JPH0634020A - Seal ring - Google Patents

Abstract

PURPOSE:To apply a single seal ring to both an outer fitting sealing structure and an inner fitting sealing structure by forming an outer circumferential side sealing part and an inner circumferential side sealing part respectively on an outer fitting side member and an inner fitting side member that move relatively with each other, and forming fitting parts that fit to the edges of both moving members. CONSTITUTION:This seal ring R is arranged in an annular clearance between two rotating members 4A and 4B that move relatively with each other in the axial direction of a shaft 9. In this case, an outer sealing part 'ro' that faces to the inner circumferential surface 13 of the outer fitting side member 4A and an inner sealing part 'ri' that faces to the outer circumferential surface 14 of the inner fitting side member 4B are formed on a sealing body Rh. Fitting parts Rt for causing the sealing body Rh to fit to respective edges of both rotating members 4A and 4B are formed on the sealing body Rh while each fitting part Rt projects in the direction of the shaft center. Circumferential fitting grooves 'm' are formed inside of the respective fitting parts Rt. This process makes it possible for a single seal ring to be applied to both an outer fitting sealing structure and an inner fitting sealing structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal ring for preventing oil and dust from entering.

[0002]

2. Description of the Related Art As a seal ring for an annular gap formed between two rotary member-shaped members which are slid relative to each other in the axial direction, for example, a shaft member for sealing between a shaft member and a tubular member is used. An external fitting seal structure that is externally fitted and locked to the external member and an internal fitting seal structure that is internally fitted and locked to the tubular member to seal between the shaft member and the tubular member are known as general ones. .

[0003]

Therefore, when the seal rings having both the structures described above are used in an apparatus, an external fitting seal structure and an internal fitting seal structure are required. However, in this case, each seal ring is created as a dedicated component, which is disadvantageous in terms of mold cost, component cost, and its management. Therefore, if the seal diameters do not differ much, a seal ring with two specifications is set. It seems uneconomical to do and there seems to be room for improvement.
An object of the present invention is to reduce the cost by allowing a single seal ring to be used for both the outer fitting seal structure and the inner fitting seal structure.

[0004]

In order to achieve the above object, the present invention provides a seal ring for an annular gap formed between two members in the shape of a rotating body which are slid relative to each other in the axial direction. A seal main body is formed of an outer peripheral seal portion for a sealing function with respect to the inner peripheral surface of the member and an inner peripheral seal portion for a seal function with respect to the outer peripheral surface of the inner fitting side member, and this seal main body is provided with a sliding member It is characterized in that a fitting portion for mounting on the end is formed in a state of protruding in the axial direction.

[0005]

According to the above characteristic structure, since the seal ring is configured in a state in which both the outer fitting seal structure and the inner fitting seal structure can be applied, for example, as shown in FIG. Fixed pulley piece 4A and movable pulley piece 4
A seal ring R attached to the end of the movable pulley piece 4B in order to seal the gap with B is attached to the end of the movable pulley piece 5B in order to seal the gap between the movable pulley piece 5B in the passive pulley 5 and the rotary cylinder shaft 11. It becomes possible to use it by wearing it. That is, as shown in FIG. 4, the outer peripheral seal portion r
With the idea that either one of o and the inner peripheral seal portion ri is the actual use surface and the other side is idle, a single seal ring R can exert the sealing function at two different conditions. Became.

[0006]

As a result, the cost of the mold can be reduced by making the parts common and the cost per part can be reduced, and the seal rings used at different locations can be covered by a single part, so that no assembly error occurs. There is an advantage.

