WO2005100812A1

WO2005100812A1 - Dustproof connection structure of rotating shaft

Info

Publication number: WO2005100812A1
Application number: PCT/JP2005/000207
Authority: WO
Inventors: Motohiko Sato
Original assignee: Aichi Machine Industry Co., Ltd.
Priority date: 2004-03-30
Filing date: 2005-01-12
Publication date: 2005-10-27
Also published as: JP2005282711A

Abstract

A dustproof connection structure of a rotating shaft capable of securely seal a housing and preventing a seal from being ruptured. In the structure, an output shaft (3) is connected to a transmission shaft (4) so as to be movable in the axial direction and locked so as not to be rotated relative to each other. A sealing member (9) is interposed at the inside portion of the shaft hole part (2) of the housing (1) between the inner peripheral surface of the shaft hole part (2) and the outer peripheral surface of the transmission shaft (4). A dustproof member (11) is interposed at the outside portion of the shaft hole part (2) between the inner peripheral surface of the shaft hole part (2) and the outer peripheral surface of the transmission shaft (4).

Description

Specification

Dustproof connection structure of rotating shaft

Technical field

The present invention relates to a dustproof connection structure of a rotating shaft mainly used for a transmission of an automobile.

Background art

Conventionally, as a connection structure between an output shaft and a transmission shaft of an automobile transmission, as shown in FIG. 3, a shaft hole 2P is provided in an extension housing 1P of a transmission, and the shaft hole 2P is provided in the shaft hole 2P. In general, there is provided a connection structure in which a main shaft 3P as an output shaft is housed, and a propeller shaft 4P as a transmission shaft is externally fitted and connected to the main shaft 3P. A connection hole 5P for inserting the main shaft 3P is provided at the tip of the propeller shaft 4P, and a spline groove 6P is recessed on the inner peripheral surface of the connection hole 5P. On the outer peripheral surface of the 3P, a spline strip 7P is provided in a protruding manner, and by engaging the spline groove 6P with the spline strip 7P, the main shaft 3P and the propeller shaft 4P can slide in the axial direction. And the mutual rotation is fixed. At the outer end of the shaft hole 2P of the extension housing 1P, an oil seal 9P is interposed between the inner peripheral surface of the shaft hole 2P and the outer peripheral surface of the propeller shaft 4P. This prevents the gear oil in the extension housing 1P from leaking outside (see Non-Patent Document 1).

[0003] Non-Patent Document 1: "New Car Manual (R33-1) NISSAN Skyline R33 Model Vehicle Material Code F006716" Nissan Motor Co., Ltd. Service Engineering Dept. Technical Section Edited and Published, August 1993, No. C-4 Page

Disclosure of the invention

Problems to be solved by the invention

[0004] However, in the above-described conventional configuration, when the propeller shaft 4P slides toward the main shaft 3P, dust attached to the outer peripheral surface of the propeller shaft 4P comes into contact with the oil seal 9P. In addition, there is a problem that the oil seal 9P may be damaged and the gear oil in the extension housing 1P may leak to the outside. [0005] Therefore, as shown in Fig. 4, a dust lip 11P protruded rearward (substantially horizontally with respect to the axial direction) from the outer peripheral surface of the outer end portion of the extension no. It is also conceivable that dust or muddy water adhering to the outer peripheral surface of the propeller shaft 4P is removed by the elastic pressure of the blade portion 22P of the dust lip IIP to prevent the oil seal 9P from being damaged. However, in this case, if the length of the blade portion 22P of the dust lip I IP is set smaller than the sliding amount of the propeller shaft 4P, when the propeller shaft 4P slides toward the main shaft 3P, the dust lip is reduced. Dust not removed by the blade portion 22P of the IP may come in contact with the oil seal 9P and damage the oil seal 9P.Therefore, it is extremely difficult to shorten the blade portion 22P of the dust lip I IP. There was a problem that it was difficult. If the blade portion 22P of the dust lip I IP is long, the elastic pressure of the blade portion 22P is reduced, and dust and muddy water adhered to the outer peripheral surface of the propeller shaft 4P are sufficiently removed. There was a problem that it was not possible. When a drain hole 12P for discharging dust and muddy water accumulated inside the dust lip IIP is provided, the drain hole 12P is located at the lowermost position and is attached to the housing 1P. It is necessary to provide the positioning protrusion 23P as a mark on the dust lip I IP, and there is a problem that the design of the dust lip I IP is complicated and the manufacturing cost is increased. Further, since it is necessary to assemble the dust lip I IP with the positioning projection 23P as a mark and assembling the housing 1P, the number of steps of the assembling work increases and the assemblability deteriorates. Was. Furthermore, since the sliding amount of the propeller shaft 4P varies depending on the type of product (automobile), it is necessary to prepare dust lip I IPs of blades of various lengths according to the sliding amount of the propeller shaft 4P. However, there is a problem in that it is difficult to make parts common to the dust lip I IP.

