JPH04112102U - car rear suspension - Google Patents

Abstract

(57) [Summary] [Purpose] By supporting the axle beam without installing a lateral rod, a suspension arm that does not limit the tire storage space due to the lateral rod and improves vibration and noise characteristics. provide. [Structure] A pair of boss portions are provided at the front ends of each left and right arm portion and are located apart in the vehicle width direction, and these boss portions are pivotally supported via rubber bushings on a support shaft on the vehicle body side with a set sweep angle. On the other hand, the axle beam is connected to the left and right arm portions via an elastic member.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a rear suspension for an automobile.

0002

[Conventional technology]

A suspension is installed between the car body and the wheels. tion has a significant impact on the ride comfort and driving performance of an automobile. For example, in the case of a torsion beam rear suspension as shown in Figure 5, Attach boss parts c and c to the front ends of left and right arm parts b and b of suspension arm a. Each boss part c, c is attached to a cylindrical rubber bush (not shown) on the support shaft d, d on the vehicle body side. The suspension arm a is connected to the vehicle body by being supported via the are doing. In addition, the left and right arm parts b, They are connected via a beam e.

0003 The above torsion beam type rear suspension has the above torsion beam e on the left. Rigidity in the vehicle width direction can be increased by providing the right arm parts b and b in a spanning manner. Moreover, since the above torsion beam functions as a stabilizer, driving safety is improved. Qualitativeness can be improved.

0004

[Problem that the idea aims to solve]

By the way, the above-mentioned stabilizer effect is achieved by The torsion beam e functions as a so-called torsion spring, and the left and right arm parts Torsional rebound that occurs when b and b are elastically torsionally deformed by vertical movement The force is exerted by adjusting the vertical movement of the left and right arm portions b, b. However, the arms b, b and both ends of the torsion beam e are welded together. When the torsion beam e is twisted, these connections Stress tends to concentrate at joints, which can cause cracks and other problems in strength. stomach. Therefore, high welding accuracy must be maintained to ensure joint strength. Therefore, it was difficult to rationalize the assembly work.

[0005] As a solution to the above problem, it is described in Japanese Utility Model Application Publication No. 150806/1983. As shown in the figure, there is a A bracket consisting of a pair of parallel plates extending in the direction is provided, and the rear of each arm is Connect the boss provided at the end to the support shaft supported by each of the above brackets via a rubber bush. A suspension structure in which the vehicle is supported by a mantle has been proposed. In the above device, both ends of the axle beam are attached to the rubber butt against the arm. Because they are connected via a There are no strength problems like with torsion beam suspensions.

[0006] However, in the structure described in the above publication, the axle beam and arm The stress concentration at the connection part with the suspension arm is alleviated, while the suspension arm The rigidity in the width direction decreases, making it difficult to maintain the position of the wheels in the width direction when turning, etc. This causes the inconvenience of not being able to do so. Usually, in order to eliminate the above inconvenience, A lateral rod that supports lateral force is installed between the hull beam and the bottom of the vehicle in the vehicle width direction. provided.

[0007] However, above the suspension arm of small passenger cars, etc., A spare tire storage space is often provided, and this storage space is A problem arises in that it is restricted by the lateral rod. Moreover, it is possible to connect the vehicle body side end of the lateral rod to the periphery of the storage space. However, the above storage space is located on the rear floor panel according to the tire shape. Because it is provided by press-molding a circular recess, the above storage space is The peripheral part has low rigidity. Therefore, the lateral rod should not be connected to this part. This makes it easier for wheel vibrations to be transmitted to the vehicle body via the lateral rods, reducing vibration noise. Problems such as deterioration of sound characteristics occur.

[0008] The present invention was devised under the above-mentioned circumstances, and it solves the above-mentioned conventional problems. This solves this problem, eliminates problems with the strength of the suspension arm, and saves tire storage space. A rear suspension for automobiles that can secure the space and improve vibration and noise characteristics. Its task is to provide pensions.

[0009]

[Means to solve the problem]

In order to solve the above problems, the present invention takes the following technical measures. In other words, the present invention extends in the longitudinal direction of the vehicle, and the front end is rotatable around the support shaft on the vehicle body side. A pair of left and right arms that are supported by the an axle beam, and wheels are supported at both ends of the axle beam. In the rear suspension of automobiles, By providing a pair of boss portions located apart in the vehicle width direction at the front end of each of the above arm portions, In both cases, these bosses are pivoted to the vehicle body side support shaft with a set sweep angle via rubber bushings. While supporting the wearer, The axle beam is connected to the left and right arm portions via an elastic member. It is characterized by becoming.

