JPH0463726A - Power train structure for vehicle - Google Patents

Abstract

PURPOSE:To surely prevent the oscillation of a differential device due to reaction force by connecting the differential device to a fitting surface nearly orthogonal to the peripheral direction of a drive shaft, extending left and right from the differential device, out of strength members, positioned in the perimeter of the device, via a connecting member. CONSTITUTION:The input shaft side end part of a speed change gear 3 is connected to the rear end part of an engine 1, whose output shaft is extending in the fore and aft detection of a body, via a clutch 2, a transfer 4 is liked to the rear end part of the speed change gear 3, and a differential gear 5 is offertly arranged on the right side to the output shaft of the differential device 5 on the lower side part of the engine 1. In such a power train structure, the gear 5 is fixed by using a connecting member 11 having at least three faces seating on the right side surface of a cylinder block 1b of the engine1, the front end surface 2a of the clutch 2, and the upper surface of the differential gear 5 respectively. The front end surface 2a of the clutch 2 is used for a fitted surface nearly outhogonal to the peripheral direction of drive shafts 7R and 7L.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to the power train structure of a vehicle.

(Prior art) As a power train system that transmits the driving force of the engine to the differential device, the engine and transmission are connected in series, as seen in front-wheel drive vehicles, and the connection direction is in the longitudinal direction of the vehicle body. There are some that are vertically mounted, with the differential device placed on the side of the engine. Such a powertrain system usually further includes a transfer, and torque from the engine is transmitted to the differential device via the transmission, the transfer, and the propeller shaft. There is a growing tendency for such powertrain systems to be adopted in front-wheel drive one-box cars from the perspective of securing space for the driver's seat.

By the way, the differential device is quite heavy, so if the differential device is installed near the engine, in order to increase the rigidity of the entire powertrain system, it is necessary to install the differential device on the side of the engine's cylinder block or There are some that are connected to the side of the oil pan (JP-A-61-105218, JP-A-62-261529, JP-A-62-
(See Publication No. 292526).

(Problems to be Solved by the Invention) However, simply connecting the differential device to the side of the engine does not sufficiently ensure the rigidity of the power train system as a whole.

In particular, the differential device, due to torque reaction force,
Since the differential device tends to swing around the drive shaft extending left and right, the problem is how to prevent this swing.

The present invention was made in consideration of the above-mentioned circumstances, and
A vehicle that is of a vertical type in which the engine and transmission are connected in the front-rear direction of the vehicle body, and has a differential device installed on the side of the engine, in which rocking of the differential device caused by torque reaction force can be reliably prevented. The aim is to provide the same level of powertrain.

(Structure and operation of the invention) In order to achieve the above object, the present invention basically has the following structure. That is, a vehicle powertrain structure in which an engine and a transmission are connected in series and arranged vertically so that the connection direction is in the longitudinal direction of the vehicle body, and a differential device is disposed on the side of the engine. The differential device is connected via a connecting member to a mounting surface of a strength member located around the differential device that is substantially orthogonal to a circumferential direction of a drive shaft extending left and right from the differential device. The configuration is as follows.

The mounting surface may be the lower surface of the cylinder block of the engine, the lower surface of the transmission, or the engine-side end surface of a clutch or torque converter interposed between the engine and the transmission.

In addition to the mounting surface mentioned above, the differential device can be connected to multiple locations such as the side of the engine.
The two connecting members can be used to connect both the mounting surface and the engine.

(Effects of the Invention) As described above, according to the present invention, a differential device that is about to swing in response to a torque reaction force is connected to a mounting surface that is substantially orthogonal to the swinging direction. Therefore, the torque reaction force can be firmly received by this mounting surface, and rocking of the differential device can be reliably prevented.

(Example) Examples of the present invention will be described below based on the attached drawings. In addition, in the embodiment, a case is shown in which the power train system is mounted on the front part of the vehicle body and drives the front wheels.

In FIG. 1, ■ is an engine, 2 is a clutch, 3 is a transmission, 4 is a transfer, and 5 is a differential device.

The output shaft of the engine 1 extends in the longitudinal direction of the vehicle body, and the input shaft side end of the transmission 3 is connected to the rear end of the engine 1 via the clutch 2. The clutch 2 and the transmission 3 have a casing configured as a body, and a transfer 4 is provided at the rear end, that is, the output side end of the transmission 3.
are connected. The differential device 5 is disposed near the engine 1, more specifically, on the lower side of the engine 1, offset to the right with respect to its output shaft.

A propeller shaft 6 extends forward from the transfer 4, and engine driving force is input to the differential device 5 via the propeller shaft 6. A pair of left and right drive shafts 7L and 7R extend from the differential device 5 and are connected to a right or left front wheel (not shown).

The right drive shaft 7R is connected to the differential device 5 via a universal joint 8R. Further, the right end of a holding tube 9 that is located below the oil pan 1a of the engine 1 and extends in the left-right direction is fixed to the left end surface of the differential device 5, and the left drive shaft 7L is rotatable within this holding tube 9. is maintained. The left drive shaft 7L has a universal joint 8L on the outside of the holding tube 9, thereby forming a so-called left-right equal-length drive shaft to prevent torque steer.