Means for solving the problem

[0006] As a means for solving the above-mentioned conventional problems, the present invention provides a first rotating shaft 3 housed in a housing 1 and a first rotating shaft 3 provided coaxially with the first rotating shaft 3. A second rotary shaft 4 connected to the shaft 3 so as to be slidable in the axial direction and fixed to each other in a mutually rotating manner, wherein the first rotary shaft 3 and / or Alternatively, at an inner portion of the shaft hole 2 of the housing 1 on which the second rotary shaft 4 is supported, A sealing member 9 is interposed between the surface and the outer peripheral surface of the second rotating shaft 4, and at the outer portion of the shaft hole 2, the inner peripheral surface of the shaft hole 2 and the second The present invention provides a dustproof connection structure of the rotating shaft with a dustproof member 11 interposed between the rotating shaft 4 and the outer peripheral surface. It is desirable that a discharge portion 12 be provided between the inner portion and the outer portion of the shaft hole portion 2 of the housing 1. The distance S between the inner portion and the outer portion of the shaft hole 2 of the housing 1 is at least an amount corresponding to the axial sliding amount of the second rotating shaft 4 with respect to the first rotating shaft 3. It is desirable to set to. Further, it is desirable that the sealing member 9 is provided with a sealing portion 16 and a dustproof portion 17. Further, it is desirable that the dustproof member 11 is protruded from the inner peripheral surface of the shaft hole 2 substantially perpendicularly to the axial direction. Preferably, the housing is a housing 1 of a transmission, the first rotating shaft is an output shaft 3 of the transmission, and the second rotating shaft is a drive shaft or a transmission shaft 4.

The invention's effect

In the dustproof connection structure of the rotating shaft according to the present invention, the sealing is provided between the inner peripheral surface of the shaft hole portion 2 and the outer peripheral surface of the second rotating shaft 4 in the inner portion of the shaft hole portion 2 of the housing 1. The stopper 1 seals the housing 1 to prevent the liquid in the housing 1 from leaking to the outside, and the second rotating shaft 4 is connected to the first rotating shaft 3. When sliding, the dustproof member 11 interposed between the inner peripheral surface of the shaft hole portion 2 and the outer peripheral surface of the second rotary shaft 4 at the outer portion of the shaft hole portion 2. In addition, dust adhering to the outer peripheral surface of the second rotating shaft 4 can be removed, and it is possible to prevent the dust from contacting the sealing member 9 and damaging the sealing member 9. In this case, if a discharge portion 12 is provided between the inner portion and the outer portion of the shaft hole portion 2 of the housing 1, dust and mud accumulated in the shaft hole portion 2 of the housing 1 are removed by the discharge portion. It can be discharged from 12 to the outside. In addition, since it is not necessary to provide a positioning part in the dustproof member 11, the design of the dustproof member 11 can be simplified, the manufacturing cost can be reduced, and the dustproof member 11 can be removed without any positioning work. Since 11 can be assembled to the housing 1, the man-hour for assembling work is reduced and the assemblability is improved. Further, the distance S between the inner portion and the outer portion of the shaft hole 2 of the housing 1 is set to at least an amount corresponding to the sliding amount of the second rotating shaft 4 in the axial direction with respect to the first rotating shaft 3. If set, the second rotation axis 4 is relative to the first rotation axis 3 When sliding, dust adhered to the outer peripheral surface of the second rotating shaft 4 does not come into contact with the sealing member 9 and the sealing member 9 can be reliably prevented from being damaged. . Furthermore, even when the amount of sliding of the second rotating shaft 4 with respect to the first rotating shaft 3 in the axial direction is various, the components of the dustproof member 11 can be prepared by preparing only one type of dustproof member 11. Common use is possible, and part manageability is improved. Furthermore, if the sealing member 9 is provided with a sealing portion 16 and a dustproof portion 17, the sealing portion 16 of the sealing member 9 prevents the liquid in the housing 1 from leaking to the outside. In addition, dust that cannot be removed by the dustproof member 11 can be removed by the dustproof portion 17 of the sealing member 9. Furthermore, if the dust-proof member 11 is extended substantially perpendicularly to the axial direction from the inner peripheral surface of the shaft hole 2, the dust-proof member 11 is shortened, and the elastic pressure force of the dust-proof member 11 is reduced. And the dust attached to the outer peripheral surface of the second rotating shaft 4 can be sufficiently removed.

