JPH01188222A - Lapping method for gear - Google Patents

Abstract

PURPOSE:To lap a gear through a simple mechanism by relatively oscillating a pair of gears centering around a predetermined oscillation center vertical to a flat face including the directions of an assembly distance and of an offset to change the assembly distance and the offset between the gears. CONSTITUTION:A pinion gear 10 is oscillated centering around a predetermined oscillation center P vertical to a flat face including the directions of a assembly distance H and of an offset V of the pinion gear 10, namely one parallel to a paper face where the figure is drawn. In lapping the pinion gear 10 and a ring gear 12, the gears 10, 12 are engagingly rotated by a rotary driving device, and the pinion gear 10 is oscillated around the oscillation center P. Consequently, variation of the then engaging state of the gear 10 with the ring gear 12, for example a direction of movement of its tooth bearing position, is similar to the variation of their engaging state in a case where the gears 10, 12 are loaded when they are actually used with them mutually engaged, and the gears 10, 12 can therefore be finely lapped.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for lapping gears, and more particularly to an improvement in a method for lapping a pair of gears in which the entire tooth surface is lapped by moving a pair of gears relative to each other.

BACKGROUND OF THE INVENTION Conventionally, gears have been given a ramp finish for the purpose of reducing gear noise. For example, a method for lapping a pair of conical gears that are used in mesh with each other, such as a hypoid gear, is as follows.
“Bevel gears and worm gears” (Taiga Publishing) No. 111
As described on pages 112 to 112, conventionally,
The V&H (perimmate) method and the SPC method are known.

Both of these methods move the tooth contact position in the width direction of the tooth surface to create a ramp finish on the entire tooth surface. The pair of gears is moved relative to each other in the direction of distance and the direction of offset, and S
In the PC system, the negative gear is oscillated in the axial direction.

Problems to be Solved by the Invention However, in the VAH method described above, it is necessary to relatively move a pair of gears in two directions in order to move the tooth contact position, and there is a problem that the configuration of the device becomes complicated. Ta. In addition, the mechanism of the SPC method is relatively simple because the entire tooth surface can be lapped using only a rocking motion, but since the movement of the pair of gears is in the axial angular direction,
When the gear is actually used, the load may deform the support member or the gear may bend, causing the meshing state to change, but the direction of movement of the tooth contact position is different, and the The lapping effect could not be obtained.

Means for Solving the Problems The present invention has been made against the background of the above circumstances.
The purpose of this is to use a simple mechanism to change the meshing state in substantially the same way as the meshing state changes due to the load during use, thereby making it possible to perform lapping.

In order to achieve such an object, the present invention provides a method for changing the assembly distance and offset of one gear when a pair of conical gears are meshed and rotated to finish lapping. A lapping method in which the entire tooth surface is lapped by moving the tooth contact position in the tooth width direction of the tooth surface by relatively moving a pair of gears, the method comprising lapping the entire tooth surface in the direction of the assembly distance and the offset. The assembly distance and offset of the pair of gears are changed by relatively swinging the pair of gears around a predetermined swing center perpendicular to a plane including the direction. .

