JP2599911Y2 - Seal structure of the connection between the vehicle oil tank and the oil pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for sealing a connection between an oil reservoir tank for power steering and an oil pump, for example.

[0002]

2. Description of the Related Art FIG. 3 shows an oil reservoir tank (oil tank) 1 for power steering which is an object of the present invention.
FIG. On the lower surface of the oil reservoir tank 1, a cylindrical discharge portion (tube portion) 4 is formed. On the other hand, the upper surface of the oil pump 2
Are formed. By fitting the discharge portion 4 into the concave portion 5, the oil reservoir tank 1 and the oil pump 2 are connected, and a flow path from the former to the latter is formed. Therefore, the oil pump 2
When the pulley 3 is rotated, oil is supplied from the oil reservoir tank 1 through the oil pump 2 to a hydraulic system (not shown).

FIG. 4 is a sectional view showing a conventional connection structure between the oil reservoir tank 1 and the oil pump 2.
A small-diameter portion 6 having a reduced diameter is formed at a lower end of the discharge portion 4, and an O-ring 7 is mounted on an outer periphery thereof. The O-ring 7 may fall off as it is. Therefore, the guide ring 8 and the O-ring 7 are inserted by inserting a cylindrical guide ring 8 having a flange portion 8A at the lower end from the lower end of the discharge portion 4 and caulking the upper end in the discharge portion 4 to expand the diameter.
Is fixed.

[0004]

However, in the above-mentioned conventional sealing structure, since the work of caulking the guide ring 8 is performed from the inside of the oil reservoir tank 1, a caulking tool cuts the inner surface of the tank 1 at that time. The foreign matter which has fallen into the oil pump 2 may cause clogging of the oil supply passage.

In addition, since the guide ring 8 is used, the number of parts increases and the assembling process becomes complicated. For this reason, there has been a problem that the manufacturing cost increases. Further, since the O-ring 7 has low rigidity,
When the centering property between the O-ring 7 and the recess 5 is poor, the O-ring 7 is biased against the eccentric force, and a small contact pressure is generated at a part of the contact portion between the O-ring 7 and the recess 5, and oil may leak therefrom. was there.

The present invention has been made in view of the above circumstances, and does not require a member for fixing a seal ring such as a guide ring. It is an object of the present invention to provide a seal structure capable of reducing the number of the seal rings and preventing the bias of the seal ring.

[0007]

According to the present invention, in order to achieve the above-mentioned object, the present invention relates to a cylindrical tube formed to project from an oil tank and an oil pump. A seal structure for sealing between the inner cylindrical portion and the inner cylindrical portion, wherein a small-diameter portion for mounting a ring with a reduced diameter is formed at a distal end portion of the cylindrical portion, and an outer periphery of the small-diameter portion has an annular shape. The seal ring is mounted in a state of being elastically pressed against the seal ring, and the seal ring is configured by embedding an annular reinforcing member coaxially in an annular elastic body, and the reinforcing member includes an elastic body. A first seal portion that has a side wall portion surrounding the outer periphery of the small-diameter portion with the first seal portion protruding radially outward on the outer peripheral surface of the elastic body and pressing against the inner peripheral surface of the concave portion is provided on the entire periphery. The elastic body protrudes in the axial direction at the tip of the elastic body, Wherein the second sealing portion is pressed against the abutment surface of the is formed over the entire circumference.

In this case, it is desirable that the reinforcing member has a bottom wall portion axially opposed to the distal end surface of the small diameter portion with an elastic body interposed therebetween for the reason described later.

[0009]

In the seal structure according to the present invention, a seal ring in which an annular reinforcing material is embedded in an elastic body is used. Therefore, the tightening force of the seal ring on the small diameter portion is equal to the outer peripheral surface of the cylindrical portion and the reinforcing material. The pressing force of the seal ring against the inner peripheral surface of the concave portion corresponds to the thickness of the elastic member between the inner peripheral surface of the concave portion and the side wall portion of the reinforcing member. Corresponds to the thickness in the free state. Therefore, it is possible to separately set the tightening force of the seal ring on the small diameter portion and the pressing force of the seal ring on the inner peripheral surface of the concave portion.

As described above, since the tightening force of the seal ring on the small diameter portion and the pressing force of the seal ring on the inner surface of the concave portion can be set separately, the cylinder is made larger by making the former larger than the latter. The seal ring can be prevented from falling off from the small diameter portion when the portion is pulled out from the concave portion. Therefore, a guide ring for preventing falling off, which is conventionally required, is not required. Therefore, the number of parts can be reduced, and the caulking or the like of the guide ring is not required, and the generation of foreign matter accompanying the processing can be prevented.

Further, since the rigidity of the seal ring is improved by the reinforcing material embedded in the elastic body, even when the centering property between the cylindrical portion and the concave portion is poor, the bias of the seal ring is reduced against the eccentric force. Therefore, it is possible to prevent the sealing performance from being lowered.

