JPH0416714Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a gear in a mainspring unit, which is characterized in that the gear shaft of at least one gear constituting a gear mechanism is formed integrally with the chassis in advance. Regarding the mounting structure.

(Prior art and its problems) Conventionally, as a two-wheeled traveling toy that utilizes a gear support structure in this type of spring unit, a spring unit 52 is installed on one side wall 51 of a chassis 50 as shown in FIG. The driving force from
Spur gears 53a, 53 pivotally supported by this side wall 51
There is a configuration in which the signal is transmitted to a spur gear 54a mounted on the axle of the rear wheel 54 via gears b and 53c. However, each of the above-mentioned spur gears has a structure that is integral with the rotating shaft, and the rotating shafts 53,
53, 53 are rotatably supported, when assembling the spur gears 53a, 53b, 53c to the chassis 50, the spur gears 53a, 53
The rotating shafts 53, 53, 53 of b, 53c are connected to the bearing part 5.
3a, 53b, and 53c, and it is not easy to fit and fix them, the workability is extremely poor, and the manufacturing cost is also high.Therefore, a solution to this problem has been desired.

(Problems to be solved by the invention) The present invention has been made in view of the above-mentioned points of view, and in particular, it enables easy assembly of spur gears, improves workability, and improves strength. The purpose of this study is to propose a gear support structure for a mainspring unit that is also excellent.

(Technical means to solve the problem) As a technical means to solve the above problem,
The gear support structure of the mainspring unit according to the present invention includes a mainspring, a gear mechanism, and an axle of a driving wheel in a vehicle chassis, and is arranged such that the output shaft of the mainspring is linked to the axle via the gear mechanism. The mainspring unit is characterized in that at least one gear constituting the gear mechanism is supported as described below.

(a) A gear shaft is integrally protruded from the inner wall surface of the chassis. (b) The tip of the gear shaft has a V-shaped notch groove in the center, and a conical groove on the outer periphery of the notch groove. (c) The notch grooves are formed to have a depth approximately equal to the height of the bulges (d) The gear shaft constitutes a gear mechanism. At least one gear is rotatably inserted (effects and effects of the invention) As described above, the gear support structure in the mainspring unit according to the invention is such that the gear shaft is divided into two separable members in advance. Since the spur gear is integrally formed on the inner wall surface of the vehicle chassis formed in this manner, and only the spur gear is rotatably inserted into the gear shaft during assembly, the assembly work is simplified. In addition to improving productivity, the gear shaft also has high strength.

Furthermore, when inserting and fitting the gear into the gear shaft, the V-shaped notch groove at the tip of the gear shaft narrows and the bulging part contracts inward to fit the gear, and when the bulging part passes through, the bulging part closes. Since it returns to its original shape, the bulge prevents the gear from coming off after the gear has been inserted.

Furthermore, since the V-shaped notch groove only needs to be formed in the bulge at the tip of the gear shaft, it is easier to form and is less expensive than forming a vertically long slit groove in the center of the gear shaft. Costs can be realized.

Moreover, in a structure in which a vertically elongated slit groove is formed on the gear shaft, the slit groove widens or narrows due to changes in the load applied by other gears in mesh with each other in the spring gear mechanism. The center of the shaft is likely to change, which may result in poor meshing with other gears. However, since the V-shaped notch groove of the present invention is formed only at the tip of the gear shaft, the gear shaft does not bend easily even if the load applied by other gears changes, and the center of the gear Hard to change. Therefore, good meshing with other gears can be maintained.

(Example) Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral A indicates a two-wheeled toy to which the gear attachment structure in the spring unit according to the present invention is applied. As shown in FIGS. 1 and 2, this two-wheeled toy A includes a chassis 1, a steering shaft 2 supported by a handle support portion 11 protruding from the front of the chassis 1, and a steering shaft 2 supported by a handle support portion 11 projecting from the front of the chassis 1. A handle 3 fixed to the upper end of the adaxial shaft 2, a front wheel 4 rotatably supported at the lower end, and a rear wheel 5 rotatably supported by a support hole 6 provided at the lower rear of the chassis 1. It is composed of. And this rear wheel 5 is the 10th
Axle 5 protruding left and right from the axis as shown in the figure
Pinions 5a and 5b are attached to pinions c and 5c.