Operation and Effects of the Invention According to such a lapping method, a pair of gears is relatively oscillated about a oscillation center perpendicular to a plane that includes the assembly distance direction and offset direction of one gear. Since the assembly distance and offset of one gear can be changed by simply changing the assembly distance and offset of one gear, the device It becomes easy to configure. In addition, the change in the meshing state in this case is very similar to the change in the meshing state under load when actually using gears, and the SP that swings in the shaft angle direction is
Compared to the C method as well as the V&H method, it is possible to perform a good lapping finish taking into consideration the magnitude of load and deformation during use.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, in FIGS. 1 and 2, the pinion gear 10
The ring gear 12 is attached to a lapping machine (not shown), and the pinion gear 10 is rotated along the axis by a rotational drive device such as a motor. While the ring gear 12 is driven to rotate in both forward and reverse directions, a load torque is applied to the ring gear 12 by a brake device such as a friction type or an electromagnetic type. The offset V, which is the distance between the axis l of the pinion gear 10 and the axis m of the ring gear 12 when installed on the lapping machine, and the assembly distance H of the pinion gear 10 are set so that the tooth contact position is at the center of the tooth surface. The backlash is adjusted by the assembly distance G of the ring gear 12. This assembly distance G can be changed by moving the pinion gear 10 or ring gear 12 in the direction of the assembly distance G, that is, in the vertical direction in FIG. 2, using a moving device comprising a motor, a feed screw, and the like. Further, the pinion gear lO is centered around a predetermined swing center P that is perpendicular to a plane that includes the direction of its assembly distance H and the direction of the off-plane V, in other words, a plane that is parallel to the plane of the paper in FIG. It is designed to be swung by a swiveling device equipped with a cam device or a cylinder. The pinion gear 10 and ring gear 12 are hypoid gears that are disposed in the power transmission path of an automobile and are used in mesh with each other, forming a pair of conical gears. The axis l and the axis m of the ring gear 12 intersect at right angles when viewed from above in FIG.

When lapping the pinion gear 10 and ring gear 12, the rotation drive device rotates the pinion gear 10 to mesh and rotate the pinion gear 10 and ring gear 12, and the rocking device rotates the pinion gear 10. is swung around the swiveling center P.

Here, the above-mentioned swing center P is set to the axis m of the ring gear 12 as the origin 0 as shown in FIG. If the rocking angle of the pinion gear 10 is θ (positive in the counterclockwise direction), the amounts of change Δ■ and ΔH in the offset v and the assembly distance H are expressed by the following equations (1
) and (2). Note that when the swing angle is +θ, the offset is the dimension between the origin O and the point O3, and the assembly distance is the dimension between the point O1 and the point R. Further, when the swing angle is −θ, the offset is the dimension between the origin 0 and the point o2, and the assembly distance is the dimension between the point 0□ and the point R2.

ΔV=VCO3θ+h sinθ−v =−(
11ΔH=h cos θ-v sin θ-h ・
--(2) For example, when the pivoting center P is at the position shown in FIG. 3 and the pinion gear 10 is swung to the angle shown by the two-dot chain line and the broken line in FIG. , ΔV, and ΔH are shown in FIG. Therefore, ΔH becomes 0.

On the other hand, when the pinion gear 10 is left-handed and the ring gear 12 is right-handed, when lapping is performed by rotationally driving the pinion gear 10 in the direction shown by the arrow in FIGS. 1 and 2, the pivot center When P is at the position shown in FIG. 3 and the above ΔV is 0, that is, when the offset V becomes large, the tooth contact position on the tooth surface of the ring gear 12 is as shown by →■゛ in FIG. is moved toward the tip of the tooth on the small end side, and Δ■ becomes −
In other words, when the offset V becomes smaller, the tooth contact position is moved toward the root of the tooth on the large end side, as shown by →V-. Also, when ΔH is 0, that is, the assembly distance H
When ΔH increases, the tooth contact position is moved toward the tip of the tooth on the large end side, as shown by -H, and when ΔH is -, that is, when the assembly distance H becomes small, the tooth contact position is -H-. As shown, it is moved toward the root of the tooth on the small end side.

Therefore, when the swing angle θ at which ΔV is ten and ΔH is negative is ten, the tooth contact position on the tooth surface of the ring gear 12 is moved to the small end side as shown in FIG. When the swing angle θ at which ΔV is negative and ΔH is ten is negative, the tooth contact position on the tooth surface of the ring gear 12 is moved toward the large end side. As a result, the entire tooth surface is lapped. Note that the moving path of the tooth contact position during this swinging, that is, the ratio of Δ■ and ΔH, can be adjusted as appropriate by changing the position of the swinging center P.
The moving speed can be adjusted by changing the position of the swing center P and the swing speed. The swing center P can be changed in the same way as in the conventional SPC method, for example, by moving the entire swing device using an XY child table, or if the swing device uses a cam device. This can be done by changing the attitude of the cam.

