JP3304582B2 - Power transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device,
In particular, the present invention relates to a power transmission device in which a connection flange is slidably mounted on an output shaft and restricts slide movement of the connection flange.

[0002]

2. Description of the Related Art Vehicles such as automobiles, ie, front-wheel drive internal combustion engine rear-wheel drive (FR-2WD), front-wheel drive internal-combustion engine four-wheel drive (FR-4WD, FF-4WD), and midship internal-combustion engine four-wheel drive (MR-WD) For example, the driving force of the internal combustion engine, which is a driving force generating means mounted in a front-wheel-drive internal combustion engine rear wheel drive (FR-2WD) type vehicle in the 4WD) system,
The gears are converted into desired torque and rotation speed by a transmission as a speed change means, taken out, and transmitted to left and right wheels by a differential gear via a propeller shaft to drive the wheels.

[0003] As the power transmission device, Japanese Patent Laid-Open No. 4-1 is disclosed.
There is one disclosed in Japanese Patent No. 5317. The spline coupling mechanism disclosed in this publication is a spline coupling mechanism in a power transmission system that transmits a rotational force to a rotating shaft via a spline coupling, wherein a spline portion having a spline on an outer peripheral surface of the shaft is fitted with the spline portion. The spline portion having a spline on the inner peripheral surface is fastened in a state where a tensile force is applied in the axial direction by a bolt via an elastic body, so that the resonance point amplitude of the shaft lateral vibration can be reduced without depending on external damping. In addition, the resonance frequency can be easily adjusted and moved.

[0004] There is also one disclosed in Japanese Utility Model Publication No. 4-49376. A power transmission device disclosed in this publication includes a power transmission mechanism having an output shaft rotatably supported in a housing and having one end protruding outward from an opening provided in the housing, and an output shaft provided at one end. And a power transmission shaft having a yoke shaft connected to the power transmission device, wherein the output shaft is hollow, and the yoke shaft is internally fitted inside the power transmission shaft, and both of them have respective inner peripheral surfaces. And splines formed on the outer peripheral surface,
An oil seal that is in sliding contact with the outer peripheral surface of the output shaft is mounted on the opening of the housing, and one end of the yoke shaft is fixed to the yoke shaft and the other end extends toward the opening of the housing. A dust cover is provided to cover the mounting portion from the outside, and a seal member for preventing dust intrusion is mounted between the outer circumferential surface of the output shaft on the yoke shaft side of the sliding portion of the oil seal and the dust cover. The oil seal mounted on the projecting portion of the output shaft in the housing of the transmission mechanism is prevented from sliding in the rotation direction and the axial direction at the same time, improving the durability of the oil seal and improving the oil seal mounting portion and the output. Foreign matter is prevented from entering the spline fitting portion between the shaft and the yoke shaft.

[0005]

By the way, in a conventional power transmission device, for example, a power transmission device of a four-wheeled vehicle, generally, the driving force of the internal combustion engine, which is the driving force generating means, is desired by the transmission, which is the transmission means. To the torque and speed of
It is transmitted to a final reduction gear (hereinafter, referred to as “final”) via a propeller shaft.

[0006] The suspension system including the final (hereinafter referred to as "suspension") has an independent or non-independent structure. In the former independent structure, the transmission and the final are formed of an elastic body (rubber mount). However, the relative position changes due to vibrations at the time of starting or running on uneven roads, and a structure for absorbing the change in position is required.

The latter non-independent structure, like the former independent structure, requires a structure for absorbing a change in the relative position, and also requires a sliding movement in the vehicle longitudinal direction due to the movement of the suspension. It needed to be absorbed.

Here, the structure of the conventional power transmission device will be described. As shown in FIG.
And a joint yoke 124 of the joint 122 are spline-fitted, and some have a slidable structure.

However, in a vehicle, especially a four-wheel drive vehicle, the spline fitting portion is often below the lubricating oil level, so that lubrication cannot be performed except after assembly, and the propeller shaft At the time of attachment and detachment, it is necessary to remove the oil, making maintenance and inspection work difficult, which is disadvantageous in practical use.