[0007]

Embodiments of the present invention will be described below with reference to the drawings when applied to a belt continuously variable transmission of a rice transplanter. A belt continuously variable transmission A is shown in FIG. 1 across an engine output shaft 7 and a mission input shaft 8, 4 is a drive split pulley composed of a fixed pulley piece 4A and a movable pulley piece 4B, and 5 is a fixed pulley piece 5A. And a movable pulley piece 5B, 6 is a belt, 7 is a clutch, and 16 is a linkage shift mechanism for slidingly adjusting both movable pulley pieces 4B and 5B as a set. More specifically, the drive split pulley 4 is configured such that the fixed pulley piece 4A is externally fitted to the drive side base shaft 9 which is externally fitted to the engine output shaft 7 by key connection, and the movable pulley piece 4B is fitted to the fixed pulley piece 4A. This is a structure in which the movable pulley piece 4B is slid by a drive-side cam mechanism 10 which is slidably fitted externally and is spline-fitted on the drive-side base shaft 9. In the passive split pulley 5, the fixed pulley piece 5A is spline-fitted to the passive-side base shaft 11 that is fitted to the mission input shaft 8 in an integrally rotating state, and the movable pulley piece 5B is slidably fitted to the passive side. This is a structure in which the movable pulley piece 5B is slid by a passive side cam mechanism 12 that is key-fitted and externally fitted to the base shaft 11. In the drive split pulley 4, between the fixed pulley piece 4A and the movable pulley piece 4B, in the passive split pulley 5, between the movable pulley piece 5B and the passive side base shaft 11, each movable pulley 4 is inserted.
A seal ring R is provided to prevent foreign matters such as dust from entering the gaps between B and 5B and the respective base shafts 9 and 11. Next, the seal structure will be described.

As shown in FIG. 4, the outer peripheral seal portion ro
And the inner peripheral seal portion ri for sealing the outer peripheral surface of the inner fitting side member forms the seal body Rh, and
A fitting portion Rt protruding in the axial direction from the seal body Rh
To form the seal ring R. Fitting part R
A fitting circumferential groove m is formed at t. Drive split pulley 4
Then, as shown in FIG. 2, the seal ring R is attached to the left end portion of the movable pulley piece 4B in a state in which the movable pulley piece 4B is prevented from coming off by fitting with the fitting circumferential groove m, and the inner peripheral surface 13 of the fixed pulley piece 4A is attached. The external fitting seal structure is adopted so that the sealing function is generated by the sliding contact between the outer peripheral seal portion ro and. In the passive split pulley 5, as shown in FIG.
The seal ring R is attached to the right end portion of the passive ring base shaft 11 in a state where the seal ring R is prevented from coming off by fitting with the fitting peripheral groove m.
The internal fitting seal structure is adopted so that the sealing function is generated by the sliding contact between the outer peripheral surface 11a and the inner peripheral seal portion ri. In the drive split pulley 4, the movable pulley piece 4
At the root portion of B, a contact surface 14 is formed for determining the state in which the winding diameter of the belt 6 is maximized by contact with the fixed pulley piece 4A.

[Other Embodiments] In order to mount the movable pulley pieces 4B and 5B by press fitting, the seal ring R may have a fitting portion Rt having a simple protruding shape. In this case, it is convenient to embed the reinforcing metal member.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a structural diagram showing a belt continuously variable transmission of a rice transplanter.

FIG. 2 is a sectional view of a drive split pulley portion showing an external fitting seal structure.

FIG. 3 is a sectional view of a passive split pulley portion showing an internal fitting seal structure.

FIG. 4 is a sectional view showing the shape of a seal ring.

[Explanation of symbols]

 Rh Seal body ro Outer peripheral seal part ri Inner peripheral seal part Rt Fitting part

Claims (1)

[Claims] 1. A seal ring for an annular gap formed between two rotary member-shaped members which are slid relative to each other in the axial direction, the outer peripheral seal portion having a sealing function for the inner peripheral surface of an outer fitting side member. (Ro) and the inner peripheral seal portion (ri) for the sealing function with respect to the outer peripheral surface of the inner fitting side member form a seal main body (Rh), and the seal main body (Rh) is provided with the seal main body (Rh). A seal ring formed by fitting a fitting portion (Rt) to be mounted on a shaft in a state of protruding in the axial direction.