JPS647401Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a totalizer used in speedometers, wattmeters, odometers, etc., and particularly relates to a connecting structure of a character wheel, a pinion, and a pinion seat. .

[Conventional technology]

Figures 6 and 7 show conventional totalizers.
Total shaft 1 supported by chassis (not shown)
A plurality of character wheels 2 are rotatably arranged in sequence,
The character wheels 2 are sequentially shifted by pinions 3 provided between the character wheels 2. This pinion 3 is of a type that meshes with an internal gear 2a formed on the inner peripheral wall of the character wheel 2, and a pinion shaft 5 is provided on a plate-shaped pinion seat 4 fixed between the character wheels 2.
It is rotatably supported by. The pinion seat 4 has a through hole 4a in the center for inserting the total shaft 1, and a U-shaped notch 4b formed in a part of the outer circumference engages with a positioning shaft 6 supported by the chassis. This determines the relative position of the pinion 3 and the character wheel 2.

FIG. 8 is an exploded perspective view of the total shaft 1, character wheel 2, pinion 3, and pinion seat 4. The total shaft 1 is formed in the character wheel 2 and passes through through holes 4a having approximately the same diameter in order.

[Problem that the invention attempts to solve]

By the way, in the case of the conventional totalizer as mentioned above,
The structural members are made of synthetic resin, metal, etc., and in order to eliminate the effects of thermal expansion and contraction of the parts, it is necessary to provide a relatively large clearance between each part in the thrust direction. Looking at the above structure of the pinion seat 4, its position is restricted only by the engagement between the total shaft 1 and the through hole 4a, and the engagement between the notch 4b and the positioning shaft 6, and the restriction direction is mainly In the direction of rotation with respect to the total axis 1, an appropriate clearance is provided between the side surfaces of adjacent character wheels 2.
The pinion seat 4 is supported by a holding structure that is easily tilted with respect to the thrust direction. Therefore,
In the conventional device, when the pinion seat 4 is tilted, the pinion 3 is tilted, and the pinion 3 and the character wheel 2 are tilted.
This has disadvantages such as misalignment with the internal teeth 2a, resulting in poor character alignment and an inoperable lock state of the totalizer, and it is also complicated to adjust the clearance in the thrust direction during assembly.

[Means for solving problems]

In view of the above points, the present invention aims to provide a totalizer that prevents the pinion seat from tilting, improves the alignment of the letters, makes the operation smooth, and facilitates adjustment during assembly. In this structure, a support shaft that serves as a rotating shaft of the character wheel is provided protruding from the center of the pinion seat, and the tip of this support shaft is engaged with a recess provided in the center of the adjacent pinion seat. This makes it possible to connect the character wheel, pinion, and pinion seat without using a total shaft.

〔Example〕

1 to 3 show a first embodiment of the present invention, and as shown in the figures, a support shaft 4c with a circular cross section that protrudes to one side of the pinion seat 4 is integrally formed in the center of the pinion seat 4. It is set up. This support shaft 4c has an engaging portion 4d with a small diameter semicircular cross section at its tip, and a semicircular recess 4e is formed on the surface of the pinion seat 4 on the opposite side to the projecting direction.

The sleeve 2b of the character wheel 2 is loosely fitted onto the support shaft 4c of the pinion seat 4 and is rotatable.
The engaging portion 4d at the tip engages with the recess 4e of the adjacent pinion seat 4, so that the pinion seats 4 are non-rotatably connected to each other.

By sequentially connecting adjacent pinion seats 4 in this manner, the character wheel 2, pinion seat 4, and pinion 3 are interconnected without using a total shaft and a positioning shaft. Therefore, the inclination of the pinion seat 4 with respect to the character wheel 2 is small, and the position of the pinion in the circumferential direction is also accurately determined.
The shift operation becomes smooth and the character wheels 2 are well aligned. Of course, the engaging portion 4d of the support shaft 4c of the pinion seat 4, into which the uppermost character wheel 2 is loosely fitted, engages with a fixed portion such as a chassis, since the pinion seat 4 does not exist above it. Further, there is no need to provide a recess 4e on the rear end side of the support shaft 4c into which the lowest character wheel 2 is loosely fitted.

In addition, by making the length L ₁ of the support shaft 4c somewhat longer than the length L ₂ of the sleeve 2 of the character wheel 2, a clearance is secured to absorb changes due to thermal expansion between the character wheel 2 and the sleeve 2b. ing. Also a certain length
Since the support shaft 4c of _L1 is successively connected to adjacent pinion seats 4, the spacing between the pinion seats is always maintained constant, so there is no need to adjust these spacings during assembly.

4 and 5 show second and third embodiments of the present invention.

In the second embodiment shown in FIG. 4, an engaging portion 4d provided at the tip of a support shaft 4c is shaped like a pin with a circular cross section, and an engagement piece protrudes from the outer periphery of the pinion seat 4 in the same direction as the support shaft 4c. 4f, and a recess 4g is provided on the back surface of the pinion seat, which is the base end of the engaging piece 4f. That is, the pin-shaped engaging portion 4d rotatably engages with the circular recess 4e on the back surface of the adjacent pinion seat 4, but the small-diameter engaging portion 4h provided at the tip of the engaging piece 4f
By engaging with the recess 4g of the adjacent pinion seat 4, both pinion seats 4 are connected to each other in a non-rotatable manner.

In the third embodiment shown in FIG. 5, the cross section of the engagement part 4d at the tip of the support shaft 4c is circular, and a key 4i is formed on a part of the outer periphery of the engagement part 4d. The recess 4e is provided with a keyway into which the key 4i engages. That is, the adjacent pinion seats 4 are unrotatably connected to each other by the engagement of the key 4i and the keyway.

In this way, also in the second and third embodiments, the character wheel 2, pinion 3, and pinion seat 4 are connected without using the total shaft and the positioning shaft, and the inclination of the pinion seat 4 with respect to the character wheel 2 can be suppressed. and the effect of determining the position of the pinion is the first
This is similar to the example.

〔effect〕

Since the present invention is as described above, it is possible to create a totalizer that has almost no inclination of the pinion seat with respect to the rotational axis, allows good alignment of the character wheel, smooth operation, and is easy to assemble. can.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the first embodiment of the present invention, and the second
The figures are a sectional view taken along the line A-A in Fig. 1, Fig. 3 is an exploded perspective view of essential parts of the first embodiment, Fig. 4 is an exploded perspective view of essential parts of the second embodiment of the present invention, and Fig. 5 is an exploded perspective view of essential parts of the second embodiment of the present invention. FIG. 6 is a front cross-sectional view of the conventional device, FIG. 7 is a side cross-sectional view of the conventional device, and FIG. 8 is an exploded perspective view of the principal portion of the conventional device. It is. 2... Character wheel, 2a... Internal teeth, 3... Pinion, 4... Pinion seat, 4c... Support shaft, 4e...
recess.

Claims (1)

[Scope of utility model registration request] In addition to installing multiple letter wheels in parallel so that they can rotate freely,
A plate-shaped pinion seat was arranged between the character wheels, and this pinion seat supported a pinion that engaged with internal teeth formed on the inner peripheral wall of the character wheel to sequentially shift adjacent character wheels. In the totalizer, a support shaft is provided protruding from the center of the pinion seat, a character wheel is rotatably loosely fitted onto the support shaft, and a recess is provided with the tip of the support shaft located at the center of the adjacent pinion seat. 1. A totalizing meter, characterized in that the character wheel, the pinion seat, and the pinion are connected to each other by engaging with the pinion seat and positioning the pinion seats with a positioning means of the pinion seat.