WO2000010830A1

WO2000010830A1 - Driving force transmission device for vehicle

Info

Publication number: WO2000010830A1
Application number: PCT/JP1999/003768
Authority: WO
Inventors: Makoto Nishiji; Hirofumi Okuda
Original assignee: Zexel Corporation
Priority date: 1998-08-21
Filing date: 1999-07-12
Publication date: 2000-03-02
Also published as: JP2000062487A

Abstract

A driving force transmission device for vehicle, wherein a center differential gear (3) is disposed downstream from an output shaft (2a) of an automatic transmission (2), the output shaft (2a) of the automatic transmission (2) is coupled to a housing (3a) of the center differential gear (3) through gears (G6, G7), one side gear (3c) of the center differential gear (3) is coupled to a front drive gear shaft (5) through gears (G8, G9), and the other side gear (3d) of the center differential gear (3) is coupled directly to a propeller shaft (7).

Description

Description Vehicle driving force transmission device Technical field

The present invention relates to a driving force transmission device for a vehicle, and more particularly to a driving force transmission device for an automatic vehicle. Background art

Generally, this type of driving force transmission device includes an engine, an automatic transmission, and a center differential arranged sequentially from the front to the rear of the vehicle. The engine, automatic transmission, and center differential are arranged so that their axes are aligned with each other.

The rotational driving force of the engine is transmitted to the automatic transmission via the torque converter, and is transmitted from the automatic transmission to the center differential housing. The rotational driving force transmitted to the housing is transmitted to a pair of side gears via a planet gear. The driving force transmitted to one side gear is transmitted to the front differential via the front drive shaft, and transmitted from the front differential to the left and right front wheels. The driving force transmitted to the other side gear is transmitted to Lyadeff via the propeller shaft, and is transmitted to the left and right rear wheels from the Lyadev.

In the conventional driving force transmission device described above, three gears are interposed between one side gear of the center differential and the front drive shaft, and two gears are interposed between the other side gear and the propeller shaft. I have. This is for the following reason. That is, in a normal vehicle, when the front drive shaft is rotated counterclockwise as viewed from the rear of the vehicle (hereinafter, the rotation direction means the rotation direction when the vehicle is viewed from the rear). The vehicle is designed to move forward.

On the other hand, in the conventional driving force transmission device described above, the output shaft of the automatic transmission is directly connected to the housing of the center differential, and the side gear of the center differential rotates in the same direction as the automatic transmission. Here, the rotation direction of the automatic transmission is the same as the rotation direction of the engine, and is counterclockwise when the vehicle moves forward. Therefore, the side gear rotation direction Is counterclockwise and identical to the front drive shaft. Therefore, when connecting the side gear and the front drive shaft, it is only necessary to directly connect each other or to interpose three (or an odd number of more) gears between them.

However, there is an automatic transmission on the axis of the side gear (center differential). For this reason, the front drive shaft cannot be arranged on the axis of the center differential, and cannot be directly connected to the side gear. Therefore, by interposing three gears between the side gear and the front drive shaft, the front drive shaft is shifted to the left or right by the amount of the three gears from the center differential axis to avoid the automatic transmission. In addition to being able to be placed on the side, the front drive shaft is rotated in the same direction as the side gear.

In a normal vehicle, the propeller shaft is designed to rotate clockwise when the vehicle moves forward. However, the center differential side gear rotates counterclockwise as described above. Therefore, two gears are interposed between the side gear and the propeller shaft.

In the conventional driving force transmission device described above, three gears are arranged between one side gear and the front drive shaft, and two gears are arranged between the other side gear and the propeller shaft. Five gears are used. When such a large number of gears are used, there is a problem that the loss of the transmitted rotational driving force increases and the noise increases.

Although the output shaft of the automatic transmission is directly connected to the center differential housing as the input shaft, the input shaft is not directly connected to the housing in a normal differential gear device, but is connected via gears. You. For this reason, a normal differential gear cannot be used as the center differential, and a differential gear dedicated to the center differential must be used. In addition, there is a problem that the dedicated differential gear device is difficult to manufacture. An object of the present invention is to provide a vehicle driving force transmission device that can reduce the number of gears required for transmitting rotational driving force and that can use a normal differential gear device as a center differential. And Disclosure of the invention According to the present invention, an engine, an automatic transmission, and a center differential are sequentially arranged from the front to the rear of the vehicle, and the rotational driving force input from the engine to the housing of the center differential via the automatic transmission is transmitted from the housing to the planetary gear. In a vehicle driving force transmission device that transmits to a pair of side gears via gears, transmits from one side gear to the front differential via a front drive shaft, and transmits from the other side gear to Ryadeff via a propeller shaft. The center differential is disposed below the output shaft of the automatic transmission, and the output shaft of the automatic transmission and the housing of the center differential are connected via two gears. One side gear and the front drive shaft are connected via two gears, and the other side of the center differential is used. It is characterized in that directly connected with the gear and the propeller shafts and. As a result, the number of gears can be reduced, and a normal differential gear device can be used as a center differential. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view showing a schematic configuration of a preferred embodiment of a driving force transmission device according to the present invention. FIG. 2 is a view taken along an arrow X--X in FIG. The figure is a view taken in the direction of the arrow Y in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below with reference to FIGS. The driving force transmission device according to this embodiment includes an engine 1, an automatic transmission 2, and a center differential 3, which are sequentially arranged from the front side to the rear side of the vehicle. The engine 1 and the automatic transmission 2 are arranged so that their axes are aligned with each other and are oriented horizontally. Therefore, the output shaft 1a of the engine 1 and the output shaft 2a of the automatic transmission 2 are aligned with each other. The center differential 3 has its axis aligned with the axis of the automatic transmission 2 in the horizontal direction of the vehicle, but is offset from the axis of the automatic transmission 2 in the vertical direction. The axis of the center differential 3 is shifted downward with respect to the axis of the automatic transmission 2.

