JPH07332908A - Device for measuring the thickness of the thick wall under the top wall of a tappet - Google Patents

Abstract

(57) [Summary] [Purpose] To measure the thickness of the thick part on the lower surface of the top wall of the tappet with high accuracy. [Structure] A cage holder 7 having an annular piece 10 projecting from its tip is provided with a gauge mounting hole 11 which is biased so that its axis line faces the end face of the thick portion 1a at a right angle. Dial gauge 8 in the gauge mounting hole 11
Is fixed so that the probe 8c projects into the annular piece 10, and the gauge holder 7 is inserted to the innermost end of the cylindrical portion 1b to bring the probe 8c into contact with the thick portion 1a at a right angle. , Display its thickness accurately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device capable of easily measuring the thickness of a thick portion formed on the lower surface of the top wall of a tappet used in a valve operating mechanism of an internal combustion engine.

[0002]

2. Description of the Related Art In the past, most tappets used for a direct-acting valve operating mechanism in an internal combustion engine were made of iron, but recently, in order to reduce the weight of the valve operating system, It tends to be made of aluminum alloy. Since the aluminum alloy tappet is inferior in strength and abrasion resistance to the iron one, as shown in FIG. 2, the top wall with which the shaft end of the engine valve (V) of the tappet (T) abuts. A thick portion (1a) is formed at the center of the lower surface of (1), and a hard metal chip (3) is fitted into the upward recessed hole (2) formed in the thick portion (1a). Be used.

A disc-shaped recess (4) formed in the upper surface of the top wall (1) is fitted with a valve gap adjusting shim (5) made of a hard metal, which is brought into contact with a rotating cam (not shown). Used.

If the thickness (h) of the thick portion (1a) does not have a predetermined size, the depth of the recessed hole (2) varies, and the chip (3) is fixed by caulking the thickness (6). At this time, the tip (3) may rattle in the concave hole (2) due to insufficient caulking force.

Therefore, before mounting the chip (3), whether or not the thickness (h) is within an allowable range is measured by a sampling inspection.

Conventionally, M-type calipers, depth gauges, height gauges and the like have been used for this measurement.

[0007]

In the measurement using the above-mentioned gauge or the like, since the thick portion (1a) is formed in the innermost portion of the cylindrical portion (1b), the gauge reference surface is used as the thick portion. It is difficult to contact the measurement surface of (1a) at a right angle, and a measurement error is likely to occur in any gauge.

Further, in order to improve the measurement accuracy, it is necessary to horizontally mount the tappet (T) and the gauge on a surface plate or the like, and there is a problem that the measurement place is limited.

The present invention has been made in order to solve the above-mentioned problems, and in a tappet which enables highly accurate measurement by always contacting a measuring surface with a gauge at a right angle regardless of the measuring place. An object of the present invention is to provide a device for measuring the thickness of the thick portion on the lower surface of the top wall.

[0010]

SUMMARY OF THE INVENTION According to the present invention, the above object is to provide a thick wall portion formed in the center of the lower surface of the upper wall with a cylindrical portion and a top wall closing the upper end surface of the cylindrical portion. In a tappet provided with a concave hole for tip fitting in which the shaft end abuts, a measuring device for measuring the thickness of the thick portion, having an outer diameter and a length that can be inserted into and removed from the cylindrical portion, And a cylindrical gauge holder having an annular piece having a diameter larger than that of the thick portion protrudingly provided on the tip end thereof, which is oriented in the vertical direction and whose axis is biased so as to be orthogonal to the end face of the thick portion. This is solved by penetrating the mounting hole inward of the annular piece, and fixing a dial gauge having a probe protruding into the annular piece so as to be adjustable in vertical position in the gauge mounting hole.

[0011]

[Function] When the gauge holder is inserted into the cylindrical part of the tappet up to the innermost end, the gauge head of the dial gauge protruding into the annular piece comes into contact with the end face of the thick portion at a right angle, and the thickness of the thick portion is increased. Is displayed accurately by the pointer of the dial gauge.

[0012]

Embodiments of the present invention will be described below with reference to FIG.

The same components as those of the tappet (T) shown in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, (S) shows the apparatus of the present invention, which comprises a cylindrical gauge holder (7) and a dial gauge.
It consists of (8).

The gauge holder (7) has a tappet whose outer diameter is
The inner diameter of the cylindrical portion (1b) of (T) is approximately equal to or slightly smaller than that of the cylindrical portion (1b) so that the cylindrical portion (1b) can be closely fitted and removed.

