JPH0442752Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a valve type pneumatic pressure indicator that has the function of a pneumatic valve such as a tire valve and displays the pneumatic pressure on a vehicle tire.

(Prior Art) As shown in Fig. 2 of Japanese Patent Publication No. 47-46082, a type of valve-type pneumatic indicator passes through the rim of a vehicle and is airtightly attached to the rim. a cylindrical body whose portion faces into the tire; a cap which is removably attached to an outer end of the cylindrical body and covers an outer end opening of the cylindrical body;
an indicator rod that is fitted into the cylindrical body so as to be movable in the axial direction; and an indicator rod that is disposed within the cylindrical body and allows only the flow of pressurized air from the outer end opening side of the cylindrical body to the tire side. comprising a check valve mechanism, and a bellows disposed within the cylindrical body to support the indicator rod and to be deformed by air pressure in the tire to move the indicator rod in the axial direction;
There is a valve-type pneumatic indicator configured so that the amount of movement of the indicator rod can be visually confirmed from the outside.

In this type of air pressure indicator,
The indicator rod is formed into a cylindrical shape, and a check valve mechanism is built into the indicator rod, and the check valve mechanism closes the inner hole of the indicator rod. A bellows supporting the indicator rod is disposed between the rod and the cylindrical body.

As a result, in the tire pressure indicator, the air pressure inside the tire deforms the bellows, and the indicator rod moves in the axial direction according to the amount of deformation of the bellows, and the amount of movement of the indicator rod can be visually checked from the outside. It allows you to know the air pressure. In addition, to replenish the air pressure inside the tire, remove the cap from the cylinder, connect the air pressure supply source to the indicator rod, and use air pressure to open the check valve mechanism built into the indicator rod to replenish the air pressure. It is.

(Problem to be solved by the invention) By the way, in this pneumatic indicator, the check valve mechanism is built into the indicator rod, so the check valve mechanism has to be made small. There is a problem in that it takes a considerable amount of time to replenish the air pressure in the tire through the tire, and there is also a problem in that the indicator rod becomes heavy and the responsiveness of the movement of the indicator rod decreases.

Therefore, the purpose of the present invention is to address these problems.

(Means for Solving the Problems) The present invention provides a pneumatic indicator having the above-described structure, in which a circumferential gap is formed between the inner periphery of the cylindrical body and the outer periphery of the indicator rod, extending over substantially the entire length of the indicator rod. At the same time, an annular valve seat in which the check valve mechanism is provided inside the cylindrical body, and an annular valve body disposed on the inner end side of the cylindrical body from the valve seat and facing the valve seat; a spring member that urges the valve body to sit directly on the valve seat,
Further, the bellows is fixed to a valve body constituting the check valve mechanism, and the inner end of the indicator rod is supported by the bellows.

(Operations and effects of the invention) In the air pressure indicator having such a configuration,
Since the check valve mechanism is placed outside the indicator rod, the mechanism can be made larger, and since the pressure air inflow passage is placed around the outer periphery of the indicator rod, the inflow passage can be made larger. This significantly reduces the time required to replenish the tire air pressure. Further, since the indicator rod is separate from the check valve mechanism, the indicator rod does not become heavy and impair responsiveness during movement.

(Embodiment) An embodiment of the present invention will be described below based on the drawings. FIGS. 1 and 2 show an air pressure indicator A according to an embodiment of the present invention. As shown in Fig. 3, the air pressure indicator A penetrates through the rim b1 of the wheel B and is airtightly attached to the rim b1, and in the attached state, the inner end of the air pressure indicator A is attached to the tire b2. Come within.

Air pressure indicator A is indicator body 1
0. Air pressure display mechanism 2 disposed within the main body 10
0, first check valve mechanism 30 and second check valve mechanism 4
It consists of 0. The first check valve mechanism 30 corresponds to the check valve mechanism of the present invention.

The indicator body 10 mainly includes a stepped cylinder 11 and corresponds to the cylinder of the present invention.
An end cap 12 is fitted to the inner end of the cap. Further, a seal packing 13 and a washer 14 are fitted onto the outer periphery of the stepped cylindrical body 11 from the inner end side, and a cylindrical nut 15 is screwed so as to be movable forward and backward. A cap assembly 10a is removably screwed onto the outer end. The seal packing 13 functions as a fixing member to the rim b1 in cooperation with the washer 14, and also functions as a sealing member for airtight sealing.

