JP2019089371A - Tire-fitted suspension device - Google Patents

Abstract

To provide a tire-fitted suspension device, wherein, even when fitted with a tire having a sufficiently reduced weight, a specific vibration from the tire is prevented from transmitting to a vehicle body.SOLUTION: An elastic body 23c of a first rear side bush 23 has a kinetic spring constant smaller than a kinetic spring constant of an elastic body 25c of a second rear side bush 25, and a tire T satisfies the following formula: W/[{(R/2)-(r/2)}×3.14×H]≤1.8×10, where weight is W (kg), sectional width is H (mm), tire outer diameter is R (mm), and application rim diameter is r (mm).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tire provided with a tire, a front side support device disposed on the front side of the vehicle and rotatably supporting the tire, and a rear side support device disposed on the vehicle rear side and rotatably supporting the tire. The present invention relates to a suspension system.

  Conventionally, for example, as described in Patent Document 1 below, a tire whose weight has been reduced is known, but in recent years, further weight reduction of the tire is required.

JP, 2015-13557, A

  However, when a tire whose weight is sufficiently reduced is attached to a suspension system of a vehicle, a specific vibration that has been damped and absorbed by the conventional tire is transmitted to the vehicle body during running, which may cause an occupant to sense abnormal noise. I found that there is.

  The present invention has been made in view of the above-mentioned circumstances, and a suspension system with a tire capable of suppressing transmission of a specific vibration from the tire to a vehicle body even when the tire whose weight is sufficiently reduced is mounted. Intended to provide.

In order to solve the above-mentioned subject, the present invention proposes the following means.
The tire suspension system according to the present invention includes a tire, a front side support device disposed on the front side of the vehicle and rotatably supporting the tire, and a rear side disposed on the rear side of the vehicle and rotatably supporting the tire. And a supporting device for supporting the tire, wherein the rear supporting device includes a rear supporting member rotatably supporting the tire, and a front-rear direction in which a rear end is connected to the rear supporting member. And a first rear bush connecting the front end of the trailing arm to the vehicle body, a rear arm connected to the rear support member, and a rear arm connecting the rear arm to the vehicle body 2 rear side bush, rear side mount disposed above the tire and attached to the vehicle body, rod whose upper end is attached to the rear side mount, and lower end are the tray A rear shock absorber having a cylinder attached to the ring arm, wherein a central axis of the first rear bush extends in the lateral direction of the vehicle, and a central axis of the second rear bush extends in the longitudinal direction of the vehicle The dynamic spring constant of the elastic body of the first rear side bush is smaller than the dynamic spring constant of the elastic body of the second rear side bush, and the tire has a weight of W (kg) and a sectional width of H (H When the tire outer diameter is R (mm) and the applicable rim diameter is r (mm), the following equation is satisfied.
W / [{(R / 2) ^2- (r / 2) ² } × 3.14 × H] ≦ 1.8 × 10 ⁻⁷

According to the present invention, even if a specific vibration that has conventionally been damped and absorbed by the tire due to the lightweight tire satisfying the above equation is transmitted to the trailing arm via the rear side support member, This vibration can be damped and absorbed by the elastic body of the first rear side bush, whose dynamic spring constant is smaller than the dynamic spring constant of the elastic body of the second rear side bush, and this vibration can be transmitted to the vehicle body Transmission can be suppressed.
In particular, the dynamic spring constant of the elastic body of the first rear side bush, which the central axis extends in the lateral direction of the vehicle, mainly damps and absorbs the vibration in the longitudinal direction of the vehicle, is the dynamic state of the elastic body of the second rear side bush Since it is smaller than the spring constant, it is possible to damp the vibration in the front and back direction surely even though large acceleration in the front and back direction is easily applied to the tire at the time of acceleration and deceleration of traveling due to the lightweight tire satisfying the above equation. Can be absorbed, and good ride comfort can be ensured.

  Here, the front side support device includes a front side support member rotatably supporting the tire, a front side arm connected to the front side support member, and a first front side connecting the front side arm to the vehicle body A front with a side bush, a front side mount disposed above the tire and attached to a vehicle body, a rod whose upper end is attached to the front side mount, and a cylinder whose lower end is attached to the front side support member A second front bush that connects a side shock absorber, a portion of the front arm located on the rear side of the vehicle with respect to a connecting portion with the first front bush, and a vehicle body; (1) The central axis of the front bush extends in the longitudinal direction of the vehicle, and the central axis of the second front bush It extends vertically, the dynamic spring constant of the elastic body of the second front-side bush may be smaller than the dynamic spring constant of the elastic body of the first front-side bush.

