JP5217288B2 - Lapping method, lapping machine, and lapping gear - Google Patents

Description

  The present invention relates to a lapping method, a lapping device, and a lapping gear for polishing a tooth surface of a gear.

  In recent years, a gear made of nylon is engaged with a steel work gear, and the tooth surface of the work gear is polished by rotating with a wrap compound as a wrapping agent interposed therebetween, and the tooth surface roughness is greatly improved. A lapping method is used (for example, see Patent Document 1).

However, in this method, since the teeth of the nylon gear are easy to bend, the amount of bending of the teeth of the nylon gear greatly fluctuates when the number of simultaneously meshing teeth changes in the lapping process, and the gear to be processed is processed. There is a risk of causing problems in the shape of the tooth surface.
JP 2000-343328 A

  The present invention has been made in order to solve the problems associated with the above-described prior art, and provides a lapping method, a lapping apparatus, and a lapping gear that can reduce defects in the tooth surface shape of the gear to be processed. Objective.

The lapping method according to the present invention that achieves the above object comprises rotating a gear to be machined and a gear for lapping meshing with the gear to be machined while meshing with a lapping agent containing abrasive grains interposed therebetween. A lapping method for polishing a tooth surface of a gear to be machined while changing the number of simultaneously meshing teeth of a processing gear and a lapping gear, wherein the number of teeth of the lapping gear is relatively small. The bending rigidity of at least a part of the first meshing portion that is a portion that contacts the workpiece gear is larger than the bending rigidity of the second meshing portion that is a portion that contacts the workpiece gear with a relatively large number of simultaneously meshing teeth. It is large.

A lapping apparatus according to the present invention that achieves the above object rotates a gear to be machined and a lapping gear to be meshed with the gear to be machined while meshing with a lapping agent including abrasive grains interposed therebetween. A lapping apparatus for polishing a tooth surface of a gear to be machined while changing the number of simultaneously meshing teeth of a processing gear and a lapping gear, wherein the number of teeth of the lapping gear is relatively small. The bending rigidity of at least a part of the first meshing portion that is a portion that contacts the workpiece gear is larger than the bending rigidity of the second meshing portion that is a portion that contacts the workpiece gear with a relatively large number of simultaneously meshing teeth. It is large.

The lapping gear according to the present invention that achieves the above object rotates while changing the number of simultaneously meshing teeth with the workpiece gear while meshing with the workpiece gear with a lapping agent containing abrasive grains interposed therebetween, A lapping gear for polishing a tooth surface of the gear to be processed, wherein the teeth of the first meshing portion, which is a portion of the teeth of the lapping gear that are in contact with the workpiece gear with a relatively small number of simultaneously meshing teeth. It is characterized in that at least a part of the bending rigidity is larger than the bending rigidity of the second meshing portion which is a portion in contact with the workpiece gear with a relatively large number of simultaneously meshing teeth.

The lapping method, the lapping device, and the lapping device according to the present invention configured as described above have a bending rigidity of at least a part of the first meshing portion that contacts the workpiece gear with a relatively small number of simultaneously meshing teeth, Since it is larger than the flexural rigidity of the second meshing portion contacting the gear to be machined with a relatively large number of simultaneously meshing teeth, even if the number of simultaneously meshing teeth changes during processing, the variation in the amount of flexure of the teeth is suppressed, It is possible to reduce defects in the tooth surface shape of the gear to be processed.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

<First Embodiment>
1 is a partial perspective view showing a lapping apparatus according to a first embodiment of the present invention, FIG. 2 is a partial perspective view showing enlarged teeth of a processing gear of the lapping apparatus, and FIG. It is a fragmentary perspective view which expands and shows the tooth | gear of the other example of the processing gear of the lapping apparatus.

  As shown in FIGS. 1 and 2, the lapping apparatus 1 according to the first embodiment of the present invention polishes the tooth surface of the hypoid gear and performs a finishing process. It has a processing gear 3 (lapping gear) that meshes with the processing gear 2 to polish the tooth surface of the gear 2 to be processed, and a lapping agent that is a lapping compound mixed with abrasive grains is interposed in the meshing portion. Finishing is performed by rotating while rotating. In the present embodiment, the ring gear of the hypoid gear is the workpiece gear 2 and the pinion gear is the processing gear 3, but the reverse may be possible.

