JPH0748315Y2 - Power transmission structure for four-wheel drive vehicle toys - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a vehicle toy such as an automobile toy such as an automobile toy, and particularly to a four-wheel vehicle that transmits driving force to four wheels in front of and behind the vehicle body. The present invention relates to a power transmission structure for a drive-type vehicle toy.

[Conventional technology]

In vehicle toys such as race car toys with running wheels,
There is a so-called four-wheel drive type that drives the driving force to all the front and rear wheels to improve vehicle speed, running performance, and running stability.

FIG. 2 shows an example of a four-wheel drive type racing car toy that competes for speed by running on a racing course with a wall. In the front and rear parts of a box-shaped body frame 1, front wheels are provided at both ends.
A front axle 4 and a rear axle 5 in which 2, 2 and rear wheels 3, 3 are integrally rotatably mounted are provided so as to penetrate in the width direction of the vehicle body.

A motor 6 and a transmission shaft 7 are arranged in the vehicle body frame 1, a battery chamber 9 for accommodating a battery 8 is defined, and a guide frame 10 projecting forward and on both sides of the vehicle body frame 1 is formed. Rolling wheels 12 are provided at both end portions of 11, 11, 11 to guide the traveling by contacting with side walls of a racing course with a wall (not shown).
Are each pivoted.

The motor 6 and the rear axle 5 are connected by a speed reducer 13 formed of a plurality of gears, and the pinion 14, the pinion 14, and the transmission shaft 7 that penetrates in one side of the battery chamber 9 in the vehicle front-rear direction. 15 is pivotally mounted, and the axles 4 and 5 are also pivotally mounted with crown gears 16 and 17 meshing with the pinions 14 and 15, respectively. The motor 6 is transmitted to the rear axle 5 via the reduction gear 13. Is transmitted to the front axle 4 via the transmission shaft 7, and simultaneously drives the rear wheels 4 and 4 and the front wheels 3 and 3 to rotate.

[Problems to be solved by the device]

However, when the above-mentioned car toy travels in a curve, there is no difference in rotation between the inner wheel and the outer wheel that are axially attached to the axle, so either the inner or outer traveling wheel slips, and this idling becomes running resistance, The curve cannot be smoothly turned, and the speed of the straight line is significantly reduced.

The present invention has been made against the background of such circumstances.
The purpose of the present invention is to provide a power transmission structure of a four-wheel drive type vehicle toy in which the two inner and outer wheels have a differential action during curved traveling by two differential gear devices to enable high speed curved traveling. I am trying.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention axially attaches traveling wheels to a pair of axles pivotally supported at the front and rear portions of a vehicle body, and applies a driving force from one motor to each axle,
In a four-wheel drive vehicle toy that travels on a racing course guided by rolling wheels, one of the axles is used as a drive-side axle and the other is used as a driven-side axle, and these axles are divided into both sides of the vehicle body. Then, each of the two dividing shafts is formed, and the differential gear device for transmitting the driving force of the motor is interposed between the dividing shafts of the driving side axle. The transmission shaft is arranged in the front-rear direction of the vehicle body, and the split shaft and the transmission shaft are connected via a gear.

[Action]

The driving force of the driving source is transmitted from the differential gear device to the driving side axle, and further, from each split shaft of the driving side axle,
The traveling wheels are transmitted to the split axle of the driven side axle via the transmission shaft, and the traveling wheels pivotally attached to these split shafts are rotationally driven.

The driving force described above causes the traveling wheels to rotate at the same speed in the case of straight traveling. In the case of curved traveling, a differential gear that receives resistance from the traveling wheels causes a speed difference between the split shaft inside and outside the drive-side axle, and also through the transmission shaft to the split shaft of the driven-side axle. , The traveling wheels of the outer dividing shaft are rotated at high speed and the traveling wheels of the inner dividing shaft are rotated at low speed without slipping.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

A four-wheel drive racing car toy 20 that travels on a racing course with a wall is a box-shaped body frame 23 having a motor 21 and a battery compartment 22 inside, and at the front and rear of the box, a rear axle serving as a drive side axle of the present invention. An axle 24 and a front axle 25 serving as a driven side axle are pivotally mounted, and the guide frame and the rolling wheels shown in the above-mentioned conventional example are mounted on the vehicle body frame 23.
It is provided on a body (not shown) attached to the.