The cap assembly 10a is screwed on after the air pressure display mechanism 20 and both check valve mechanisms 30, 40 are assembled into the stepped cylinder 11 and attached to the rim b1, and is made of transparent resin. 16, a cylindrical cover 17a fitted on the top side, a retainer 17b, a compression spring 17c, and a sealing gasket 17d. In such a cap assembly 10a, an annular protrusion 16a is provided on the inner periphery of the axially central portion of the cap 16, and the opening of the cover 17a comes into contact with this annular protrusion 16a, and the flange of the retainer 17b is engaged with the annular protrusion 16a. A compression spring 17c is interposed between these two 17a and 17b. cover 1
7a and the retainer 17b are made of colored resin, with the cover 17a being colored white and the retainer 17b being colored red.

The air pressure display mechanism 20 is an indicator rod 2
1, a bellows 22 and a compression spring 23. The indicator rod 21 is made of resin and consists of a rod main body 21a and a cylindrical indicator portion 21b fitted around the outer periphery of the rod main body 21a. The indicator section 21b is colored blue. Such an indicator rod 21 is connected to the stepped cylinder 1.
Double check valve mechanism 3 inserted into 1 and operated later
The cylindrical valve body 31 and the valve plate 41 that constitute 0, 40
The inner end of the indicator rod 21 is supported by bellows 22 which sandwich the outer periphery therebetween. Also,
The indicator rod 21 has an annular recess 11a in the stepped cylinder 11 and an annular stepped portion 21a in the rod body 21a.
The bellows 2 is
The second side is biased. In this state, a circumferential gap is formed between the outer periphery of the indicator rod 21 and the inner periphery of the stepped cylinder 11, extending over substantially the entire length of the indicator rod 21.

The first check valve mechanism 30 includes a cylindrical valve body 31, a sealing 32, a compression spring 33, and an annular valve seat 34.
It is composed of. A sealing member 32 is slidably fitted to the outer periphery of the inner end of the cylindrical valve body 31 and is elastically supported by a compression spring 33, and fitted to the intermediate portion of the outer periphery. is seated on an annular valve seat 34 formed at the end of the stepped cylinder 11.

The second check valve mechanism 40 includes a valve plate 41, a support plate 42, and a ball valve body 43.
The valve plate 41 and the support plate 42 are the ball valve body 4
3 is fitted into the inner hole of the cylindrical valve body 31 together with the bellows 22 and secured by caulking. The valve plate 41 and the support plate 42 have ventilation holes 41a and 42 communicating with the accommodation chamber of the ball valve body 43.
a, and the air pressure inside the tire b2 is controlled by a bellows 22.
Introduced between the valve plates 41.

In the air pressure indicator A, the rim b of the wheel B is shown with the cap assembly 10a removed.
1, and after applying the specified tire air pressure to the bellows 22 and moving the indicator rod 21 a predetermined amount toward the outer end, the cap assembly 10a is assembled.
is screwed onto the outer end of the stepped cylinder 11. In this state, the indicator rod 21 is biased toward the inner end by the compression spring 17c, and is positioned at the top dead center due to the action of the air pressure inside the tire. It is located at 16a.

In the air pressure indicator A configured in this way, when the air pressure inside the tire b2 reaches a specified pressure, the blue color of the indicator rod 21 is visible from the outside in the state shown in FIG. I can do it. Thereby, it can be confirmed that the air pressure in the tire b2 is at a specified value.

Furthermore, when the air pressure inside the tire b2 gradually decreases from the specified value, the bellows 22 accordingly reduces the amount of axial deformation and retreats the indicator rod 21 toward the inner end. Therefore, the portion of the indicator rod 21 (blue) located on the annular protrusion 16a of the cap 16 gradually decreases, and the retainer 1
The portion 7b (red) gradually increases and finally the indicator rod 21 reaches the bottom dead center as shown in FIG. Therefore, the value of the tire b2 internal air pressure can be confirmed based on the ratio of the blue and red parts that can be visually recognized from the outside.