In this case, since the second front side bush which is disposed on the rear side of the vehicle from the first front side bush and whose central axis extends in the vertical direction is provided, for example, when the vertical vibration is input to the tire, the second front side bush is It becomes possible to deform the elastic body of the front side bush in the front-rear direction and the like, and the ride comfort can be improved.
In particular, since the dynamic spring constant of the elastic body of the second front side bush is smaller than the dynamic spring constant of the elastic body of the first front side bush, it is not damped and absorbed by the tire, but transmitted to the front side arm The vibration can be damped and absorbed by the elastic body of the second front bush, and the transmission of the vibration to the vehicle body can be reliably suppressed.

  According to the present invention, even when a tire whose weight is sufficiently reduced is mounted, transmission of specific vibrations from the tire to the vehicle body can be suppressed.

1 is a schematic view of a front supporting device of a suspension with a tire according to an embodiment of the present invention, including a partial cross section, as viewed from the left and right direction of a vehicle. It is a perspective view showing an outline of a rear side support device of a suspension with a tire concerning one embodiment of the present invention. It is a graph explaining a lightweight tire.

Hereinafter, an embodiment of a suspension system with a tire according to the present invention will be described based on FIG. 1 and FIG.
The tire suspension system 1 includes a tire T, a front side support device 10 disposed on the vehicle front side F and rotatably supporting the tire T, and a rear member disposed on the vehicle rear R and rotatably supporting the tire T. And a side support device 20. The tire suspension system 1 is used as a four-wheel automobile.

  As shown in FIG. 1, the front side support device 10 includes a front side support member 11 rotatably supporting a tire T, and a front side lower arm (front side arm) 12 connected to the front side support member 11. The first front side bush 13 connecting the front lower arm 12 to the vehicle body, the front side upper mount (front side mount) 14 disposed above the tire T and attached to the vehicle body, and the front end upper mount 14 And a front side shock absorber 15 having a cylinder 15 b whose lower end is mounted to the front side support member 11.

The front lower arm 12 is connected to the front support member 11 via, for example, a ball joint or the like, and is swingably supported by the front support member 11. The front side lower arm 12 is formed in a plate shape in which the front and back surfaces face vertically.
The first front bush 13 includes an inner cylinder 13a, an outer cylinder 13b having the inner cylinder 13a disposed inside, and an elastic body 13c connecting an outer peripheral surface of the inner cylinder 13a and an inner peripheral surface of the outer cylinder 13b. And. The central axis O1 of the first front bush 13 extends in the longitudinal direction of the vehicle. The first front bush 13 is disposed inward of the tire T in the left-right direction of the vehicle. The first front bush 13 is connected to, for example, a support member of a vehicle body.

  In the illustrated example, the front side support device 10 is a second front side that connects the vehicle body to a portion of the front side lower arm 12 that is located on the vehicle rear side R from the connection portion with the first front side bush 13 The bush 19 is provided. The second front bush 19 includes an inner cylinder 19a, an outer cylinder 19b having the inner cylinder 19a disposed therein, and an elastic body 19c connecting an outer peripheral surface of the inner cylinder 19a and an inner peripheral surface of the outer cylinder 19b. And. The central axis O2 of the second front bush 19 extends in the vertical direction. The second front bush 19 is disposed on the vehicle rear side R more than the tire T. The second front bush 19 is disposed inward of the tire T in the left-right direction of the vehicle. The second front bush 19 is connected to, for example, a support member of a vehicle body. The positions of the second front bush 19 and the first front bush 13 in the vertical direction are equal to each other.

  The front upper mount 14 includes an inner cylindrical member 14a to which the upper end portion of the rod 15a of the front shock absorber 15 is inserted and fixed inside, and an outer cylindrical member 14b surrounding the inner cylindrical member 14a from the outside in the radial direction. The elastic body 14c which connects the inner cylinder member 14a and the outer cylinder member 14b is provided. The front-to-back distance between the front upper mount 14 and the first front bush 13 is shorter than the front-to-back distance between the front upper mount 14 and the second front bush 19.

