JP3526717B2 - Transmission support structure for rear engine bus - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear engine in which a power unit including an engine and a transmission is disposed at the rear end of a vehicle with its engine axis orthogonal to a vehicle center axis. The present invention relates to a bus transmission support structure. 2. Description of the Related Art In a rear engine bus having a power unit including an engine, a transmission and the like arranged at a rear end of a vehicle, an engine shaft is orthogonal to a vehicle center line so as to increase an effective floor area of a passenger compartment. Buses with power units arranged horizontally are known. FIG. 5 is a plan view of a rear portion of a conventional rear engine bus. In a power unit 1 in which a transmission 3 is mounted on an engine 2 and further an angle drive device 4 is mounted, an engine shaft E is connected to a vehicle center axis C. At right angles, it is provided at the rear end of the body B. The angle drive device 4 and the rear axle 5 are connected to a propeller shaft 6.
The rotational force is transmitted from the engine 2 via the transmission 3 to the rear axle 5 in a direction changed by the angle drive device 4. [0004] The power unit 1 includes an engine 11
A and 12A are supported by the chassis or body B at three points, that is, one point on the rear side 13A of the vehicle at the rear end of the transmission. In such a support structure of the power unit 1, since the engine 2 and the transmission 3 and the like are integrally supported, for example, the transmission 3
There is a drawback that it is difficult to attach and detach them alone to maintain the clutch and the clutch. Therefore, when the transmission 3 and the angle drive device 4 are supported only on the engine side, the transmission 3 and the angle drive device 4 are overhanged. Also, since there is a relative movement in the vertical direction between the rear axle 5 and the body B, this results in a change in the distance between both ends of the propeller shaft 6, which is dealt with by expansion and contraction of the spline joint. Therefore, a thrust is generated by the frictional force, and a bending moment is applied to the power unit 1. When the engine 2 and the transmission 3 are respectively supported, the number of support points is four to five, and there is also a problem of manufacturing accuracy between the power unit side and the body side. A problem arises that is difficult to do. [0006] Accordingly, the present invention relates to a rear engine bus in which a power unit such as an engine and a transmission is disposed at the rear end of a vehicle with a vehicle center axis and an engine axis orthogonal to each other. Mainly supports the power unit on the engine side, suppresses bending moment due to thrust of the propeller shaft, cuts off transmission of vibration on the power unit side, and also supports transmission that absorbs manufacturing errors between body and power unit. The purpose is to provide a structure. According to the present invention, there is provided a transmission for a rear engine bus in which a power unit including an engine and a transmission is disposed at a rear end of the vehicle so that an engine shaft thereof is orthogonal to a vehicle center axis. In the supporting structure, a first bracket is fixedly mounted on a vehicle front side at a rear end portion of the transmission, a second bracket is provided at a position facing the first bracket on a body side, and a narrow diameter portion is provided at both ends. A shaft is provided, an elastic body is interposed on both sides of each of the first and second brackets, a small-diameter portion of the shaft is inserted, and a washer is screwed to a shaft end of the shaft to form a first and a second. 2
Are connected via an elastic body. Since the present invention is constructed as described above, the first and second brackets are connected to each other by an axle with elastic members interposed on both sides, so that the rear end portion of the transmission is elastic in the forward direction of the vehicle. Supported through the body. Therefore, the thrust generated on the propeller shaft is transmitted to the body and the moment applied to the power unit is suppressed, but the vibration of the power unit is cut off and not transmitted to the body. In addition, when the power unit is mounted, manufacturing errors can be absorbed by the elastic body. Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a plan view of the rear part of the rear engine bus is shown.
The power unit 1 is mounted on the body B. The support members 11 to 14 support the weight of the power unit 1 by interposing an elastic body between brackets protruding from the engine 2 and the body member 9, respectively, and block transmission of vibration. Referring also to FIG. 2, a first bracket 7 is screwed on the rear end of the transmission 3 on the vehicle front side, and a second member 7 is provided at a position of the body member 9 opposed to the first bracket 7. And a support member 15 having an elastic body interposed between the first and second brackets 8.