Note that if the bellows 22 or the like is damaged, the ball valve body 4 constituting the second check valve mechanism 40 may be damaged.
3 closes the vent hole 41a of the valve plate 41 under the action of the air pressure inside the tire b2, thereby preventing a sudden drop in the air pressure inside the tire b2.

On the other hand, to replenish the tire air pressure, the cap assembly 10a of the air pressure indicator A is removed from the stepped cylinder 11, and a pressure air supply nozzle is attached to the stepped cylinder 11 to supply pressurized air. As a result, pressurized air flows through the circumferential gap between the inner periphery of the stepped cylindrical body 11 and the outer periphery of the indicator rod 21, and flows into the cylindrical valve body 3 constituting the first check valve mechanism 30.
1 is pushed against the compression spring 33 to separate the valve body 31 from the valve seat 34. As a result, pressurized air is supplied into the tire b2 through the opening 12a of the end cap 12.

By the way, in the pneumatic indicator A, a circumferential gap is formed between the stepped cylinder 11 and the indicator rod 21, and the gap is used by the first check valve mechanism 30 disposed outside the indicator rod 21. Since it is configured to close, the check valve mechanism 30 can be made as large as possible in this type of pneumatic indicator, and the gap that functions as an inflow passage for pressurized air is large.
The time required to replenish the tire air pressure can be significantly reduced. In addition, indicator rod 2
Since the indicator rod 1 is separate from the first and second check valve mechanisms 30 and 40, the indicator rod 21 does not become heavy and has good responsiveness when moving the indicator rod 21. be.

Further, in this embodiment, since the indicator rod 21 is biased toward the inner end by the compression spring 17c, a preset load can be applied to the indicator rod 21, and the inner end of the indicator rod 21 can be biased. The indicator rod 21 can be easily moved to the side, and from this point of view as well, the indicator rod 21 has good responsiveness when moving.

In addition, in the air pressure indicator A,
The retainer 17b and the indicator rod 21 of the cap assembly 10a are colored differently from each other,
The proportions of these two colored parts can be visually checked from the outside. Therefore, the amount of movement of the indicator rod 21 becomes clear, which helps improve the indicator function.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal side view of the indicator rod of the pneumatic pressure indicator according to an embodiment of the present invention when it is retracted, and Fig. 2 is a partially longitudinal side view of the indicator rod of the pneumatic pressure indicator when it is at its maximum movement. , FIG. 3 is a partial sectional view showing a part of the wheel equipped with the same air pressure indicator. Explanation of symbols, 10... Indicator body, 10
a... Cap assembly, 11... Stepped cylinder, 16
...Cap, 17...Compression spring, 20...
... Air pressure display mechanism, 21 ... Indicator rod, 22 ... Bellows, 30 ... First check valve mechanism, 31 ... Cylindrical valve body, 33 ... Compression spring, 34 ... Valve seat, 40 ... second check valve mechanism, 4
1... Valve plate, 42... Support plate, 43... Ball valve body, A... Air pressure indicator.

Claims (1)

[Scope of utility model registration request] A cylindrical body that penetrates the rim of the wheel and is airtightly attached to the rim so that the inner end faces into the tire, and an outer end opening that is removably attached to the outer end of the cylindrical body. a cap that covers the cylindrical body; an indicator rod that is fitted into the cylindrical body so as to be movable in the axial direction; a check valve mechanism that allows only the flow of the indicator rod; and a bellows that is disposed within the cylindrical body to support the indicator rod and is deformed by the air pressure in the tire to move the indicator rod in the axial direction; In a valve-type pneumatic indicator configured so that the amount of movement of the indicator rod can be visually confirmed from the outside, a valve-type pneumatic indicator is provided that extends over substantially the entire length of the indicator rod between the inner periphery of the cylinder and the outer periphery of the indicator rod. an annular valve seat forming a circumferential gap and having the check valve mechanism provided at the inner end of the cylinder; and an annular valve seat disposed closer to the inner end of the cylinder than the valve seat and facing the valve seat. The indicator is composed of an annular valve body and a spring member that biases the valve body to seat it on the valve seat, and the bellows is fixed to the valve body constituting the check valve mechanism. A bulb type pneumatic indicator characterized by supporting the inner end of a rod.