JP2002047907A - Tappet adjusting jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily handle a jig for adjusting tappet clearance by even a beginner with low skillfulness and to smoothly and exactly perform an adjusting work. SOLUTION: A ratchet type torque control mechanism T is constituted by arranging a plurality of steel balls 12 at an intermediate flange part 4f of an outer wrench main body 4 having a fitting part 4k fittable into an adjust nut N, engaging the steel balls 12 to a plurality of radiating grooves 10m of a ring member 10 of a rotation operating body 5 and pressing the balls 12 by a spring 6. An inner wrench 3 is inserted into an insertion hole h of the outer wrench main body 4 and an adjust bolt B can be adjusted by a driver 3a at a tip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a jig for adjusting a tappet clearance of a vehicle engine, for example.

[0002]

2. Description of the Related Art Conventionally, for example, a work for adjusting a tappet clearance of a vehicle engine is performed by adjusting a clearance by screwing an adjustment bolt with a thickness gauge inserted into a gap of the tappet, and adjusting the clearance when a desired clearance is obtained. After tightening the nut and fixing it, pulling out the thickness gauge, it is common to use a torque wrench to tighten the adjustment nut to the specified torque. Therefore, there is known a technique of performing a series of operations with a single tool as disclosed in Japanese Patent Application Laid-Open No. 50-119400, for example.

[0003]

However, the adjusting tool of the above-mentioned technique has a problem that the mechanism is complicated and handling requires skill, and it cannot be easily handled by a beginner or the like, and the construction of the apparatus is costly. .

Accordingly, an object of the present invention is to provide an adjusting jig which can be easily handled even by a beginner with low skill, can perform adjustment work smoothly and accurately, and has a simple configuration.

[0005]

According to the present invention, there is provided a tappet adjusting jig provided with an outer wrench for rotating an adjusting nut and an inner wrench for rotating an adjusting bolt. In addition to providing a torque control mechanism of the type, an insertion hole through which an inner wrench can be inserted is provided.

If the outer wrench is provided with the ratchet type torque control mechanism, the adjuster bolt is screwed in with the inner wrench to adjust the tappet clearance, and then the adjust nut is tightened and fixed with the outer wrench and set to a specified torque. And the work is simplified. Further, if the inner wrench is inserted through the insertion hole, the whole can be compacted and a series of operations can be performed efficiently. Here, the ratchet-type torque management mechanism refers to a mechanism that can be tightened and fixed with a specified torque by an engagement mechanism using ratchet teeth, for example.

According to a second aspect of the present invention, the torque management mechanism is provided with a spring for adjusting the tightening torque.

If the tightening torque is adjusted by changing the biasing force of the spring, the device is simplified and the adjustment of the tightening torque is facilitated. Here, in order to be able to adjust the tightening torque by changing the biasing force of the spring, for example, in a ratchet mechanism composed of a steel ball and a cam groove, the engagement force between the steel ball and the cam groove is changed by the spring pressure. And the like.

[0009]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is an explanatory view showing a use state of the tappet adjusting jig according to the present invention, FIG. 2 is an explanatory view of an outer wrench, FIGS. 3 and 4 are explanatory views of a torque management mechanism of the outer wrench, and FIG. FIG. 3B is an explanatory view of a radiation groove of a ring member, and FIG.
3C is a sectional view taken along line AA in FIG. 3B, and FIG. 4 is an explanatory view of an intermediate flange portion of the outer wrench main body.

[0010] The tappet adjusting jig according to the present invention is used, for example, when adjusting the tappet clearance of a vehicle engine.
The adjustment work can be performed accurately even by a person with low skill, and the adjustment of the tightening torque can be easily performed while having a simple structure.

That is, the tappet adjusting jig 1 is shown in FIG.
As shown in the figure, an outer wrench 2 for tightening the adjustment nut N and an inner wrench 3 for adjusting the adjustment bolt B are provided. A thickness gauge g is inserted between the adjustment bolt B and the stem S to adjust the tappet. The jig 1 can be used to adjust the tappet gap.

As shown in FIG. 2, the outer wrench 2 includes an outer wrench main body 4 having an insertion hole h at the center thereof.
A rotary operation body 5 disposed above the intermediate flange portion 4f of the outer wrench main body 4, a spring 6 disposed above the rotary operation body 5, and a second spring for adjusting the urging force of the spring 6 The first and second lock nuts 7 and 8 are provided, and a lower end of the outer wrench 2 is provided with a fitting portion 4k for fitting to the adjustment nut N.