  In the example of illustration, the front side support apparatus 10 is equipped with the coil spring 16 by which the front side shock absorber 15 was penetrated inside. An upper end portion of the coil spring 16 is supported by a seat bracket 17 attached to the front upper mount 14. The lower end portion of the coil spring 16 is supported by a receiving portion 18 attached to the cylinder 15 b of the front side shock absorber 15.

  As shown in FIG. 2, the rear side support device 20 includes a rear side support member 21 rotatably supporting the tire T, and a trailing arm extending in the front-rear direction with its rear end portion connected to the rear side support member 21. 22, a first rear bush 23 for connecting the front end of the trailing arm 22 to the vehicle body, a rear lower arm (rear arm) 24 connected to the rear support member 21, and a rear lower arm 24 as a vehicle body A second rear side bush 25 to be connected, a rear upper mount (rear side mount) 26 disposed above the tire T and mounted to the vehicle body, a rod whose upper end is mounted to the rear upper mount 26, and a lower end And a rear shock absorber 27 having a cylinder 27 b attached to the rear end of the trailing arm 22.

The first rear side bush 23 includes an inner cylinder 23a, an outer cylinder 23b on the inner side of the inner cylinder 23a, and an elastic body 23c connecting an outer peripheral surface of the inner cylinder 23a and an inner peripheral surface of the outer cylinder 23b. And. The central axis O3 of the first rear bush 23 extends in the lateral direction of the vehicle. The first rear side bush 23 is disposed inward of the tire T in the left-right direction of the vehicle. The first rear side bush 23 is disposed on the vehicle front side F from the tire T.
The rear side lower arm 24 is disposed on the vehicle rear side R with respect to the first rear side bush 23 and on the vehicle front side F with respect to the rear side shock absorber 27. The rear lower arm 24 is swingably supported by the rear support member 21. The rear lower arm 24 extends from the rear support member 21 inward in the left-right direction of the vehicle.

The second rear bush 25 is connected to an inner end of the rear lower arm 24 in the left-right direction of the vehicle. The second rear side bush 25 includes an inner cylinder 25a, an outer cylinder 25b on the inner side of the inner cylinder 25a, and an elastic body 25c connecting an outer peripheral surface of the inner cylinder 25a and an inner peripheral surface of the outer cylinder 25b. And. The central axis O4 of the second rear bush 25 extends in the longitudinal direction of the vehicle. The second rear bush 25 is disposed inward of the tire T in the left-right direction of the vehicle.
The rear upper mount 26 has an inner cylindrical member to which the upper end portion of the rod of the rear shock absorber 27 is inserted and fixed inside, an outer cylindrical member surrounding the inner cylindrical member from the outer side in the radial direction, and an inner cylindrical member And an elastic body c connecting the outer cylinder member.

  In the illustrated example, the rear side support device 20 has a coil spring 28 whose lower end is connected to the trailing arm 22 and whose upper end is connected to the vehicle body, and an upper arm 29 connected to the rear side support member 21. And an upper bush 31 connecting the upper arm 29 to the vehicle body.

The coil spring 28 is disposed on the vehicle rear side R with respect to the first rear side bush 23 and on the vehicle front side F with respect to the rear side lower arm 24 and the upper arm 29.
The upper arm 29 is disposed above the rear lower arm 24 and vertically opposed to the rear lower arm 24. The upper arm 29 is swingably supported by the rear side support member 21. The upper arm 29 extends from the rear side support member 21 inward in the left-right direction of the vehicle.
The upper bush 31 is connected to an inner end portion of the upper arm 29 in the left-right direction of the vehicle. The upper bush 31 includes an inner cylinder 31a, an outer cylinder 31b on the inner side of the inner cylinder 31a, and an elastic body 31c connecting an outer peripheral surface of the inner cylinder 31a and an inner peripheral surface of the outer cylinder 31b. . The central axis O5 of the upper bush 31 extends in the longitudinal direction of the vehicle. The upper bush 31 is disposed inward of the tire T in the left-right direction of the vehicle.

  Further, in the present embodiment, the dynamic spring constant of the elastic body 23c of the first rear side bush 23 is smaller than the dynamic spring constant of the elastic body 25c of the second rear side bush 25. The respective volumes of the elastic body 23 c of the first rear side bush 23 and the elastic body 25 c of the second rear side bush 25 are equal to each other.

  The dynamic spring constants of the elastic body 25c of the second rear side bush 25 and the elastic body 13c of the first front side bush 13 are equal to each other. The respective volumes of the elastic body 25 c of the second rear side bush 25 and the elastic body 13 c of the first front side bush 13 are equal to each other.

