JPH0647134U - Oil tank - Google Patents

Abstract

(57) [Summary] [Purpose] The structure is such that a sealing force equivalent to the conventional one can be obtained even if the number of rubber packings is reduced. [Structure] A resin container 1 and a cylindrical resin strainer 2 having a filter portion 22 on the outer periphery and housed in the container 1.
In the oil tank consisting of, the strainer 2 has a ring-shaped resin seal portion 24 formed integrally around the outer peripheral surface, and the seal portion 24 is in contact with the inner peripheral surface of the container 1 for sealing. It is characterized by being

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil tank that is used in an oil circulation device of a power steering device of an automobile and has a strainer that filters oil.

[0002]

[Prior art]

 2. Description of the Related Art An automobile's power steering device uses an oil tank that contains a strainer for removing foreign matter during oil circulation. As shown in FIG. 4, this oil tank is composed of a resin container 100 and a cylindrical resin strainer 200 housed in the container 100.

The container 100 has an oil inlet 101 and an oil outlet 102, and a cap 103 is detachably engaged with the upper part of the container 100. Further, the strainer 200 includes a frame body 201 formed in a substantially tubular shape, a filter 202 held on the side peripheral surface of the frame body 201, and a pair of upper and lower sides held on the outer peripheral surfaces of the upper and lower portions of the frame body 201. It is composed of rubber packings 203 and 204. The packings 203 and 204 elastically contact the inner peripheral surface of the container 100 to seal the inside and outside of the filter 202.

In this oil tank, the oil flowing in from the oil inlet 101 is supplied only to the outer peripheral portion of the strainer 200 because it is sealed by the packings 203 and 204, is filtered by the filter 202, and is then fed to the inner peripheral surface of the strainer 200. Join the club. Then, the inside of the strainer 200 is filled up and down the strainer 200, and the strainer 200 is supplied to the oil pump from the lower oil outlet 102.

The foreign matter separated by the filter 202 and the oil before filtration do not mix with the filtered oil because the packings 203 and 204 seal, so that the oil pump always supplies the foreign matter-free oil to the oil pump. It is configured to be.

[0006]

[Problems to be solved by the device]

 However, in the above oil tank, since a pair of rubber packings are used, the number of parts is large, and the man-hours for assembling and the parts management are large, resulting in a cost problem. The present invention has been made in view of such circumstances, and an object thereof is to provide a structure in which a sealing force equivalent to that of the conventional one can be obtained even if the number of rubber packings is reduced.

[0007]

[Means for Solving the Problems]

 The oil tank of the present invention which solves the above problems comprises a resin container having an oil inlet and an oil outlet, and a cylindrical resin strainer housed in the container having a filter portion on the outer periphery. In the oil tank, the strainer has a ring-shaped resin seal part that is integrally formed around the outer peripheral surface, and the seal part is in contact with the inner peripheral surface of the container and is sealed. .

[0008]

[Action]

 In the oil tank of the present invention, the strainer has an integrally formed ring-shaped resin seal portion. The seal portion comes into contact with the inner peripheral surface of the container when the strainer is attached to the container, and the sealing property is obtained by contact between the resins. Since the seal part can be integrally formed when the strainer is molded, it is not necessary to assemble it later.

[0009]

【Example】

 Hereinafter, a specific description will be given with reference to examples. (Embodiment 1) FIG. 1 shows an oil tank according to an embodiment of the present invention. This oil tank includes a lower container 1 made of polyamide, a strainer 2 made of polyamide housed in the lower container 1, a container welded to the lower container 1 and the strainer 2 and having an opening together with the lower container 1. And the rubber cap 4 that is detachably engaged with the opening of the upper container 3.