Further, as shown in FIG. 7, there is a transmission having a spline structure which is provided with a connection flange 220 on an output shaft 216 of a transmission 206 and is slidable on a propeller shaft 208. That is, the connection flange 220
Has one end in contact with the bearing 234, and the other end of the nut 2
It is fixed to the output shaft 216 by tightening at 18. At this time, the oil is shut off at the end surface on the bearing 234 side and does not flow out.

However, the provision of the slide structure at the intermediate portion of the propeller shaft complicates the structure of the propeller shaft itself, making it difficult to manufacture, increasing the cost, and is economically disadvantageous. Has an inconvenience in terms of vibration due to an increase in the weight of the intermediate portion. And
For example, if the structure is slidable by changing the length of the flange, oil will pass through the gap between the spline tooth surfaces created to allow sliding, and will flow out to the outside, causing problems such as burning due to reduced oil. Is caused.

Further, as shown in FIG. 8, there is a transmission in which a connection flange 320 is provided on an output shaft 316 of a transmission 306, and a joint 322 having a sliding structure is provided at an end of a propeller shaft 308.

However, a joint having a slide structure is expensive due to its complicated structure and difficulty in manufacturing, and is economically disadvantageous due to high cost.

The limitation of the slide amount in the above three conventional examples is performed as follows. That is, in the first conventional example, the entrance side is limited by the joint yoke end face and the bearing, the joint yoke, and the case portion of the transmission, and the exit side is not restricted. In the second conventional example, the entry side is restricted by the shift yoke end face of the propeller shaft and the shaft main body, and the exit side is not restricted.
In the third conventional example, both the entry side and the exit side are limited by a joint structure such as contact with a ball or an inner / outer shaft.

As a result, in the first conventional example, it is considered that a thrust impact at a bearing portion, an influence on a low rigidity cover between the transmission and the transmission cover, and a defect due to relative rotation are considered. In the second conventional example, there is no restriction on the outlet side, and there is a risk of falling off. Further, when the restriction on the outlet side is added, the structure becomes complicated, the production is difficult, the cost becomes large, and it is economically disadvantageous.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a speed change means connected to a driving force generating means and mounts a connection flange on an output shaft of the speed change means by a fixing tool. In a power transmission device in which a propeller shaft is connected to the connection flange via a joint, an output shaft is mounted via a bearing in a case portion of the transmission means, and the connection flange is slid around the output shaft outer periphery. A structure in which the maximum sliding amount of the connection flange with respect to the case portion with respect to the case portion is regulated by one end of the fixture, and the maximum slide amount of the connection side is regulated with the other end of the fixture and a joint. It is characterized by having. Further, in a power transmission device in which a speed change means connected to the driving force generating means is provided and a connection flange is attached to an output shaft of the speed change means by a fixing tool, and the propeller shaft is connected to the connection flange via a joint, An output shaft is mounted via a bearing in a case portion of the transmission means, and the connection flange is slidably mounted on the outer periphery of the output shaft, and an oil seal portion is mounted on an inner hole of the connection flange. And a small diameter portion with which the oil seal portion abuts is formed at an end of the output shaft.

[0017]

According to the invention described above, when the vehicle equipped with the driving force generating means starts or travels on an uneven road, the maximum amount of sliding of the connection flange with respect to the case due to the generated vibration is measured at one end of the fixture. In addition to the restriction, the maximum slide amount on the entry side is restricted by the other end of the fixture and the joint, and the restriction is made in a portion where there is no relative rotation, thereby improving the reliability of the components.

Further, when the vehicle equipped with the driving force generating means starts or runs on an uneven road, oil is prevented from flowing out by the oil seal portion, and the reliability of the oil seal portion is improved by only sliding movement.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. In FIG. 2, 2 is a front-wheel-drive internal combustion engine rear-wheel drive (FR-2WD) type vehicle, 4 is an internal combustion engine that is a driving force generating unit, 6 is a transmission that is a transmission unit, 8 is a propeller shaft, and 10 is a differential gear. , 12 are front wheels and 14 is rear wheels.

The vehicle 2 has an internal combustion engine 4 mounted between front wheels 12 on the front side, a transmission 6 mounted on the internal combustion engine 4, and one end of a propeller shaft 8 connected to an output shaft 16 of the transmission 6. At the same time, the other end is connected to a differential gear 10 disposed on the rear side, and the rear wheel 14 is driven.