  The workpiece gear 2 and the machining gear 3 are fixed to a rotatable drive shaft 4 and a driven shaft 5, respectively.

  The drive shaft 4 is rotatably supported by a bearing (not shown) and is connected to a drive source (not shown) such as a motor. The drive shaft 4 is arbitrarily rotated by being controlled by a control unit (not shown). Rotate by number. The driven shaft 5 is rotatably supported by a bearing (not shown) and is connected to a load (not shown) such as a brake.

  The work gear 2 is metallic, and the meshing surface of the teeth meshing with the machining gear 3 becomes the work surface 6 to be polished. The processing gear 3 is made of nylon, and the meshing surface of the teeth meshing with the workpiece gear 2 is a polished surface 7 for polishing the workpiece surface 6 of the workpiece gear 2. Note that the processing gear 3 is not limited to nylon, and may be formed of other resins.

  The number of teeth (simultaneously meshed teeth) simultaneously meshed with the workpiece gear 2 and the machining gear 3 changes when rotating, and the number of simultaneously meshed teeth is 1 or 2 in this embodiment. Accordingly, the grinding surface 7 of the processing gear 3 has a first meshing portion 8 that meshes with the workpiece surface 6 with the number of simultaneously meshing teeth 1 and a second meshing portion that meshes with the workpiece surface 6 with the number of simultaneous meshing teeth 2. 9, and the second meshing portion 9 is located on both ends of the first meshing portion 8 in the tooth width direction.

When processing a gear having two or three simultaneous meshing teeth, the first meshing portion 8 meshes with two simultaneous meshing teeth and the second meshing portion 9 meshes with three simultaneous meshing teeth. It becomes. Further, when processing a gear having a higher number of simultaneously meshing teeth, the number of simultaneously meshing teeth of the second meshing portion is higher than the number of simultaneously meshing teeth of the first meshing portion.

  On the rear surface 12 of the meshing surface of the processing gear 3, a projecting portion 10 is provided at a portion corresponding to the first meshing portion 8 to form a thick portion having a thick tooth thickness. Accordingly, the tooth thickness at the first meshing portion 8 is formed to be thicker than the tooth thickness of the second meshing portion 9, and the flexural rigidity of the first meshing portion 8 is higher than the flexural rigidity of the second meshing portion 9. Further, the protrusion 10 has a smooth step 11 so that stress concentration can be prevented. In addition, the protrusion part 10 does not need to be formed in complete agreement with the first meshing part 8, and may be formed in a part of the part corresponding to the first meshing part 8. The projecting portion 10 is preferably molded integrally with the processing gear 3, but may be separately molded and fixed with an adhesive or the like, or a portion corresponding to the second meshing portion 9 of the back surface 12 may be formed. You may cut and form.

  Further, as in another example of the processing gear 13 shown in FIG. 3, the step 14 is not necessarily smooth.

  Next, a lapping method will be described.

  First, the work gear 2 is fixed to the drive shaft 4, and the gears 2 and 3 are meshed with each other while the processing gear 3 is fixed to the driven shaft 5. Next, while supplying the wrapping agent to the portion where the teeth mesh, the control unit controls the drive source to rotate the drive shaft 4 (the gear 2 to be processed) at a predetermined rotational speed. At this time, since the driven shaft 5 is connected to the load, the work surface 6 of the work gear 2 comes into contact while receiving a force from the polishing surface 7 of the work gear 3. Thereby, the abrasive grains are pressed against the work surface 6 by the resin-made polishing surface 7, and the work surface 6 is polished. A gear finished by polishing the work surface 6 is reduced in friction loss due to meshing, an increase in oil temperature is suppressed, and fuel efficiency is improved.

