JPS6241914Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque transmission device suitable for transmitting rotation of a drive shaft to an axle in a vehicle for children.

Conventionally, in infant cars, etc., Fig. 1a,
A drive device using a lever crank mechanism shown in b is used. In the figure, reference numeral 1 indicates the chassis of an infant vehicle, 2 a shaft rotatably passed through the chassis 1 and connected to the rear wheel 15, 2a and 2b cranks formed by bending the shaft 2, and 3 The fixed shafts 4a and 4b provided on the chassis 1 are pedal links whose upper ends are rotatably connected to the fixed shaft 3,
Step portions 4c, 4d are formed at the lower end, and the length of the step link is longer than the link length of the cranks 2a, 2b. 5a and 5b are the tread portions 4c and 4d and the top portions 2c of the cranks 2a and 2b,
2d are connecting rods that are axially connected to each other.

The drive device using the lever crank mechanism having the above configuration rotates the cranks 2a and 2b by alternately swinging the foot portions 4c and 4d of the foot links 4a and 4b, which are levers, along the broken line A. Can be done.

However, as is well known, in the rotation of the cranks 2a and 2b, there is a point at which the cranks 2a and 2b can rotate in any left or right direction at the positions of points B and C shown by imaginary lines. In this type of children's vehicle, even if the pedals 4c and 4d are stepped on, the desired direction of travel, that is, the forward and backward directions, cannot necessarily be selected at the beginning of the rocking of the link 4. This requires a certain amount of pedal force and timing, and has the disadvantage that children with underdeveloped motor skills cannot smoothly rotate the axle.

In order to solve this problem, it has been proposed to use chain connection means, but this lacks safety as there is a risk that children's fingers etc. may be drawn into the connection part, and as a countermeasure, the drive part is covered. A chain cover was required, making the structure larger and more complex, increasing the number of parts, and increasing the cost of the product.

In view of the above points, the present invention includes a pair of shafts having crank portions of at least three equal lengths protruding from each other at different circumferential angles in a plane perpendicular to the shaft, and cranks facing each other between these two shafts. The axle is connected to one of the above pair of shafts, and a crank with a tread is connected to the other, and the axle is connected to the above axle in conjunction with the rotation of the crank. An object of the present invention is to provide a torque transmission device for a vehicle for infants that eliminates the above-mentioned conventional drawbacks by rotating the torque transmitting device.

The invention will now be described with reference to illustrated embodiments.
Figures 2 to 4 show the chassis and torque transmission device of an infant scooter. In the figures, 6 is a chassis, with a support plate 7 erected at the front and both ends facing downward at the rear. A support rod 8 is fixedly bent. Reference numeral 9 denotes a front shaft rotatably supported on the upper part of the support plate 7, and in the axial direction there are crank portions 9a, 9b, 9a and 9b whose circumferential direction angle D is offset to 90 degrees.
9c is formed by bending, and each top E, F,
The lengths from G to the axis are set equal. Reference numeral 10 denotes a rear shaft rotatably supported by the lower bent portion of the support rod 8, which has approximately the same shape as the front shaft 9, and has crank portions 10a, 10b, 1
The tops E', F', and G' of the front shaft 9 and the tops E, F, and G of the front shaft 9 are connected to connecting rods 11a and 11a, which are formed to have the same length, through a connecting member 12 shown in FIG. 11b,
They are each axially connected by 11c. A crank 14 having pedals 13 is connected to both ends of the front shaft 9, and an axle 15a of a rear wheel 15 (FIG. 2b) is connected to both ends of the rear shaft 10.

Since it has the above configuration, the torque transmission device of the present embodiment prevents the generation of a consideration point on the rear shaft 10 by using the crank portions 10a, 10b, 10 at different angles.
c, the rotation of the crank 14 is prevented by the front shaft 9,
The rotational motion can be transmitted to the rear wheel 15 via the connecting rods 11a, 11b, 11c and the rear shaft 10.

However, in the torque transmission device of this embodiment, as can be understood from the crank angle setting described above, the crank parts 9a, 10a and 9c, 10c enter the consideration point at the same time. Crank parts 9b and 10b located in the right angle direction
occupies the maximum moment position in the traction or pressing force and promotes continuous rotation of each crank part, so that smooth rotation of the device can be obtained. 10c, each connecting rod 11a, 11
Since the forces acting on c act in opposite directions to each other with respect to the extending direction of each of these connecting rods, creating a couple relationship, it is possible to reduce the pulsation of the shaft, which normally occurs due to the presence of a consideration point.

Incidentally, if the connecting rod is made into a tie rod as shown in Fig. 6, the axial length of the connecting rod can be finely adjusted, and the fastening member 20 is fixed with the locking screw 21 after adjustment, the assembly work will be made easier. Instead, it is possible to maintain accurate distances between the front and rear cranks.

As described above, according to the present invention, the rotation of the front axle that is linked to the pedals is transmitted as rotation to the rear axle that is connected to the axle via the link mechanism, allowing for smooth and safe rotation. A torque transmission device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a simplified explanatory diagram of a drive device using a conventional lever crank mechanism, FIGS. 2 to 4 are diagrams each showing an embodiment of the present invention, and FIG. FIG. 6 is a perspective view showing a connecting portion between the crank portion and the connecting rod, and FIG. 6 is a perspective view showing an example of the connecting rod. 6... Seat, 9... Front axle, 9a, 9b, 9
c, 10a, 10b, 10c... crank part, 1
0...Rear shaft, 11a, 11b, 11c...Connecting rod, 13...Pedal, 14...Crank, 15...
…Rear wheel.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of shafts having at least three crank portions of equal length protruding from each other at different circumferential angles in a plane perpendicular to the shaft, and a pair of shafts facing each other between the two shafts. It is equipped with a connecting rod of the same length that connects the tops of each crank, an axle is connected to one of the pair of shafts, and a crank with a tread is connected to the other, and the shaft is linked to the rotation of this crank. A torque transmission device for an infant vehicle, characterized in that the axle is rotated. (2) The torque transmission device for a vehicle for infants according to claim 1, wherein the connecting rod is a tie rod.