Brief Description of Drawings

FIG. 1 is an explanatory side sectional view of a dustproof connection structure of a rotating shaft according to the present invention.

FIG. 2 is an explanatory side sectional view of a sealing member and a dustproof member of the present invention.

FIG. 3 is an explanatory side sectional view of a conventional connection structure of a rotating shaft.

FIG. 4 is an explanatory side sectional view of a dustproof connection structure of a rotating shaft related to a conventional example.

Explanation of symbols

[0009] 1 housing (extension housing) 2 shaft hole (shaft hole) 3 first rotating shaft (main shaft) 4 second rotating shaft (propeller shaft) 9 sealing member (oil seal) 11 dustproof member (da) Strip) 12 Drainage part (drain hole) 16 Seal part (Seal part) 17 Dustproof part (Blade part)

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described with reference to an embodiment shown in FIGS. 1 and 2. As shown in FIG. 1, a shaft hole 2 serving as a shaft hole is provided at a rear end of an extension housing 1 of an automobile transmission serving as a housing (transmission housing). A main shaft 3 of a transmission, which is a first rotating shaft (output shaft), is rotatably supported and housed therein, and the main shaft 3 has a propeller shaft, which is a second rotating shaft (transmission shaft). 4 is coaxial Are externally fitted and connected. A drive shaft (not shown) (rear wheel axle) is connected to the propeller shaft 4, and a drive member (not shown) is connected to the drive shaft (rear wheel axle).

(Rear wheel) is connected.

In the present embodiment, a connection hole 5 for inserting the main shaft 3 is provided at the tip of the propeller shaft 4, and a spline strip 6 is formed on an inner peripheral surface of the connection hole 5. A spline groove 7 is formed in the outer peripheral surface of the main shaft 3 so that the main shaft 3 and the propeller shaft 4 can be engaged with each other by engaging the spline groove 6 with the spline groove 7. Are slidable in the axial direction, and their mutual rotation is fixed.

An inner step 8 is formed inside the shaft hole 2 of the extension housing 1, and an inner peripheral surface of the inner step 8 of the shaft hole 2 and an outer peripheral surface of the propeller shaft 4 are formed. An annular oil seal 9 as a sealing member is interposed between and.

Further, an outer step portion 10 is formed in an outer portion of the shaft hole 2 of the extension housing 1, and an inner peripheral surface of the outer step portion 10 of the shaft hole 2 and an outer peripheral surface of the propeller shaft 4 are formed. An annular dust lip 11 serving as a dust-proof member is interposed between the two.

In this embodiment, the distance S between the mounting position of the oil seal 9 on the inner step 8 of the shaft hole 2 and the mounting position of the dust lip 11 on the outer step 10 is at least the main shaft 3 of the propeller shaft 4. Is set to an amount corresponding to the sliding amount in the axial direction with respect to.

Further, a drain hole 12 serving as a discharge portion is provided at the lowermost portion of the outer step portion 10 between the inner portion and the outer portion of the shaft hole 2 of the extension housing 1.