  In this lapping process, the number of simultaneously meshing teeth varies alternately between 1 and 2. Therefore, for example, when the projecting portion 10 is not provided on the gear 2 to be machined, in the case where the number of simultaneously meshing teeth is 1 and 2, the combined flexural rigidity (total flexural rigidity K) of all the teeth meshing simultaneously. The difference increases. That is, the smaller the number of simultaneously meshed teeth, the lower the total flexural rigidity K. Therefore, the total flexural rigidity K1 when the number of simultaneously meshed teeth is 1 is larger than the total flexural rigidity K2 when the number of simultaneously meshed teeth is 2. Accordingly, the amount of deflection X1 when the number of simultaneously meshing teeth is 1 becomes larger than the amount of deflection X2 when the number of simultaneously meshing teeth is 2. Therefore, when the number of simultaneously meshing teeth varies, for example, when the number of simultaneously meshing teeth changes from 2 to 1, the total bending rigidity K of the processing gear 3 is reduced, and excessive bending is likely to occur. There is a possibility that interference with the workpiece gear 2 may occur at the tooth tip portion of the back surface 12 of the tooth, causing a problem in meshing. Further, even if the above-described interference does not occur, the nonuniformity of the total flexural rigidity K of the teeth may cause an undesirable rotational fluctuation. When such interference and rotational fluctuation occur, the margin of the work surface 6 becomes non-uniform, causing the tooth surface shape to collapse.

  However, in the lapping method according to the present embodiment, the protruding portion 10 is provided corresponding to the first meshing portion 8, so that the flexural rigidity of the first meshing portion 8 is higher than the flexural rigidity of the second meshing portion 9. Therefore, the total flexural rigidity K1 when the number of simultaneously meshing teeth is 1 is improved, and can be approximately the same as the total flexural rigidity K2 when the number of simultaneously meshing teeth is 2, and the difference in the flexure amount X is also reduced. To do. Therefore, even if the number of simultaneously meshing teeth changes when the gear rotates, the fluctuation of the total flexural rigidity K can be reduced, and the occurrence of the interference and the rotation fluctuation as described above can be suppressed. Can be made uniform, and deformation of the tooth surface shape can be suppressed.

Second Embodiment
FIG. 4 is an enlarged partial perspective view showing teeth of a processing gear of a lapping apparatus according to a second embodiment of the present invention. In addition, about the site | part which has the same function as 1st Embodiment, the same code | symbol is used and in order to avoid duplication, the description is abbreviate | omitted.

  The lapping apparatus according to the second embodiment differs from the lapping apparatus 1 according to the first embodiment shown in FIG. 1 only in the structure of the processing gear 22. That is, in the processing gear 22 in the second embodiment, as shown in FIG. 4, the protruding portion 10 is not provided on the back surface 23 of the meshing surface, and at least a part of the portion corresponding to the first meshing portion 24 is the first. It is formed of a material having higher rigidity than the two meshing portions 25. The materials of the first meshing portion 24 and the second meshing portion 25 are both made of resin, and are formed of, for example, nylon having different rigidity. Thereby, the bending rigidity in the 1st meshing part 24 can be made higher than the bending rigidity of the 2nd meshing part 25. FIG.

  Such a processing gear 22 is preferably integrally molded by two-color molding or the like, but may be fixed by an adhesive or the like after being molded as a separate member. Since the effect is the same as that of the first embodiment, the description thereof is omitted.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the gear to be machined and the gear to be machined are not limited to hypoid gears, and may be gears having other structures. In particular, if the gear has a torsion angle, such as a helical gear or a spiral bevel gear, the second meshing portion is provided on both sides of the first meshing portion in the tooth width direction as in the above-described embodiment. Located and can be easily applied. FIG. 5 is an enlarged partial perspective view showing the teeth of the processing gear 31 when the present invention is applied to a spur gear. However, even a gear having no torsion angle such as a spur gear may be used. As shown in FIG. 5, a protrusion 32 (or a highly rigid portion) extending in the tooth width direction can be provided.

It is a fragmentary perspective view which shows the lapping apparatus which concerns on the 1st Embodiment of this invention. It is a fragmentary perspective view which expands and shows the tooth | gear of the gear for a process of the lapping apparatus.

It is a fragmentary perspective view which expands and shows the tooth | gear of the other example of the processing gear of the lapping apparatus. It is a fragmentary perspective view which expands and shows the teeth of the processing gear of the lapping apparatus according to the second embodiment of the present invention. It is a fragmentary perspective view which expands and shows the tooth | gear at the time of applying this invention to a spur gear.

Explanation of symbols

1 lapping machine,
2 Work gear,
3, 13, 22, 31 processing gear,
4 Drive shaft,
5 driven shaft,
6 Work surface,
7 Polished surface,
8, 24 1st meshing part,
9, 25 second meshing part,
10, 32 protrusion,
11, 14 steps,
13, 23 back,
K, K1, K2 Total flexural rigidity,
X, X1, X2 Deflection amount.

