JPH02258422A - Power transmitting device for vehicle - Google Patents

Abstract

PURPOSE:To sharply lower the whole height of a power train and facilitate its layout by vertically offsetting the input shaft of a transmission against the output shaft of an engine, and inserting a power transmitting means between them. CONSTITUTION:A crank shaft 18 which is the output shaft of an engine 4 and the input shaft 19 of a transmission are vertically offset-arranged by the preset distance (d). The preset distance (d) is set to a value so that the lower end section of a clutch housing 20 of a clutch device 6 is arranged at the same position as the lower end face of the engine 4. The power is transmitted from the crank shaft 18 to the input shaft 19 via an offset unit 5. The offset unit 5 is constituted of an input shaft 21 coaxial with the crank shaft 18, an output shaft 22 coaxial with the input shaft 19, and a counter shaft 23 arranged in the middle of them and at the position offset in the width direction by the preset distance (e) from them.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power transmission device for a vehicle, and in particular, reduces the total height of the power train and increases the degree of freedom in its layout in the vehicle height direction. The present invention relates to a power transmission device for a vehicle.

[Prior Art 1] The following improvements have been required for cab-over vehicles.

■Increasing the cargo space (especially front and rear length) ■Lowering the doorway to make it easier for the driver to get in and out ■Distributing the load to the rear wheels to improve braking performance Increasing the ratio ■Increasing the degree of freedom in the layout of the cooling system in order to improve the cooling performance of cooling systems such as radiators.As a response to these requests for improvement, the power train should be placed between the wheel spaces. This increases the load distribution ratio to the rear wheels, secures sufficient space for the cooling system in front of the power train, and increases cargo space by placing the power train under the flat floor. One possible method would be to expand the area and lower the position of the entrance/exit. However, the overall height of conventional powertrains is quite high, making it impossible to place them under a flat floor. Therefore, a power train has been proposed in which the height of the engine is reduced by arranging the engine at an angle in the width direction, thereby reducing the overall height (hereinafter referred to as "lower overall height").

[Problems to be Solved by the Invention] In this conventional power train, as shown in FIG. They are arranged at an angle in the width direction.

Therefore, as schematically shown in FIG. 6, the engine 1
01, the upper end portion 104 is lowered and the lower end portion 1 is lower than the engine 101' which is not arranged inclined.
05 is higher, and the height of the engine 101 is reduced.

However, as shown in FIG. 5 again, in the conventional powertrain P, the engine output shaft 106 and the transmission input shaft 107 are arranged on the same axis (for example, see Utility Model Application No. 194850/1983). ). At the connection part with the engine 101, the substantially cone-shaped clutch housing 102a having a fairly large substantially ring-shaped end surface is disposed substantially coaxially with the transmission input shaft 107, so that the engine-side end surface of the clutch housing 102a is connected to the transmission. Input shaft 107
The axial center of the (engine output shaft 106) will protrude toward the surroundings, and of course it will also protrude significantly downward. Therefore, by arranging the engine 101 obliquely, the lower end portion of the clutch housing 102a protrudes considerably downward from the engine lower end surface 105, even if the position of the engine lower end surface 105 becomes higher.

Therefore, as shown in FIG. 6, the position of the lower end of the power train P as a whole is almost the same as when the engine is not tilted, and the overall height is reduced by the lower height of the engine upper end surface 104. It is only reduced. Therefore, the total height of the power train P is not much different from the total height of a power train without an inclined engine, and there is a problem that the total height cannot be made sufficiently low.

For this reason, in a cab-over vehicle, even if the engine is arranged at an angle, it is extremely difficult to arrange the power train under a flat floor between the wheelbases.

In addition, a so-called dry sump type engine has also been proposed, which reduces the height of the oil pan by installing an oil tank to store lubricating oil and quickly transporting the oil flowing into the oil pan to the oil tank. , this case also has the same problem as above.

