JPH0517725Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pinion structure of a totalizer used in automobile odometers and the like.

[Conventional technology]

Conventionally, this type of totalizer has been known as disclosed in Japanese Utility Model Application Publication No. 56-146209, Japanese Utility Model Application Publication No. 57-185069, and the like.

8 to 13 show a conventional structure, in which a plurality of number rings 2 are rotatably inserted through a support shaft 1 provided on a frame (not shown), and the lower digit sides of each number ring 2 are 20 internal gear-shaped continuous teeth 3 on the surface
, and two intermittent teeth 4 and 5 in the shape of an internal gear wheel are formed on the side surfaces of the upper digit of each number ring 2, and a holder 6 is fixed by being locked to a frame etc. between each number ring 2. The holder 6 has continuous teeth 3 and adjacent intermittent teeth 4 and 5.
A pinion 8 is provided with six teeth 7 that can be engaged simultaneously with the pinion 8, and the teeth 7 are alternately provided with long teeth 7a with a long tooth width and short teeth 7b with a short tooth width. A locking surface 10 that can face one side of the short tooth 7b on the side
A locking circumferential surface 11 that can simultaneously face the top surfaces of two adjacent long teeth 7a is provided in a region other than the valley 12 between the intermittent teeth 4 and 5, and a driving gear is attached to the continuous tooth 3 of the lowest numerical ring 2. 1
3 can be engaged with each other.

When the drive gear 13 is rotated, the lowest number wheel 2 also rotates in the direction of the solid line arrow in FIG. 10, and when the lowest number wheel 2 rotates once as shown in FIG. meshes with the pinion 8, and the pinion 8 rotates 1/3 of a turn. Due to the meshing of the upper digit side of this pinion 8 and the continuous tooth 3 of the number wheel 2 of the next row, the number wheel 2 of the next row becomes 1/10. It rotates to perform a digit movement, and each number wheel 2 can display an integrated value.

In addition, except during the shifting movement, the short teeth 8b of the pinion 8 face the locking surface 10, and the top surfaces of the two adjacent long teeth 7a simultaneously oppose the locking peripheral surface 11, as shown in FIG. Regulating the rotation of pinion 8, number wheel 2
prevents unexpected rotation.

[Problem that the invention attempts to solve]

However, the pinion of the above conventional structure
As shown in FIGS. 2 and 13, the long teeth 7a and short teeth 7b are alternately provided, in this case six teeth 7, and the upper digit sides of the long teeth 7a and short teeth 7b mesh with the continuous teeth 3. , since only the lower girder side of the long teeth 7a meshes with the valley 12 between the intermittent teeth 4 and 5, the assembly directionality inevitably occurs in the axial direction of the pinion 8, and the pinion is generally small. Due to the shape, it is difficult to determine the direction of assembly and assemble it, which reduces assembly efficiency, and the directionality makes it difficult to automate assembly. ing.

[Means for solving problems]

The purpose of this invention is to eliminate these inconveniences.The gist of this invention is to rotatably provide a plurality of number rings on the support shaft, and form a plurality of continuous teeth on the lower digit side of the number ring. In a totalizer that has intermittent teeth on the upper digit side of the number ring and a pinion that has multiple teeth that can simultaneously mesh with continuous teeth and adjacent intermittent teeth, the teeth of the pinion are arranged in the axial direction. The pinion structure of the totalizer is characterized in that the pinions are provided alternately biased to the pinions.

[Effect]

The plurality of teeth of the pinion are deviated in the axial direction, and the directionality of assembly is lost.

〔Example〕

Figures 1 to 7 show embodiments of the present invention, Figures 1 to 4 are the first embodiment, Figures 5 and 6 are the second embodiment, and Figure 7 is the third embodiment. It is.

Incidentally, the same reference numerals are given to the same parts as the conventional structure shown in FIGS. 8 to 13.

In the first embodiment shown in FIGS. 1 to 4, 8 is a pinion, and in this case, six teeth 7 are provided which are offset alternately in the axial direction, with the tooth width being x and the length of the step 9 being y. The steps 9 are alternately provided on the left and right sides of the pinion 8.

Since this first embodiment has the above-mentioned configuration, there is no directionality in assembling the pinion 8 in the axial direction, and the assembling efficiency can be improved, and the steps 9 are provided alternately on the left side and the right side of the pinion 8. As a result, the action of the short teeth 7b and long teeth 7a of the conventional structure can be obtained, and the unexpected rotation of the pinion 8 can be restricted by cooperation with the locking surface 10 and the locking peripheral surface 11. .

In the embodiments shown in FIGS. 5 and 6, the present invention is applied to a pinion 8 of a so-called outer pinion type totalizer.

In this case, 20 external gear-shaped continuous teeth 3 are formed on the lower digit side of the number ring 2, and two external gear-shaped intermittent teeth 4, 5 are formed on the upper digit side of the adjacent number ring 2. A locking surface 10 and a locking peripheral surface 11 are provided on the upper digit side of the number ring 2.
is formed in areas other than the valley portions 12 of intermittent widths 4 and 5.

Similarly to the first embodiment, this pinion 8 is also provided with eight teeth 7 that are alternately offset in the axial direction, and steps 9 are provided alternately on the left and right sides of the pinion 8.

This second embodiment also obtains the same effects as the first embodiment.

In the case of the pinion 8 of the above embodiment, the tooth width x of the adjacent teeth 7 and the length y of the step 9 are made equal, but the tooth width x and the length of the step 9 may be different.

It can also be applied to a third embodiment shown in FIG. 7 in which a boss portion 14 is provided on the side of the pinion 8 to reduce rotational resistance.

[Effect of idea]

As described above, the present invention eliminates the directional assembling of the pinion in the axial direction, thereby improving the assembling efficiency.

As described above, the intended purpose can be fully achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view of the pinion of the first embodiment, FIG. 2 is a side view thereof, FIG. 3 is a perspective view thereof, and FIG. 4 is a partial sectional view. , Fig. 5 is a side view of the second embodiment, Fig. 6 is a sectional view thereof, Fig. 7 is a side view of the pinion of the third embodiment, Fig. 8 is an exploded perspective view of the conventional structure, Fig. 9, 1
0 and 11 are explanatory diagrams of its operation, FIG. 12 is its front view, and FIG. 13 is its side view. 1...Support shaft, 2...Number ring, 3...Continuous teeth,
4, 5...Intermittent tooth, 7...Tooth, 8...Pinion.

Claims (1)

[Scope of utility model claims] A plurality of number rings are rotatably provided on the support shaft, a plurality of continuous teeth are formed on the lower digit side of the number ring, intermittent teeth are formed on the upper digit side of the number ring, and intermittent teeth adjacent to the continuous teeth are formed on the upper digit side of the number ring. 1. A pinion structure of a totalizer, characterized in that the pinion is provided with a pinion having a plurality of teeth that can be simultaneously meshed with teeth, wherein the teeth of the pinion are provided so as to be alternately offset in the axial direction.