A connection flange 20 is mounted on the output shaft 16 of the transmission 6 by a fixture 18 comprising a nut, and one end of the propeller shaft 8 is connected to the connection flange 20 via a joint 22.

That is, as shown in FIG. 1, the joint yoke 24 of the joint 22 is
And a shift yoke 30 which is one end of the propeller shaft 8 is connected via a spider 28 of the joint 22.

The output shaft 16 is mounted in the case 32 of the transmission 6 via a bearing 34, and the connection flange 20 is slidably mounted on the output shaft 16 and provided. Case part 3 of flange 20
The maximum sliding amount on the outgoing side with respect to 2 is regulated by one end of the fixture 18, and the maximum sliding amount on the ingress side is regulated by the other end of the fixture 18 and the joint 22.

An oil seal 38 is attached to an inner hole (see FIG. 1) of the connection flange 20 and provided at an end of the output shaft 16 with a small diameter portion 36 with which the oil seal 38 abuts. To form

More specifically, as shown in FIG.
A small-diameter portion 36 is formed by performing a polishing operation in the vicinity of the other end, which is the end of the connecting portion, and an oil seal portion 38 is arranged in the connection flange 20, that is, between the outer periphery of the small-diameter portion 36 and the inner hole that is the inner periphery of the connection flange 20. Set up.

A threaded portion 40 is formed at the other end of the output shaft 16, and the fixture 18 is screwed to the threaded portion 40 via a washer 42.

The possible range of the sliding movement is a gap A generated between the connection flange 20 and the washer 42 on the output side, and between the end of the output shaft 16 and the shift yoke 30 of the propeller shaft 8 on the input side. And a gap B.

Next, the operation will be described.

At the time of starting or traveling on an uneven road, vibrations are generated, and the vibrations cause the transmission 6 and the differential gear 1.
The relative position of 0 slightly changes.

At this time, changes in the relative positions of the transmission 6 and the differential gear 10 due to vibration are caused by the gap A generated between the connection flange 20 and the washer 42 and the output shaft 1.
It is absorbed by the possible range of the sliding movement consisting of the six ends and the gap B generated between the shift yoke 30 of the propeller shaft 8.

As a result, the function of regulating the sliding amount of the connecting flange and the sliding function of the output shaft 16 can be added without greatly changing the conventional structure, so that the production becomes easy and the cost can be reduced. In addition to being economically advantageous, it is possible to sufficiently cope with a small sliding amount such as an independently suspended vehicle, which is advantageous in terms of cost.

In addition to adding a slide movement function to the output shaft 16 of the transmission 6 and allowing oil to be filled by the oil seal portion 38, productivity can be improved and maintenance / inspection can be improved. Are better.

Further, the small diameter portion 36 and the oil seal portion 3
8 is only added to the conventional one, so that the processing steps can be substantially the same as the conventional one.
This is practically advantageous because the number of processing steps does not increase.

Furthermore, since the sliding movement can be restricted on the entrance side and the exit side of the connection flange 20, a high rigidity can be ensured and a relative rotation does not occur, thereby improving the reliability. Can be done.

It should be noted that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the embodiment of the present invention, the vehicle 2 of the front-end internal combustion engine rear wheel drive (FR-2WD) system is used.
The vehicle 50, 60 of the front-mounted internal combustion engine four-wheel drive (FR-4WD, FF-4WD) type as shown in FIGS. 3 and 4 and the midship internal-combustion engine four-wheel drive (MR-4WD) as shown in FIG. ) Type vehicle 70. In other words, the front internal combustion engine rear wheel drive (FR-2
This is because the configuration of the connection flange and the joint portion in the WD) type vehicle can be used as it is.

[0038]

As described in detail above, according to the present invention, there is provided a speed change means connected to the driving force generating means, and a connection flange is mounted on an output shaft of the speed change means by a fixing tool. In a power transmission device in which a propeller shaft is connected via a joint, an output shaft is mounted via a bearing in a case portion of a transmission means, and a connection flange is slidably mounted on the outer periphery of the output shaft. Since the maximum slide amount of the connection flange with respect to the case part is regulated by one end of the fixture, the maximum slide amount of the entrance side is regulated by the other end of the fixture and the joint, greatly changing the conventional structure. Without the function of regulating the slide amount of the connection flange and the slide function on the output shaft, the production becomes easy,
The cost can be reduced, which is economically advantageous. In addition, since the sliding movement can be restricted on the entrance side and the exit side of the connection flange, high rigidity can be ensured, and a portion where relative rotation does not occur can improve reliability.

