JPH051442Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to an axle for a driving wheel of an automobile.

BACKGROUND TECHNOLOGY In a front-engine, front-drive vehicle (hereinafter referred to as a FF vehicle), the driving force of the engine is transmitted to the drive axle via a transmission and a differential gear.
This driving torque is transmitted from the front hub to the front wheels. The front hub is pivotally supported by a front knuckle via a bearing, and the front knuckle is attached to the vehicle body via a front suspension. Further, the drive axle was formed of a solid shaft.

Problems that the invention aims to solve: Due to variations in the manufacturing precision of transmission gears and differential gears, vibrations in transmission gears, particularly meshing vibrations in differential gears, occur when a car is running, and this vibration is transmitted to the drive axle. ,
Additionally, there was a problem where the noise was transmitted to the vehicle body via the front hub and front suspension, causing an unpleasant sound to be heard by passengers. In particular, when the speed of the vehicle, that is, the rotational speed of the drive axle, is near the natural frequency of the torsional vibration of the drive system, the drive system resonates, and this vibration is transmitted to the vehicle body via the front suspension, etc., causing discomfort. It became sound and vibration.

Means for Solving the Problems The present invention was devised in order to solve the above-mentioned problems, and includes a cylindrical hollow part that is open at least at both ends, and the axes of the hollow parts are aligned, and one of the hollow parts is aligned with the other. a connecting member having a spline-shaped first engagement portion formed on an inner circumferential surface of the hollow portion and a spline-shaped second engagement portion formed on the other inner circumference surface of the hollow portion; A spline-shaped first engaged portion is formed which loosely fits into the first engaging portion of the connecting member and is engaged with the first engaging portion via an elastic body, and the other end thereof is connected to the wheel side. A first shaft member, and a spline-shaped second engaged portion that loosely fits into the second engaging portion of the connecting member and is engaged with the second engaging portion via an elastic body is provided at one end of the first shaft member. The object of the present invention is to provide a drive axle for an automobile characterized in that the second shaft member has a second shaft member and the other end thereof is connected to a power source.

Effect According to the present invention, the driving torque from the engine which is the power source is transmitted to the second shaft member of the drive axle via the transmission etc. The coupling portion transmits the torque to the spline-shaped second engagement portion of the coupling member via the elastic body, and further transmits the torque from the spline-shaped first engagement portion of the coupling member to the first shaft member via the elastic body. The drive torque is transmitted to the spline-shaped first engaged portion of the drive axle, and thus the drive torque is transmitted from the first shaft member of the drive axle to the wheel side. That is, the driving torque from the engine applied to the driving axle is transmitted to the wheels via the elastic body. Further, the inertial mass of the connecting member and the spring characteristics of the elastic body act on the vibration of the drive system as a mass-spring vibration system.

Embodiment Next, an embodiment of the present invention will be specifically described based on FIGS. 1 to 4.

2 is a drive axle for FF vehicles that has constant velocity joints 4 and 6 connected to both ends;
The side is connected to the front wheels via a front hub (not shown), and the constant velocity joint 6 side is connected to the transmission and engine via a differential gear (not shown). 8
is a connecting member in which a penetrating hollow part 9 is formed, and a spline-shaped engagement part 1 is formed on the inner surface of the hollow part 9.
0 is provided passing through the hollow part 9, and the engaging part 10
has five convex teeth 11. Reference numeral 12 denotes a first shaft member connected to the constant velocity joint 4, and the center end thereof is inserted into the hollow part 9 of the connecting member 8, and corresponds to the engaging part 10 at one end of the connecting member 8. A spline-shaped first engaged part 16 that loosely fits into the first engaging part 10a is formed, and the first engaged part 1
6 has five convex teeth 16a. When the first engaged portion 16 is inserted and loosely fitted into the first engaging portion 10a, the interval between the convex teeth 16a and the convex teeth 11 is set to a desired dimension. There is. A second shaft member 20 is connected to the constant velocity joint 6, and its central end is inserted into the hollow part 9 of the connecting member 8, and corresponds to the engaging part 10 at the other end of the connecting member 8. A spline-shaped second engaged portion 22 that loosely fits into the second engaging portion 10b is formed,
The second engaged portion 22 has five convex teeth 22a. When the second engaged portion 22 is inserted and loosely fitted into the second engaging portion 10b, the interval between the convex teeth 22a and the convex teeth 11 is set to a desired dimension. There is. 24 is the first engaging portion 10a and the first
Rubber that is closely interposed between the engaged portion 16 and between the second engaged portion 10b and the second engaged portion 22, and is Joint part 10
a and the first engaged portion 16 so as not to come into direct contact with each other,
In addition, the second engaging portion 10b and the second engaged portion 22 are arranged so as not to come into direct contact with each other.

Note that the convex teeth 16a and the convex teeth 11 in the first engaging portion 10a mesh with each other via rubber 24, and the convex teeth 22a and the convex teeth 11 in the second engaging portion 10b are engaged with each other through rubber. They are engaged through 24.

The rubber 24 is bonded to the engaging portions 10a, 10b and the engaged portions 16, 22 by vulcanization or adhesive.

