JPH06127280A - Vehicle power transmission device - Google Patents

Abstract

PURPOSE:To prevent generation of amplified noise due to engine vibration between an engine and a transmission in a power transmission device of a front engine/rear drive type vehicle having a long wheel base. CONSTITUTION:A transmission 3 is separated rearward from an engine 1 to be installed in the middle part of a wheel base. A clutch 2 of the engine 1 is connected to the transmission 3 with a transmission mechanism such as a propeller shaft 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a front engine / rear drive type vehicle having a long wheel base such as a truck.

[0002]

2. Description of the Related Art Conventionally, in a medium- or large-sized vehicle having a long wheelbase, such as a medium- or large-sized truck, a front engine / rear drive type engine is mounted in the front part of the vehicle to drive rear wheels. In a vehicle, a power transmission device in which an engine, a clutch, and a transmission are compactly integrated and mounted on the front part of the vehicle, and the transmission and the rear wheel differential gear are connected by a long propeller shaft is provided. Has been adopted.

In order to increase the load capacity of such a medium-sized or large-sized truck, the engine, the transmission, etc. are generally installed under the driver's seat to form a cab-over type.

[0004]

However, in the conventional medium- and heavy-duty trucks having such a configuration, the weight of the integrated engine, clutch, transmission, etc. is applied to the front wheels, and the load on the front wheels is increased. Cage,
Moreover, because the coupling between the engine clutch and the transmission case is connected by a rigid structure, the engine vibration is transmitted to the clutch and the transmission, and both vibrations propagate to each other, resulting in more than the engine vibration noise. There is a problem that high amplified sound may be generated.

The present invention was devised in view of the above-mentioned problems, and the transmission is separated from the engine and installed in the rear intermediate portion of the vehicle so that the vibration of the engine is not transmitted to the transmission and the clutch and the transmission are not transmitted. Eliminating mutual propagation of vibrations between
An object of the present invention is to provide a vehicle power transmission device capable of preventing the generation of amplified sound.

[0006]

Therefore, a vehicle power transmission device of the present invention is a front engine / rear drive type vehicle having a long wheelbase, in which the transmission is separated from the engine rearward. It is characterized in that it is installed in the middle part and that the clutch connected to the engine and the transmission are connected by a transmission mechanism such as a propeller shaft.

[0007]

In the above-described power transmission device for a vehicle of the present invention, since the engine and the transmission are separated from each other, the vibration of the engine is not transmitted to the transmission, and the vibration of the engine is generated between the clutch of the engine and the transmission. Vibration sounds do not propagate each other. Therefore, a high amplified sound due to mutual propagation is not generated between the two.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show an embodiment of a power transmission device for a vehicle according to the present invention, and FIG. 1 shows an outline of the device. 2 is a side view of a medium / heavy truck equipped with this device, FIG. 3 is a side view of a transmission mounting portion, and FIG. 4 is a top view of FIG. Indicates almost the same part.

In FIG. 1, 1 is an engine, 2 is a clutch connected to the engine 1, and 3 is a transmission which is provided in the rear intermediate portion of the vehicle and is separated from the engine 1 and the clutch 2. Frame 4
Is attached to. The clutch 2 and the transmission 3 are connected by a transmission mechanism such as a propeller shaft 5, and the transmission 3 and the rear wheel differential gear 6 are also connected by a propeller shaft 7.

That is, the medium / heavy truck A shown in FIG.
As described above, the engine 1 and the clutch 2 are integrally installed at a position below the cab (passenger compartment) 8 and above the front wheels 9, and the transmission 3 is installed between the wheel bases (symbol a).
(See between b)) is installed at a position approximately in the middle or slightly forward. If the transmission 3 is installed at a position rearward of the vehicle more than necessary, the load on the rear wheel 10 will increase. Therefore, the position of the transmission 3 near the intermediate portion of the vehicle or slightly forward thereof It is suitable to be set to.

Further, referring to FIGS. 3 and 4, an example of a mounting structure of the transmission 3 in which the transmission 3 is separated from the engine 1 will be described. Left and right pair of transmission mounts 1
1, 12 are provided at the front and rear. Then, the lead-out portion 14a of the front universal joint 14 of the transmission 3 is clamped at the center of the support rod 13 suspended via the cushion 16 between the front mounts 11 and 11, and the rear mounts 12 and 12 have Support pieces 15, 15 projecting from both sides of the transmission 3 are mounted via cushions 17.

In the figure, 18 is a transmission 3
, A cross member 19 for connecting the side members 4 and 4, 20 and 20 'to other universal joints, and a cross mark to indicate a welding point. With the above-described configuration, the transmission 3 is installed in the rear center of the vehicle, being separated from the engine 1 and the clutch 2, so that the conventional transmission system in which the engine 1 and the transmission 3 are integrally configured is provided. In addition, the vibration of the engine 1 is not transmitted to the clutch 2 and the transmission 3 and an amplified sound is not generated between them, so that the driver does not feel uncomfortable.

Further, since the total weight of the engine 1 and the transmission 3 is not loaded on the front wheels 9,
The weight load of the front wheels 9 can be reduced, and the weight load of the transmission 3 is hardly applied to the rear wheels 10, so that the load capacity of the luggage is not affected.

[0014]

As described in detail above, according to the power transmission device for a vehicle of the present invention, in a front engine / rear drive type vehicle having a long wheelbase, the transmission is separated from the engine rearward and the wheels are separated. Since it is installed in the middle part of the base and the clutch connected to the engine and the transmission are connected by a transmission mechanism such as a propeller shaft, the vibration of the engine is transmitted to the clutch and the transmission as in the conventional case. There is no danger of generating a high amplified sound due to mutual propagation of vibrations between the two, and there is an advantage that the weight load on the front wheels is reduced and the weight load on the rear wheels is almost zero.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a power transmission device for a vehicle according to the present invention.

FIG. 2 is a side view of a medium / heavy truck equipped with the present device.

FIG. 3 is a side view of a transmission mounting portion according to the present device.

FIG. 4 is a top view of FIG.

[Explanation of symbols]

 1 engine 2 clutch 3 transmission 4 frame (side member) 5,7 propeller shaft 6 differential gear 8 cab 9 front wheel 10 rear wheel 11 front transmission mount 12 rear transmission mount 13 support rods 14, 20, 20 'universal joint 14a derivation Part 15 Support piece 16, 17 Cushion 18 Power shift connection part 19 Cross member A Medium / heavy truck

Claims (1)

[Claims] 1. A front engine / rear drive type vehicle having a long wheel base, wherein a transmission is installed rearward of an engine in an intermediate portion of the wheel base, and a clutch connected to the engine and the transmission. A power transmission device for a vehicle, characterized in that and are connected by a transmission mechanism such as a propeller shaft.