JPH02128923A - Power unit supporting structure for vehicle - Google Patents

Abstract

PURPOSE:To disperse impact force at the time of a rear-end collision to a plurality of frames to efficiently absorb the force by additionally attaching respective members abutted each other at the time of the rear-end collision to a differential input the power of an engine and a body side frame positioned at the rear thereof. CONSTITUTION:Side frames 1 extended in a front and rear direction are connected each other by a cross member 3 and is arranged at both the sides, left and right, of the body of a car. A differential 4 is arranged below the cross member 3. In this case, a bracket 15 as an abutting member is additionally attached to the upper rear portion of the differential 4. A bracket 16 as an abutting member is additionally attached to the cross member 3 at the rear of the bracket 15. When the body is collided from behind, according to the forward movement of the cross member 3, both the brackets 15, 16 are abutted to each other. Impact force is thereby dispersed to the side frame 1 and a power plant frame 8.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a power unit support for a vehicle that can be used in a vehicle in which a differential as a power unit provided at the rear of the vehicle body and an engine side are connected by a connecting member. It's about structure.

[Conventional technology]

For example, in rear-wheel drive cars, Japanese Patent Application Laid-Open No. 56-28053
As disclosed in the publication, the driving force of the engine is transmitted to the rear wheels via a propeller shaft and a differential (hereinafter referred to as differential). The above differential is supported below the rear of the vehicle body. Further, the case of the differential and the case of the engine side member are connected by a power plant frame.

[Problem to be solved by the invention]

However, in the conventional structure described above, the force applied to the vehicle body due to a rear-end collision is supported only by the side frames provided in the longitudinal direction on both sides of the vehicle body. Therefore, the side frame must have very high rigidity. For this reason, a structure such as increasing the thickness of the side frame or providing reinforcement is required, resulting in an increase in vehicle weight.

[Means to solve the problem]

In order to solve the above-mentioned problems, the vehicle power unit support structure of the present invention supports the differential that inputs the output of the engine through the propeller shaft below the rear of the vehicle body, and also supports the differential case and the engine side. In a power unit support structure for a vehicle in which the case of the member is connected by a connecting member arranged along the propeller shaft, the above differential is provided with a differential side abutting member, while the vehicle body side member is connected to the vehicle body by a connecting member arranged along the propeller shaft. The side contact member is provided at the rear of the differential side contact member so that the side contact member can contact the differential side contact member when the side contact member moves forward.

[For production]

Some vehicles have a differential case and an engine side member case connected by a connecting member. In such a vehicle, by providing the above-mentioned connecting member, it is possible to reduce vibrations and to suppress differential wide-up phenomena, power hop phenomena, and the like.

That is, in order to reduce vibration, it is better to connect the members as one rigid body over a long span.

Therefore, as described above, if the case of the differential and the case of the engine-side member are connected by the connecting member, the number of rubbers can be reduced and vibrations can be reduced. In addition, in vehicles that are not equipped with the above-mentioned connecting members,
When the driving force of the engine is transmitted from the propeller shaft at the time of starting, the differential is attached to the vehicle body via a buffer member, and the wheels connected to the output shaft of the differential are connected to the vehicle. Due to the weight and contact with the ground, the case first rotates within the rotatable range, and then begins normal rotation. That is, the vehicle starts with a slight time delay corresponding to the displacement of the differential, resulting in poor responsiveness.

Therefore, if the above-mentioned connecting member is provided, the rotation of the engine will be immediately transmitted to the rear wheels without the differential being displaced along with the case, allowing the vehicle to start with high responsiveness. .

In the present invention, the structure including the above-mentioned connecting member is used, and the differential is provided with a differential side contact member, and the vehicle body side member is provided with a vehicle body side contact member that contacts the differential side when the differential moves forward. It is configured to be provided at the rear of the differential side contact member so as to be able to come into contact with the member. According to such a configuration, when the vehicle is rear-ended from behind, the force due to the rear-end collision is applied to the side frames provided in the longitudinal direction on both sides of the vehicle body, and the side frames tend to move forward. At this time, the vehicle body side contact member provided on the vehicle body side contacts the differential side contact member provided on the differential. Therefore, the force applied from the rear of the vehicle body is distributed to both side frames and the connecting member connected to the differential. As a result, it is possible to provide high rigidity against rear-end collisions with a simple structure without having to thicken only the side frame or provide reinforcement, and the vehicle Weight reduction can be achieved.

[Example] An example of the present invention will be described below based on FIGS. 1 and 2.

As shown in FIG. 2, a car has a side frame frame (not shown) installed at the lower rear part of the car body and extending in the longitudinal direction of the car body.
are placed on both sides of the vehicle. The front portions of these side frames 1 are connected to side sills (not shown). A suspension shock absorber 2 is installed on the side frame 1.
A bent portion 1a for avoiding the shock absorber 2 is formed at a portion corresponding to the side frame 1.
It has a slanted shape from a. The above-mentioned side frames 1 are connected by a cross member 3 serving as a vehicle body side member immediately behind the bent portion 1a.