0010

[Functions and effects of the idea]

In the present invention, each of the left and right arms has a pair of bosses located apart in the vehicle width direction. The axle beam that supports the wheels is connected to the vehicle body by the It is connected to the pair of arm parts via an elastic member. The left and right arms above are connected by a pair of bosses located apart in the vehicle width direction. Because of this, the connection strength of the arm part to the vehicle body is high, and therefore the suspension The stiffness of the suspension arm in the vehicle width direction is extremely high. As a result, the lateral force when turning is increased. The arm part can provide sufficient support, and the axis can be mounted without installing a lateral rod. The position of the beam in the vehicle width direction can be maintained. Therefore, larelal rod By providing a Problems such as vibration being transmitted from the rod to the car body and deterioration of vibration and noise characteristics occur. do not have.

[0011] On the other hand, the axle beam is connected to the left and right arms via elastic members. As a result, stress is concentrated on the left and right connecting parts due to the vertical swing of the arm. Never before. For this reason, conventional torsion beads, in which the joints are joined by welding, Stress concentration occurs in the above-mentioned connection parts, such as in the case of the rear suspension, which causes strength problems. This eliminates the need for welding quality to be higher than necessary. The assembly work becomes easier, and it is also possible to streamline the assembly process.

0012 In addition, in the present invention, a pair of boss portions provided at the front ends of the left and right arm portions are Since it is connected to the vehicle body side support shaft via a rubber bush, the axle beam and arc Both the connection part between the arm part and the connection part between the arm part and the vehicle body are Elastically supported. Therefore, vibrations transmitted from the wheels are extremely efficiently blocked. It is possible to significantly improve the vibration and noise characteristics.

[0013] Moreover, both ends of the axle beam are connected to the arm via an elastic member. Because the vehicle is connected, when the vehicle turns, the left and right arms are turned upside down. It can be easily swung in both directions. In this case, the above axle beam is torsioned. It functions as a spring and is elastically twisted and deformed by the vertical movement of the left and right arms. The torsional spring force generated when Therefore, similar to the conventional torsion beam suspension, the above axle beam The system functions as a stabilizer. As a result, there is a stand between the left and right arms. There is no need to separately provide a visor, and space efficiency is improved accordingly. Also, It also becomes possible to reduce weight and manufacturing costs.

[0014] Furthermore, in the present invention, a vehicle body side support that supports the front end boss portion of the arm portion is provided. A sweepback angle is set on the axis. The sweep angle is normally set on semi-trading suspensions. In general, the left and right support shafts that rotatably support the front ends of the left and right arms are located within the width direction of the vehicle. It is set by deviating the side toward the rear of the vehicle. By providing the above sweepback angle, when the left and right arms swing vertically in opposite directions. , in the vehicle width direction of the rear ends of the left and right arms and both ends of the axle beam, which are connected to each other. The trajectory deviation is reduced, allowing the axle beam to swing up and down smoothly in response to the road surface. can be done. As a result, ride comfort is greatly improved.

[0015] Moreover, in the present invention, the connecting portion between the arm portion and the axle beam, and and the connecting part between the arm part and the vehicle body side support shaft is connected via a rubber bush or an elastic member. Because it is supported as a and strain between the axle beams is conveniently absorbed, preventing stress concentration. stomach. In addition, it has the characteristics of a rigid axle suspension, so it has low ground canceling. There is little change in the suspension angle, and it also has the characteristics of a semi-trailing suspension. Because of this, it can also be expected to have an anti-dive effect.

[0016]

[Explanation of Examples]

Hereinafter, embodiments of the present invention will be specifically described based on FIGS. 1 to 4. As shown in FIGS. 1 and 2, the rear suspension 1 according to this embodiment is mounted on a vehicle. A pair of left and right arm portions 2, 2 extending in the front-rear direction, and the rear end portions of these arm portions 2, 2. an axle beam 3 that connects each other, and wheels are provided at both ends of the axle beam 3. 10 are supported and are generally configured.

