JPS5833557Y2 - boost meter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a Booth L meter that indicates the suction pipe negative pressure of an internal heat engine such as an automobile and displays the load condition of the incandescent engine.

Conventional boost gauges using Bourdon tubes have the disadvantage that the tip of the Bourdon tube has low resilience, which causes the boost gauge needle to oscillate due to high-frequency pressure changes.
Since links, sectors, etc. are used as the enlargement indicating mechanism, it is difficult to adjust the index of the pointer, especially fine adjustment.

The present invention has been devised to eliminate these drawbacks, and provides a boost meter that allows easy and accurate adjustment of the index of the pointer.

The present invention will be described in detail below based on embodiments shown in the drawings.

Reference numeral 1 denotes a frame, and a first adjustment plate 3 and a second adjustment plate 4 are fixed to the back surface of the frame 1 in an overlapping state.The connection between these adjustment plates and the frame 1 is as follows. It is like that.

That is, the frame 1 and the first adjustment plate 3 are frictionally supported on the support shaft A, and the first adjustment plate 3 and the second adjustment plate 4 are frictionally supported on the support shaft B. .

Further, matching through holes 1 of relatively large diameter are bored in both adjustment plates 3 and 4, and bolts 8 fixed to the frame 1 are loosely fitted into these through holes I. ing.

Furthermore, an arm 9 is provided protruding from the second adjustment plate 4, and one end of a bellows 5 connected to an intake pipe of an internal combustion engine can be inserted and fixed into a through hole 10 provided in this arm 9. .

A drive pin 6 is provided at the other end of the bellows 5, and this drive pin 6 is loosely fitted into an elongated hole 2a formed at the end of the pointer 2 which is pivotally supported on the frame 1. 6 and the pointer 2 are connected, so that the pointer 2 is operated by the operation of the bellows 5, and the load condition of the internal combustion engine is indicated by the pointer.

In addition, when the pointer 2 indicates the zero position, the support shaft B and the drive bin 6
The position of the support shaft B is set so that the angle formed by the straight line connecting the two and the elongated hole 2a is approximately right angle.

The gist of the present invention is to fix the bellows to the frame via a first adjustment plate and a second adjustment plate so that the finger index can be easily adjusted by finely adjusting the fixing position of the bellows 5. Next, the finger index adjustment work will be specifically described.

First, the nut 11 screwed onto the bolt 8 is loosened, and the first adjustment plate 3 is rotated in a predetermined direction about the support shaft A, thereby fixing it via the arm 9 of the second adjustment plate 4. The drive pin 6 at the lower end of the bellows moves downward on the road,
As a result, the pointer 2 that engages with the drive pin 6 can be scaled to the zero position, and then a suction pipe negative pressure corresponding to the maximum scale is applied to the bellows 5, and the second adjustment plate 4
The pointer 2 can be adjusted to the maximum scale by rotating it about the support shaft B with respect to the first adjusting plate 3.

Note that the rotation of the second adjustment plate 4 does not affect the zero position adjustment of the pointer 2.

This is because when the pointer 2 indicates the zero position, the angle formed by the straight line connecting the support shaft B and the drive pin 6 and the elongated hole 2a is approximately a right angle.

After the adjustment is completed, tighten the nut 11 on the bolt 8,
Fix both adjustment plates to the frame.

As described above, in the present invention, the finger index of the pointer can be adjusted very easily and accurately by adjusting the position of two adjustment plates, and both of these adjustment plates are attached to one lock nut.
1 can be fixed to the frame, which is structurally advantageous.

Furthermore, since the present invention uses a bellows instead of the conventional Bourdon tube, the volume inside the bellows changes greatly in response to a change in indication, and the resistance due to air flow is large, so a surge tank etc. is provided to prevent needle deflection due to high frequency pressure changes. Moreover, since the bellows tip has strong spring properties, it is effective in preventing needle runout caused by external vibrations, etc.

[Brief explanation of the drawing]

The drawings all show an embodiment of the boost meter according to the present invention, and FIG. 1 is a front view thereof, FIG. 2 is a back view thereof, and FIG. 3 is a perspective view showing the main structure of the present invention. 1...Frame, 2...Pointer, 2a.
...Long hole, 3...First adjustment plate, 4...
...Second adjustment plate, 5...Bellows, 6.
...Drive pin, 7...Through hole, 8...
...Bolt, 9...Arm, 10...
Through hole, 11...Natsuto.

Claims (1)

[Scope of utility model registration request] In the boost gauge that indicates the suction pipe negative pressure of the internal combustion engine,
A frame 1, an indicating member 2 rotatably supported by the frame, a first adjustment plate 3 rotatably fixed to the frame, and a first adjustment plate rotatably fixed to the first adjustment plate. 2 adjustment plate 4, a bellows 5 fixed to the second adjustment plate and connected to the suction pipe, and a slot 2a provided at the movable end of the bellows and provided in the indicator member. death,
A boost gauge characterized in that it has a drive pin 6 for driving the indicating member, and fixing means 8 and 11 for fixing the second adjustment plate to the frame after finger index adjustment.