JPH10157760A - Cap structure of reservoir tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a cap structure of a reservoir tank, wherein a looseness and a removal of a cap are prevented from generating by preventing a permanent set-in fatigue of a plate spring of the cap from generating. SOLUTION: This cap for a reservoir tank is equipped with a packing which is joined to the upper side of the peripheral edge of a filling port of a tank, and a plate spring which is engaged with the lower side of the peripheral edge of the filling port, and pinches the peripheral edge of the filling port by an elastic force, together with the packing, on a cap body. In this case, the plate spring 13 has an arch part 13a which is formed by bending into an arch shape at the center, spring pieces 13b which respectively extend from both sides of the arch part, and an engaging part 13c which is provided at the tip of the spring piece respectively, and is engaged with the lower side of the peripheral edge of the filling port of the reservoir tank, and the cap body has a protruding part 11d which fastens the plate spring by engaging with the arch part 13a of the plate spring 13, and at the same time, a plate spring holding part 11b which comes into contact with the top part of the arch part 13a of the plate spring 13 to prevent the plate spring from ejecting, and works a detent of the plate spring as well is formed for the constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap structure for various reservoir tanks such as a power steering reservoir tank, a clutch reservoir tank, and a brake fluid reservoir tank mounted on a vehicle such as an automobile.

[0002]

2. Description of the Related Art Conventionally, a cap as shown in FIGS. 5 to 7 is used as a cap of a reservoir tank mounted on a vehicle such as an automobile. The cap shown in FIG. 5 is described in Japanese Utility Model Laid-Open No. 2-18772, in which a resin-made lower cap 2 is welded to a resin-made upper cap 1 by ultrasonic welding. A plate spring 3 having an engagement portion 3a at both ends and a hole 3b having an engagement piece 3c at a center portion is fitted to the gauge portion 2c provided at the bottom of the reservoir tank, as shown in FIG. 5 is engaged with the injection port 6 so that the injection port 6 can be sealed by the elasticity of the packing 4 and the leaf spring 3.

The cap shown in the exploded perspective view of FIG. 6 is composed of an upper cap body 1 made of resin, a lower cap body 2 made of resin, a leaf spring 3 and a packing 4. Has a dish-like shape with irregularities for slip prevention formed on the outer periphery, and the lower cap body 2 has a leaf spring holding portion 2b for fixing a leaf spring which also serves as a rotation stop of the leaf spring at the center of the disk portion 2a. The leaf spring 3 has a curved engaging portion 3a formed at both ends, and a hole 3b for screw insertion at the center.

Then, the upper cap body 1 and the lower cap body 2 are welded and connected by ultrasonic welding, and a leaf spring 3 is fixed to a leaf spring holding portion 2b of the lower cap body 2 by a screw 7. Then, as shown in FIG. 8A, it is engaged with the inlet 6 of the reservoir tank 5. At this time, the length of the leaf spring 3 is formed to be longer than the inner diameter of the injection port 6, but is inserted through a notch (not shown) formed by cutting the injection port 6. Then, the engaging portion 3 a of the leaf spring 3 is engaged with the lower edge of the inlet 6 by twisting the cap body. The leaf spring 3 is elastically deformed, and the repulsive force presses the packing 4 against the upper edge of the injection port 6 to seal the injection port 6.

The cap shown in the exploded perspective view of FIG.
The upper cap body 1 is composed of a resin upper cap body 1, a resin lower cap body 2, a leaf spring 3, and a packing 4, and the upper cap body 1 has a dish shape with irregularities for preventing slip on its outer periphery. The lower cap body 2 has a disk portion 2a, a leaf spring holding portion 2b and a gauge portion 2c formed integrally with each other,
In each of the first and second embodiments, a curved engaging portion 3a is formed at both ends, and holes 3b are formed in the center of the elongated hole, from which the engaging pieces 3c project obliquely from both ends.

A leaf spring holding portion 2b of the lower cap body 2
Has a gate shape and a projection 2 as shown in FIG.
d is formed, and when the leaf spring 3 is press-fitted,
The leaf spring 3 is held by engaging with the engaging portion 3b. Then, the upper cap body 1 and the lower cap body 2
Is welded to the lower cap body 2 by ultrasonic welding.
The leaf spring 3 is press-fitted and held in the leaf spring holding portion 2b. Then, as shown in FIG. 8 (b), it is engaged with the inlet 6 of the reservoir tank 5 in the same manner as the above-mentioned cap.

[0007]

As described above, in the conventional reservoir tank cap, a method of fixing a leaf spring to a resin cap body by a screw as shown in FIG. As described above, there is a method by press-fitting. In any of the methods, a hole is provided in the center of the leaf spring. Normally, when a load is applied to both ends of a leaf spring, a maximum bending stress is generated at the center of the leaf spring. However, when a hole is formed in the center as in the leaf spring of the conventional cap, the stress is generated near the hole. Concentration and further stress increase, which causes sagging. When the sag increases, the cap loosens and comes off, causing a problem of oil leakage.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention is directed to a reservoir tank in which a stress generated by a leaf spring for attaching a cap to an injection port is suppressed to a low level, thereby preventing set and preventing loosening and detachment of the cap. It is intended to realize a cap structure.

[0009]

In the reservoir tank cap structure according to the present invention, a packing 12 closely contacting the upper side of the inlet periphery of the tank and a packing 12 engaging the lower side of the inlet periphery to engage the packing. And a leaf spring 13 which elastically clamps the periphery of the inlet with the leaf spring 13 at least in the cap body.
Reference numeral 3 denotes an arch portion 13 formed in an arch shape in the center.
a, a spring piece 13b extending from both sides of the arch part 13a, and an engagement part 13c provided at the tip of each of the spring pieces 13b and engaged with the lower side of the inlet port peripheral edge of the reservoir tank, The cap body has a projection 11d that engages with the arch portion 13a of the leaf spring 13 and locks the leaf spring 13, and the arch portion 13 of the leaf spring 13
a leaf spring holding portion 11b which is in contact with the upper portion of the leaf spring 13 to prevent the leaf spring 13 from coming off and also serves to prevent the leaf spring 13 from rotating, and the leaf spring 13 is elastically deformed on the leaf spring holding portion 11b. It is characterized in that it can be mounted by using the.

[0010] In addition, a positioning portion is formed on the outer periphery of the leaf spring holding portion, the positioning portion being capable of being fitted to an inlet of a reservoir tank to position the cap.

By adopting this configuration, since no hole is provided in the leaf spring, when a load is applied to both ends of the leaf spring, no concentrated stress is generated by the hole, and therefore, generation of set is prevented. Thus, a cap structure of the reservoir tank capable of preventing oil leakage from the cap is obtained. In addition, when the cap is engaged with the injection port, the positioning portion formed on the leaf spring holding section separates the leaf spring from the projection, but can position the cap with respect to the injection port.

[0012]

1 and 2 are views showing an embodiment of the present invention. FIG. 1 is an exploded perspective view, and FIG. 2 is an assembled sectional view. 1 and 2, reference numeral 10 denotes an upper cap body made of resin, 11 denotes a lower cap body made of resin, 12 denotes packing, and 13 denotes a leaf spring. And the upper cap body 1
Numeral 0 is a dish-like shape having anti-slip irregularities formed on the outer periphery, and a plurality of welding projections (not shown in FIG. 1) are formed on an inner flat surface portion. Also, the lower cap body 11
The disk portion 11a, the leaf spring holding portion 11b, and the gauge portion 11c which are welded to the upper cap body 10 are integrally formed.

The upper cap body 1 is provided on the disk portion 11a.
A plurality of protrusions for welding to zero are formed, the leaf spring holding portion 11b has a gate shape, and two rib-shaped protrusions 11d for locking the leaf spring are formed at the bottom. A positioning portion 11e having an outer diameter slightly smaller than the inner diameter of the inlet is formed on the outer periphery of the leaf spring holding portion 11b for positioning the cap when engaging with the inlet of the reservoir tank. The packing 12 is formed from a plate made of an elastic material such as rubber or plastic and has a donut shape having substantially the same outer diameter as the disk portion 11a of the lower cap body 11. Also, leaf spring 1
As shown in FIG. 1, an arch portion 13a is formed by bending the central portion into an arch shape, and trapezoidal spring pieces 13b, 13b are formed continuously on the left and right sides.
Engaging portions 13c, 13c are formed at the tips of b, 13b, respectively, to engage with the inlet of the reservoir tank.

The length of the two rib-shaped projections 11d formed on the leaf spring holding portion 11b of the lower cap body 11 is such that the arch portion 13a of the leaf spring 13 can be fitted. The width of the inside of the leaf spring holding portion 11b is set so that the rotation of the leaf spring 13 can be stopped.
a is formed to be equal to the width in the longitudinal direction and the height inside is equal to the height of the arch portion 13a.

The members thus formed are assembled as shown in FIG. That is, the upper cap body 10 and the lower cap body 11 are welded and connected by combining the respective ridges by ultrasonic welding, and the leaf spring 13 is mounted on the leaf spring holding portion 11b of the lower cap body 11. The leaf spring 13 is mounted by press-fitting the leaf spring 13 from one end of the gate-shaped portion of the leaf spring holding portion 11b from one end thereof as shown in FIG. It is mounted over the projection 11d as shown in FIG.

FIG. 4 shows an embodiment of the present invention configured as described above.
It is used as shown in FIG. In the figure, 1
Reference numeral 4 denotes a reservoir tank, and reference numeral 15 denotes an inlet thereof. The inlet 15 is provided with a notch (not shown) through which a leaf spring 13 of a cap can pass, and a slope with which an engaging portion 13c of the leaf spring 13 engages. Have been. The cap of the present embodiment is
The leaf spring 13 is inserted through the notch, and the upper cap body 10 is twisted so that the engaging portion 1 of the leaf spring 13
3c engages with the slope of the lower edge of the inlet. As a result, the leaf spring 13 is elastically deformed, and the repulsive force presses the packing 12 against the upper edge of the injection port to seal the injection port.

In this case, the leaf spring 13 applies a load to the engaging portions at both ends, and a maximum stress is generated in the arch portion 13a.
Since no holes are formed in the arch portion, concentrated stress due to the holes as in the conventional example does not occur. Therefore, no sagging occurs. Therefore, loosening and detachment of the cap are prevented, and oil leakage is also prevented.

In this case, as shown in FIG.
3 is located at a position away from the projection 11d due to elastic deformation,
When viewed only from this cross section, misalignment of the cap with respect to the reservoir tank occurs. Leaf spring 13 and reservoir tank Y-
Although the displacement in the Y direction is prevented by the step of the engagement portion 13c,
The positional relationship between the leaf spring 13 and the cap body is shifted.

4 (b), which is a cross section orthogonal to FIG. 4 (a), and FIG. 4 (b), which is a cross-sectional view taken along the line cc of FIG. By bringing the outer diameter of the molded positioning portion 11e closer to the inner diameter of the injection port 15, misalignment of the cap in the XX direction can be prevented. Also, in the YY direction, if the clearance between the injection port 15 and the positioning portion 11e is small, misalignment can be effectively prevented. When the cap is removed from the reservoir tank, the leaf spring 13 instantaneously returns to the initial shape shown in FIG.
Thereby, the cap is fixed at the center.

[0020]

According to the reservoir tank cap structure of the present invention, since no hole is provided in the leaf spring attached to the cab, concentrated stress due to the hole does not occur, and therefore, there is no settling due to excessive stress. . For this reason, the cab is prevented from loosening and coming off, and oil leakage can also be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

2A and 2B are diagrams showing an embodiment of the present invention, wherein FIG. 2A is a longitudinal sectional view, FIG. 2B is a sectional view taken along line bb in FIG.
(C) is a view on arrow Z of (a).

FIG. 3 is a diagram showing a mounting method of a leaf spring according to the embodiment of the present invention.

FIG. 4 is a diagram showing a use state of the embodiment of the present invention;
(A) is a longitudinal sectional view, (b) is a sectional view taken along line bb in (a), and (c) is a sectional view taken along line cc in (b).

FIGS. 5A and 5B are views showing an example of a conventional reservoir tank cap, in which FIG. 5A is an exploded perspective view, and FIG. 5B is an assembled sectional view together with the reservoir tank.

FIG. 6 is an exploded perspective view showing another example of a conventional reservoir tank cap.

FIG. 7 is an exploded perspective view showing still another example of a conventional reservoir tank cap.

FIG. 8 is an assembled sectional view showing the cap of the conventional reservoir tank shown in FIGS. 6 and 7 together with the reservoir tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Upper cap body 11 ... Lower cap body 11a ... Disc part 11b ... Leaf spring holding part 11c ... Gauge part 11d ... Projection 11e ... Positioning part 12 ... Packing 13 ... Leaf spring 13a ... Arch part 13b ... Spring piece 13c ... Joint 14: reservoir tank 15: inlet

Claims (2)

[Claims] At least the cap body includes a packing which is in close contact with the upper side of the periphery of the inlet of the tank, and a leaf spring which is engaged with the lower side of the periphery of the inlet to elastically hold the periphery of the inlet together with the packing. In the reservoir tank cap, the leaf spring is provided at an arch portion bent in an arch shape at a central portion, a spring piece extending from both sides of the arch portion, and a tip of each of the spring pieces. And an engaging portion that engages with the lower side of the inlet port peripheral edge of the reservoir tank.The cap body has a projection that engages with the arch portion of the leaf spring to lock the leaf spring, A leaf spring holding portion that contacts the upper portion of the arch portion of the leaf spring to prevent the leaf spring from coming out and also serves as a detent for the leaf spring is formed, and the leaf spring is provided with the elastic deformation of the leaf spring. It can be attached using Cap structure of the reservoir tank according to claim. 2. A reservoir tank according to claim 1, wherein a positioning portion is provided on an outer periphery of said leaf spring holding portion, said positioning portion being capable of being fitted into an inlet of said reservoir tank to position said cap. Cap structure.