JPH0528204Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a reservoir tank used in a vane pump or the like, and more particularly, to a reservoir tank with an improved filler structure at a fuel filler port.

(Prior Art) Recently, most pumps used as power sources for power steering devices are vane pumps. Vane pumps have the advantages of being small, lightweight, quiet, and simple to use, withstanding high-speed rotation, and having good volumetric efficiency during low-speed rotation.
It is widely used because it is highly reliable, and a reservoir tank is provided to supply hydraulic pressure to this vane pump.

A conventional reservoir tank of this type is, for example, one described in Japanese Utility Model Application Publication No. 19101/1983.
In this reservoir tank, the tank body is provided with a piped oil filler port, and the oil filler port is sealed with an oil cap that can be attached or removed with a single touch. A rod that slides inside the pipe is integrally formed in the oil cap, and an oil gauge is provided at the tip of the rod, and the oil level in the reservoir is checked by the oil gauge.

(Problem to be solved by the invention) However, in the case of such a conventional reservoir tank, as shown in Figs.
Two loosely fitting parts 3, two sliding parts 4, and two fixed parts 5 are provided on the outer peripheral edge of the oil filler port 2 formed by the oil cap. Since the oil cap is loosely fitted into the part 4 and the fixing part 5 and is slidably fixed, there are problems with the dimensional accuracy of the pipe and when installing and removing the oil cap.
The following problems arose.

() Variation in pipe dimensions (for example, 0.5
mm), there will be large variations in the tightening torque and release torque when attaching and detaching the oil cap to the pipe, making it difficult to attach and detach the oil cap. It also causes the oil cap to break and fall off.

() When the oil cap is repeatedly installed and removed, the oil cap claws become worn.

() Due to the above-mentioned () and (), a high degree of external diameter dimensional accuracy is required when manufacturing the pipe, making it difficult to manage the dimensional accuracy of the pipe.

(Purpose of the invention) Therefore, the present invention maintains the tightening torque and escape torque at a predetermined appropriate value when attaching and detaching the oil cap by providing a predetermined protrusion on the outer periphery of the sliding part of the pipe. This prevents the oil cap from being damaged or falling off, and also allows the pawls on the oil cap to wear out due to repeated attachment and detachment operations, making it possible to stabilize the tightening torque of the oil cap and manage the dimensional accuracy when manufacturing the pipe. The purpose is to improve.

(Means for solving the problem) In order to achieve the above-mentioned purpose, the reservoir tank according to the present invention has a refueling port with a pipe in the tank body,
A loose fitting part, a sliding part and a fixed part are formed on the outer periphery of the pipe where the oil filler opening opens, and the pawl of the oil cap is loosely fitted into the loose fitting part, and the oil cap is rotated to form the sliding part. In the reservoir tank in which the oil cap is fixed to the fixing part by sliding the pawl, a predetermined elastic projecting part is provided on the outer periphery of the sliding part.

(Function) In the present invention, an elastic projecting part is provided on the outer periphery of the oil filler port formed in the pipe, and the tightening torque and escape torque generated when the claw of the oil cap slides on the sliding part. is maintained at a predetermined appropriate value by the spring effect of the overhang.

Therefore, the oil cap is not damaged or falls off when the oil cap is attached/detached, and wear of the pawl due to repeated attachment/detachment operations is tolerated. As a result, the tightening torque of the oil cap becomes stable.
Improves control of dimensional accuracy when manufacturing pipes.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 4 are diagrams showing one embodiment of a reservoir tank according to the present invention. First, the configuration will be explained.

In FIG. 1, 10 is a reservoir tank. The reservoir tank 10 has a hole 11a that opens at one corner of a tank body 11 (part of which is shown in the figure), and a fuel filler port 13 is formed at one end of the opening of pipes 12a, 12b extending obliquely upward from the hole 11a. It is formed. The oil is stored in the tank body 11 by an oil gauge 16 provided at the tip of a rod 15 that is integrally molded with an oil cap 14 that seals the oil filler port 13 and inserted to a predetermined depth within the tank body 11. Now you can check the oil level. The pipe 12a has its open end protruding from the hole 11a expanded to a predetermined width;
The other open end of the pipe 12b is inserted and fixed into the enlarged diameter portion. A guide 15 is attached to the outer edge of the rod 15.
a, 15b, 15c and a recess 15d are provided.
Further, an O-ring 17 is fitted into the recess 15d, and is attached with a predetermined tightening margin between the pipe 12b and the recess 15d. oil cap 1
The structure of the pipe 12b to which 4 is fixed is as shown in Figs. 2 to 4, and in Figs.
12c is a loose fitting part, 12d is a sliding part, 12e is an overhanging part, and 12f is a fixed part. The loose fitting part 12c is connected to the pipe 1 in order to pass the pawl 14a of the oil cap 14.
The sliding part 12d is formed on the flange part of 2b.
is formed to extend in an axial cylindrical shape from the flange portion,
Furthermore, as shown in FIG. 4, the outer circumferential portion is inclined downward at a slight angle θ, and the overhanging portion 1 is expanded.
2e, and the tip 12g of this projecting portion 12e comes into contact with the claw 14a. Then, the claw 14a is fixed by the fixing portion 12f. Also, oil cap 14
Height H (illustrated) of the recess formed by the side end surface in contact with the flange of the pipe 12b and the end surface of the claw 14a on the pipe 12b side, and the end surface of the protrusion 12e bent downward from the flange on the claw 14a side. The heights are approximately the same.