As shown in FIG. 3A, the rotary operation body 5 is rotatably fitted to the shaft of the outer wrench main body 4 and is fixed to the ring member 10 by welding or the like. The ring member 10 includes a pair of handle members 11, and a plurality of radiation grooves 10m as shown in FIGS.
Are provided at predetermined intervals.

The bottom surface of the radiation groove 10m is a cam surface. As shown in FIG. 3 (c), the upstream side in the tightening rotation direction is a stepped portion that drops sharply, and the downstream side is an inclined surface portion.

As shown in FIG. 4, a plurality of ball receiving grooves n are formed on the upper surface of the intermediate flange portion 4f of the outer wrench main body 4 (the side facing the rotary operation body 5). A ball 12 (FIG. 2) is provided. Then, the radiation groove 10m of the ring member 10 and the steel ball 12 are engaged with each other.
m and the steel ball 12 can be adjusted by the spring 6.

[0016] Radiation groove 10m, steel ball 1
2. The torque management mechanism T is constituted by the spring 6 and the like.
The outer wrench main body 4 is rotated along with the engagement of the radial groove 10m with the outer wrench.

After assembling the outer wrench body 4 as shown in FIG. 2, the adjusting nut N is fitted into the fitting portion 4k, and the handle 11 of the operation rotating body 5 is rotated clockwise. When this is done, the radial groove 10m and the steel ball 12 engage, the outer wrench body 4 rotates, and the adjust nut N is tightened. Then, the adjusting nut N is tightened, and the rotational torque increases to a certain value or more,
When this torque exceeds the engagement force between the radiation groove 10m and the steel ball 12, the steel ball 12 starts to slide on the inclined surface of the radiation groove 10m, and the operation rotator 5
Only idles and the rotation of the outer wrench body 4 stops.

The rotation torque is adjusted by adjusting the engagement force between the radiation groove 10m and the steel ball 12, that is, by adjusting the spring 6
By changing the biasing force of
For example, when the first and second lock nuts 7 and 8 are tightened,
When the urging force of the spring 6 increases, the rotational torque can be increased. Conversely, when the first and second lock nuts 7, 8 are loosened, the urging force of the spring 6 is weakened, and the rotational torque can be reduced. is there.

The inner wrench 3 is inserted into the insertion hole h of the outer wrench main body 4 so that the driver portion 3a at the tip can be engaged with a groove or the like of the adjusting bolt B and rotated. A general commercially available product having an operation section 3s and a ratchet mechanism 3r on the end side is used, and finally tightening by the ratchet mechanism 3r eliminates variations in the tightening of the adjustment bolt B and keeps the tappet clearance constant. To be able to

The above tappet adjusting jig 1 is shown in FIG.
After setting the thickness gauge g, the adjusting bolt B is tightened by the operation section 3s of the inner wrench 3 and finally tightened while checking the ratchet sound by the ratchet mechanism 3r. Then, when the desired clearance is confirmed by sliding the thickness gauge g, the adjusting nut N is
And set to the specified torque. Then, the thickness gauge g and the tappet adjusting jig 1 are removed.

In the adjustment work described above, the work that conventionally relied on the skilled worker's cans and tips can now be performed accurately even by a less skilled person such as a beginner. Since it is simple, it can be configured at low cost.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention.

[0023]

As described above, in the tappet adjusting jig according to the present invention, since the ratchet type torque management mechanism is provided on the outer wrench for rotating the adjust nut, when the adjust nut is tightened and fixed with the outer wrench. At the same time, the torque can be set to a specified value, the operation is simplified, and a series of operations can be performed efficiently if the operation is performed by inserting the inner wrench through the insertion hole of the inner wrench. If a spring for adjusting the tightening torque is provided, the device is simplified and the adjustment is easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a use state of a tappet adjusting jig according to the present invention.

FIG. 2 is an explanatory view of an outer wrench.

3A and 3B are explanatory views of a rotary operation body, wherein FIG.
Is an explanatory view of a radiation groove of the ring member, and (c) is an A- of FIG.
A section view

FIG. 4 is an explanatory view of a flange portion of the outer wrench main body.

[Explanation of symbols]

1: Tappet adjusting jig, 2: Outer wrench, 3: Inner wrench, 6: Spring, N: Adjust nut, B: Adjust bolt, T: Torque management mechanism.

Claims (2)

[Claims] 1. A tappet adjusting jig provided with an outer wrench for rotating an adjust nut and an inner wrench for rotating an adjust bolt, wherein the outer wrench has a ratchet type torque management mechanism and the inner wrench. A tappet adjusting jig, which has an insertion hole through which a hole is inserted. 2. The tappet adjusting jig according to claim 1, wherein said torque management mechanism includes a spring for adjusting a tightening torque.