JPH0116686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive system capable of four-wheel drive in which a transverse engine is disposed at the front of a vehicle body.

(Prior art) An example of a horizontal front engine is the
Publication No. 55-83119 and the patent application filed in 1983, which is the earlier application of this application.
There are some things disclosed in Japanese Patent Application Laid-open No. 154624, which is a publication of Japanese Patent Application Laid-Open No. 154624, but these are all related to front-wheel drive power transmission systems including front-wheel drive differentials of horizontal front engines. A rear wheel power transmission system such as a bevel gear mechanism is added to create a four-wheel drive system, and components such as a front-wheel drive differential are made common between the two-wheel drive system and the four-wheel drive system.

(Problems to be Solved by the Present Invention) In the above-mentioned conventional technology, it is possible to standardize components such as the front wheel drive differential, the gears of the power transmission system, and the output shaft. There is no standardization of cases that accommodate these. In other words, in the technologies described in both of the above-mentioned publications, the rear wheel drive gear, which is the input gear of the rear wheel drive gear series, is placed immediately after the front differential, so the basic configuration of the clutch housing is There was a problem with the addition of a rear wheel drive system, which turned into a completely different vehicle.

The present invention has been made in view of the above-mentioned problems of the conventional four-wheel drive drive system, and aims to make the power transmission system common between the four-wheel drive drive system and the two-wheel drive drive system. , an object of the present invention is to provide a drive device in which a housing for accommodating the drive device is also made common.

The present invention further provides a compact four-wheel drive drive device in which the basic configuration of the clutch housing does not require significant changes from the clutch housing for two-wheel drive disclosed in, for example, Japanese Utility Model Application Publication No. 55-83119. The purpose is to provide

(Structure of the Invention) The present invention, which solves the above-mentioned problems, includes a transversely mounted engine disposed at the front of the vehicle body, the torque of the transverse engine being input through a clutch, and the engine being disposed with its axial direction facing the lateral direction of the vehicle body. a transmission mechanism, a front differential for driving the front wheels driven by the output gear of the transmission mechanism, and a rear wheel driving gear coaxially arranged with the front differential. A drive device capable of four-wheel drive, which includes a bevel gear driven by a bevel gear, and a propeller shaft for driving rear wheels drivingly connected to the bevel gear, wherein an exterior case of the drive device includes a separately molded clutch and a rear wheel drive propeller shaft. The transmission case includes a clutch housing that accommodates the front differential, a transmission case that accommodates the transmission mechanism, and a transfer case that accommodates the rear wheel drive gear and the bevel gear. A side wall through hole is provided in both side walls of the front differential for inserting the output shaft on the center side in the left-right direction of the vehicle body, and a rear wall through hole is provided in the rear wall portion for inserting the gear shaft of the bevel gear extending in the longitudinal direction of the vehicle body. a hole is provided, and the transfer case is disposed on the engine side of the clutch housing, and at least a portion of the transfer case is located on the engine side of the portion of the clutch housing that accommodates the front differential. The clutch housing is fitted with an end face extending in the longitudinal direction of the vehicle body at the side, and one of the side wall through holes is aligned with the output shaft insertion hole, and bolted to the clutch housing, and the output shaft is inserted through the cylinder member that rotatably receives the clutch housing. The torque of the output gear is transmitted to the rear wheel drive gear in the transfer case through the hole and the side wall through hole.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. As shown in FIG. 1, a transmission 3 is attached to a horizontal engine 1 disposed at the front of a vehicle body (not shown) via a clutch 2. The clutch 2 includes a clutch accommodation chamber 8 that accommodates a clutch device 6 in a clutch housing 4, and a differential accommodation chamber 12 that accommodates a differential 10.
and. The transmission 3 includes a transmission gear mechanism 16 and a transmission output gear 18 housed in a transmission case 14.

A differential drive gear 22 that is attached to the differential gear case 20 and meshes with the transmission output gear 18 is arranged in the differential housing chamber 12 . Differential 10
left and right differential output shaft 24,2
6 are connected to left and right front wheel drive shafts 32 and 34 via left and right universal joints 28 and 30, respectively.

A transfer case 38 that accommodates a bevel gear mechanism 40 for driving the rear wheels is disposed on the side of the differential housing chamber 12 of the clutch housing 4 on the vehicle body center axis 36 side, very close to the rear of the transverse engine 1. .

The transfer case 38 is provided with left and right through holes 52 and 54 in the side wall portion 48 through which the right differential output shaft 26 and a cylindrical member 50 that rotatably receives the right differential output shaft 26 are inserted, and in the rear wall portion 58. A rear through hole 60 is provided through which the wheel drive propeller shaft 56 is inserted. On the other hand, an output shaft through hole 59 through which the right differential output shaft 26 passes is provided on the engine side of the front differential 10 accommodating portion of the clutch housing 4, that is, on the vehicle body center axis 36 side. The peripheral edge of the output shaft through hole 59 of the clutch housing 4 and the peripheral edge of the left through hole 52 of the transfer case 38 are configured to have end surfaces 59a and 52a, respectively, extending in the longitudinal direction of the vehicle body.

The transfer case 38 has its left through hole 52.
is the output shaft through hole 5 of the clutch housing 4.
9, and both end surfaces 59a
and 52a are adapted to be combined.

In this assembled state, the transfer case is attached to the clutch housing 4 by tightening the bolts 105. Therefore, unlike the above-mentioned conventional example, the rear half of the differential housing chamber of the clutch housing 4 does not have to undergo a major structural change in order to attach the transfer housing.

