JPH0747681Y2 - Balancer mounting surface length distribution measuring tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a measuring tool for measuring the distribution of the balancer mounting surface length when mounting a balancer on a crankshaft of an engine.

[Conventional technology]

Conventionally, when a balancer is mounted on the crankshaft of an engine to prevent vibration, a coordinate measuring machine is used to measure the distribution of the length of the balancer mounting surface of the crankshaft.

As shown in FIG. 3, the center of the crank journal J attached to the bearing of the cylinder block of the crankshaft
And C _J, deviate and the center C _P of the crank pin P for mounting the connecting rod, the balancer attachment surface B is provided on the crank arm A for connecting the crank journals J and the crank pin P. The angle θ of the balancer mounting surface is C _P
The angle between the straight line connecting C _J and C _J and the perpendicular line from C _J to the balancer mounting surface B.

In the past, there was no suitable means to set the intersection point O with the perpendicular from C _J to the balancer mounting surface B, and to measure the left / right distribution dimension L / 2 of the balancer mounting surface B centered on this perpendicular. , I had no choice but to rely on a coordinate measuring machine.

[Problems to be solved by the device]

With conventional coordinate measuring machines, large coordinate measuring machines are installed in the centralized inspection room of the factory, so the workpieces must be taken out of the production line for measurement, and waiting for measurement occurs. The current situation is that it takes time to obtain the measurement results and the work efficiency is very poor.

An object of the present invention is to solve the above-mentioned problems of the related art, and to provide a measuring tool that does not need to carry out the measurement outside the production line to perform the measurement and can easily perform the in-line distribution measurement of the balancer mounting surface length. It is what

[Means and Actions for Solving the Problems]

The present invention forms a guide surface in the direction of the bisector of the V-shaped surface on a measuring block formed with a V-shaped surface to be brought into contact with the outer periphery of the crank journal of the crankshaft, and forms the guide surface with a balancer mounting surface. A balancer mounting surface length distribution measuring tool in which a measuring slider having a contact portion is slidably installed, and a distance detector to one side surface of the balancer mounting surface is arranged on the measuring slider.

The V-shaped surface of the measuring block of this measuring tool is brought into contact with the outer circumference of the crank journal, and the measuring slider is slid on the guide surface of the measuring block to bring the measuring slider into close contact with the balancer mounting surface. The perpendicular to the mounting surface and the measuring slider will be set at right angles, and the distance detector installed on the measuring slider will measure the length to one side of the balancer mounting surface.
By comparing with the reference master, the distribution of the balancer mounting surface length can be measured.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a perspective view showing a measurement state.

The measuring block 1 is provided with a V-shaped surface 2 which is placed on the outer periphery of the crank journal J of the crankshaft and is brought into contact therewith, and a guide surface 3 is provided along the bisector of the V-shaped surface 2.
The measurement slider 4 has one side guided by the guide surface 3 of the measurement block 1, and is integrally formed with a piece 4b hanging at a right angle to one end of an L-shaped piece 4a that abuts the balancer mounting surface B. A dial gauge 5 is installed on the hanging piece 4b in parallel with the L-shaped piece 4a.

Next, the distribution measurement of the balancer mounting surface length using this measuring tool will be described.

As shown in FIG. 2, first, the V-shaped surface 2 of the measuring block 1 of this measuring tool is placed on the outer periphery of the crank journal J of the crankshaft, and then the measuring slider 4 is attached to the guide surface 3 of the measuring block 1. To slide the L-shaped piece 4a into close contact with the balancer mounting surface B of the crank arm. In this state, as shown in FIG. 2, the perpendicular line ▼ drawn from the center C _J of the crank journal J to the balancer mounting surface B and the L-shaped piece 4a are set at a right angle, and the dial gauge 5 balances the balancer. L / 2 can be obtained by measuring the length of the mounting surface B up to one side surface D.

This measurement is preferably a comparative measurement described below.

Shows the state of the reference setting using the master M forming the contact piece length l on one side M _D of the balancer mounting surface M _B in Figure 4. The measuring slider 4 of the measuring tool is applied to the master M, and the L-shaped piece 4a is brought into close contact with the balancer mounting surface M _{B. At} that time, the position of the pointer of the dial gauge 9 at which one side M _D of the master M is measured is set as the reference dimension. To do. When measuring the work, read the scale on the dial gauge 9 and compare it with the standard size to obtain L /
Ask for 2.

[Effect of device]

The present invention does not need to take the work out of the production line to measure the balancer mounting surface length distribution, and can easily measure the balancer mounting surface length distribution of the crankshaft inline. There is an effect that can be greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a perspective view showing a measuring state, FIG. 3 is an explanatory view of the balancer mounting surface length distribution of a crankshaft, and FIG. 4 is a comparative measurement. 6 is a front view of dial gauge setting by the reference master of FIG. 1: Measuring block, 2: V-shaped surface 3: Guide surface, 4: Measuring slider 4a: L-shaped piece, 4b: Hanging piece 5: Dial gauge A: Crank arm, B: Balancer mounting surface D: Measuring surface, J: Crank journal P: Crank pin, M: Reference master

Claims (1)

[Scope of utility model registration request] 1. A measuring block having a V-shaped surface which is brought into contact with the outer circumference of a crank journal of a crankshaft,
A guide surface in the direction of the bisector of the mold surface is formed, and a measurement slider having a contact portion with the balancer mounting surface is slidably installed on the guide surface, and up to one side of the balancer mounting surface is attached to the measurement slider. A balancer mounting surface length allocating / measuring tool, which is provided with the distance detector.