As shown in FIG. 2, the oil seal 9 includes an annular metal plate 14 having a horizontal mounting portion 13 on the outer periphery, and an annular rubber plate 15 attached to the annular metal plate 14. A seal portion 16 as a sealing portion is provided on an inner portion of the inner periphery of the annular rubber plate 15, and a blade portion 17 as a dustproof portion is provided on an outer portion of the inner periphery of the annular rubber plate 15. A metal ring 18 is attached to the outer periphery of the seal portion 16. The oil seal 9 is attached to the inner peripheral surface of the inner step portion 8 of the shaft hole 2 via the horizontal attachment portion 13 of the annular metal plate 14, and the seal portion 16 of the annular rubber plate 15 and the blade portion The inner peripheral surface of the shaft 17 is pressed sexually against the outer peripheral surface of the propeller shaft 4. The dust lip 11 includes an annular metal plate 20 having a horizontal mounting portion 19 on the outer periphery, and an annular rubber plate 21 attached to the annular metal plate 20. A blade section 22 is provided. The dust lip 11 is connected to the outside of the shaft hole 2 through the horizontal mounting portion 19 of the annular metal plate 20.

It is attached to the inner peripheral surface of the step 10. The blade portion 22 of the annular rubber plate 21 extends substantially perpendicularly to the axial direction from the inner peripheral surface of the outer step portion 10 of the shaft hole 2, and the inner peripheral surface of the blade portion 22 The propeller shaft 4 is sexually pressed against the outer peripheral surface.

In the above-described dustproof connection structure, the extension housing 1 is interposed between the inner peripheral surface of the inner step 8 of the shaft hole 2 and the outer peripheral surface of the propeller shaft 4 in the inner portion of the shaft hole 2. The oil seal 9 seals the extension housing 1 to prevent the lubricating oil in the extension housing 1 from leaking to the outside. When the propeller shaft 4 slides axially toward the main shaft 3, the inner peripheral surface of the outer step portion 10 of the shaft hole 2 and the outer peripheral surface of the propeller shaft 4 With the blade portion 22 of the dust lip 11 interposed between the oil seal 9 and the dust seal, the dust adhering to the outer peripheral surface of the propeller shaft 4 can be removed. Thus, the oil seal 9 can be prevented from being damaged.

In the present embodiment, since the drain hole 12 is provided between the inner portion and the outer portion of the shaft hole 2 of the extension housing 1, the water is collected in the shaft hole 2 of the extension housing 1. Dust and muddy water can be discharged from the drain hole 12 to the outside. Further, since it is not necessary to provide a positioning portion on the dust lip 11, the design of the dust lip 11 can be simplified, the manufacturing cost of the dust lip 11 can be reduced, and the positioning operation can be performed. Since the dust lip 11 can be assembled to the outer step portion 10 of the shaft hole 2 without performing, the man-hour for the assembling operation is reduced, and the assembling property is improved.

Further, the distance between the mounting position of the oil seal 9 on the inner step 8 of the shaft hole 2 and the mounting position of the dust strip 11 on the outer step 10 S force at least the main shaft of the propeller shaft 4 Since it is set to the amount corresponding to the sliding amount in the axial direction with respect to 3, the dust adhering to the outer peripheral surface of the propeller shaft 4 when sliding toward the propeller shaft 4 The oil seal 9 that does not come into contact with the oil seal 9 can be reliably prevented from being damaged. Furthermore, even if the sliding amount of the propeller shaft 4 varies depending on the type of product (automobile), it is possible to use only one type of dust lip 11 and to share the components of the dust lip 11 and to manage parts. The performance is improved.

Further, a seal portion 16 is provided on an inner portion of the inner periphery of the oil seal 9, and a blade portion 17 is provided on an outer portion of the inner periphery of the oil seal 9. The lubricating oil in the extension housing 1 can be prevented from leaking to the outside by the seal portion 16 of 9 and the blade portion 17 of the dust lip 11 can be prevented by the blade portion 17 of the oil seal 9. It is possible to remove dust and dust that cannot be completely removed.