The chassis 1 above is a case member 1 that can be divided into left and right parts.
a and 1b, and in its hollow interior, as shown in FIGS. It has two transmission gear mechanisms 30 and 40 for this purpose.
In addition, fitting protrusions 7, 7a are provided at the lower front and upper rear portions of one case member 1a of the joint surfaces of the case members 1a, 1b, and fitting recesses 8, 7a are provided at corresponding positions of the other case member 1b. 8a is formed.
This allows the case members 1a and 1b to be reliably connected.

As shown in FIG. 5a, the mainspring unit 20 is formed of a mainspring box 21 and a mainspring 22 housed within the mainspring box 21. As shown in FIG. 8, the spring box 21 has a locking hook 2 that engages with a locking hook 9a protruding from the side wall 9 of the case member 1a.
1a, and by engaging these stop hooks 9a and 21a, the spring box 21 can be attached to the case member 1a. Also,
Side wall 9 of case member 1a and spring box 21
By providing spacers 10, 10a at the sides, the spring box 21 is positioned at the center of the vehicle chassis 1. Reference numeral 21b indicates a support hole for a bearing provided at a position protruding in the outer radial direction of the peripheral edge of the spring box 21.

As shown in FIGS. 4 and 5, the first gear mechanism 30 is connected to a short shaft 31a by a hole 12 drilled in the case member 1a and a hole 13 bored in the case member 1b.
and a first output gear 31 which is rotatably and removably supported on a long shaft 31b, and the case member 1.
The first intermediate gear 32 is rotatably and irremovably supported by a first intermediate gear 32 that is removably supported by the hole 12a of the case member 1a, and a gear shaft 14 that projects from the side wall of the case member 1a. and a first final gear 33 that meshes with one pinion 5a of the rear wheel 5. And each of the gears 31, 32, 33
consists of sequentially meshed spur gears, and transmits the driving force from the mainspring unit 20 to the rear wheel 5 via the final gear 33.

As shown in FIG. 3b, the gear shaft 14 integrally protruding from the inner wall of the case member 1a has a V-shaped notch groove 14a formed in the center at the tip thereof. A truncated conical bulge 14b is formed on the outer periphery. The cutout groove 14a is formed to have a depth substantially equal to the height of the bulge 14b. Then, the final gear 33 is connected to this gear shaft 1.
4, use the bearing hole 33 of this final gear 33.
a should be inserted into the gear shaft 14. At this time,
At the tip of the gear shaft 14, the notch groove 14a narrows and the bulge 14b contracts inward, making it easy to attach.
Since the gear 33 returns elastically, the gear 33 will not come off.

Next, as shown in FIGS. 5a and 5b, the second gear mechanism 40 has an axial hole inserted through the long axis 31b of the first output gear 31, and two locking protrusions protruding from the center. A second output gear 41 that is fixed to the first output gear 31 by fitting the second output gear 41a into two recesses 31c formed on the long axis side surface of the first output gear 31, and a mainspring. A second intermediate gear 42 has a rotating shaft 42a rotatably supported by the support hole 21b of the box 21 and the hole 15 of the case 1b, and has a small gear 42b that meshes with the second output gear 41; A second final gear 43 is rotatably supported by a gear shaft 16 protruding from the side wall of 1b and cannot be pulled out.
It is composed of. This second final gear 43 meshes with the rear wheel pinion 5b. In addition, two locking protrusions 41a of the second output gear 41
The inner end of the mainspring 22 is locked between them, and when the rear wheel 5 is reversely rotated backward, the first and second transmission gear mechanisms 30, 40 (the final gear 33,
43, intermediate gears 32, 42, output gears 31, 4
1), the mainspring 22 is wound to store driving energy, and when the load on the rear wheel is removed, each gear is rotated by the unwinding force of the mainspring to move the rear wheel 5 in the forward direction. configured to drive. 18, 18a are case members 1a
Engagement recesses provided at the rear of the upper surface and at the center of the lower surface are shown, and locking pieces 19, 19a corresponding to the engagement recesses 18, 18a are integrally formed on the opening surface of the case member 1b.