Further, in the sealing structure according to the second aspect, since the reinforcing member is provided with the bottom wall portion facing the distal end surface of the small diameter portion with the elastic member interposed therebetween, the elastic member is not deformed in the axial direction. The displacement of the reinforcing member can be followed, and the elastic body can be prevented from being damaged by the side wall of the reinforcing member.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a connection structure between the oil reservoir tank 1 and the oil pump 2 as an embodiment of the seal structure according to the present invention.

[0014] Discharge portion (tube portion) of oil reservoir tank 1
At the lower end of 4, a small-diameter cylindrical mounting ring 6 having a reduced diameter is formed, and an annular seal ring 10 is coaxially mounted on the outer periphery of the small-diameter section 6. On the other hand, the oil pump 2 is formed with a concave portion 5 having an inner cylindrical shape, and the lower end portion of the discharge portion 4 is inserted into the concave portion 5, so that the oil reservoir tank 1 and the oil pump 2 are connected. The seal ring 10 seals between the recess 5 and the small diameter portion 6 of the discharge portion 4.

The main feature of the present invention is that the seal ring 10
This point will be described in detail with reference to FIG.
The seal ring 10 has an annular elastic member 12 coaxially embedded inside an annular elastic body 12.
Each of them has the same cross-sectional shape over the entire circumference. The elastic body 12 is formed of a known elastic material such as rubber, and the reinforcing member 14 is formed of a hard material such as metal.

The elastic body 12 has an upper end surface 24 pressed against the step surface 6A of the small diameter portion 6, an inner peripheral surface 22 pressed against the outer peripheral surface 6B of the small diameter portion 6, and a step surface 20 pressed against the distal end surface 6C of the small diameter portion 6.
And a small-diameter portion 6T
Between them is secured. A first seal portion 16 is formed on the outer periphery of the elastic body 12 to protrude radially outward and presses against the inner peripheral surface 5A of the concave portion 5 over the entire periphery. A second seal portion 18 protruding and abutting against the abutting surface 5B of the concave portion 5 is formed over the entire circumference. The cross section of each of the first seal portion 16 and the second seal portion 18 is preferably semicircular in view of the sealing effect. Further, the outer peripheral surface from the second seal portion 18 to the first seal portion 16 is formed as a gentle taper surface, so that the seal ring 10 can be easily inserted into the concave portion 5.

On the other hand, the reinforcing member 14 comprises a cylindrical side wall 26 extending in the axial direction, and a bottom wall 28 which is bent at a right angle from the lower end of the side wall 26 and extends inward in the radial direction.
The longitudinal section is L-shaped. The side wall portion 26 is substantially parallel to the outer peripheral surface 6B of the small diameter portion 6 with the elastic body 12 therebetween, and the bottom wall portion 28 is opposed to the distal end surface 6C of the discharge portion 4 and the elastic body 1.
They face almost in parallel with each other. All edges of the reinforcement 14 are chamfered so as not to damage the elastic body 12.

In the elastic body 12 in the free state, the thickness T1 of the portion between the side wall portion 26 and the inner peripheral surface 22 defines the pressure input to the discharge portion 4, and when the thickness T1 is increased, the small diameter portion is reduced. The fixing force of the seal ring 10 with respect to 6 can be increased. The thickness T2 of the portion between the side wall portion 26 and the first seal portion 16 defines the pressing force of the first seal portion 16 against the inner peripheral surface of the concave portion 5, and the fixing force to the small diameter portion 6 and the thickness T2. Can be set independently. Further, the bottom wall 28
The thickness T3 of the portion between the first and second seal portions 18 is
The sealing force by the second seal portion 18 is defined.

According to the seal structure having the above structure, since the seal ring 10 in which the annular reinforcing member 14 is embedded inside the elastic body 12 is used, the tightening force of the seal ring 10 on the small diameter portion 6 is small. Part 6 and side wall part 2 of reinforcing material 14
6, the pressing force of the seal ring 10 against the inner peripheral surface of the concave portion 5 corresponds to the elasticity between the inner peripheral surface of the concave portion 5 and the side wall portion 26. This corresponds to the thickness T2 of the body 12 in the free state. Therefore, it is possible to separately set the tightening force of the seal ring 10 on the small diameter portion 6 and the pressure contact force of the seal ring 10 on the inner peripheral surface of the concave portion 5.

Therefore, by setting the tightening force of the seal ring 10 on the small-diameter portion 6 larger than the pressure contact force of the seal ring 10 on the inner peripheral surface of the concave portion 5, it is possible to prevent the seal ring 10 from falling off from the small-diameter portion 4. This eliminates the need for a guide ring for preventing falling off, which was conventionally required. Therefore, it is possible to reduce the number of parts and to prevent the generation of foreign matter due to the work of fixing the guide ring and the increase in the flow path resistance in the discharge portion due to the guide ring.

