings

Fig. 1 is a perspective view schematically showing the structure of a suspension device according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.

Fig. 3 is a diagram showing an example of a bending form of a leaf spring of a suspension device according to an embodiment of the present invention.

Fig. 4 is a diagram showing an example of a bending form of a leaf spring of a suspension device according to an embodiment of the present invention.

Fig. 5 is a perspective view schematically showing a main structure of a suspension device according to modification 1 of the embodiment of the present invention.

Fig. 6 is a perspective view schematically showing the configuration of a suspension device according to modification 2 of the embodiment of the present invention.

Fig. 7 is a perspective view schematically showing the configuration of a suspension device according to modification 3 of the embodiment of the present invention.

Fig. 8 is a perspective view schematically showing the structure of a suspension device according to modification 4 of the embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail together with the drawings. The present invention is not limited to the following embodiments. The drawings referred to in the following description schematically show the shape, size, and positional relationship only to the extent that the present invention can be understood. That is, the present invention is not limited to the shapes, sizes, and positional relationships illustrated in the drawings.

(embodiment mode 1)

Fig. 1 is a perspective view schematically showing the structure of a suspension device according to an embodiment of the present invention. Fig. 2 is a cross-sectional view taken along line a-a of fig. 1. The suspension device 1 is provided in a vehicle, for example, and is interposed between a right wheel, a left wheel, and a vehicle body (main body) to suppress transmission of vibration transmitted from the wheels to the vehicle body.

The suspension device 1 includes: a right arm 11 supporting a right wheel; a left arm 12 supporting a left wheel; a cross member 13 supporting the vehicle body; and a leaf spring 14 elastically deformed in accordance with vibration from the wheel. The suspension device 1 is attached to a vehicle body via a cross member 13, and absorbs vibration transmitted from wheels according to irregularities on a road surface. The wheel is supported by an arm via a knuckle (knuckle) or a disc rotor (disc rotor). In fig. 1, the X direction corresponds to the left-right direction of the vehicle when mounted on the vehicle body, the Y direction corresponds to the front-rear direction of the vehicle, and the Z direction corresponds to the up-down direction of the vehicle.

The right arm 11 has: a support portion 11a that supports the right wheel; a supported portion 11b provided on the side of the supporting portion 11a opposite to the wheel supporting side and supported by the cross member 13; a grip 11c extending to the side opposite to the side of the supported portion 11a of the supported portion 11b and gripping a part of the plate spring 14; and a holding portion 11d holding one end of the plate spring 14. The holding portion 11d corresponds to a first holding portion.

The left arm 12 has: a support portion 12a that supports the left wheel; a supported portion 12b provided on the side of the supporting portion 12a opposite to the wheel supporting side and supported by the cross member 13; a grip portion 12c extending to the side opposite to the side of the supported portion 12a of the supported portion 12b and gripping a part of the plate spring 14; and a holding portion 12d holding the other end of the plate spring 14. The holding portion 12d corresponds to a second holding portion.

The cross member 13 supports the vehicle body between the vehicle body and the right wheel, the right arm 11, the left wheel, and the left arm 12. The cross member 13 has: arm support 13a, supporting the right arm 11; an arm support portion 13b that supports the left arm 12; the body portion 13c extends in the X direction (the left-right direction of the vehicle body) and is connected to the right arm 11 and the left arm 12. The arm support portions 13a and 13b extend in a direction (Y direction) perpendicular to the direction (X direction) in which the main body portion 13c extends. The arm support portion 13a surrounds a rotation axis Y extending in the Y direction₁The right arm 11 is rotatably supported. The arm support portion 13b surrounds a rotation axis Y extending in the Y direction₂The left arm 12 is rotatably supported. The cross member 13 corresponds to a connecting member that rotatably connects the right arm 11 and the left arm 12. Further, the cross member 13 may be integrated with the vehicle body. When the cross member 13 is integrated with the vehicle body, the vehicle body functions as a connecting member that connects the right arm 11 and the left arm 12.

The plate spring 14 is band-shaped and extends in the X direction. The plate spring 14 is formed using, for example, Fiber Reinforced Plastic (FRP), metal, or resin. The plate spring may comprise a single sheet of material or a plurality of sheets of material may be stacked. In addition, FRP has a higher degree of freedom in designing the shape, elastic force, and the like of the plate spring 14 than metal or resin.

Here, the holding portions 11d and 12d respectively receive and hold the end portions of the leaf springs 14. In this specification, the following will be referred to as a face support, that is: the housing member partially surrounds the member surface, and holds the member by restricting the movement in the vertical direction (Z direction in this case), the movement in the horizontal direction (Y direction in this case), and the rotational movement. The holding portions 11d and 12d hold the end portions of the leaf springs 14 by surface support. Further, the leaf spring 14 is movable in a direction of insertion into or removal from the holding portion 11d or the holding portion 12 d.