As described above, according to the lapping method of the present embodiment, the entire tooth surface can be lapped by simply swinging the pinion gear 10 around the swing center P. Even if the device is included, the device can be easily configured. Moreover, since the pinion gear 10 is oscillated in one plane including the direction of the assembly distance H and the direction of the offset v, changes in the meshing state with the ring gear 12 at that time, such as the direction of movement of the tooth contact position, etc. teeth,
It is very similar to the case under load when the pinion gear 10 and ring gear 12 are actually used in mesh with each other, and a good lapping finish is performed in consideration of the magnitude of the load and deformation of the carrier during use. is possible,
Gear noise etc. can be effectively reduced.

In contrast, the conventional V&H lapping method
By independently moving the pinion gear 10 in the direction of the offset ■ and in the direction of the assembly distance H, that is, in the vertical and horizontal directions in FIG. 1, the tooth contact position is moved in the tooth width direction, so backlash can be reduced. Adding a mechanism for adjustment required a drive mechanism for a total of three directions. Further, since the pinion gear 10 is simply moved in parallel, the change in the meshing state with the ring gear 12 at that time does not necessarily match the change in the meshing state during actual use.

In addition, in the SPC lapping method, the pinion gear 10 is swung in the angular direction of the shaft, that is, around the oscillation center perpendicular to the plane of the paper in FIG. Although the amount of change in H and the backlash can be adjusted and the device is easily constructed, the change in the meshing state between the pinion gear 10 and the ring gear 12 during rocking is significantly different from the change in the meshing state during actual use. There is.

Although one embodiment of the present invention has been described above in detail based on the drawings, the present invention can also be implemented in other embodiments.

For example, in the embodiment described above, the pinion gear 10 is set to the pivot center P
It is designed to swing around, but the ring gear 1
2 may be swung around the swiveling center P.

Further, a swing center perpendicular to a plane including the direction of the assembly distance G of the ring gear 12 and the direction of the offset ■, in other words, a swing center parallel to the axis l of the pinion gear 10 is set, and the swing center is It is also possible to make the pinion gear 10 and ring gear 12 swing relative to each other.

Furthermore, in the above embodiment, the case where the swing center P is set at a position where the coordinate V in the offset direction and the coordinate in the assembly distance direction are both positive as shown in FIG. 3 has been described. The position of the center of swing P can be arbitrarily determined, including the case where the coordinates ■ and h are negative.

Furthermore, in the embodiment described above, the axis l of the pinion gear 10 and the axis m of the ring gear 12 intersect at right angles in the plan view of FIG.
The present invention is similarly applicable to the case where the two intersect diagonally.

Further, in the above embodiment, a case where a hypoid gear is lapped has been described, but the present invention can be similarly applied to a case where a bevel gear that is meshed without an offset is lapped. In that case, the pair of gears will be relatively oscillated around a oscillation center perpendicular to a plane that includes the assembly distance direction of one gear and the direction in which the offset is applied.

Although other examples are not provided, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the meshing state of hypoid gears attached to a lapping machine that performs lapping according to the present invention. FIG. 2 is a plan view of FIG. 1. FIG. 3 is a diagram illustrating changes in assembly distance and offset during rocking during lapping using the lapping machine shown in FIG. 1. Figure 4 shows the assembly distance during the swinging shown in Figure 3;
It is a figure explaining an offset and a change of a tooth contact position. FIG. 5 is a diagram illustrating the direction of movement of the tooth contact position as the assembly distance and offset change during the swing shown in FIG. 3. lO: Pinion gear 12: Ring gear H: Assembly distance V: Offset P: Swing center Applicant Toyota Motor Corporation No. 11IA Fig. 2 Fig. 4

Claims (1)

[Claims] When a pair of conical gears that are used in mesh with each other are meshed and rotated for lapping finishing, the pair of gears are moved relative to each other so that the assembly distance and offset of one gear change. A lapping method in which the entire tooth surface is lapped by moving the tooth contact position in the tooth width direction of the tooth surface by A method for lapping gears, characterized in that the assembly distance and offset are changed by relatively swinging the pair of gears about a predetermined swing center.