[0017] Each of the arm portions 2, 2 extends from its inner intermediate portion toward the vehicle body side support shafts 4, 4. The arm portions 2, 2 and the sub-arm portions 5, 5 are provided with sub-arm portions 5, 5 extending from each other. Boss portions 6a and 6b are provided at the front end portions, respectively. Each boss part 6a mentioned above , 6b are located apart in the vehicle width direction, and as shown in FIG. The support shafts 4a and 4b are fitted with cylindrical rubber bushes 7a and 7b, respectively. It is pivotally supported.

[0018] As shown in FIGS. 1 and 2, the vehicle body side support shafts 4a and 4b according to this embodiment are as follows: It is slanted so that it deviates toward the rear of the vehicle as it moves toward the inside of the vehicle body. A sweepback angle θ is set between the width direction axis 4c. In addition, as shown in FIGS. 2 and 3, the rear end portions of each of the arm portions 2, 2 are provided with approximately Connecting portions 11, 11 each having a half-doughnut disk shape are formed, and the connecting portion 1 A pair of cylindrical bosses are provided in the front and rear portions sandwiching the intermediate recesses 11a of Nos. 1 and 11 in the vehicle width direction. Parts 12, 12 are welded.

[0019] On the other hand, the axle beam 3 according to this embodiment is made of cylindrical pipe material. , the intermediate portion 3a sandwiched between the left and right arm portions 2, 2 is curved and deviated downward from the vehicle body. I am forced to do so. In addition, approximately rectangular spindles are provided at both left and right ends of the axle beam 3. The spindle brackets 8, 8 are provided outside the spindle brackets 8, 8. Wheels 10, 10 are supported by spindle shafts 9, 9 that protrude horizontally from the surface, respectively. has been done.

[0020] Also, the inside of the left and right spindle brackets 8, 8 in the axle beam 3 As shown in FIG. 3 and FIG. A pair of substantially elliptical plates 13a and 13b are welded at a widthwise interval, and the boss portion 1 Brackets 13 are formed to connect 2 and 12, respectively. As shown in FIGS. 3 and 4, the pair of substantially elliptical plates 13a and 13b have At the front and rear sides of Through holes 14, 14 are formed. The boss portions 12, 12 formed at the rear ends of the arm portions 3, 3 between the elliptical plates 13a and 13b, extending across the through holes 14 and 14. Cylindrical rubber bushes 16, 16 are connected to a pair of connecting bolts 15, 15 inserted in communication with each other. It is supported through a mantle. In addition, in FIG. 4, the symbol 17 indicates the connection This is a cylindrical spacer interposed between the bolt 15 and the rubber bush 16.

[0021] In the suspension arm 1 according to this embodiment, the front ends of the left and right arm parts 2, 2 are , supported by a pair of boss portions 6a and 6b located apart in the vehicle width direction. Therefore, the connection strength between the arm portions 2, 2 and the vehicle body is extremely high. Moreover, each of the above The connection structure between the beam parts 2, 2 and the axle beam 3 is also located in the longitudinal direction of the vehicle. It is constructed by two connecting bolts 15, 15 each. For this reason, especially The suspension arm 1 has extremely high rigidity in the vehicle width direction, and as a result, the axle The axial position of the beam 3, that is, the vehicle width direction of the left and right wheels 10, 10 with respect to the vehicle body. Can be positioned and maintained without using lateral rods . Therefore, by providing a lateral rod, the storage space for the spare tire can be increased. wheel vibrations are transmitted to the vehicle body via the lateral rods, Problems such as deterioration of vibration and noise characteristics do not occur.

[0022] On the other hand, the axle beam 3 according to this embodiment is , because they are connected via a cylindrical rubber bush 16, the axle beam 3 and the arm parts 2, 2, the stress due to the vertical swing of the arm parts 2, 2 is concentrated. I never go inside. Therefore, the torsion beam is hung on the arm parts 2, 2. The strength of the joints is a problem, as in the conventional welded structure. Nothing.

[0023] In addition, as shown in FIG. By curving the intermediate portion 3a toward the bottom of the vehicle body, the space for storing tires can be expanded. Both are possible.

[0024] Furthermore, in this embodiment, the front end boss portions 6a, 6b of each arm portion 2, 2 and the vehicle Body side support shafts 4a, 4b, rear end boss portions 12, 12 of each arm portion 2, 2 and axis and the rubber bushes 3 are all connected via rubber bushes 7a, 7b, and 16. Therefore, the vibration of the wheel 10 is transmitted through the axle beam 3 and the arm parts 2, 2 to the vehicle body. It is possible to very efficiently block the transmission of For this reason, the vibration of the vehicle body Dynamic noise characteristics are significantly improved.