Are connected by FIG. 3 shows the support member 15. A second bracket 8 is provided on the body member 9 at a position opposite to the first bracket 7 provided on the vehicle front side at the rear end of the transmission 3, and penetrates the first and second brackets 7, 8. A shaft 16 is provided.
The shaft 16 has, at both ends, a threaded portion 16a and a small-diameter portion 16b into which the elastic body 17 is inserted, and a large-diameter portion 16d at the center is formed via a flange portion 16c. A flat portion is provided for applying a tool. The small diameter portion 16b of the shaft 16 is
And the first and second sides of the brackets 7 and 8 respectively
The elastic bodies 17, 17 are inserted through the washers 18, 18, respectively. Then, a second washer 19 is inserted outside the elastic body 17, and a nut 20 is screwed to the screw portion 16a. The small-diameter portion 16b includes an elastic body 17 to be inserted,
17 is formed so as to provide a predetermined precompression between the collar portion 16 c and the washer 19, so that the force applied to one of the brackets 7 or 8 is applied via the elastic body 17 to the second washer 19. Or it is transmitted to the brim 16c,
Then, it is transmitted from the shaft 16 to the other bracket 8 or 7 via the other elastic body 17. In addition, since the shaft 16 and the brackets 7 and 8 are supported via an elastic body, there is a degree of freedom not only in the axial direction but also in the inclination.
Dimensional errors in the axial direction and the direction perpendicular to the axis between the body B and the power unit 1 can be absorbed, and vibration transmission from the power unit 1 side to the body B side is cut off. FIG. 4 shows another embodiment (the figure shows the first bracket side). The configuration of the shaft is different from that of the above-described embodiment. The small-diameter portion and the collar portion are separated from each other, and a female screw is provided on the shaft 16A to form the small-diameter portion 20a.
Is screwed into the bolt 20A. In this embodiment, since the shaft 16A is short, it is easy to insert it between the brackets 7 and 8. Although the precompression length of the elastic body 17 is regulated by the step between the small diameter portion 20a and the screw portion 20b, the length may be regulated by inserting a collar. The present invention has the following effects because it is configured as described above. (1) Thrust input from the propeller shaft is transmitted to the body side, and the moment applied to the power unit is suppressed. (2) Since the power unit can be supported by the engine,
The transmission, clutch, etc. can be attached and detached while keeping the engine side as it is. (3) Since an elastic body is interposed and connected to the support between the body and the transmission, manufacturing errors can be absorbed, and the vibration of the power unit is cut off and is not transmitted to the body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a rear engine bus embodying the present invention. FIG. 2 is a side view of the power unit shown in FIG. FIG. 3 is an explanatory view showing one embodiment of the present invention. FIG. 4 is an explanatory view showing another embodiment of the present invention. FIG. 5 is a plan view showing a conventional power unit support structure. [Description of Signs] 1 Power unit 2 Engine 3 Transmission 4 Angle drive device 5 Rear axle 6 Propeller shaft 7 First bracket 8 Second bracket 9 body members 11 to 14 support member 15 support member 16 shaft 17 elastic members 18 and 19 washers 20 nut B -Body C: Vehicle center axis E: Engine axis

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B60K 5/04 B60G 25/00 B62D 47/02 F16F 1/37

Claims (1)

(1) A transmission support structure for a rear engine bus in which a power unit including an engine and a transmission is disposed at a rear end of the vehicle so that an engine shaft thereof is orthogonal to a vehicle center axis. A first bracket is fixed to a vehicle front side of the rear end of the transmission, a second bracket is provided at a position facing the first bracket on the body side, and a shaft having a small diameter portion is provided at both ends; An elastic body is interposed on both sides of each of the first and second brackets, and a small diameter portion of the shaft is inserted therethrough, and a washer is screwed to a shaft end of the shaft to form first and second brackets. A transmission support structure for a rear engine bus, wherein the transmission support structure is connected via an elastic body.