Next, the effect will be explained.

The reservoir tank 10 is attached to a vane pump or the like, and supplies hydraulic oil to the vane pump. Visually check whether the oil level in the reservoir tank 10 is within gauge section A (shown) of the oil gauge 16,
When the oil level is within gauge section A, the amount is appropriate;
If the gauge range A has not been reached, there is a shortage and it is necessary to replenish the hydraulic oil. At the time of these checks, the oil cap 14 is attached and detached, and the oil cap 14 can be attached and detached by simply rotating the oil cap 14 to either the left or right (here, to the left) (approximately 90 degrees). When installing the oil cap 14, loosely fit the claw 14a of the oil cap 14 into the loose fitting part 12c, and rotate the oil cap 14 to either the left or right (rightward in this case).
4 slides on the sliding portion 12d, and the claw 14a slides on the projecting portion 12e. At this time, the tip 12g of the protrusion 12e comes into contact with the claw 14a and exhibits elasticity, and the oil cap 14 receives torque due to the elasticity. Then, when the oil cap 14 is further rotated, it is fixed to the fixing portion 12f. On the other hand, the oil cap 14 can be removed by rotating it approximately 90 degrees in the opposite direction from the fixed position.

In this case, in this embodiment, the oil cap 14
Since a resilient projecting portion 12e is provided on the outer circumference of the loose fitting portion 12c of the pipe 12b for attaching and detaching,
The tightening torque and release torque when the pawl 14a of the resin oil cap 14 slides are maintained at appropriate predetermined values. That is, the sliding portion 12d and the overhanging portion 12e are manually fitted into the recess formed by the oil cap 14 and the claw 14a, but at this time, by providing the overhanging portion 12e, the dimensions of the pipe 12b are Even if there is a variation of about 0.5 mm, the claw 14a will slide flexibly due to the elasticity of the overhanging portion 12e, and the values of the tightening torque and release torque will become very small or become very large. avoid doing.

Therefore, unlike the conventional method, the following improvements are made.

() Variations in the tightening torque and removal torque when attaching and detaching the oil cap 14 to and from the pipe 12b due to variations in the dimensions of the pipe 12b are reduced, and the oil cap 14 is prevented from being damaged or falling off.

() Claw 14a of oil cap 14 when resin oil cap 14 is repeatedly attached and detached
It is possible to prevent the wear of the parts and also allow the wear.

() The controllability of dimensional accuracy when manufacturing the pipe 12b is improved.

() Claw 14a of resin oil cap 14
Regardless of the rigidity of the oil cap itself, the tightening torque and release torque of the oil cap 14 are stable even in the surrounding environment such as cold resistance.

(Effects) According to the present invention, since a predetermined projecting portion is provided on the outer periphery of the sliding portion of the oil filler port formed by the pipe, the claw provided on the oil cap can slide on the sliding portion. Due to the elasticity of the overhang, the tightening torque and pull-out torque that occur when the oil cap is removed can be maintained at a predetermined appropriate value, eliminating the possibility of the oil cap being damaged or falling off when the oil cap is attached or removed. Wear of the claws can be tolerated. As a result, the tightening torque of the oil cap becomes stable, and the controllability of dimensional accuracy when manufacturing the pipe can be improved.

[Brief explanation of the drawing]

Figures 1 to 4 are views showing one embodiment of the reservoir tank according to the present invention, with Figure 1 being a sectional view of its pipe, Figure 2 being a plan view of its fuel filler port, and Figure 3 being its sectional view. 2 is a side view, FIG. 4 is a sectional view taken along the - arrow in FIG. 3, FIG. 5 is a plan view of a conventional reservoir tank fuel filler port, and FIG. 6 is a side view of FIG. 5. 10... Reservoir tank, 11... Tank body, 12a, 12b... Pipe, 12c... Loose fitting part, 12d... Sliding part, 12e... Overhanging part, 12
f... Fixed part, 13... Oil filler port, 14... Oil cap, 14a... Claw.

Claims (1)

[Scope of utility model registration request] A tank body is provided with an oil supply port formed by a pipe, a loose fitting part, a sliding part and a fixed part are formed on the outer periphery of the pipe through which the oil supply port opens, and a claw of an oil cap is loosely fitted into the loose fitting part, and In a reservoir tank in which the oil cap is fixed to the fixed part by rotating the oil cap and sliding the pawl on the sliding part, a predetermined elastic projecting part is provided on the outer periphery of the sliding part. A reservoir tank characterized by: