JPH0626816Y2 - Liquid level detection rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a liquid level detection rod for detecting a liquid level in a tank for storing a liquid such as an oil tank of an automobile.

(Prior Art) An oil tank of an automobile is provided with a liquid level detection rod that is detachably attached to a cylinder portion provided at an upper portion of the tank in order to detect an oil level in the tank.

As such a liquid level detecting rod, as shown in FIGS. 7 and 8, there is a rod having a substantially flat cross section so that the rod body a can be easily inserted and removed, and is easily bent. Then, a bellows-shaped seal rubber e, in which a large diameter portion c and a small diameter portion d are alternately overlapped, is fitted onto the rubber fitting portion b of the rod main body a, and the inner wall surface of the cylindrical portion f is inserted into the tank. The large-diameter portion c is elastically contacted with.

(Problems to be solved by the invention) However, in the above-mentioned conventional example, as shown in FIG. 8, a portion A located on both sides of the rod main body a of the small diameter portion d of the seal rubber e.
However, since it is difficult to obtain a large amount of bending in the longitudinal direction in the small diameter portion d due to a thin wall between both side edges of the rod main body a, the large diameter portion c of the seal rubber has a small deformation amount in the tubular portion. As a result of strong pressure contact with the inner wall surface of f, there is a problem that a large force is required to insert and remove the liquid level detection rod.

In view of the above problems, the present invention can sufficiently and properly take the amount of bending of the seal rubber in the longitudinal direction, reduce the force required for insertion / removal, and form the seal rubber compactly. An object of the present invention is to provide a liquid level detection rod that can firmly bond the rubber and the rod body.

(Means for Solving the Problems) In order to achieve the above object, the present invention detects a liquid level by sealing a bellows-shaped seal rubber into a rubber fitting portion of a rod body having a substantially flat cross section. In the rod, the width change part where the width dimension of the rod main body changes between the large diameter part at the top of the seal rubber and the small diameter part below it, and between the large diameter part at the bottom and the small diameter part above it. Is provided, and the width dimension of the rod main body in the portion located between the upper and lower width changing portions is smaller than that in the other portions.

(Operation) With the above configuration, the width dimension of the rubber sleeve fitting portion of the rod main body is set so that the rubber sleeve fitting portion has an upper end portion (a portion above the upper width changing portion) and a lower end portion (a portion below the lower width changing portion). Since it is set small except for, the wall thickness of the small diameter part of the seal rubber located on both sides of the rod body can be increased without increasing the overall shape of the seal rubber. The amount of bending can be made larger than that of the conventional example. As a result, when the liquid level detection rod is inserted into or removed from the tubular portion of the tank, the amount of deformation of the seal rubber with respect to the inner wall surface of the tubular portion can be increased, so that the force required for the withdrawal and insertion can be reduced.

The width change part of the rod body is located between the uppermost large diameter part of the seal rubber and the smaller diameter part below it, and between the lowermost large diameter part and the small diameter part above it. The large diameter part at the top and the large diameter part at the bottom of the rubber are backed up by the wide part of the rod body, so it is easy to receive a large external force because it hits the cylinder part of the tank when the liquid level detection rod is inserted or removed. The deformation of the large-diameter portion in the uppermost stage and the lowermost stage is properly suppressed. Moreover, the existence of the upper and lower width changing portions can strengthen the connection between the seal rubber and the rod body.

(Embodiment) FIGS. 1 to 4 show a first embodiment in which the present invention is applied to a liquid level detecting rod for an oil tank of an automobile.

The liquid level detection rod 1 includes a rod main body 2 having a substantially flat cross section,
It comprises a seal rubber 3 fitted in a rubber fitting portion 2a close to the upper end of the rod body 2. The lower end portion of the rod main body 2 is a gauge portion 2b that forms the oil level in the oil tank 4, and the upper end portion is the liquid level detection rod 1 that is the cylinder portion 5 of the oil tank 4.
It is a gripping portion 2c used when inserting and removing.

The seal rubber 3 has a bellows shape with a circular cross section, and has a large-diameter portion 3a that is slightly larger than the inner diameter of the tubular portion 5, and a diameter that is smaller than the inner diameter and slightly larger than the width dimension of the rod body 2. And the small diameter portions 3b are alternately laminated. On the other hand, the rod body 2
The width dimension of the rubber fitting portion 2a of
It is set to be smaller than the width dimension L of the upper and lower parts (broken line in FIG. 2) adjacent to 2a. Then, as shown in FIG. 1, the width changing portions P and Q that change from the width dimension L to the width dimension are provided between the uppermost large diameter portion 3a of the seal rubber 3 and the smaller diameter portion 3b below the uppermost diameter portion 3a. It is set between the large diameter portion 3a in the lower stage and the small diameter portion 3b above it.

As a result, the wall thickness of the small-diameter portion 3b of the seal rubber 3 located on both sides of the rod body 2 can be made larger than that of the conventional example (see FIG. 8). It is possible to increase the amount of flexure. As a result, when the liquid level detection rod 1 is inserted into or removed from the tubular portion 5 of the oil tank 4, the amount of deformation of the large diameter portion 3a elastically contacting the inner wall surface of the tubular portion 5 can be increased. Can be reduced. Further, there is an advantage that the step formed between the rubber sleeve portion 2a and the upper and lower portions adjacent to the rubber sleeve portion 2a prevents the seal rubber 3 from coming off.

5 and 6 show a second embodiment of the present invention.

In the present embodiment, the rubber sleeve 2a of the rod body 2 having a substantially flat cross section is formed into a circular cross section, thereby
As shown in the drawing, the width dimension thereof is made smaller than the width dimension L of the adjacent portion, and the wall thickness of both side portions A of the small diameter portion 3b is made large. According to this embodiment, the width dimension can be realized without reducing the cross-sectional area of the rubber sleeve fitting portion 2a as in the first embodiment, so that the rigidity of the rod body 2 can be secured. There is an advantage that the wall thickness of the small diameter portion 3b can be made uniform around the rod body 2.

(Effect of the Invention) Since the liquid level detection rod of the present invention has the above-described configuration and operation, it is possible to increase the amount of bending of the seal rubber in the longitudinal direction. In addition, it is possible to reduce the force required for insertion and removal in the tubular portion, it is possible to properly bend the upper and lower end portions of the seal rubber, and the seal rubber can be formed compactly. The effect is that the binding of can be strengthened.

[Brief description of drawings]

1 is a longitudinal side view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. FIG. 5 is a side view showing the structure, FIG. 5 is a perspective view showing the essential parts of a second conventional example of the present invention, and FIG. 6 is a VI of FIG.
-VI sectional view, FIG. 7 is a side view showing a main part of a conventional example, FIG.
The drawing is a sectional view taken along the line VIII-VIII in FIG. 1 …… Liquid level detection rod 2 …… Bar body 2a …… Rubber sleeve 3 …… Seal rubber

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A liquid level detecting rod comprising: a rubber main body having a substantially flat cross section; Between the lower small diameter portion and between the lowermost large diameter portion and the upper small diameter portion, a width changing portion for changing the width dimension of the rod body is provided, and the width changing portion is located between these upper and lower width changing portions. A liquid level detecting rod, wherein a width dimension of a rod main body in the portion is formed smaller than that in other portions.