Further, in the grip portion 11c, projections 11e are formed on two grip surfaces facing each other as surfaces of the grip leaf spring 14. The grip 11c holds and supports the plate spring 14 by the projection 11 e. In this specification, the following case will be referred to as point support, that is: a part of the member is supported in a point or a line by a protrusion or the like. In the case of the point support, the plate spring 14 is supported in an area of a rotatable degree with the projection 12e as a fulcrum. The grip portion 11c supports the plate spring 14 by point support. On the other hand, in the case of the surface support, the plate spring 14 is in a state of being unable to rotate due to the holding portion 11d and the holding portion 12d even if a load is applied from the arm.

Further, in the grip portion 12c, projections 12e are formed on two grip surfaces facing each other as surfaces of the grip leaf spring 14. The grip portion 12c point-supports the plate spring 14 by the protrusion 12 e.

The holding portion 11c (projection 11e) supports the plate spring 14 at a position (rotation axis Y) where the right arm 11 and the cross member 13 are connected to each other₁) Further to the inner side (the side opposite to the right wheel side). The holding portion 12c (projection 12e) supports the plate spring 14 at a position (rotation axis Y) where the left arm 12 and the cross member 13 are connected to each other₂) Further to the inner side (the side opposite to the left wheel side). The position of the grip portion 11c supporting the plate spring 14 and the position of the grip portion 12c supporting the plate spring 14 are both located on the rotation axis Y₁And the axis of rotation Y₂In the meantime.

Fig. 3 and 4 are views showing an example of a bending form of a leaf spring of a suspension device according to an embodiment of the present invention. Fig. 3 is a diagram showing a state in which the leaf spring 14 is deformed by displacement of the arm. Fig. 4 is a view showing a state of being bent in a reverse manner to fig. 3. As shown in fig. 3 and 4, even when the leaf spring 14 is deformed by the displacement of the arm, the cross beam 13 is not affected by the deformation. In the suspension device 1, even if the leaf spring 14 is deformed, the cross beam 13 is not deformed. That is, in the suspension device 1, in the case where vibration is transmitted from the arm to the leaf spring 14, the leaf spring 14 absorbs the vibration and does not transmit the vibration to the cross beam 13. At this time, the right arm 11 and the left arm 12 are rotatably supported by the cross member 13, and the load due to the fluctuation is converted into a rotational force, thereby suppressing the transmission of the vibration of the arms to the cross member 13.

In the embodiment described above, the plate spring 14 is supported by the right arm 11 and the left arm 12, the plate spring 14 absorbs the vibration transmitted by the displacement of the arms, and the vibration due to the deformation (displacement) of the plate spring 14 is not directly transmitted to the cross member 13, so that the transmission of the vibration from the wheels to the vehicle body can be suppressed. In the suspension device 1, for example, when the vehicle body tilts (rolls over) and one of the wheels is displaced upward (toward the vehicle body side) and the other wheel is displaced to the opposite side (opposite side in the Z direction in this case), the plate spring 14 deforms or tries to return to the original shape, thereby suppressing the inclination (roll angle) of the vehicle body.

In the embodiment, the plate spring 14 is disposed in the region where the arm is disposed, and therefore, the disposition space of the plate spring 14 can be made efficient.

(modification 1 of embodiment)

Fig. 5 is a perspective view schematically showing a main structure of a suspension device according to modification 1 of the embodiment of the present invention. In the above embodiment, the example in which the holding portion 11d holds the plate spring 14 by surface support has been described, but in modification 1, the holding portion holds the plate spring 14 by point support. In modification 1, the structure of the right arm holding portion is the same as that of the above embodiment except for the structure. The structure of the right arm holding portion 11f will be described below.

The holding portion 11f holds one end of the plate spring 14. The holding portion 11f receives and holds an end portion of the plate spring 14. The holding portion 11f has protrusions 11g formed on two surfaces facing each other, which are surfaces for accommodating the leaf springs 14. The holding portion 11f supports the plate spring 14 by point support.

Even in the case where the holding portion 11f of the right arm point-supports the plate spring 14 as in modification 1 described above, the vibration is not transmitted to the cross member 13 by the deformation (displacement) of the plate spring 14, and thus the transmission of the vibration from the wheels to the vehicle body can be suppressed.

The holding portion provided in the left arm may be configured to support the plate spring 14 at a point. The plate spring 14 may be surface-supported by the grip portion 11c and the grip portion 12 c. In the case of the point support and the surface support, the spring constant of the plate spring 14 changes even if the support position is the same. The support configuration may also be changed to adjust the spring constant of the leaf spring 14. In addition to the surface support and the point support, a hinge support structure that allows rotation in accordance with movement of the leaf spring 14 may be provided.