The cylindrical member 50 is the differential drive gear 22
is fixed to the clutch housing 4, is inserted through the output shaft insertion hole 59 of the clutch housing 4, and is inserted into the transfer case 3.
8, a rear wheel drive gear 61 is attached. Therefore, this cylindrical member 50 is an input gear of the rear wheel drive gear system in the transfer case 38, and is connected to the output gear on the rear wheel drive gear 61 coaxially arranged with the differential 10. 18 torques. The rear wheel drive gear 61 includes a rear wheel drive gear shaft 62 arranged parallel to the cylindrical member 50.
It meshes with a rear wheel drive intermediate gear 66 mounted through a clutch mechanism 64. Rear wheel drive gear shaft 6
2 is further fixed with a first bevel gear 68 for rear wheel drive, and the first bevel gear 68 for rear wheel drive meshes with a second bevel gear 70 for rear wheel drive that is integrated with the propeller shaft 56 for rear wheel drive.

As shown in FIG. 2, the clutch mechanism 64 can slide on a clutch gear 80, a synchronizer ring 82, a clutch output shaft gear 84, and the above three gears and rings provided on the rear wheel drive intermediate gear 66. It consists of a sleeve 86. sleeve 8
As shown in FIG. It is made to have a rocking motion in the center.

There is a recess 96 in the upper part of the yoke support shaft 94 and a spring 10 inserted into the clutch body 98.
0, the check ball 102 pressed against the yoke support shaft 94 falls into the recess 96.

The clutch mechanism 64 having the above configuration has the sleeve 8
6 is on the outer periphery of only the clutch output shaft gear 84, the rear wheel drive intermediate gear 66 and the rear wheel drive gear shaft 62 are not linked, and the rear wheels are not driven. On the other hand, when the operating arm 92 is operated manually or electrically, the switching yoke 90 swings, and the sleeve 8
6 is the clutch output shaft gear 84 and the clutch gear 80
When moving to the circumference of the rear wheel drive intermediate gear 6
6 and the rear wheel drive gear shaft 62 are rotated together to drive the rear wheels, resulting in four-wheel drive. Further, this state of the switching yoke 90 is maintained with a predetermined force by the action of the check ball 104.

(Effects of the Invention) According to the present invention, the transfer case is disposed on the side of the clutch housing on the engine side, and is attached to the clutch housing with one of the side wall through holes aligned with the output shaft insertion hole, and the output shaft is attached to the clutch housing. Since the torque of the transmission output gear is transmitted to the drive gear in the transfer case through the insertion hole and the side wall through hole by the rotatably received cylindrical member, the basic structure of the clutch housing is suitable for two-wheel drive. To obtain a drive device that does not require any major changes to the clutch housing of the 4-wheel drive drive device and the 2-wheel drive drive device, and has a common power transmission system, and also has a common clutch housing that accommodates them. be able to.

Furthermore, in the present invention, the transfer case is placed on the side of the clutch housing so that it wraps with the clutch housing in the longitudinal direction of the vehicle body, so the transfer case does not protrude much toward the rear of the vehicle body, making the entire device compact and capable of four-wheel drive. It is possible to obtain a drive device that is

[Brief explanation of drawings]

FIG. 1 is a plan view including a partial cross section of a drive device according to an embodiment of the present invention, FIG. 2 is an enlarged view of a clutch mechanism,
Figure 3 is a sectional view taken along the line - in Figure 2;
The figure is a perspective view of the portion shown in FIG. 3. 1...Horizontal engine, 2...Clutch, 3...Transmission, 4...Clutch housing, 6...
Clutch device, 8...Clutch accommodation chamber, 10...Differential, 12...Differential accommodation chamber, 14...Mission case, 16...Transmission gear mechanism, 18...Transmission output gear, 20...
Differential gear case, 24, 26... Differential output shaft, 38... Transfer case, 40... Bevel gear mechanism, 52, 54
...Side wall through hole, 64...Clutch mechanism.

Claims (1)

[Scope of Claims] 1. A transverse engine disposed at the front of the vehicle; a transmission mechanism to which the torque of the transverse engine is input via a clutch; a front wheel drive front differential driven by an output gear of a transmission mechanism; a bevel gear driven by the output gear via a rear wheel drive gear coaxially arranged with the front differential; A drive device capable of four-wheel drive having a rear wheel drive propeller shaft drivingly connected to a bevel gear, wherein an exterior case of the drive device accommodates the clutch and the front differential, each of which is molded separately. It is composed of a clutch housing, a transmission case that accommodates the transmission mechanism, and a transfer case that accommodates the rear wheel drive gear and the bevel gear. A side wall through hole is provided in the rear wall portion through which the output shaft on the center side in the left-right direction of the vehicle body of the differential is inserted, and a rear wall through hole is provided in the rear wall portion through which the gear shaft of the bevel gear extending in the vehicle body longitudinal direction is inserted. a transfer case is disposed on the engine-side side of the clutch housing, and at least a portion of the transfer case extends in the longitudinal direction of the vehicle body at the engine-side side of a portion of the clutch housing that accommodates the front differential. The clutch housing is bolted to the clutch housing with one of the side wall through holes aligned with the output shaft insertion hole, and the output shaft is passed through the insertion hole and the side wall through hole by a cylinder member that rotatably receives the output shaft. A drive device capable of four-wheel drive, characterized in that the torque of the output gear is transmitted to the rear wheel drive gear in the transfer case.