Claims (18)

The gear to be machined and the gear for lapping that meshes with the gear to be machined are rotated while meshing with a lapping agent containing abrasive grains, and the number of simultaneously meshing teeth of the gear to be machined and the gear for lapping is changed. A lapping method for polishing the tooth surface of the gear to be processed,
The bending rigidity of at least a part of the first meshing portion, which is a portion that contacts the gear to be machined with a relatively small number of simultaneous meshing teeth of the wrapping gear teeth, is a relatively large number of simultaneously meshed teeth. A lapping method characterized by being larger than the flexural rigidity of the second meshing portion which is a portion in contact with the workpiece gear.   2. The lapping method according to claim 1, wherein at least a part of the first meshing portion of the teeth of the lapping gear has a thick portion having a tooth thickness larger than that of the second meshing portion.   3. The lapping method according to claim 2, wherein the compacted portion has a projecting portion that projects to the back side of the meshing surface of the teeth of the lapping gear with the gear to be machined.   The at least one part of the 1st meshing part of the tooth | gear of the said wrapping gear is formed from the material whose rigidity is higher than the material of the said 2nd meshing part, The any one of Claims 1-3 characterized by the above-mentioned. Wrapping method described in 1.   The lapping method according to any one of claims 1 to 4, wherein the lapping gear is made of resin.   The gear to be processed and the gear for lapping are hypoid gears, and the second meshing portion of the gear for lapping is positioned on both sides in the tooth width direction with respect to the first meshing portion. The lapping process method of any one of -5. The gear to be machined and the gear for lapping that meshes with the gear to be machined are rotated while meshing with a lapping agent containing abrasive grains, and the number of simultaneously meshing teeth of the gear to be machined and the gear for lapping is changed. A lapping machine for polishing the tooth surface of the gear to be machined,
The bending rigidity of at least a part of the first meshing portion, which is a portion that contacts the gear to be machined with a relatively small number of simultaneous meshing teeth of the wrapping gear teeth, is a relatively large number of simultaneously meshed teeth. A lapping apparatus characterized by being larger than a flexural rigidity of a second meshing portion which is a portion in contact with a workpiece gear.   8. The lapping apparatus according to claim 7, wherein at least a part of the first meshing portion of the teeth of the lapping gear has a thick portion having a tooth thickness larger than that of the second meshing portion.   The lapping apparatus according to claim 8, wherein the compacted part has a projecting part that projects to the back side of the meshing surface of the tooth of the lapping gear with the gear to be machined.   The at least one part of the 1st meshing part of the tooth | gear of the said lapping gear is formed from a material higher in rigidity than the material of the said 2nd meshing part, The any one of Claims 7-9 characterized by the above-mentioned. Wrapping device as described in 1.   The lapping machine according to any one of claims 7 to 10, wherein the lapping gear is made of resin.   The gear to be processed and the lapping gear are hypoid gears, and the second meshing portion of the lapping gear is located on both sides in the tooth width direction with respect to the first meshing portion. The lapping apparatus of any one of -11. A lapping gear that rotates while changing the number of teeth simultaneously meshed with the workpiece gear while meshing with the workpiece gear with a lapping agent containing abrasive grains interposed, and polishing the tooth surface of the workpiece gear. There,
The bending rigidity of at least a part of the first meshing portion, which is a portion that contacts the gear to be machined with a relatively small number of simultaneous meshing teeth of the wrapping gear teeth, is a relatively large number of simultaneously meshed teeth. A lapping gear that is larger than a bending rigidity of a second meshing portion that is a portion in contact with a workpiece gear.   14. The lapping gear according to claim 13, wherein at least a part of the first meshing portion includes a thick portion having a tooth thickness larger than that of the second meshing portion.   15. The lapping gear according to claim 14, wherein the compacted portion has a protruding portion that protrudes to the back side of the meshing surface with the workpiece gear.   The lapping gear according to any one of claims 13 to 15, wherein at least a part of the first meshing portion is formed of a material having rigidity higher than that of the second meshing portion. .   The lapping gear according to any one of claims 13 to 16, wherein the lapping gear is formed of a resin.   18. The lapping gear according to claim 13, wherein the second meshing portion is a hypoid gear positioned on both sides in the tooth width direction with respect to the first meshing portion.

Images