The present invention was made in view of the above-mentioned conventional problems, and it is possible to significantly reduce the total height of the power train. For example, in a cab-over vehicle, the power train is placed on a flat floor between the wheel bases. It is an object of the present invention to provide a power transmission device for a vehicle that can be easily arranged on the lower side.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a vehicle equipped with a transmission that changes the speed of the torque of the engine output shaft and transmits it to the wheels. A power transmission device for a vehicle is provided, characterized in that it is provided with a power transmission means that is arranged offset with respect to a shaft and transmits power from an engine output shaft to a transmission input shaft.

[Operations and Effects of the Invention J According to the present invention, since the transmission input shaft and the engine output shaft are arranged offset, the transmission input shaft is arranged at a higher position than the engine output shaft, and the clutch housing or The arrangement position of the transmission can be raised relative to the engine. Therefore, in a power train in which the engine is arranged at an angle, by arranging the transmission input shaft at a position such that the lower end of the clutch housing almost coincides with the lower end surface of the engine at the connection part with the engine, the lower end surface of the engine can be adjusted. It is possible to eliminate the clutch housing from protruding downward. Therefore, when the engine is arranged so as to be inclined in the width direction, the total height of the power train is reduced by the amount that the total height of the engine is reduced.

Therefore, it is possible to achieve a sufficiently low total height of the power train, and for example, in a cab-over vehicle, the power train can be easily placed under the flat floor between the wheel bases, and the various improvement requests mentioned above can be achieved. be able to respond effectively to

Note that power is transmitted from the engine output shaft to the transmission input shaft via a power transmission means.

[Example] Examples of the present invention will be specifically described below.

As shown in FIG. 3, the power train PT of the cab-over vehicle (bongo vehicle) is arranged below a flat floor 3 between the front wheels 1 and the rear wheels 2 (between the wheel bases). Therefore, sufficient space for a cooling system (not shown) is secured in front of the power train PT, and the space above the floor 3 is wide.

Furthermore, since it is not possible to achieve a sufficiently low overall height with conventional powertrains, the upper end surface of the engine 4 degrees protrudes above the flat floor 3 position, and the floor 3'' is shaped like a step, as shown by the imaginary line. Must.

The power train PT is provided with, in order from the front side, an engine 4, an offset unit 5, which will be explained in detail later, a clutch device 6, and a transmission 7. Then, the torque of the engine 4 is transmitted to the transmission 7 via the offset unit 5 and the clutch device 6, and after being torque-converted by the transmission 7 according to the shift position, the torque is sequentially transmitted to the propeller shaft 8 and the differential device 9. The power is transmitted to the rear wheels 2 via the rear axle shaft 11.

As shown in FIG. 4, the engine 4 has an outer shape formed by a cylinder head 13, a cylinder block 14, and an oil pan 15. In order to reduce its height,
It is arranged to be inclined by a predetermined angle σ in the width direction of the engine 4. Furthermore, the oil pan 15 is made smaller by using a dry sump. In this way, the height of the engine 4 is reduced.

As shown in FIG. 1, the crankshaft 18 and the transmission input shaft 1
9 is arranged vertically offset by a distance d. Note that both axes 18 and 19 are not offset in the width direction. The offset amount d is set to such a value that the lower end of the clutch housing 20 of the clutch device 6 (offset unit 5) is arranged at approximately the same position as the lower end surface of the engine 4 in the vertical direction. Therefore, the lower end of the clutch housing 20 (offset unit 5) does not protrude below the lower end surface of the engine 4, so by arranging the engine 4 at an angle and making the oil pan 15 a dry sump, the engine 4
The total height of the power train PT is reduced by the increased height of the lower end surface. It goes without saying that the overall height of the power train PT is also reduced by the fact that the upper end surface of the engine 4 is lowered due to the inclined arrangement of the engine 4.

The crankshafts 1 are arranged offset from each other.
Power is transmitted from the transmission input shaft 8 to the transmission input shaft 19 via the offset unit 5. The offset unit 5 is provided with an input shaft 21 coaxially connected to the crankshaft I8, and an output shaft 22 arranged on the same axis as the transmission input shaft 19. Furthermore, a countershaft 23 is provided at a position approximately midway between both shafts 21.22 in the vertical direction and offset by a distance e from both shafts 21.22 in the engine width direction (see FIG. 2). Each of these shafts 21, 22, 23 is rotatably supported by a bearing 24, 24, 24, respectively.