A differential (hereinafter referred to as a differential) 4 is provided below the cross member 3.

The differential 4 has a protrusion 5 on its upper portion that protrudes in an angular shape in the left-right direction. Buffer mounting portions 6 and 6 having a buffering function are provided at both ends of this protruding portion 5, and the differential 4 is attached to a bracket (not shown) provided on the lower surface side of the cross member 3 at these buffer mounting portions 6 and 6. is attached to.

As shown in FIG. 1, a rear end portion of a propeller shaft 7 is connected to the front portion of the differential 4. As shown in FIG. The front end of the propeller shaft 7 is connected to an output shaft of a transmission connected to an engine (not shown). Further, the case of the differential 4 and the case of the transmission are connected by a power plant frame 8 as a connecting member in order to prevent the wind-up phenomenon of the differential 4 and reduce vibration. On the other hand, an axle shaft 9 is connected to both sides of the differential 4, and the other end of the axle shaft 9 is connected to a rear wheel (not shown).

Near the bending part la in the above side frame 1,
A swingable A-shaped upper arm 10 is connected to the upper arm 10, and a lower arm 11 is connected below the upper arm 10.
is provided. Also, behind cross member 3,
A main silencer 12, a gasoline tank 13, etc. are provided, and rear seats 14 are provided on the vehicle body floor (not shown) above and in front of the cross member 3.

On the other hand, a differential side bracket 15 as a differential side abutting member is provided at the upper part of the rear part of the differential 4, and a cross member 3 at the rear of this differential side bracket 15 is provided with a vehicle body side abutting member. A side bracket 16 is provided. The differential side bracket 15 and the vehicle body side bracket 16 face each other with a predetermined distance therebetween, and the distance between the two is set in consideration of the range in which the differential side bracket 15 vibrates due to the vibration of the differential 4. . A retaining part 15a that protrudes rearward is formed at the upper part of the differential side bracket 15, and a retaining part 15a that protrudes forward and can be engaged with the engaging part 15a of the differential side bracket 15 is formed at the lower part of the vehicle body side bracket 16. 16a is formed.

In the above-mentioned configuration, when the vehicle receives a rear-end collision, a force is applied to the side frame 1 to bend it at the bent portions 1a and move it forward and upward.

At this time, since the cross member 3 also moves forward at the same time, the vehicle body side bracket 16 provided on the cross member 3 comes into contact with the differential side bracket 15 provided on the differential 4.

Therefore, the force due to the rear-end collision is 2 wooden side frames 1,
It is dispersed and absorbed by the power plant frame 8 connected to the differential 4, thereby suppressing deformation of the vehicle body. Furthermore, the engaging portion 15a of the differential side bracket 15 and the engaging portion 16a of the vehicle body side bracket 16 engage with each other, and the side frame member 1 and the cross member 3 move upward, that is, toward the passenger compartment. is regulated, so
The pressure on the cabin space is suppressed.

〔Effect of the invention〕

As described above, in the vehicle power unit support structure of the present invention, the differential that inputs the output of the engine through the propeller shaft is supported below the rear of the vehicle body, and the case of the differential and the case of the engine side member are connected to each other. However, in a vehicle power unit support structure that is connected by a connecting member arranged along the propeller shaft, the differential is provided with a differential side contact member, while the vehicle body side member is provided with a vehicle body side contact member. is provided at the rear of the differential side abutting member so that it can come into contact with the differential side abutting member when it moves forward.

Therefore, sufficient rigidity can be secured against a rear-end collision with a simple structure without thickening the side frame or providing a cross member, and the weight of the vehicle can be reduced. This has the effect of making it possible to achieve the following.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a schematic front view showing the main parts of the power unit support barrel structure, and Figure 2 being a lower structure at the rear of the vehicle body. FIG. 1 is a side frame, 1a is a bending part, 2 is a shock absorber, 3
is a cross member (vehicle body side member), 4 is a differential, 7 is a propeller shower plant frame (connecting member), side bracket (differential side contact member), 1 a is an engaging part, 16 is a vehicle body side bracket contact member) It is. 8 is pa 15 is differential 5a/16 (body side abutment)

Claims (1)

[Claims] 1. The differential that inputs the engine output through the propeller shaft is supported below the rear of the vehicle, and the case of the differential and the case of the engine side member are connected to a connecting member arranged along the propeller shaft. In the power unit support structure of a vehicle that is connected to each other, the above-mentioned differential is provided with a differential-side abutting member, and the vehicle-body-side member is provided with a vehicle-body-side abutting member that, when moved forward, is provided with a differential-side abutting member. 1. A power unit support structure for a vehicle, characterized in that the power unit support structure is provided at the rear of a differential side contact member so as to be able to come into contact with the differential side contact member.