The first elastic member 12 has a first
Since the seal portion 16 has a double seal structure in which the second seal portion 18 is pressed against the inner peripheral surface 5A of the concave portion 5 and the second seal portion 18 is pressed against the abutting surface 5B of the concave portion 5, the sealing performance can be improved. Further, since the rigidity of the seal ring 10 is improved by the reinforcing member 14 embedded inside the elastic body 12, even when the centering property between the discharge portion 4 and the concave portion 5 is poor, the seal ring 10 is biased against the eccentric force. Can be suppressed, and a decrease in sealing performance can be prevented.

Further, the reinforcing member 14 includes an elastic body 12.
Since the bottom wall 28 is provided axially opposite to the distal end surface 6C of the small diameter portion 6 with the space therebetween, the displacement of the reinforcing member 14 can follow the deformation of the elastic body 12 in the axial direction. Therefore, when the two are relatively displaced, the elastic body 12
Can be prevented from being damaged from the inside by the side wall 26 of the reinforcing member 14.

The present invention is not limited to the above embodiment, and the structure can be appropriately changed as needed. For example, in the above-described embodiment, the present invention is applied to the connection between the oil reservoir tank 1 for power steering and the oil pump 2, but is applied to the connection between the other oil tank and the oil pump. Of course, it is good. Also. The cross-sectional shape of the reinforcing member may be a shape other than the L-shape, such as a cylindrical shape without the bottom wall.

[0024]

As described above, according to the seal structure of the present invention, by using a seal ring in which an annular reinforcing material is embedded inside an elastic body, the seal ring can be fastened to the small diameter portion of the cylindrical portion. Since the pressing force and the pressure of the seal ring against the inner peripheral surface of the concave portion can be set separately, the tightening force of the seal ring against the small diameter portion is larger than the pressure of the seal ring against the inner peripheral surface of the concave portion. By doing so, it is possible to prevent the seal ring from falling off from the small-diameter portion, and a guide ring for preventing the seal ring, which has been required in the past, becomes unnecessary. Therefore, it is possible to reduce the number of parts, and it is also possible to solve problems such as the generation of foreign matter due to the operation of fixing the guide ring.

Further, the first seal portion formed on the outer periphery of the elastic member is pressed against the inner peripheral surface of the concave portion, and the second seal portion formed on the tip of the elastic member is pressed against the contact surface of the concave portion. Because of the seal structure, the sealability can be improved. Furthermore, since the rigidity of the seal ring is improved by the reinforcing material embedded inside the elastic body, even when the centering property between the cylindrical portion and the concave portion is poor, the bias of the seal ring is suppressed against the eccentric force, and the sealing performance is improved. Can be prevented from decreasing.

Further, in the sealing structure according to the second aspect, since the reinforcing member is provided with the bottom wall portion axially opposed to the distal end surface of the small diameter portion with the elastic member interposed therebetween, the elastic member has an axial direction. The displacement of the reinforcing member can be made to follow the deformation of the elastic member, and the elastic body can be prevented from being damaged from inside by the reinforcing member.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a seal structure according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the embodiment.

FIG. 3 is a front view showing an oil reservoir tank and an oil pump as one of application examples of the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional example of a seal structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil reservoir tank (oil tank) 2 Oil pump 4 Discharge part (cylindrical part) 5 Concave part 5B End surface 6 Small diameter part 6C Tip surface 10 Seal ring 12 Elastic body 14 Reinforcement material 16 1st seal part 18 2nd seal part 26 Side wall Part 28 Bottom wall

Continuation of the front page (72) Inventor Yukitaka Shikata 3-1-16-118 Naka-Aoki, Kawaguchi City, Saitama Prefecture (56) References Japanese Utility Model Sho 61-23502 (JP, U) Japanese Utility Model Sho 59-100101 (JP, U) ) Actually open Hei 1-102071 (JP, U) Actually open Hei 2-3973 (JP, U) Actually open 57-134490 (JP, U) Actually open 49-37662 (JP, U) Actually open 47619 (JP, U) Jiko 2-35042 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B62D 5/07 F16L 17/00

Claims (2)

(57) [Scope of request for utility model registration] 1. A seal structure for sealing a space between a cylindrical tubular portion protruding from an oil tank and an inner cylindrical concave portion formed in an oil pump to which the tubular portion is inserted and connected. A small-diameter portion for mounting a ring having a reduced diameter is formed at a tip end portion of the cylindrical portion, and an annular seal ring is mounted on an outer periphery of the small-diameter portion in a state of being elastically pressed. The ring is formed by embedding an annular reinforcing member coaxially in an annular elastic body, and the reinforcing member has a side wall surrounding the outer periphery of the small diameter portion with the elastic body interposed therebetween. A first seal portion protruding radially outward from the outer peripheral surface of the elastic body and pressed against the inner peripheral surface of the concave portion is formed over the entire circumference, and a tip end of the elastic body extends in the axial direction. A second seal portion that protrudes and presses against the abutting surface of the concave portion extends over the entire circumference. Seal structure, characterized by being made. 2. The seal structure according to claim 1, wherein the reinforcing member has a bottom wall portion facing the distal end surface of the small diameter portion with the elastic layer interposed therebetween.