As shown in FIG. 2, an input shaft 21, an output shaft 22, and a counter shaft 23 each have an input gear 2.
5, an output gear 26, and a counter gear 27 are attached, the input gear 25 meshes with the counter gear 27, and the counter gear 27 meshes with the output gear 26. Therefore, the torque of the input shaft 21 is transmitted to the output shaft 26 via the countershaft 23.

As shown in FIG. 1 again, a relatively small-diameter flywheel 31 is attached to the input shaft 21 on the front side of the input gear 25 in order to stabilize fluctuations in the angular velocity of the engine 4.
is provided. This flywheel 31 has gears 25, 26.
7. Prevents rattling or noise from occurring.

Further, a disk-shaped plate member 33 is attached to the rear end of the output shaft 22 coaxially therewith.

A clutch disc 34 is provided on the rear side of this great member 33 so as to have the same axis as this, and the front curved surface of this clutch disc 34 faces the wide rear side surface of the plate member 33. It is located in A clutch facing 35 made of a friction material is attached to the outer periphery of the clutch disc 34. Further, the clutch disc 34 is spline-fitted to a spline portion 37 of the transmission input shaft 19 via a clutch hub 36 attached to its inner circumference, so that the clutch disc 34 always rotates together with the transmission input shaft 19. There is.

When the clutch pedal (not shown) is not depressed (clutch on), the biasing member (not shown)
The clutch disc 34 is pressed toward the plate member 33, thereby frictionally engaging the clutch facing 35 and the plate member 33, so that the output shaft 22 and the transmission input shaft 19 rotate together.

On the other hand, when the clutch pedal is depressed (clutch off), the clutch disc 34 is displaced to the side opposite to the plate member 33 by a coupling mechanism (not shown), and the clutch facing 35 and the plate member 33 are accordingly displaced. The frictional engagement between the output shaft 22 and the transmission input shaft 19 is released, and torque transmission from the output shaft 22 to the transmission input shaft 19 is cut off.

In the above configuration, the engine 4 is tilted in the width direction,
Furthermore, since the oil pan 15 (see FIG. 4) is of a dry sump type with a low height, the height of the engine 4 is reduced. Since the transmission input shaft 19 is arranged to be offset upwardly with respect to the crankshaft 18, the lower end of the offset unit 5 or the clutch housing 20 is aligned with the engine 4 (oil pan 15) in the vertical direction.
), and does not protrude below the lower end surface of the engine 4. Therefore, the total height of the power train PT can be reduced by the amount of reduction in the height of the engine 4 due to the inclined arrangement of the engine 4 and the dry sump configuration of the oil pan 15.

For this reason, as mentioned above, the power train PT is
It can be placed under a flat floor 3 between the front wheels and the rear wheels 2.

[Brief explanation of drawings]

FIG. 1 is an explanatory longitudinal cross-sectional view of an offset unit and a clutch device provided in a power transmission device according to the present invention. FIG. 2 is a diagram showing the arrangement of the input can shaft, output shaft, and counter shaft of the offset unit in FIG. 1. FIG. 3 is an explanatory side view of a power transmission groove of a cab-over vehicle equipped with a power transmission device according to the present invention. FIG. 4 is an explanatory front view of the engine shown in FIG. FIG. 5 is a side view of a conventional power train in which an engine is arranged at an angle. FIG. 6 is a diagram showing a tilted state of the engine shown in FIG. 5. PT...Power train, l...Front wheel, 2...Rear wheel, 3...Floor, 4...Engine, 5...Offset unit, 6...Clutch device, 7... Transmission, 15... Oil pan, 18... Crankshaft, 1
9... Transmission input shaft, 21... Input shaft, 22
...Output shaft, 23...Counter gear shaft, 2
5...Input gear, 26...Output gear, 27...Counter gear.

Claims (1)

[Claims] (1) In a vehicle equipped with a transmission that changes the speed of the torque of the engine output shaft and transmits it to the wheels, the transmission input shaft is arranged offset from the engine output shaft, and the power of the engine output shaft is A power transmission device for a vehicle, comprising a power transmission means for transmitting power to a transmission input shaft.