An oil inflow pipe 10 and an oil outflow pipe 11 are formed in the lower container 1, and the oil inflow pipes 10 are arranged vertically so that the oil outflow pipe 11 is on the upper side and the oil outflow pipe 11 is on the lower side. A step portion 12 perpendicular to the side peripheral surface is formed on the inner peripheral portion slightly above the oil outflow pipe 11, and a cylindrical rib 13 is provided on the step portion 12 so as to project upward. .

The upper container 3 is formed in a coaxial triple cylinder structure of an outer cylinder 30, an intermediate cylinder 31 and an inner cylinder 32, and the outer cylinder 30 is welded to the open end surface of the lower container 1. The intermediate cylinder 31 is welded to the open end surface of the cylinder portion 21 of the strainer 2. The inner cylinder 32 has a bottomed cylindrical shape, and the opening thereof substantially constitutes the opening of the upper container 3. Further, a plurality of slits 33 penetrating the inner cylinder 32 are formed to communicate with the lower container 1 and prevent foreign substances from falling into the lower container 1.

On the outer side of the bottom of the upper container 3, an engaging cylinder portion 34 projects at an extended position of the intermediate cylinder 31, and the rubber cap 4 is detachably engaged with the engaging cylinder portion 34 so that the inner cylinder 32 of the inner cylinder 32 can be removed. It is blocking the opening. The strainer 2 includes a substantially cylindrical frame body 20, a cylindrical portion 21 protruding from the upper surface of the frame body 20, a net 22 as a filter portion, and a first peripheral portion provided on the upper end portion of the frame body 20. It is composed of a seal portion 23 and a second seal portion 24 provided on the peripheral portion of the lower end of the frame body 20, and the second seal portion 24 is located between the oil inflow pipe 10 and the oil outflow pipe 11. is doing.

The frame body 20 is formed in a substantially cylindrical shape having an opening at the top and bottom, and the side peripheral surface is frame-shaped so that the inside and outside of the frame body 20 communicate with each other. The net 22 is entirely held on the side peripheral surface, and the fluid flowing in and out of the side peripheral surface is configured to pass through the net 22 without fail. A tubular portion 21 projects from the upper surface of the frame body 20, and an end surface of the tubular portion 21 is welded to the intermediate tube 31 of the upper container 3. In addition, a plurality of through holes (not shown) are provided on the side peripheral surface of the tubular portion 21 so that the inside and outside of the tubular portion 21 communicate with each other. The upper portion of the frame body 20 is in a closed state except for the cylindrical portion 21, and the inside of the frame body 20 communicates with the upper container 3 only through the cylindrical portion 21.

The net 22 is made of 150-mesh polyamide, and the end portion that comes into contact with the frame body 20 is embedded and integrated in the frame body 20. The first seal portion 23 includes a ring groove 23a provided in a peripheral portion of an upper end portion of the frame body 20, and a rubber packing 23b held by the ring groove 23a and elastically contacting an inner peripheral surface of the lower container 1. It consists of The first seal portion 23 seals between the outer peripheral surface of the strainer 2 and the upper portion of the lower container 1 and the upper container 3.

Further, the second seal portion 24, which is a feature of this embodiment, has a cylindrical shape that protrudes downward from the peripheral edge portion of the lower end portion of the frame body 20, and is enlarged as shown in FIG. A seal projection 2 having a tubular portion 24a and a tapered surface 24b provided on the distal end of the tubular portion 24a and protruding outward in the radial direction and having a cone-shaped side surface whose diameter decreases toward the distal end. 4c. The tip of the maximum outer diameter portion of the seal protrusion 24c is in elastic contact with the inner peripheral surface of the lower container 1, and the tip surface of the seal protrusion 24c is in contact with the step 12. This seals between the outer peripheral surface of the strainer 2 and the lower portion of the lower container 1. Furthermore, the inner peripheral surface of the seal projection 24c contacts the rib 13, and the sealing force is obtained here as well, so that the sealing performance is further improved.

