JP2751639B2 - Differential gear mesh clearance measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a mesh gap of a differential gear of a differential gear.

[0002]

2. Description of the Related Art FIG. 3 shows an example of such a conventional type. As the differential device 1 as an object to be measured, there is a differential device 1 used for a differential of an automobile, for example. This differential device 1 includes a differential case 2
A small gear shaft 3 is provided therein, and a pair of differential small gears 4 are rotatably fitted to the small gear shaft 3.
A first differential gear 5 and a second differential gear 6 screwed to the differential small gear 4 are rotatably disposed in the differential case 2. The two differential gears 5, 6 rotate about the same central axis.

A gap a between the first differential gear 5 of the differential device 1 and the inner wall 2a of the differential case 2, or a gap b between the second differential gear 6 and the inner wall 2a of the differential case 2 Is measured as follows.

That is, since the two differential gears 5 and 6 move up and down by the gaps a and b,
If the gaps a and b are too large or too small,
Since the meshing state between the two differential gears 5 and 6 and the differential small gear 4 changes, smooth power transmission is not performed.
The gaps a and b are measured.

The measurement of the gaps a and b is performed as follows.

First, the gap measuring tool main body 7 is connected to the differential case 2.
The differential pin 8 is inserted into the shaft insertion through hole 2b and the gap measuring instrument body 7 so as to be vertically movable, and the lower end of the differential pin 8 is The upper end of the differential pin 8 is brought into contact with the lower end of the dial gauge 9 while the upper end of the first differential gear 5 is brought into contact with the lower end.

In this state, when the operator moves the first differential gear 5 up and down by hand, the tracing stylus 9 a of the dial gauge 9 moves up and down via the differential pin 8, thereby causing the dial gauge 9 to move. Vertical movement amount, that is, the first differential gear 5
And the gap a between the differential small gear 4 is measured.

Further, the second differential gear 6, the differential small gear 4,
In order to measure the gap b , the same operation as described above is repeated.

However, in such a conventional device, the measurement is performed as described above,
Two measurements are required to measure a and b . Further, the gap measuring tool main body 7 is set, and the differential gears 5, 6
Has to be moved up and down, so that it takes time to measure the gap. Furthermore, there is a problem that skill is required for performing measurement without a measurement error because all are manual operations.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a differential gear meshing gap measuring device which is easy to measure and has good measuring accuracy.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and a pair of differential small gears are rotatably mounted on a small gear shaft provided in a differential case. A pair of differential gears meshing with the differential pinion are rotatably housed in a differential case about an axis orthogonal to the pinion shaft to form a differential device. In a differential gear meshing gap measuring device for measuring a meshing gap in a case, a blocking unit for blocking rotation of the pair of differential gears, a clamp unit for clamping the differential case, and the pair of differential gears. Rotating means for preventing rotation of the dynamic gear and rotating the differential case about the axis of the differential gear via the clamp means; measuring the amount of rotation and meshing from the amount of rotation; Gear with measuring means for measuring the clearance It is characterized in that the gap measuring device.

[0012]

According to this means, the differential case is clamped by the clamp means, and the rotation of the pair of differential gears is prevented by the fixing means.

From this state, a differential cable is
To the power. Then, the differential power, which is meshed with the differential small gear, moves by an amount corresponding to the mesh gap in the differential case, and the differential case moves by a predetermined amount around the axis of the differential gear. It is turned.

The amount of rotation is measured by measuring means, and the meshing gap is measured from the value of the amount of rotation.

By measuring the amount of rotation in this way,
The mesh gap is measured indirectly.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

FIGS. 1 and 2 show one embodiment of the present invention.

The structure of the differential device 1 in which the meshing gap is measured in this embodiment is the same as that shown in the conventional example, and the description is omitted.

The configuration of the differential gear meshing gap measuring device of this embodiment will be described. A fixed shaft 12 is attached to a casing 11 via a bearing (not shown). The fixed shaft 12 and the casing 11 move up and down. And this casing 11
Can rotate by a fixed angle with respect to the fixed shaft 12. A spline 12 a is formed at the lower end of the fixed shaft 12. The spline 12 a is inserted into the shaft insertion through hole 2 b of the differential case 2 and fitted to the first differential gear 5. Has become.

A pair of reinforcing plates 13 along the vertical direction are fixed to the casing 11, and clampers 14, 14 are rotatably mounted on the pair of reinforcing plates 13 by shafts 15, respectively. A clamp cylinder 16 is interposed between the upper ends 14a, 14a of the two clampers 14, 14, and the clampers 16, 14 are rotated by the clamp cylinder 16, and the lower end 14b of the differential device 1 The case 2 is clamped. These clampers 14, 14, the clamp cylinder 16 and the like constitute a clamping means for clamping the differential case 2.