[0025] Moreover, both ends of the axle beam 3 have elasticity with respect to each arm part 2, 2. Because they are connected in a deflectable manner, when the vehicle turns, the left and right arm portions 2, 2 can be swung upside down. At this time, the axle beam 3 is It functions as a spring, and is elastically moved by the vertical movement of the left and right arm parts 2, 2. The torsional elastic force generated when the left and right arm portions 2, 2 are torsionally deformed is The vertical movement is mutually adjusted and therefore the conventional torsion beam suspension Similarly, the axle beam 3 functions as a stabilizer. this As a result, driving stability is improved and there is no need to install a separate stabilizer. Therefore, the space can be used more effectively.

[0026] Furthermore, in this embodiment, as shown in FIG. 1 and FIG. A sweepback angle θ is set on the vehicle body side support shafts 4a and 4b to which the boss portions 6a and 6b of 2 and 2 are pivotally connected. ing. By setting the sweepback angle θ above, the semi-trading arm type suspension can be This makes it possible to incorporate the characteristics of different versions. That is, when the left and right arm sections 2, 2 swing in vertically opposite directions, the rear end of the arm section The deviation in the trajectory of the axle beam end connected to this in the vehicle width direction is reduced, and the The Xsuru beam 3 can swing up and down smoothly. For this reason, the ride comfort Much improved.

[0027] Moreover, in this embodiment, as described above, the vehicle body side support shafts 4a, 4b and the arc between the arm part 2 and the sub-arm part 5, and between the arm part 2 and the axle beam 3. Rubber bushes 7a, 7b, 16 are interposed in all the connecting parts between the Therefore, twisting at each connection part is prevented by the rubber bushes 7a, 7b, 16. The stress is absorbed conveniently, and there is no stress concentration around the joint. In addition, since it has the characteristics of a rigid axle type suspension, the ground camber is There is little change in the angle, and it also combines the characteristics of a semi-trailing type suspension. Therefore, an anti-dive effect can be expected.

[0028] The present invention is not limited to the above embodiments. In the embodiment, it is interposed between the axle beam 3 and the left and right arm parts 2, 2. Although a cylindrical rubber bush 16 was used as the elastic member, elastic members of other shapes could also be used. It can also be used. Moreover, between each arm part 2, 2 and the vehicle body side support shaft 4a, 4b, The interposed rubber bushes 7a and 7b have the same elastic modulus. However, the inner rubber bush 7b supports the vehicle width direction force acting on the axle beam 3. Therefore, a material with a lower elastic modulus than the outer rubber bush 7a is used. can be done.

[0029] In addition, in the example, in order to expand the tire storage space, The middle part of the frame 3 is curved downward, but a straight axle beam is used. You can also do that. In addition, although the pipe-shaped axle beam 3 was adopted in the embodiment, the cross section was U-shaped. It is also possible to employ axle beams with other cross-sectional shapes. Further, the rear end portion of each arm portion 2 and the axle beam 3 are connected by a pair of front and rear connecting bolts. They were connected by bolts 15 and 15, but a structure in which they were connected by a single connecting bolt was adopted. You can also.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of a rear suspension according to the present invention.

FIG. 2 is a plan view of the rear suspension according to the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3.

FIG. 5 is a plan view of a conventional example.

[Explanation of symbols]

1...Suspension 2...Arm part 3...Axle beam 4a, 4b...support shaft 6a, 6b...Boss part 7a, 7b...Rubber bushing 10...Wheel 16...Elastic member (rubber bush) θ…Retreat angle

Claims (1)

[Scope of utility model registration request] [Claim 1] A pair of left and right arm portions extending in the longitudinal direction of the vehicle and whose front ends are rotatably supported by a support shaft on the vehicle body side, and an axle beam provided in a manner spanning the left and right arm portions. In a rear suspension for an automobile in which wheels are supported at both ends of the axle beam, a pair of boss portions are provided at the front end of each of the arm portions and are spaced apart in the vehicle width direction, and the boss portions are set at a swept angle. A rear suspension for an automobile, characterized in that the axle beam is pivotally supported via a rubber bush on a support shaft on the vehicle body side, and the axle beam is connected to the left and right arm portions via an elastic member. .