  The dynamic spring constant of the elastic body 14 c of the front upper mount 14 shown in FIG. 1 is smaller than the dynamic spring constant of the elastic body 13 c of the first front bush 13. The dynamic spring constant of the elastic body 14 c of the front upper mount 14 may be equal to or greater than the dynamic spring constant of the elastic body 13 c of the first front bush 13. The volume of the elastic body 14 c of the front side upper mount 14 is larger than the volume of the elastic body 13 c of the first front side bush 13.

  The dynamic spring constant of the elastic body 19 c of the second front bush 19 is smaller than the dynamic spring constant of the elastic body 13 c of the first front bush 13. The dynamic spring constant of the elastic body 19 c of the second front bush 19 may be equal to or greater than the dynamic spring constant of the elastic body 13 c of the first front bush 13. The respective volumes of the elastic body 19c of the second front bush 19 and the elastic body 13c of the first front bush 13 are equal to each other.

  Here, the dynamic spring constant Kd is a method specified in 6.1.1 “case of load waveform, deflection waveform” of 6.1 “non-resonance method” in Japan Rubber Association Standard (SRIS) 3503-1990. It can be measured by For measurement conditions (SRIS 3503-1990 4.3 “designated conditions for test”), the test temperature corresponds to the usage environment of the applied vehicle, the test frequency is around the unsprung resonance frequency of the applied vehicle, and the average load is The load amplitude can be used as a condition for use in an applied vehicle, corresponding to the load of a spring 1G of the applied vehicle.

The weight of each tire T is lighter than that of the conventional tire. Specifically, when the tire T has a weight of W (kg), a cross-sectional width of H (mm), a tire outer diameter of R (mm), and an applicable rim diameter of r (mm), Fulfill.
W / [{(R / 2) ^2- (r / 2) ² } × 3.14 × H] ≦ 1.8 × 10 ⁻⁷

  Among these, the cross-sectional width, the tire outer diameter, and the applied rim diameter are obtained from the size notation of the JATMA definition engraved on the sidewall portion of the tire T. For example, if the size notation is "195/65 R 15 91H", the cross-sectional width is 195 mm, the tire outer diameter is 634.5 mm (195 mm x 0.65 x 2 + 15 inches x 25.4), and the applicable rim diameter is 381 mm It will be (15 inches × 25.4). The cross-sectional width is the width of the tire T excluding the projecting patterns, characters and the like engraved on the sidewall portion of the tire T, and the applicable rim diameter is the same as the inner diameter of the tire T.

The graph which plotted the weight and the calculated value obtained by substituting numerical values, such as weight, into said Formula is shown in FIG. 3 about several types of passenger car tires. In this figure, the straight line shows that the value obtained from the above equation is 1.8 × 10 ⁻⁷ , and in FIG. 3 the conventional tire is distributed in the region above this straight line, the lower side The lightweight tire T according to the present embodiment is distributed in the area of.

As described above, according to the suspension system 1 with tire according to the present embodiment, due to the lightweight tire T satisfying the above equation, the specific vibration conventionally damped and absorbed by the tire is on the rear side. Even if the vibration is transmitted to the trailing arm 22 via the support member 21, this vibration is the first rear side bush 23 whose dynamic spring constant is smaller than the dynamic spring constant of the elastic body 25 c of the second rear side bush 25. The elastic body 23c enables damping and absorption, and transmission of this vibration to the vehicle body can be suppressed.
In particular, the dynamic spring constant of the elastic body 23c of the first rear side bush 23, which has the central axis O3 extending in the left-right direction of the vehicle and mainly damps and absorbs vibrations in the vehicle longitudinal direction, is the elasticity of the second rear side bush 25 Since it is smaller than the dynamic spring constant of the body 25c, it is easy to apply a large acceleration in the front-rear direction to the tire T during acceleration / deceleration of traveling due to the lightweight tire T satisfying the above equation. Vibration in the direction can be reliably damped and absorbed, and good ride comfort can be ensured.

Further, since the second front side bush 19 which is disposed on the vehicle rear side R from the first front side bush 13 and the central axis O2 extends in the vertical direction is provided, for example, when vibration in the vertical direction is input to the tire T In addition, it is possible to deform the elastic body 19c of the second front bush 19 in the front-rear direction, etc., and to improve ride comfort.
In particular, since the dynamic spring constant of the elastic body 19c of the second front bush 19 is smaller than the dynamic spring constant of the elastic body 13c of the first front bush 13, it is not damped and absorbed by the tire T, and the front lower arm The specific vibration transmitted to 12 can be damped and absorbed by the elastic body 19 c of the second front bush 19, and the transmission of the vibration to the vehicle body can be reliably suppressed.