Furthermore, since the blade portion 22 of the dust lip 11 is inserted substantially perpendicularly to the axial direction from the inner peripheral surface of the outer step portion 10 of the shaft hole 2, the dust lip 11 is By reducing the length, the elastic pressure of the blade portion 22 of the dust lip 11 can be increased, and dust adhered to the outer peripheral surface of the propeller shaft 4 can be sufficiently removed.

As described above, the embodiments of the present invention have been described by way of examples. However, the scope of the present invention is not limited to these, but may be changed or modified according to the purpose within the scope described in the claims. It is possible. For example, in the dustproof connection structure of the rotating shaft according to the present embodiment, a connecting hole 5 for inserting the first rotating shaft 3 is provided at the tip of the second rotating shaft 4, and the inner periphery of the connecting hole 5 is provided. A spline groove 6 is formed on the surface of the first rotating shaft 3 and a spline groove 7 is formed in the outer peripheral surface of the first rotating shaft 3 so that the spline groove 6 and the spline groove 7 are engaged with each other. The rotation shaft 4 of the first rotation shaft 3 is slidable in the axial direction with respect to the first rotation shaft 3 and the rotation thereof is fixed to each other. A connection hole (not shown) for receiving the rotary shaft 4 is provided, and a spline strip (not shown) is protruded on the inner peripheral surface of the connection hole. A spline groove (not shown) is formed in the outer peripheral surface of the shaft, and the spline groove and the spline groove are engaged with each other, whereby the second rotating shaft 4 is moved. Shall slidably and mutual rotation in the axial direction is fixed to one rotary shaft 3 It does not matter.

In the present embodiment, the sealing member 9 provided with the sealing portion 16 and the dustproof portion 17 is exemplified. The sealing member 9 may be provided with only the sealing portion 16.

Further, the dust-proof member 11 may have any shape as long as dust attached to the outer peripheral surface of the first or second rotating shaft 3 or 4 can be removed. A shape that is provided with an angle may be used.

Further, in the present embodiment, the case where the dustproof connection structure of the rotating shaft of the present invention is used for a transmission of an automobile is exemplified. For example, the present invention may be applied to transfer of an automobile, or may be applied to a mobile body such as a ship or an aircraft, or to a non-mobile body such as a machine tool or an excavating machine.

Industrial applicability

The present invention can be used industrially as a dustproof connection structure of a rotating shaft that can reliably seal a housing and prevent the seal from being broken.

Claims

The scope of the claims

[1] A first rotating shaft housed in a housing, which is coaxially provided with the first rotating shaft and is connected to the first rotating shaft while being slidable in the axial direction and fixed to each other in mutual rotation. A dustproof connection structure for a rotating shaft provided with a second rotating shaft, wherein the first rotating shaft and Z or the second rotating shaft are supported inside a shaft hole of the housing. A sealing member is interposed between the inner peripheral surface of the shaft hole and the outer peripheral surface of the second rotary shaft, and an inner peripheral surface of the shaft hole in an outer portion of the shaft hole. A dustproof connection structure for a rotating shaft, wherein a dustproof member is interposed between the rotating shaft and an outer peripheral surface of the second rotating shaft.

[2] The dustproof connection structure for a rotating shaft according to claim 1, wherein a discharge portion is provided between an inner portion and an outer portion of the shaft hole of the housing.

[3] The distance between the inner portion and the outer portion of the shaft hole of the housing is set to at least an amount corresponding to an axial sliding amount of the second rotating shaft with respect to the first rotating shaft. 3. The dustproof connection structure for a rotating shaft according to claim 1 or 2.

4. The dustproof connection structure for a rotating shaft according to claim 3, wherein the sealing member is provided with a sealing portion and a dustproof portion.

[5] The dustproof connection structure for a rotary shaft according to any one of claims 1 to 4, wherein the dustproof member is projected substantially perpendicularly to the axial direction from an inner peripheral surface of the shaft hole.

6. The housing according to claim 1, wherein the housing is a housing of a transmission, the first rotating shaft is an output shaft of the transmission, and the second rotating shaft is a drive shaft or a transmission shaft. The dustproof connection structure for a rotating shaft according to any one of the above.