The gear shaft 16 and the gear 43 are connected to the gear shaft 14
and gear 33, and are similarly constructed and attached.

In the above embodiment, only the gear shaft of the final gear is formed integrally with the inner wall of the vehicle chassis, but the present invention is not limited to this, and it is also possible to apply a similar configuration to other gears, for example.

According to the gear support structure in the mainspring unit as described above, the two transmission gear mechanisms 30, 40
The gear shafts 14 and 16 of at least one of the gears 33 and 43 constituting the are integrally formed on the inner wall surface of the divisible case members 1a and 1b,
Since it is rotatably attached to the gear shafts 14 and 16, this attachment work is simplified and efficiency is improved. Also, when inserting the gears 33, 43 into the gear shafts 14, 16,
The V-shaped notch groove 14a at the tip of the bulging portion 14 is narrowed, and the bulging portion 14b is contracted and fitted inward.
When b passes through, the bulging portion 14b returns to its original shape, so that the bulging portion 14b can prevent the gears 33, 43 from coming off after the gears 33, 43 are inserted.

Furthermore, since the notched groove 14a is formed in a V-shape at the tips of the gear shafts 14 and 16, it is necessary to form a vertically long slit groove on the gear shaft (for example, see Japanese Utility Model Publication No. 54-22813). ), it is easier to mold, so lower costs can be achieved.

Moreover, in the case of a structure in which a vertically elongated slit groove is formed on the gear shaft, the slit groove widens or narrows due to changes in the load applied by other gears in mesh with each other in the spring gear mechanism. The axis center of the gear tends to change easily, and there is a risk that the meshing state with other gears will be poor. However, the V-shaped notch groove 14a is
Since the gear shafts 14 and 16 are formed only at the tips of the gears 33 and 43, the gear shafts 14 and 16 do not easily bend even if the load applied by other gears changes.
The center of is difficult to change. Therefore, good meshing with other gears can be maintained.

[Brief explanation of drawings]

Fig. 1 is a front view of a two-wheeled toy to which the gear support structure of the spring unit according to the present invention is applied, Fig. 2 is a perspective view of the chassis, and Fig. 3a shows the spring unit assembled to one case member. Fig. 4 is an explanatory view of each case member viewed from the opening side, Fig. 5 is a perspective view of the mainspring unit, and Fig. 5 shows the first and second transmission gear mechanisms in the mainspring unit. Fig. 6 and Fig. 7 a and b are explanatory diagrams of the structure of the spring box and the first output gear, and Fig. 8 is a diagram showing the structure of the spring box and the case member. FIG. 9 and FIG. 10 are explanatory views showing the structure of the second output gear and the rear wheel, and FIG. 11 is an explanatory view of the structure of a conventional two-wheeled toy. Code, A... Two-wheeled toy, 1... Chassis, 1
a, 1b...Case member, 14...Gear shaft, 14
a...Notch groove, 14b...Bulge, 20...Spring unit, 21...Spring box, 22
...Spring, 31...First output gear, 32...
...First intermediate gear, 33...Final gear, 41...
Second output gear, 42... Second intermediate gear, 43
...The second final gear.

Claims (1)

[Scope of Claim for Utility Model Registration] A mainspring unit comprising a mainspring, a gear mechanism, and an axle for a drive wheel in a vehicle chassis, and arranged such that the output shaft of the mainspring is linked to the axle via the gear mechanism, A gear support structure in a mainspring unit, characterized in that it supports at least one gear constituting the gear mechanism as described below. (a) A gear shaft is integrally protruded from the inner wall surface of the chassis. (b) The tip of the gear shaft has a V-shaped notch groove in the center, and a conical groove on the outer periphery of the notch groove. (c) The notch grooves are formed to have a depth approximately equal to the height of the bulges (d) The gear shaft constitutes a gear mechanism. At least one gear is rotatably inserted.