JPH0222674Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a meshing inspection device for determining the quality of meshing between a side gear and a differential pinion of a differential gear for a vehicle.

2. Description of the Related Art In a differential gear mechanism for a vehicle, when the differential gear operates when the automobile is turned, an abnormal noise may be generated. Although it has been known that there is a close relationship between the loudness of this sound and the meshing accuracy of each gear of the differential gear, there has been no suitable evaluation method.
Conventionally, as a simple evaluation method, the accuracy of the differential gear has been evaluated by measuring the bump when the pinion of the differential gear meshes with the side gear, and based on the magnitude of the bump.
This type of backlash measurement method was developed in Japanese Patent Application Laid-open No. 57-
It is publicly known from Publication No. 166508 and the like. However, with this method, it is necessary to determine the backlash for each tooth meshing, which increases the time required for the inspection and is inefficient.Also, the gear meshing changes dynamically, whereas it is static. Evaluating the mesh by measuring the backlash under normal conditions,
It is hard to say that it is appropriate.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a simple and appropriate inspection device that can determine the quality of meshing between a side gear and a pinion in a differential gear mechanism.

The structural feature of the present invention is that the differential gear case is rotatably received and supported with its rotation axis in a vertical state, and is inserted into the output shaft extraction hole of one of the pair of side gears. It has a support means erected on a surface plate that non-rotatably supports one of the side gears, a clamp part that clamps to the output shaft extraction hole of the other side gear of the pair of side gears on the lower end side, and a center support means on the upper end side. A rod-shaped displacement take-off member having a hole and connected to the other side gear so as to be movable in the axial direction together with the other side gear; It consists of a detection pin that is supported by a panel so as to be movable up and down and is biased downward via a spring, and a detection means for detecting the amount of axial movement of this displacement extraction member, while rotating the gear case. , the amount of axial movement of the displacement extraction member is detected to detect the meshing state between the other side gear and the pinion.

The inspection device of the present invention fixes one side gear, holds the other side gear rotatably, and makes measurements while applying rotational input to the gear case with virtually no backlash between the side gear and the pinion. When measurements are carried out in this manner, a deviation occurs in the rotatable side gear in the direction of its rotation axis depending on the meshing state between the side gear and the pinion. In this invention, the deviation of this side gear is detected as a physical quantity representing the meshing state, and the measurement can be performed in a dynamic state close to the state of use, and the inspection can be performed quickly with easy operation. There are advantages.

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

FIG. 1 shows an inspection device 10 which is an embodiment of the present invention.
is shown in cross section along with the differential gear being inspected.

The differential gear 12 to be inspected includes a differential gear case 14 serving as a rotatable input member, and a pair of side gears 1 disposed oppositely within the gear case 14 so as to be coaxially rotatable with the differential gear case 14.
A pair of differential pinions 22, 2 mesh simultaneously with side gears 16, 18 which are rotatably mounted opposite to each other on a pinion shaft 20 perpendicular to the rotational axis of the gear case 14.
4, and the pinion shaft 20 is non-rotatably fixed to the differential case 14 by a spring pin 25. Therefore,
When the case 14 is rotated, the pinions 22 and 24 mesh with the side gears 16 and 18 and revolve around the axis of the axle, while rotating around the pinion shaft 20 as necessary. The inspection device 10 has a side gear fixing member 26 that is spline-engaged with an output shaft extraction hole of one side gear 6 of the differential gear 12, and this fixing member 26 is connected to a pin 28.
It is non-rotatably fixed to a hub 32 which is bolted onto a support base 30. That is, the rotation of the side gear 16 is restricted. hub 32
has a cylindrical portion 32a that rotatably guides one bearing portion 14a of the gear case 14, and a mounting portion 32b that receives the shaft end of the bearing portion 14a. Inspection device 1
0 is equipped with a horizontal surface plate 42, and this surface plate 42
A guide bar 44 and a stopper 46 disposed perpendicularly thereto are bolted to the top. Support stand 30 on which the differential gear 12 is supported
has a concave groove 30a on the lower surface, and the support base 30 is advanced in the longitudinal direction of the guide bar 44 by engaging the groove 30a with the guide bar 44, and the end thereof is connected to the stopper 4.
It can be stopped at the place where it touches 6.