Power transmission means is provided with speed change means connected to the driving force generating means, and a connection flange is mounted on an output shaft of the speed change means by a fixing tool, and a propeller shaft is connected to the connection flange via a joint. In the device, an output shaft is mounted via a bearing in a case portion of the transmission means, and a connection flange is slidably mounted around the output shaft, and an oil seal portion is provided in an inner hole of the connection flange. In addition to mounting and providing, the output shaft has a small-diameter portion at the end where the oil seal abuts.Therefore, the function to regulate the sliding amount of the connection flange and the output shaft without greatly changing the conventional structure. The slide function can be added, the production becomes easy, the cost can be reduced, and it is economically advantageous. Further, by adding a slide movement function to the output shaft of the transmission means and enabling oil filling by the oil seal portion, productivity can be improved and maintenance and inspection properties are excellent. Further, by the structure only adding the small diameter portion and the oil seal portion to the conventional one,
The processing steps can be substantially the same as those of the conventional one, and the number of processing steps is not increased, which is practically advantageous. Furthermore, since the slide movement can be restricted on the entrance side and the exit side of the connection flange, high rigidity can be ensured, and a portion where relative rotation does not occur can improve reliability.

[Brief description of the drawings]

FIG. 1 is a schematic enlarged sectional view of a power transmission device showing an embodiment of the present invention.

FIG. 2 is a schematic plan view of a front internal combustion engine rear wheel drive (FR-2WD) type vehicle.

FIG. 3 is a schematic plan view of a front-mounted internal combustion engine four-wheel drive (FR-4WD) type vehicle showing another first embodiment of the present invention.

FIG. 4 is a schematic plan view of a front-mounted internal combustion engine four-wheel drive (FF-4WD) type vehicle showing another second embodiment of the present invention.

FIG. 5 is a schematic plan view of a vehicle of a four-wheel drive (MR-4WD) system of a midship internal combustion engine showing a third embodiment of the present invention.

FIG. 6 is a schematic enlarged sectional view of a power transmission device showing a first prior art of the present invention.

FIG. 7 is a schematic enlarged sectional view of a power transmission device showing a second conventional technique of the present invention.

FIG. 8 is a schematic enlarged sectional view of a power transmission device showing a third conventional technique of the present invention.

[Explanation of symbols]

Reference Signs List 2 Front internal combustion engine rear wheel drive (FR-2WD) type vehicle 4 Internal combustion engine 6 Transmission 8 Propeller shaft 10 Differential gear 12 Front wheel 14 Rear wheel 16 Output shaft 18 Fixture 20 Connection flange 22 Joint 32 Case part 34 Bearing 36 Small diameter part 38 Oil seal part 42 Washer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 3/06 F16D 1/06

Claims (2)

(57) [Claims] 1. A connection flange mounted by a fixture to the output shaft of the speed change means provided with a shift means for coupling the driving force generating means, the power transmission coupled to the propeller shaft via a joint to the connecting flange In the apparatus, an output shaft is mounted via a bearing in a case portion of the transmission means, and the connection flange is slidably mounted on an outer periphery of the output shaft and provided.
Set the maximum slide amount on the delivery side to the case
At the end, the maximum slide amount on the entry side is fixed as described above.
A power transmission device characterized in that it is configured to be restricted by the other end of the tool and a joint . Wherein the connection flange is attached by a fixture to the output shaft of the speed change means provided with a shift means for coupling the driving force generating means, the power transmission coupled to the propeller shaft via a joint to the connecting flange In the apparatus, an output shaft is mounted via a bearing in a case portion of the transmission means, and the connection flange is slidably mounted on an outer periphery of the output shaft, and is provided inside the connection flange.
A power transmission device , wherein an oil seal portion is mounted on the hole and a small-diameter portion is formed at an end of the output shaft with which the oil seal portion abuts .