The differential device 5 is connected to the engine l and the clutch 2 via a connecting member 1). This connecting member 1) has at least three surfaces that are seated on the right side surface of the cylinder block lb of the engine 1, the front end surface 2a of the clutch 2, and the upper surface of the differential device 5, respectively. Such a connecting member 1) is fixed to the cylinder block lb by a bolt 12, to the clutch 2 by a bolt 13, and to the differential device 5 by using a bolt 14 and a nut 15. The mounting surface that is substantially perpendicular to the circumferential direction of the drive shaft 7R17L corresponds to a surface that extends perpendicularly to the plane of the paper in FIG. 6, and the front end surface 2a of the clutch 2 corresponds to this mounting surface.

The connecting member 1) also serves as a bracket for attaching the engine 1 to the vehicle body. To explain this point in detail, 16 in Figure 3
R1) 6L is the left and right front frame, and these left and right front frames 16R and 16L are the first cross member 1.
They are connected by 7. Then, the arm-shaped portion protruding from the connecting member 1) connects to the first
It is attached to the cross member 17.

The differential device 5 is further connected to the left side surface of the cylinder block ib via a holding tube 9, as shown in FIG. That is, the holding tube 9
A bracket 19 is fixed to the left end of the cylinder block 1b by welding or bolts, while a bracket 20 is fixed to the cylinder block 1b, and both brackets 19 and 20 are connected via a ball joint 21. A bracket 20 fixed to the cylinder block lb is used to attach the engine to the vehicle body, and is attached to the first bracket through a rubber bushing 22.
It is attached to the cross member 17.

The differential device 5 is further connected to the oil pan la of the engine l, as shown in FIG. A hole IC is opened through which the tube 9 passes through in a liquid-tight manner.

In the above-described configuration, the differential device 5 that receives the driving torque from the engine 1 receives a torque reaction force that causes it to swing about the drive shaft 7R17L. However, this torque reaction force is effectively received by the front end surface 2a of the clutch 2, and rocking of the differential device 5 is reliably prevented. In addition, since the differential device 5 is connected to the engine 1 at multiple points other than the front end surface 2a, its rocking is further prevented.

FIGS. 4 and 5 show other embodiments of the present invention, and the same components as those in the previous embodiment are given the same reference numerals and their explanations are omitted. (Same for examples). In this embodiment, drive shaft 7R17
The mounting surface that is substantially orthogonal to the circumferential direction of L is the lower surface of the cylinder block lb. More specifically, a connecting member 31 that is held between the cylinder block 1b and the oil pan 1a is provided, a bracket portion 31a that is seated on the upper surface of the differential device 5 is formed on the connecting member 31, and the bracket is 31a and the differential device 5 are fixed with bolts.

FIG. 6 shows yet another embodiment of the invention. In this embodiment, the lower surface of the transmission 3 is the mounting surface that is substantially perpendicular to the circumferential direction of the drive shaft 7R17L.

That is, the front end of the connecting member 41 extending in the longitudinal direction is bolted to the differential device 5, while the rear end of the connecting member 41 is bolted to the lower surface of the transmission 3. In this embodiment, the differential device 5 further utilizes the connecting member 42 to connect the front end surface of the clutch 2 to the
a, and further connected to a vehicle body mounting bracket 44 for the engine l via a rubber bush or ball joint 43.

Although the embodiments have been described above, the power train system according to the present invention can also be applied to a system mounted on the rear of the vehicle body to drive the rear wheels (for mid-engine vehicles, for rear engine-rear drive vehicles). . Moreover, instead of the clutch 2, a torque converter may be used.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention.
The figure is an overall perspective view of the power train system, Figure 2 is an exploded perspective view of the main parts of Figure 1, and Figure 3 is a front view of the power train in Figure 1. 4 and 5 show other embodiments of the present invention, in which FIG. 4 is a perspective view of a main part, and FIG. 5 is a perspective view of a connecting member used in FIG. 4. FIG. 6 is a simplified side view showing still another embodiment of the present invention. 1: Engine 2: Clutch 3 - Transmission 4: Transfer 5: Differential device 6: Propeller shaft 7R, 7L drive shaft 9: Holding tube 1): Connecting member 31: Connecting member 41: Connecting member 42: Connecting member Figure 1 Figure 5 Figure 6

Claims (6)

[Claims] (1) A power train for a vehicle in which an engine and a transmission are connected in series and arranged vertically so that the connection direction is in the longitudinal direction of the vehicle body, and a differential device is disposed on the side of the engine. In the structure, the differential device is connected via a connecting member to a mounting surface of a strength member located around the differential device that is substantially perpendicular to the circumferential direction of a drive shaft extending left and right from the differential device. A vehicle powertrain structure characterized by: (2) In claim 1, the engine and the transmission are connected via a clutch or a torque converter, and the mounting surface is an engine-side end surface of the clutch or torque converter. (3) In claim 1, The mounting surface is the lower surface of the transmission. (4) Claim 1, wherein the mounting surface is a lower surface of a cylinder block of the engine. (5) Any one of claims 1 to 4
In 1., the differential device is further connected to the engine in addition to the mounting surface. (6) Claim 2, wherein the differential device is also connected to the engine by the connecting member.