A part of the outer peripheral surface of the gauge holder (7) is cut into a flat surface along the axial direction of the gauge holder (7), and a flat surface having an appropriate width is cut.
(9) is formed, and when the gauge holder (7) is inserted into the cylindrical part (1b), the air in the cylindrical part (1b) is quickly released to the outside through the planing surface (9). The insertion of the gauge holder (7) is facilitated.

Instead of the planing surface (9), the gauge holder (7)
May be provided with a groove or a through hole in the axial direction.

On the lower end surface of the gauge holder (7), tappet
An inner diameter capable of surrounding the thick portion (1a) of (T) and an annular piece (10) having a height slightly higher than that of the thick portion (1a) are used as a gauge holder.
Concentrated with (7), it is installed downward.

On the inside of the annular piece (10), a gauge holder
At a position slightly offset to the side of the center of (7), the gauge mounting hole (11) faces the vertical direction and makes the axis line at a right angle to the end face of the recessed hole (2) of the thick part (1a). Is installed throughout.

A dial gauge is provided in the gauge mounting hole (11).
The stem (8a) of (8) and the spindle (8
b) and are inserted, and the probe (8c) at the tip of the spindle (8b)
Touches near the outer edge of the end face of the thick portion (1a).

A radial female screw hole (12) communicating with the gauge mounting hole (11) is bored in the upper side surface of the gauge holder (7), and the dial gauge (8) has a female screw hole (12). ) Is fixed by a bolt (13) screwed into.

Next, using the apparatus of the above-mentioned embodiment, the thick portion
The procedure for measuring the thickness of (1a) will be described.

First, prior to measurement, dial gauge (8)
Is fixed to the gauge holder (7) so that the tip of the probe (8c) is aligned with the lower end of the annular piece (10). At this time, the pointer (14) of the dial gauge (8) is set to 0 scale. Adjust to instruct.

Then, as shown in FIG. 1, the gauge holder (7) is placed in the cylindrical portion (1b) of the tappet (T) placed upside down.
Is inserted until the lower end of the annular piece (10) contacts the lower surface (upper surface in FIG. 1) of the top wall (1). Then, the probe (8
c) contacts the thick portion (1a), the spindle (8b) is pushed up, the pointer (14) rotates, and the thickness (h) of the thick portion (1a) is displayed.

As described above, when the apparatus of the above embodiment is used, the gauge holder (7) is simply replaced by the cylindrical portion (1) of the tappet.
By simply inserting it all the way to the inside of b), the stylus (8c) of the dial gauge (8) always comes into contact with the end face of the thick part (1a) at a right angle, so there is no measurement error and measurement is possible. Precision is greatly improved.

Further, since it is not necessary to place the tappet (T) on a smooth table such as a surface plate, the measuring place is not limited, and quick measurement can be performed at the tappet manufacturing site.

Further, the gauge holder (7) or tappet
By rotating (T) relatively, the total thickness of the thick portion (1a) can be easily measured, which is convenient for checking the flatness and the like.

[0028]

According to the present invention, the following effects can be obtained. (a) The thickness of the thick part can be measured with high accuracy simply by inserting the gauge holder into the cylindrical part of the tappet to the far end.

(B) Since the surface plate or the like for holding the tappet horizontally is unnecessary, the measuring place is not limited.

[Brief description of drawings]

FIG. 1 is a central longitudinal front view showing an embodiment of the present invention and a measurement procedure therefor, in which tappets are arranged upside down.

FIG. 2 is a central longitudinal front view showing details of a tappet measured using the device of the present invention.

[Explanation of symbols]

 (1) Top wall (1a) Thick wall portion (1b) Cylindrical portion (2) Recessed hole (3) Tip (4) Recess (5) Shim (6) Crimped meat (7) Gauge holder (8) Dial gauge (8a) Stem (8b) Spindle (8c) Stylus (9) Planed surface (10) Annular piece (11) Gauge mounting hole (12) Female screw hole (13) Bolt (14) Pointer (S) Measuring device (T ) Tappet

Claims (1)

[Claims] 1. A tip-fitting concave hole with which a shaft end of an engine valve abuts is provided in a thick wall portion having a cylindrical portion and a top wall closing the upper end surface thereof, and formed in the center of the lower surface of the upper wall. In a tappet, a measuring device for measuring the thickness of the thick portion, which has an outer diameter and a length that can be inserted into and removed from the cylindrical portion, and has an annular shape with a diameter larger than that of the thick portion at the tip. A cylindrical gauge holder with one piece protruding is provided with a gauge mounting hole that is oriented in the vertical direction and is biased so that the axis is orthogonal to the end face of the thick portion,
A dial gauge, which extends through the inside of the annular piece, and has a gauge mounting hole, in which a dial gauge having a probe protruding into the annular piece is fixed so that the vertical position can be adjusted. Thickness measuring device for thick parts.