(modification 2 of embodiment)

Fig. 6 is a perspective view schematically showing the configuration of a suspension device according to modification 2 of the embodiment of the present invention. The suspension device 1A of modification 2 includes: a right arm 11A supporting a right wheel; a left arm 12A supporting a left wheel; a cross member 13 supporting the vehicle body; a leaf spring 14 elastically deformed in accordance with vibration from the wheel; and a grip portion 15 for gripping the plate spring 14. The cross beam 13 and the leaf spring 14 have the same structure as in the embodiment, and therefore, the description thereof is omitted.

The right arm 11A has: a support portion 11a that supports the right wheel; a supported portion 11b provided on the side of the supporting portion 11a opposite to the wheel supporting side and supported by the cross member 13; a holding portion 11d that holds one end of the leaf spring 14 (see fig. 2); and a connecting portion 11h extending to the side of the supported portion 11b opposite to the side of the supporting portion 11a and connected to the grip portion 15.

The left arm 12A has: a support portion 12a that supports the left wheel; a supported portion 12b provided on the side of the supporting portion 12a opposite to the wheel supporting side and supported by the cross member 13; a holding portion 12d for holding the other end of the leaf spring 14 (see fig. 2); and a connecting portion 12f extending to the side of the supported portion 12b opposite to the supporting portion 12a side and connected to the grip portion 15.

The grip portion 15 is annular and grips the central portion of the leaf spring 14 in the longitudinal direction. The holding portion 15 is supported by the plate spring 14 at a position (rotation axis Y) where the right arm 11A and the cross member 13 are connected to each other₁) And the position (rotation axis Y) connected to the left arm 12A and the cross member 13₂) In the meantime.

The coupling portions 11h and 12f are coupled to different positions of the grip portion 15. The right arm 11A grips the leaf spring 14 via the coupling portion 11h by the grip portion 15. The left arm 12A grips the leaf spring 14 via the coupling portion 12f by the grip portion 15. The right arm 11A and the left arm 12A support the plate spring through a common grip portion 15. In modification 2, a bearing or the like may be provided between the grip 15 and at least one of the right arm 11 and the left arm 12, and the right arm 11 and the left arm 12 may be rotated independently of the grip 15.

In the suspension device 1A, also in the case where vibration is transmitted from the arm to the leaf spring 14, the leaf spring 14 absorbs the vibration and does not transmit the vibration to the cross beam 13.

In modification 2 described above, the plate spring 14 is supported by the right arm 11A and the left arm 12A, and the plate spring 14 absorbs the vibration transmitted by the displacement of the arms and does not transmit the vibration due to the deformation (displacement) of the plate spring 14 to the cross member 13, so that the transmission of the vibration from the wheels to the vehicle body can be suppressed.

(modification 3 of the embodiment)

Fig. 7 is a perspective view schematically showing the configuration of a suspension device according to modification 3 of the embodiment of the present invention. In the above-described embodiment, and modifications 1 and 2, examples of the arm holding plate spring have been described, but in modification 3, the links (the first link 16 and the second link 17) connected to the arms 11 and 12 hold the plate spring. A suspension device 1B of modification 3 includes: a right arm 11 supporting a right wheel; a left arm 12 supporting a left wheel; a cross member 13 supporting the vehicle body; a leaf spring 14 elastically deformed in accordance with vibration from the wheel; a first link 16 holding one end of the leaf spring 14 and connected to the right arm 11; and a second link 17 for holding the other end of the leaf spring 14 and connected to the left arm 12. In modification 3, the configuration of the link is the same as that of the above-described embodiment, except that the right arm 11 and the left arm 12 do not have the holding portion 11d and the holding portion 12 d. The following describes the structure of the first link 16 and the second link 17.

The first link 16 has: a holding portion 16a that holds one end of the leaf spring 14; and a connecting portion 16b connected to the right arm 11. The holding portion 16a is rotatably supported by the connecting portion 16b about an axis parallel to the Y direction. The holding portion 16a is supported by the connecting portion 16b by a pin (pin) or a ball joint (ball joint), for example. The connecting portion 16b is rotatably supported by the right arm 11 about an axis parallel to the Y direction. The connecting portion 16b is supported to the right arm 11 by a pin or a ball joint, for example. The holding portion 16a corresponds to a first holding portion.

The second link 17 has: a holding portion 17a that holds the other end of the leaf spring 14; and a connecting portion 17b connected to the left arm 12. The holding portion 17a is rotatably supported by the connecting portion 17b about an axis parallel to the Y direction. The holding portion 17a is supported by the connecting portion 17b by a pin or a ball joint, for example. The connecting portion 17b is rotatably supported by the left arm 12 about an axis parallel to the Y direction. The connecting portion 17b is supported by the left arm 12, for example, by a pin or a ball joint. The holding portion 17a corresponds to a second holding portion.