From the upper end 13a of the pair of reinforcing plates 13, a pair of vertical connecting plates 17, 17 and the horizontal connecting plate 1 are provided.
By the provision of 8, the pair of reinforcing plates 13, 13 are connected.

As shown mainly in FIG. 2, a pair of measuring cylinders 20 are fixed to the base 19, and the cylinder rods 20a of the pair of measuring cylinders 20 are brought into contact with the vertical connecting plate 17, and these measuring cylinders 20 are measured. The clamper 14 is rotated about the fixed shaft 12 integrally with the reinforcing plate 13 and the like by the cylinder 20. The measuring cylinder 20 and the like constitute a rotating means for rotating the differential case 2 about the axes of the first and second differential gears 5 and 6.

A first encoder 21 as a measuring means is disposed on the horizontal connecting plate 18, and the first encoder 21
Is measured. The rotation amount is measured by the first encoder 21 and the like, and the mesh gap is measured from the rotation amount.

On the other hand, below the clamper 14, a receiving jig 22 for receiving the differential 1 is provided.

Further, below the receiving jig 22, there is provided a rotary shaft 26 which is rotated by the drive motor 23 via the first and second drive gears 24, 25. Is provided with a spline 26a to be fitted to the second differential gear 6.

In the figure, reference numeral 27 denotes a second encoder for detecting the rotational speed of the drive motor 23, and reference numeral 28 denotes the rotating shaft 2.
6 is a holding member for fixing the same.

The fixed shaft 12 and the rotating shaft 26 and the like form a blocking means for blocking the rotation of the differential gears 5 and 6.

Next, the operation of the differential gear meshing gap measuring device having such a configuration will be described.

First, the differential 1 is placed on the receiving jig 22, and the first and second driving gears 24, 2 are driven by the driving motor 23.
5, the rotating shaft 26 is raised while rotating at a low speed. In this case, the rotation speed of the first drive gear 24 is detected by the second encoder 27 and set to a predetermined rotation speed. By rotating in this manner, the rotating shaft 26
Is spline-coupled to the second differential gear 6 of the differential device 1. By further raising the rotating shaft 26, the differential device 1 is placed on the step 26 b of the rotating shaft 26.
, The differential device 1 is lifted from the receiving jig 22 (see FIG. 1).

Thereafter, by lowering the casing 11 and the fixed shaft 12, the spline 12a at the lower end of the fixed shaft 12 is spline-coupled to the first differential gear 5. At the same time, the differential case 2 is clamped by rotating the pair of clampers 14 around the shafts 15 by the clamp cylinder 16.

In this state, the fixed shaft 12, the rotating shaft 2
6, the measuring cylinders 20, 20 are driven, and the vertical connecting plates 17, 17 are alternately pushed with a constant load, whereby the vertical connecting plates 17, 17, the reinforcing plates 13, 13 are pressed.
The differential case 2 is rotated in the forward and reverse directions with a constant load via the clampers 14 and 14.

When the differential case 2 is rotated with the fixed shaft 12 and the rotating shaft 26 fixed, the differential gears 5 and 6 are meshed with the splines 12a and 26a.
The differential case 2 is rotated outward by a predetermined amount in accordance with the escape margin.

Therefore, the amount of rotation is determined by the first encoder 21.
, The size of the gaps a and b is calculated by calculating this detection value by the calculation device.

[0034]

As described above, according to the present invention, there is no need to move both differential gears up and down as in the prior art, and only one measurement is required. Since the measurement is carried out, the measurement accuracy is also good, and this has a practically useful effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a differential gear meshing gap measuring apparatus according to the present invention.

FIG. 2 is a plan view of the differential gear meshing gap measuring device of the same embodiment.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Differential device 2 Differential case 3 Small gear shaft 4 Differential small gear 5 First differential gear 6 Second differential gear Fixing means 12 Fixed shaft 26 Rotating shaft Clamping means 14 Clamper 16 Clamp cylinder 20 Measuring cylinder (rotation) Means) 21 First encoder (measuring means)

Claims (1)

(57) [Claims] 1. A pair of differential small gears are rotatably mounted on a small gear shaft disposed in a differential case, and a pair of differential gears meshing with the differential small gear are placed in the differential case. In a differential gear meshing gap measuring device which is housed rotatably about an axis orthogonal to the pinion shaft to form a differential, and measures the meshing gap of the differential gear in the differential case. Blocking means for blocking rotation of the pair of differential gears, and clamping means for clamping the differential case,
A rotation means for preventing rotation of the pair of differential gears, and rotating the differential case about the axis of the differential gear via the clamp means, and measuring the rotation amount; Measuring means for measuring the meshing gap from the amount of rotation.