JPH0399915A - Axle suspension device - Google Patents

Abstract

PURPOSE:To make excellent rigidity and flexibility compatible by forming an upper arm to support a final reduction gear into an about H-shaped pattern, and connecting a pair of its front ends to a car body and a pair of its rear ends to both sides of the final reduction gear respectively. CONSTITUTION:A pair of lower arms 10 support an axle 11 on a car body, and a pair of upper arms 12 support a final reduction gear 13 on a car body frame 14. In this case, the upper arm 12 is formed of a pair of straight-line shaped arm parts 12a, a connecting part 12b to mutually connect their central parts and an angle brace part 12c to connect the arm part 12a with the connecting part 12b into an about H-shaped pattern. The upper arm 12 rotatably connects a front end 12d of the arm part 12a to the car body frame 14, and similarly its rear end 12e to a supporting part protrusively provided on both sides of the final reduction gear 13. Thus excellent rigidity and flexibility can be made compatible, and the degree of design freedom also can be improved.

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to an axle suspension system.

b. Prior art and its problems Figures 6 to 8 show examples of conventional axle suspension systems.

This device comprises a pair of lower arms 1.1 and an axle 2.1.
2, and one upper arm 3 supports the final reduction gear 4.

The upper arm 3 is formed in a substantially A-shape, and its pair of front end portions 3a, 3a are pivotally supported by the vehicle body frame 5, and its one rear end portion 3b is connected to the final reduction gear f4 via a ball joint 6. connected to the top.

However, in the above-mentioned device, the ball joint 6 that connects the rear end portion 3b of the upper arm 3 is arranged at a considerably high position, so there is a problem that the degree of freedom in design regarding this arrangement position is reduced.

Further, in the above-mentioned device, when the final reduction gear 4 is arranged offset to one side, the position of the ball joint 6 is also offset, which has the disadvantage that the balance between left and right turning performance is lost.

On the other hand, conventionally, there is an axle suspension system that uses a pair of upper arms (not shown).

In this device, the rear end portions of the pair of upper arms are connected to the left and right side portions of the final reduction gear, respectively.

Therefore, there is an advantage that the degree of freedom in designing the arrangement position of the upper arm is increased.

However, although this device is strong against forces in the longitudinal direction of the vehicle, it is weak against force in the axle direction (lateral direction) and rolling.

In general, an upper arm is rigid in the longitudinal direction of the vehicle and in the axle direction, has flexibility against rolling, and has sufficient strength to withstand forces in each direction. There is a need.

The above device had insufficient rigidity and strength, particularly in the axle direction.

The present invention has been made in view of the above circumstances, and has a high degree of freedom in designing the arrangement position of the upper arm, and has sufficient rigidity and flexibility against forces in the vehicle longitudinal direction, axle direction, and rolling direction. and an axle suspension system having strength.

C6 Means for Solving Problems In order to achieve the above object, the present invention provides an axle suspension system in which an axle is supported by a pair of lower arms and a final reduction gear is supported by an upper arm, in which the upper arm is formed into a substantially U-shape. The pair of front ends are connected to the vehicle body, and the pair of rear ends are connected to the N1fi
The structure is such that they are connected to the left and right sides of the speed device, respectively.

d. Example Hereinafter, an example of the axle suspension system according to the present invention will be described.
A detailed description will be given with reference to the accompanying drawings.

1 to 5 show an embodiment of the present invention.

In the device of this embodiment, an axle 11.11 is supported on a vehicle body (not shown) by a pair of lower arms 10.10, and a final reduction gear 13 is supported on a vehicle body frame 14 by an upper arm 12.

The upper arm 12 has a pair of linear arm portions 12a, 12.
a, a connecting part 12b connecting these at the center, and 4 connecting each arm part 12a, 12a and connecting part 12b.
Approximately triangular cane portions 12c, 12c disposed at the corners;
12c, 12c.

The upper arm 12 has front end portions 12d, 12d of the arm portions 12a, 12a rotatably connected to the vehicle body frame 14, and rear end portions 12e, 12e of the upper arm 12, which are supported by protrusions on the left and right sides of the final reduction gear 13. It is rotatably connected to the parts 13a, 13a.

The rear end portions 12e, 12e of the upper arm I2 are connected to the support portions 13a, 13a of the final reduction gear 13 through ball joints 15, 15 as shown in FIG. 4, or as shown in FIG. Rubber bushing 16 as shown
．． 16 may also be used.

In this embodiment, the upper arm 12 has left and right arm portions 1
2a and 12a in the vehicle longitudinal direction (A shown in Figure 3).
The connecting portion 12b and the armrest portions 12c, 12c, 12c, 12c have the same rigidity in the axle direction (direction B shown in FIG. 3), and the connecting portion 12b has rigidity in the rolling direction. It has flexibility in the direction C (direction C shown in FIG. 3).

In particular, the upper arm 12 has sufficient strength against forces in the axle direction by increasing the bending rigidity of the connecting portion 12b, and the pair of front and rear support portions 12c and 1
2c also sufficiently increases the rigidity and strength in that direction.

In addition, by setting the torsional rigidity of the connecting portion 12b to an appropriate value, the support portions 12c, 12c can be improved.
.

12c, the elasticity of the central portion which is not affected by 12c provides sufficient flexibility against forces in the rolling direction.

As can be seen in FIG. 4, in this embodiment, the connecting position force of the rear ends 12e, 12e of the upper arm 12 is at a position lower by a distance 'HD than in the conventional case.

In addition, in FIG. 1, 17 is a rear wheel.

e. As described in detail, according to the axle suspension system according to the present invention, the upper arm is formed in a substantially U-shape, and the pair of front ends thereof are connected to the vehicle body, so that the upper arm is To obtain sufficient rigidity in the longitudinal direction of the vehicle by the left and right arm portions, to obtain sufficient rigidity in the axle direction by the connecting portion, and to set the torsional rigidity of the connecting portion to an appropriate size. This provides sufficient flexibility in the rolling direction.

In addition to the above effects, since the pair of rear end portions of the upper arm are respectively connected to the left and right side portions of the final reduction gear, there is a high degree of freedom in designing the arrangement position of the upper arm.

[Brief explanation of drawings]

1 to 5 show an embodiment of an axle suspension system according to the present invention, and FIG. 1 is a conceptual diagram showing how it looks from the rear,
FIG. 2 is a conceptual diagram showing the side view, FIG. 3 is a perspective view of the upper arm, and FIGS. 4 and 5 are conceptual diagrams showing the method of connecting the upper arm to the final reduction gear. Figures 6 to 8 show conventional axle suspension systems;
The figure is a conceptual diagram showing how it looks from the rear, Figure 7 is a conceptual diagram showing how it looks from the side, and Figure 8 is a W1 conceptual diagram showing the connection position of the upper arm and final reduction gear. . DESCRIPTION OF SYMBOLS 10...Lower arm, 12...Upper arm, 12b...Connection part, 12d...Front end part, 13...Final reduction gear, 15...Ball gear insert, 11...Axle, 12a ...Arm portion, 12c...Legs, 12e...Rear end, 14...Vehicle frame, 16...Rubber busher. , notification

Claims (1)

[Claims] In an axle suspension system in which an axle is supported by a pair of lower arms and a final reduction gear is supported by an upper arm, the upper arm is formed into a substantially H-shape, and its pair of front ends are connected to the vehicle body, and its pair of rear ends are connected to the vehicle body. An axle suspension system characterized in that end portions are respectively connected to left and right side portions of the final reduction gear.