In fig. 7, the first link 16 and the second link 17 support the plate spring 14 by surface support, respectively, but the plate spring 14 may be supported by point support.

Even in the case where the plate spring 14 is held by the link connected to each arm as in modification 3 described above, the vibration is not transmitted to the cross member 13 by the deformation (displacement) of the plate spring 14, and thus the transmission of the vibration from the wheel to the vehicle body can be suppressed.

(modification 4 of the embodiment)

Fig. 8 is a perspective view schematically showing the structure of a suspension device according to modification 4 of the embodiment of the present invention. In modification 4, a knuckle holding plate spring is interposed between the wheel and the arm and supports the bearing. A suspension device 1C of modification 3 includes: a right arm 11 supporting a right wheel; a left arm 12 supporting a left wheel; a cross member 13 supporting the vehicle body; a leaf spring 14 elastically deformed in accordance with vibration from the wheel; a first knuckle 18 holding one end of the leaf spring 14 and connected to the right arm 11; and a second knuckle 19, which holds the other end of the leaf spring 14, and is connected to the left arm 12. In modification 4, the structure of the knuckle is the same as that of the above-described embodiment, except that the right arm 11 and the left arm 12 do not have the holding portion 11d and the holding portion 12 d. The following describes the structure of the first knuckle 18 and the second knuckle 19.

The first knuckle 18 has: a holding portion 18a that holds one end of the leaf spring 14; and a connecting portion 18b supporting the bearing and connected to the right arm 11. The holding portion 18a is rotatably supported by the connecting portion 18b about an axis parallel to the Y direction. The holding portion 18a is supported by the connecting portion 18b by a pin or a ball joint, for example. The connecting portion 18b is rotatably supported on the right arm 11 about an axis parallel to the Y direction. The connecting portion 18b is supported to the right arm 11 by a pin or a ball joint, for example. The holding portion 18a corresponds to a first holding portion.

The second knuckle 19 has: a holding portion 19a that holds the other end of the leaf spring 14; and a connecting portion 19b that supports the bearing and is connected to the left arm 12. The holding portion 19a is rotatably supported by the connecting portion 19b about an axis parallel to the Y direction. The holding portion 19a is supported by the connecting portion 19b by a pin or a ball joint, for example. The connecting portion 19b is rotatably supported by the left arm 12 about an axis parallel to the Y direction. The connecting portion 19b is supported by the left arm 12, for example, by a pin or a ball joint. The holding portion 19a corresponds to a second holding portion.

In fig. 8, the first knuckle 18 and the second knuckle 19 support the plate spring 14 by surface support, respectively, but the plate spring 14 may be supported by point support.

Even in the case where the leaf spring 14 is held by the knuckle connected to each arm as in modification 4 described above, the vibration is not transmitted to the cross member 13 by the deformation (displacement) of the leaf spring 14, and thus the transmission of the vibration from the wheel to the vehicle body can be suppressed.

As in modification 3 and modification 4, the following configuration may be adopted: the member separate from the arm and provided between the vehicle body and the wheel in connection with the connection of both holds the plate spring. In modification 3 and modification 4, the support positions of the plate springs 14 by the right and left arms may be the positions of modification 2.

The embodiments of the present invention have been described above, but the present invention should not be limited to only the embodiments. As described above, the present invention may include various embodiments and the like not described herein, and various design changes and the like may be implemented without departing from the scope of the technical idea specified in the claims.

In the above-described embodiment and modification, a cushioning member such as rubber may be disposed at a portion of the arm that contacts the plate spring, and the plate spring may be supported via the cushioning member.

In the above-described embodiment and modification, the example in which the plate spring is held between the connecting position of the right arm and the cross member and the connecting position of the left arm and the cross member has been described, but the plate spring may be supported at a position overlapping the connecting position as viewed from the Z direction, or the plate spring may be supported on the wheel side (outer side) of the connecting position.

In the above embodiment and modification, the following configuration may be adopted: the holding portion can be moved to the holding position of the plate spring 14 by an actuator or the like.

In the above-described embodiment and modification, the support plate spring may be configured to support a plurality of five or more positions.

The suspension device according to the above-described embodiment and the modified examples may be provided in a vehicle in combination with other suspension devices such as a suspension device using a coil spring.

[ Industrial availability ]

As described above, the suspension device of the present invention is suitable for suppressing transmission of vibration from the wheel to the vehicle body.

[ description of symbols ]

1. 1A to 1C: suspension device

11. 11A: right arm

11a, 12 a: supporting part

11b, 12 b: supported part

11c, 12c, 15: gripping part

11d, 11f, 12 d: holding part

11e, 11g, 12 e: protrusion

12. 12A: left arm

13: cross beam

13a, 13 b: arm support

13 c: body part

14: plate spring

15: gripping part

16: first connecting rod

17: second connecting rod

18: first steering knuckle

19: second knuckle