JP2000127777A - Support structure for vehiclar transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stress concentration on a bolt by holding a leaf spring, a mount bracket and a transmission at one-point with a single bolt approximately at a enter between right and left side members laid as a pair. SOLUTION: A leaf spring 2 and a Z-shaped mount bracket 4 approximately at a center between right and left side members laid as a pair and extended in the lengthwise direction of a vehicle are connected to each other with a single bolt 7 via a spacer 6, and a transmission 3 is supported at one point. In this case, as the transmission 3 is supported at one point with the single bolt 7 and a mount bracket 4 having an elastic body 5, an engine vibration or a vibration during travel on the rough road is absorbed approximately in all 360 deg. ranges around the bolt 7. Also, even when a power line is twisted at starting an engine or due to an engine speed fluctuation or the like, the variation of the leaf spring 2 is small, thereby reducing stress concentration on the bolt 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a transmission between a pair of side members of a chassis frame of a vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 3, a transmission 3 is fixed to an upper surface of a leaf spring 2 provided between a pair of left and right side members 1 extending in the longitudinal direction of a vehicle in a chassis frame of the vehicle. Is fastened and supported by two bolts 9a and 9b via a bracket 8, and the transmission 3 is supported between the pair of side members 1 to improve the mountability of other components on the upper surface of the side members and to bounce and rebound the suspension. A supporting structure of a transmission for a vehicle in which displacement caused by the vehicle is suppressed is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 9-18849. In FIG. 3, reference numeral 6 denotes a spacer.

[0003]

In the above conventional structure,
The transmission 3 is supported on the leaf spring 2 by two bolts 9a and 9b. As shown in FIG. 4, the leaf spring 2 is greatly deformed due to the two-point support between the two-point shafts when the power line is twisted due to starting of the engine or rotation fluctuation. Due to the large amount of deformation of the leaf spring 2, there is a possibility that a large load acts due to stress concentration on the bolts 9a and 9b.

[0004] It is an object of the present invention to provide a vehicle transmission support structure in which stress concentration on a bolt supporting the transmission between a pair of side members is reduced.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a leaf spring which is provided between a pair of left and right side members extending in the vehicle front-rear direction in a vehicle chassis frame, and has upper and lower elastic surfaces. A transmission in which a mount bracket sandwiched by a body is fixed on the upper surface, and the leaf spring and the mount bracket at a substantially central portion between the pair of left and right side members are fastened by one bolt to perform the speed change. Machine to the leaf spring
It is characterized by point support.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a pair of left and right side members extending in the vehicle front-rear direction of a chassis frame of a vehicle, and 2 denotes a leaf spring installed between the pair of left and right side members 1.

[0007] In FIGS. 1 and 2, reference numeral 3 denotes a transmission supported by the leaf spring 2. A Z-shaped mount bracket 4 having upper and lower surfaces sandwiched between elastic members 5 such as rubber is fixedly provided on the upper surface of the transmission 3.

The leaf spring 2 and the mounting bracket 4 at a substantially central portion between the pair of left and right side members 1 are fastened by one bolt 7 with a spacer 6 interposed therebetween, thereby supporting the transmission 3 at one point. It was done.

Since the present invention is structured as described above, the transmission 3 is supported at one point by one bolt 7 and the mount bracket 4 provided with the elastic body 5 at the center position of the leaf spring 2. It absorbs engine vibrations and vibrations when traveling on rough roads over the entire 360 ° range around the bolt 7.

Further, since the single point support by one bolt 7 at the center position of the leaf spring 2, even if the power line is twisted at the time of engine start or rotation fluctuation, the amount of deformation of the leaf spring 2 is small. 7 can be reduced.

[0011]

As described above, according to the present invention, the transmission is controlled by one bolt via the mount bracket provided with the elastic body at the center position of the leaf spring between the pair of side members of the chassis frame of the vehicle. Due to the support structure, it absorbs engine vibrations and vibrations on rough roads over the entire 360 ° range centered on the bolts, and also deforms the leaf springs due to twisting of the power line at engine start-up and rotation fluctuations. This has the advantage of reducing the amount, reducing the stress concentration on the bolt, and improving the supportability of the transmission. Also, since the number of support bolts is halved,
The number of parts and the number of assembly steps are reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a support structure for a transmission of a vehicle according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a front view showing a conventional vehicle transmission support structure.

FIG. 4 is a defect diagram of a conventional vehicle transmission support structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side member 2 Leaf spring 3 Transmission 4 Mount bracket 5 Elastic body 6 Spacer 7 Bolt

Claims (1)

[Claims] 1. A transmission having a leaf spring extending between a pair of left and right side members extending in the vehicle longitudinal direction of a chassis frame of a vehicle and a mount bracket having upper and lower surfaces sandwiched by elastic bodies fixed to an upper surface. Wherein the leaf spring and the mounting bracket at a substantially central portion between the pair of left and right side members are fastened with one bolt to support the transmission at one point on the leaf spring. Support structure for vehicle transmission.