To manufacture the oil pump of this embodiment, first, the lower container 1, strainer 2, upper container 3 and cap 4 are formed separately. Next, the strainer 2 holds the net 22 and the packing 23b, and the net 22 and the packing 23b are inserted into the lower container 1 from the second seal 24 side. Here, the maximum outer diameter of the seal protrusion 24c is slightly larger than the inner diameter of the lower container 1. Therefore, as the seal protrusion 24c is inserted, the diameter of the second seal portion 24 is gradually reduced due to the presence of the tapered surface 24b, and the elastic reaction force is accumulated. When it is inserted until it abuts on the step 12, the seal projection 24c is pressed against the inner peripheral surface of the lower container 1 by the elastic reaction force with the inner peripheral surface abutting on the rib 13. However, since the maximum outer diameter portion of the seal protrusion 24c is linear and is pressed by a large pressure, high sealing performance can be obtained.

In this state, the packing 23b of the first seal portion 23 makes elastic contact with the inner peripheral surface of the lower container 1, so that the first seal portion 23 also has high sealing performance. Then, the upper container 3 is covered, the upper container 3 and the lower container 1 are welded together, and the upper container 3 and the strainer 2 are also welded together. As a result, the strainer 2 is integrally joined to the upper container 3 and the lower container 1 while maintaining the high sealability.

In the oil tank of this embodiment obtained in this way, the oil flowing from the inflow pipe 10 always passes through the net 22 due to the existence of the first seal portion 23 and the second seal portion 24. Enter the inner circumference of the strainer 2. As a result, the foreign matter is reliably removed, and the oil coming out of the outflow pipe 11 becomes clean. In the oil tank of this embodiment, packing is reduced compared to the conventional case, and the cost can be reduced by reducing the number of assembling steps.

In this embodiment, the seal projection 24c is in contact with the rib 13 for the purpose of further safety. However, when the quality is excessive, the desired sealability can be obtained without the rib 13. can get. (Embodiment 2) FIG. 3 shows a sectional view of the essential parts of an oil tank according to a second embodiment of the present invention. This oil tank is the same as that of the first embodiment except that the configuration of the first seal portion 23 is different.

In this oil tank, a seal protrusion 23 c similar to the second seal portion 24 is formed on the first seal portion 23 extending upward from the frame body 20 in a tubular shape, and the inner peripheral surface of the lower container 1 is elastic. It is in contact with the reaction force. Further, a cylindrical pressing rib 35 projects downward from the bottom of the upper container 3 and abuts and is welded to the end of the first seal portion 23.

That is, in the first seal portion 23, the seal due to the elastic reaction force of the seal protrusion 23c is directly fixed by welding, and the seal is ensured. Furthermore, a sealed space 36 is formed between the pressing rib 35 and the outer cylinder 30 to further ensure the seal. According to the oil tank of the present embodiment, the packing is not necessary, so that the cost can be further reduced.

[0022]

[Effect of device]

 That is, according to the oil tank of the present invention, the number of rubber packings can be reduced, and in some cases, sealing performance can be provided without using rubber packings. Therefore, the man-hours for assembling and managing the packing can be reduced, and the cost can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is an overall sectional view of an oil tank according to an embodiment of the present invention.

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

FIG. 3 is a sectional view of an essential part of an oil tank according to a second embodiment of the present invention.

FIG. 4 is an overall sectional view of a conventional oil tank.

[Explanation of symbols]

1: Lower container 2: Strainer 3: Upper container 4: Cap 12: Step portion 13: Rib 20: Frame body
22: Net 24: Second seal part 24b: Tapered surface 2
4c: Seal protrusion

Claims (1)

[Scope of utility model registration request] 1. An oil tank comprising: a resin container having an oil inflow port and an oil outflow port; and a cylindrical resin strainer housed in the container having a filter portion on an outer peripheral portion thereof. Is an oil tank having a ring-shaped resin seal part formed integrally around the outer peripheral surface, the seal part being in contact with and sealed to the inner peripheral surface of the container.