In the above embodiment, driving torque is transmitted from the engine (not shown) to the transmission and differential gear (both not shown).
When the force is transmitted to the second engaged portion 22 of the drive axle 2 via the force, the convex teeth 22a transmit the force to the convex teeth 11 of the second engaging portion 10b while compressing the rubber 24. Therefore, the driving torque is transmitted to the connecting member 8. Further, this torque is transmitted from the convex teeth 11 of the first engaging portion 10a of the connecting member 8 to the convex teeth 16a of the first engaged portion 16 via the rubber 24, and thus It is transmitted from the shaft member 12 via the constant velocity joint 4 to the front hub and front wheels (not shown).

According to the above embodiment, when the meshing vibration of the differential gear or transmission gear is transmitted to the drive axle 2 in the form of torsional vibration, the vibration is attenuated by the rubber 24, so that the vibration is not transmitted to the first shaft member 12. Vibrations are reduced. Furthermore, by selecting the inertial mass of the connecting member 8 and the spring constant of the rubber 24, it is possible to reduce high-frequency vibrations in the drive system, and it is also possible to shift the resonance frequency of the drive system at a specific vehicle speed. be. Therefore, gear vibrations are not transmitted to the vehicle body via the front hub, front suspension, etc., and unpleasant gear noise can be effectively eliminated. It is also possible to reduce vibrations in the drive system caused by torque fluctuations other than gear vibrations.
This has the effect of eliminating unpleasant vibrations and noise for passengers. Furthermore, when a car starts, etc., a large torque is applied to the drive axle 2, but the convex teeth 22a
The force is transmitted to the convex teeth 11 through the first engaging portion 1
Since the convex tooth 11 at 0a transmits force to the convex tooth 16a via the rubber 24, a considerable compressive force is applied to the rubber 24, but the shearing force and tensile force are small, so the rubber 24 (rubber 24 and the engaging part 10
a, 10b, and the engaging portions with the engaged portions 16 and 22), sufficient strength and durability can be ensured.

In the above embodiment, each convex tooth 11, 16a, 2
2a has five pieces, but any number can be used.

In the above embodiment, it is assumed that the convex tooth 11 and the convex tooth 16a or 22a engage, but the part between the teeth is regarded as a concave groove, and the convex tooth 16a or 22a engages. It may be considered that the concave grooves engage with each other with a gap (interval). In other words, the spline-shaped engaging part and the engaged part have two or more convex teeth in a well-balanced manner with respect to the drive axle axis. , means that either the engaging portion or the engaged portion has a concave groove so that the other of the engaging portion and the engaged portion engages with the convex tooth with a gap (interval) therebetween.

Further, in the above embodiment, the rubber 24 is formed as a single piece, but it is divided into three parts corresponding to the first engaged part 16, the second engaged part 22, and an intermediate part thereof. It may be made of rubber. Also,
The rubber 24 may be press-fitted into the engaging portion and the engaged portion instead of being glued.

Furthermore, soft plastics other than rubber may be used as the elastic body.

Further, in the above embodiment, the hollow portion 9 of the connecting member 8
Although it passes through, it is also possible to make the vicinity of the center of the connecting member 8 solid without penetrating it. in this case,
Open cylindrical hollow parts will be formed at both ends, but if the axes of the hollow parts coincide, the first
The number of convex teeth etc. of the engaging portion 10a and the second engaging portion 10b may be different. Furthermore, since the elastic body is divided into two pieces, their characteristics may be made different.

Furthermore, the present invention can be applied to drive axles of FR vehicles as well as FF vehicles.

In addition to drive axles, drive systems such as propulsion shafts,
Alternatively, the present invention may be applied to drive systems of vehicles other than automobiles, industrial machines, machine tools, etc.

Effects of the invention According to the invention, the drive axle has an elastic body coupling structure, and drive torque is transmitted through the elastic body, so torsion due to meshing vibration of differential gears and transmission gears, etc. Not only can vibrations be attenuated, but also high-frequency vibrations of the drive system can be significantly reduced by selecting the inertial mass of the connecting member and the spring characteristics of the elastic body.

Therefore, it is possible to eliminate unpleasant vibrations and noise caused by the drive system that is transmitted to the vehicle body via the suspension and the like.

In addition, since the spline-shaped first engaging part and the first engaged part, and the spline-shaped second engaging part and the second engaged part are engaged with each other through the elastic bodies, when the car starts Even when a large torque is applied, such as when a large torque is applied, no severe load is applied to the elastic body, which has the effect of ensuring sufficient strength and durability of the elastic body.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, Fig. 3 is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 4 is an enlarged sectional view taken along the line - FIG. 6 is an enlarged cross-sectional view of the connecting member 8 of the example. 2... Drive axle, 8... Connection member, 10a...
First engaging part, 10b... Second engaging part, 9... Hollow part, 12... First shaft member, 16... First engaged part, 20... Second shaft member, 22... Second engaged portion, 24...elastic body.

Claims (1)

[Scope of utility model registration request] A cylindrical hollow part that is open at least at both ends is formed, the axes of the hollow part coincide with each other, and a spline-shaped first engaging part is provided on the inner peripheral surface of one of the hollow parts, and a connecting member having a spline-shaped second engaging portion formed on its inner circumferential surface; and a connecting member having one end that loosely fits into the first engaging portion of the connecting member and engages with the first engaging portion via an elastic body. A spline-shaped first engaged part is formed, the other end of which is connected to the wheel side, and one end of which is loosely fitted into the second engaging part of the connecting member and has an elastic body. A spline-shaped second engaged portion is provided to be engaged with the second engaging portion through the second engaging portion, and the other end thereof is provided with a second shaft member connected to the power source side. Automotive drive axle.