JPS6048214A - Method for finishing surface of hypoid gear - Google Patents

Abstract

PURPOSE:To provide highly finished surface, by exerting load on one gear thereby causing the other gear to rotate and by adapting the contact position between both the gears to vary cyclically. CONSTITUTION:Load is exerted on a larger gear 1, which is in mesh engagement with a smaller gear 2, and the smaller gear 2 is thus caused to rotate. Then, representing the distance between the center axis of the larger rear 1 and the bottom face of the smaller gear 2 by H and the distance between the center axis of the smaller gear 2 and the bottom face of the larger gear 1 by G, the smaller gear 2 is moved so that the distance G is cyclically varied by DELTAG and the distance H is cyclically varied by DELTAH, and further, the smaller gear 2 is swung in the plane perpendicular to the bottom face of the larger gear 1. Thus, irregularities on the gear surfaces are removed by contact surface pressure between the larger gear and the smaller gear, and smaller value of surface roughness is provided.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a method for finishing hypoid gear tooth surfaces.

[Background of the invention] Large gears and small gears that make up hypoid gears are conventionally manufactured through the following process: blank processing → rough gear cutting → finishing gear cutting → hardening → lapping, and large gears are further subjected to lubrite treatment. It had been.

The tooth surfaces of hypoid gears manufactured in this way were also finished with a small surface roughness, but in order to reduce the amount of heat generated by the no-void gear and increase the durability of the tooth surfaces, the tooth surfaces were finished with a small surface roughness. I need to finish it.

[Object of the Invention] The present invention was devised in response to such demands, and an object of the present invention is to provide a method for finishing the tooth surface of a hypoid gear, which can finish the tooth surface to a surface roughness smaller than that of the conventional method.

[Summary of the invention]

The method for finishing the tooth surface of a void gear according to this invention is as follows:
This device uses the contact pressure between the large gear and the small gear to eliminate unevenness on the tooth surface.While applying a load to one gear, the other gear is driven to rotate, and at the same time, the tooth contact position between both gears changes periodically. The relative position of both gears is changed periodically as shown in FIG.

[Embodiments of the invention]

Next, a first embodiment of the tooth surface finishing method according to the present invention will be described based on the drawings.

In this embodiment, after lapping as in the conventional case, a large gear 1 and a small gear 2 are assembled as shown in FIGS. 1 and 2.
and mesh with each other, and finish the tooth surface as follows.

I) Apply load to large gear. As a method of applying the load, a male friction piece (not shown) is brought into sliding contact with the outer periphery of the large gear 1.
Alternatively, a small gear other than the small gear 2 (not shown) may be meshed with the large gear 1, and the rotation shaft of this small gear may be braked.
There are various methods.

11) Drive the small gear 2 to rotate.

111) The distance between the central axis C1 of the large gear 1 and the bottom of the small gear 2 is H1, the distance between the central axis C2 of the small gear 2 and the bottom of the large gear 1 is G, and the distance between the central axes C1 and C2 is V. When the small gear 2 is moved, G is periodically varied by ΔG, H is periodically varied by ΔH, and the small gear 2 is oscillated in a plane perpendicular to the bottom surface of the large gear 1. move (first
It is indicated by an arrow ΔS in the figure. ). By periodically varying the relative positions of the large gear 1 and the small gear 2 in this way, the tooth contact positions of both gears 1.2 will vary periodically, thereby causing the gears 1.
The convex portion of the entire tooth surface of No. 2 is crushed and removed.

1v) During this so-called grinding, both gears 1
．． Since the tooth surfaces of No. 2 are heated by frictional heat, it is desirable to supply low-viscosity lubricating oil to the tooth surfaces to cool them. Furthermore, the use of low-viscosity lubricating oil will further enhance the sealing effect.

#lI, Figures 3 and 4 show a second embodiment of the invention, in which the small gear 2 is not moved periodically, but the large gear 1 is moved periodically. In this case, G is periodically varied by ΔG, H is periodically varied by ΔH, and ■ is periodically varied by ΔV. This embodiment also provides the same effects as the first embodiment. However, since the large gear 1 on the driven side is periodically moved without moving the small gear 2 on the driving side, the device for periodic movement is simplified.

FIG. 5 shows a cross-sectional curve of a tooth surface that has been lapped, and FIG. 6 shows a cross-sectional curve of a tooth surface that has been finished in the first embodiment or the second embodiment. It can be seen that the surface roughness is significantly reduced.

[Effects of the Invention] As described above, the tooth surface finishing method for hypoid gears according to the present invention eliminates the unevenness of the tooth surface by the contact surface pressure between the large gear and the small gear, so the surface roughness is improved compared to the conventional method. This has the excellent effect of making it smaller.

As the surface roughness decreases, the generation of frictional heat decreases,
It can prevent the tooth surface strength from decreasing due to heat generation, and it also has the effect of preventing the lubricating oil temperature from rising and bearing damage.
,

[Brief explanation of drawings]

Fig. 1 is a front view of a hypoid gear for explaining a first embodiment of the tooth surface finishing method according to the present invention, and Fig. 2 is a front view of a hypoid gear.
Fig. 3 is a front view of the hypoid gear in the second embodiment, Fig. 4 is a bottom view of Fig. 3, Fig. 5 is a graph showing the cross-sectional curve of the tooth surface after lapping, and Fig. 6 is a graph showing the cross-sectional curve of the tooth surface obtained in the above example, 1... large gear, 2... small gear, CI, C2... center axis, G, H, V... distance . Agent Tatsuyuki Unuma (and 1 other person) Figure 1 ■ Figure 3 Figure 4

Claims (1)

[Claims] (1) After lapping the large gear and small gear that make up the hypoid gear, they are meshed with each other, and while applying a load to one gear, the other gear is rotated, and at the same time, the multiple tooth contact positions between both gears are adjusted. A hypoid gear tooth surface finishing method that changes the relative position of both gears periodically.