  Further, even if specific vibrations that are conventionally damped and absorbed by the tire are transmitted to the front side shock absorber 15 through the front side support member 11 due to the lightweight tire T satisfying the above equation. The rod 15a of the front side shock absorber 15 is attached to this vibration, and the elastic spring 14c of the front side upper mount 14 has a dynamic spring constant smaller than that of the elastic body 13c of the first front bush 13 Can be damped and absorbed, and this vibration can be suppressed from being transmitted to the vehicle body.

  Further, the dynamic spring constant of the elastic body 13c of the first front side bush 13 that the central axis O1 extends in the longitudinal direction of the vehicle and mainly damps and absorbs the vibration in the lateral direction of the vehicle is the elasticity of the front side upper mount 14. Since the dynamic spring constant of the first front side bush 13 is larger than the dynamic spring constant of the body 14c and the dynamic spring constant of the elastic body 13c of the first front side bush 13 is secured, the operation and effect described above can be achieved. It can prevent the stability from being affected.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

For example, the front support device 10 may not include the second front bush 19.
For example, the arrangement positions of the coil spring 28 and the upper arm 29 of the rear side support device 20 are not limited to the above embodiment, and may be changed as appropriate.

  In addition, it is possible to replace components in the embodiment with known components as appropriate without departing from the spirit of the present invention, and the above-described modifications may be combined as appropriate.

1 Suspension with tire 10 Front side support device 11 Front side support member 12 Front side lower arm (front side arm)
13 first front side bush 13 c elastic body of the first front side bush 14 front side upper mount (front side mount)
15 front side shock absorber 15a rod 15b, 27b cylinder 19 second front side bush 19c elastic body of second front side bush 20 rear side support device 21 rear side support member 22 trailing arm 23 first rear side bush 23c first rear side Elastic body on the side bush 24 Rear side lower arm (rear side arm)
25 Second rear side bush 25c Elastic body of second rear side bush 26 Rear upper mount (rear side mount)
27 Rear shock absorber F Vehicle front R Vehicle rear T tire

Claims (2)

With the tires,
A front support device disposed on the front side of the vehicle and rotatably supporting the tire;
And a rear suspension device disposed on the rear side of the vehicle and rotatably supporting the tire.
The rear side support device is
A rear side support member rotatably supporting the tire;
A longitudinally extending trailing arm having a rear end portion connected to the rear side support member;
A first rear bush connecting the front end of the trailing arm to the vehicle body;
A rear arm connected to the rear support member;
A second rear bush connecting the rear arm to the vehicle body;
A rear mount disposed above the tire and mounted to a vehicle body;
A rear shock absorber having a rod whose upper end is attached to the rear mount and a cylinder whose lower end is attached to the trailing arm;
The central axis of the first rear bush extends in the lateral direction of the vehicle,
The central axis of the second rear bush extends in the longitudinal direction of the vehicle,
The dynamic spring constant of the elastic body of the first rear side bush is smaller than the dynamic spring constant of the elastic body of the second rear side bush,
The tire satisfies the following formula when the weight is W (kg), the section width is H (mm), the tire outer diameter is R (mm), and the applicable rim diameter is r (mm). Suspension system with tires.
W / [{(R / 2) ^2- (r / 2) ² } × 3.14 × H] ≦ 1.8 × 10 ⁻⁷ The front side support device is
A front side support member rotatably supporting the tire;
A front arm connected to the front support member;
A first front bush connecting the front arm to the vehicle body;
A front side mount disposed above the tire and mounted to a vehicle body;
A front side shock absorber having a rod whose upper end is attached to the front side mount, and a cylinder whose lower end is attached to the front side support member;
The front side arm includes a second front side bush that connects the vehicle body with a portion located on the vehicle rear side with respect to a connection portion with the first front side bush,
The central axis of the first front bush extends in the longitudinal direction of the vehicle,
The central axis of the second front bush extends vertically.
The tire suspension system according to claim 1, wherein a dynamic spring constant of the elastic body of the second front bush is smaller than a dynamic spring constant of the elastic body of the first front bush.

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