The rotational driving force of the engine 1 is transmitted via its output shaft 1a and the torque converter 4 The output is input to the automatic transmission 2 and is input from the output shaft 2 a of the automatic transmission 2 to the housing 3 a of the center differential 3. Two gears G _e and G ₇ are interposed between the output shaft 2 a and the housing 3 a. Therefore, the housing 3a of the center differential 3 rotates in the opposite direction to the output shaft 1a of the engine 1 and the output shaft 2a of the automatic transmission 2. Now, assuming that the output shafts 1a and 2a of the engine 1 and the automatic transmission 2 rotate counterclockwise when the vehicle advances, the housing 3a rotates clockwise. The direction of rotation is opposite to the direction of rotation of the housing of the center differential housing of the conventional driving force transmission device.

The rotation of the housing 3a is transmitted to the pair of side gears 3c and 3d via the planet gear 3b. The rotation direction of the pair of side gears 3c, 3d is the same as that of the housing 3a, and rotates clockwise when the vehicle moves forward.

The rotational driving force transmitted to one side gear 3 c is transmitted to the front drive shaft 5. Two gears G ₈ and G ₉ are interposed between the side gear 3 c and the front drive shaft 5. Therefore, the front drive shaft 5 rotates in the opposite direction to the side gear 3c, and the direction of rotation is the same as the direction of rotation of the front drive shaft of the conventional rotary driving force transmission device. That is, if the engine 1 is rotating counterclockwise when the vehicle advances, the front drive shaft 5 also rotates counterclockwise. Further, since the two gear G _8, G ₉ between the front drive shaft 5 and rhinoceros Dogiya 3 c is interposed, shifted in the direction of Zureka have left the front drive shaft 5 from the axis of the center differential 3 be able to. In this embodiment, the vehicle is shifted to the right as viewed from the rear of the vehicle, whereby the front drive shaft 5 is controlled by the control unit 2 b having the automatic transmission 2 and a control valve (not shown) for controlling the same. To the right of them.

The driving force transmitted to the front drive shaft 5 is Haipoi Dogiya HG _1; is transmitted to the front differential 6 via the HG _2, it is transmitted from the front differential 6 on the front wheels FW ₂ left and right. The front wheels FW _{2 and} FW ₂ rotate in a direction to move the vehicle forward if the engine 1 is rotating counterclockwise.

As described above, the side gear 3d rotates clockwise when the vehicle advances, which is the same direction in which the propeller shaft 7 should rotate when the vehicle advances. Therefore, the propeller shaft 7 and the side gear 3d are directly connected without any intervening gear. Here, in the present invention, "directly connecting two members (for example, the side gear 3d and the propeller shaft 7) to which the rotation is transmitted" means that one member is connected without a gear, a chain, or the like. Connecting two members so that rotation can be transmitted to the other member as substantially the same rotation, with a coupling C, universal joint, or other connecting member interposed between the two members Including cases.

In FIG. 1, the gear G ₆ is he drawing is offset to the right of the vehicle with respect to the gear G _7, FIG. 2, as is apparent from FIG. 3, it is actually directly above the gear G ₇ It is located in. Similarly, in FIG. 2, the force diagram 1 the gear G _s is depicted in the lower side of the gear G _8, as shown in FIG. 3, is actually that are horizontally oriented left of the gear G _s.

In the driving force transmission device having the above configuration, only four gears G _{6 to} G _S are arranged on the transmission path from the automatic transmission 2 to the front drive shaft 5 and the propeller shaft 7 via the center differential 3. The number of gears can be reduced by one compared to a conventional rotation transmission device that requires five gears. Therefore, the loss of the rotational driving force and the noise can be reduced accordingly.

In addition, since the housing 3 of the center differential 3 is rotationally driven through the force S and the gear G ₇ provided on the housing 3, a normal differential gear device similar to the front differential 6 and the rear differential 8 is used as the center differential 3. be able to.

Note that the present invention is not limited to the above embodiment, and can be appropriately modified.

For example, in the above-described embodiment, as the center differential 3, the front differential 6, and the ryade 8, an open differential using side gears 3c and 3d made of bevel gears and a planet gear 3b is adopted. However, a so-called torque sensing differential using a pair of side gears composed of helical gears and a planet gear composed of at least one pair of helical gears meshing with and engaging with a pair of side gears. May be adopted. In this case, the torque sensing differential may be a parallel shaft type in which a pair of planet gears are arranged in parallel with the side gears. It may be an orthogonal shaft type that is arranged in the direction orthogonal to the side gear.

Claims

The scope of the claims

1. The engine, the automatic transmission, and the center differential are sequentially arranged from the front to the rear of the vehicle, and the rotational driving force input from the engine to the center differential housing via the automatic transmission is transmitted from the housing via the planet gears. In the vehicle driving force transmission device, the transmission power is transmitted to a pair of side gears, transmitted from one side gear to a front differential via a front drive shaft, and transmitted from the other side gear to a rear differential via a propeller shaft. The differential is disposed below the output shaft of the automatic transmission, and the output shaft of the automatic transmission and the housing of the center differential are connected via two gears. The front drive shaft is connected to the other side gear of the center differential via two gears. Driving force transmitting apparatus for a vehicle, characterized in that directly connected to the propeller shaft.