In the output shaft extraction hole of the other side gear 18,
Via the other bearing portion 14b of the gear case 14,
The inserted collet tube 34 is crimped and fixed. Inside the collet cylinder 34, there is an enlarged tapered part 36 at one end.
An expansion rod member 36 having a diameter of 1.a is disposed, and the collet tube 34 has an axial slit 34a at an end corresponding to the enlarged tapered portion 36a of the rod member 36.
A nut 38 is rotatably attached to the other end of the collet tube, and the rod member 36 has a nut 38 attached to its end.
A screw 36b is formed that engages with. These collet cylinder 34, expansion rod member 36, and nut 38 constitute a displacement extraction member 40. A groove 36c is formed in the side surface of the rod member 36, and a rotation stopper pin 34b on the collet cylinder 34 is inserted into this groove 36c.
is engaged. Therefore, when crimping and fixing the collet tube 34 to the side gear 18, the nut is first rotated so that the enlarged taper portion 36a of the rod member 36 is fixed.
is made to protrude from the collet cylinder 34. In this state, the end portion of the collet tube 34 having the slit 34a contracts in the diametrical direction. In this state, collect tube 3
4 through the other bearing part 14b of the gear case 14, insert the collet cylinder 34 into the output shaft extraction hole of the side gear 18, position it, and then rotate the nut 38 at the top to move the rod member 36 in the axial direction. Pull it to draw the enlarged tapered portion 36a into the collector tube 34. As a result, the lower end of the collet tube 34 having the slit 34a expands in the radial direction, and the collet tube 34 is fixed in the output shaft extraction hole of the side gear 18.

The inspection device 10 includes a frame 48 installed vertically on a surface plate 42, and a detection pin support member 60 that supports a detection pin 56 via a bush 58 is attached to the frame 48 so that its position can be adjusted in the vertical direction. It is being The detection pin 56 is a bush 58
It is designed to be able to slide up and down in a guide hole provided in the guide hole, and one end thereof has a tapered support portion 5.
6b, and the center hole 3 at the end of the rod-shaped member 36.
It is arranged so as to abut against 6d. Butsuyu 5
A spring 64 is installed between the detection pin 8 and the detection pin 56, and urges the detection pin 56 toward the rod member 36. The pin 56 also has a side guide groove 56a.
A guide pin 66 bolted to the support member 60 is engaged with the guide groove 56a.

As shown in FIG. 3, a lever 68 is attached horizontally to the upper part of the detection pin 56. Further, a dial gauge device 72 is bolted to the support member 60 so that the tip of a detection rod 70 is in close contact with the lever 68, and detects the vertical movement of the detection pin 56. In this state, one side gear 1
6 is seated in the spherical hole of the gear case 14, but the other side gear 18 is not seated in this spherical hole, and only this side gear 18 engages with the pinions 22 and 24 without backlash. It fits. During the measurement, when the differential gear case 14 is rotated, the pinions 22 and 24 rotate while meshing with the side gears 16 with backlash. Since the rotation of the side gear 16 is restricted, only the side gear 18 is rotated, and along with this, the displacement extraction member 40 is rotated. In this case, the meshing between the side gear 18 and the pinions 22 and 24 is in a state where there is no backlash, so the side gear 18 moves vertically depending on the meshing state, and the vertical movement is transmitted from the detection pin 56 via the rod member 36. The signal is transmitted to the lever 68 and detected by the dial gauge device 72. Therefore, for example, by setting a limit value for the amplitude of this vertical vibration, it is possible to determine whether the meshing precision between the side gear 18 of the differential gear 12 and the pinions 22, 24 is good or bad. That is, by using this device, the accuracy of the differential gear can be comprehensively evaluated in a dynamic state simply by rotating the differential case 14 manually or using an appropriate power means.

Note that it is possible to determine whether the differential gear 16 is properly engaged or not by attaching the differential gear 12 upside down.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the differential gear inspection device of the present invention, Fig. 2 is a partial cross-sectional view of the collet tube used in the device shown in Fig. 1, and Fig. 3 is a cross-sectional view taken along line A-A in Fig. 1. It is a diagram. Explanation of symbols, 10... Inspection device, 12... Differential gear, 16, 18... Side gear, 22, 24... Pinion, 30... Support stand,
56...Detection pin, 72...Dial gauge device.

Claims (1)

[Scope of utility model registration request] A pair of umbrella-shaped differential pinions are disposed inside a differential gear case constituting a rotatable input member so as to be rotatable around an axis perpendicular to the rotation axis of the gear case, and the gear case A pair of umbrella-shaped side gears rotatable coaxially with the vehicle are arranged to face each other and simultaneously mesh with the pair of pinions, and an output shaft is attached to each of the side gears. In an apparatus for inspecting the meshing state of a side gear and a pinion in an allencial gear, the gear case is rotatably received and supported with its rotation axis in a vertical state, and the output shaft extraction hole of one of the pair of side gears is provided. a support means installed on a surface plate to non-rotatably support one of the side gears, and a clamp portion on the lower end side for clamping to the output shaft extraction hole of the other side gear of the pair of side gears; a rod-shaped displacement extraction member having a center hole at its upper end and connected to the other side gear so as to be movable in the axial direction together with the other side gear;
a detection pin which has a tapered support part at its lower end that contacts the center hole of the displacement extraction member, is supported on a surface plate so as to be movable up and down, and is biased downward via a spring; and a detection means for detecting the amount of axial movement of the member, which detects the amount of axial movement of the displacement extraction member while rotating the gear case, and detects the meshing state of the other side gear and the pinion. This is a device for inspecting the meshing condition between a side gear and a pinion in a differential gear for a vehicle.