A differential gear device 26 disposed in the rear portion of the motor 21 is interposed in the rear axle 24, and a pair of transmission shafts 27, 27 is provided between the axles 24, 25 on both sides of the vehicle body frame 23. The driving force of the motor 21 transmitted to the rear axle 24 via the transmission shafts 27, 27,
Reported to front axle 25.

The axles 24 and 25 are divided shafts 24a and 24
a, 25a, 25a, split shaft 24 of rear axle 24
a and 24a are pivotally supported by bearing brackets 23a and 23a, which are erected on the side walls of the vehicle body frame 23, with the differential gear device 26 interposed therebetween, and the split shaft 25a of the front axle 25,
25a is pivotally supported by support shafts 23b, 23b protruding from the side wall of the vehicle body frame 23.

Further, each split shaft 24a of the rear axle 24 has a bevel gear 29 together with a rear wheel 28 at the outer end, and a front axle.
A bevel gear 31 is axially attached to each of the divided shafts 25a of 25 together with the front end wheel 30 at the outer end.

The differential gear device 26 provided on the rear axle 24 receives the driving force of the motor 21 transmitted to the split shafts 24a, 24a at the same speed during normal straight traveling, and receives resistance from the ground contact surface such as curved traveling. In this case, the differential gear device 26 of the present embodiment performs differential action so as to transmit at different speeds. The differential gear device 26 of the present embodiment includes a ring gear 33 that meshes with the pinion 32 of the motor 21 and inner ends of the split shafts 24a, 24a. A rotatably holding cylindrical bearing 34, a pair of differential pinion gears 35, 35 pivotally supported by a support shaft 34a of the bearing 34, and side gears 36, 36 axially attached to the dividing shafts 24a, 24a. Composed of.

The differential pinion gears 35 are provided such that the support shaft 34a of the bearing 34 is fitted to the ring gear 33 so as to be rotatable integrally with the ring gear 33, and the side gears 36, 36 are both differential pinion gears 35, 35, respectively. Is provided in mesh with.

Each of the transmission shafts 27 is pivotally supported by bearing brackets 23c, 23c projecting from the side wall of the frame 23, and bevel gears 37, 38 pivotally attached to the ends are provided so as to mesh with the above-mentioned bevel gears 29, 31.

The driving force transmitted from the pinion 32 of the motor 21 to the ring gear 33 branches the differential pinion gears 35, 35 that rotate integrally with the ring gear 33, and from the respective side gears 36, 36,
Enter the respective dividing shafts 24a, 24a of the rear axle 24, and further from the bevel gears 29, 37 through the transmission shaft 27, the bevel gears 38, 31.
Thus, the split shafts 25a, 25a of the front axle 25 are transmitted to drive the rear wheels 28, 28 and the front wheels 30, 30.

Next, the operation of this embodiment configured as described above will be described.

When the racing course is straight, the driving force of the racing car toy 20 is from the differential gear unit 26 to the rear axle 24.
The split shafts 24a and 24a of the front axle 25 are further transmitted at the same speed to the split shafts 25a and 25a of the front axle 25 through the respective transmission shafts 27, and the rear wheels 28 and 28 and the front wheels 30 and 30 are rotated with the same rotational force. To drive.

Next, when the racing course is curved, the rear wheels
Due to the differential gear device 26 receiving different resistances from the respective 28, 28, the outer dividing shaft 24a having a small resistance from the ground surface is rotated at an increased speed, and the inner dividing shaft 24a having a large resistance is rotated at a reduced speed.

The rotation of the split shafts 24a, 24a is performed by the transmission shafts 27 through the split shafts 25a on the same side of the front axle 25.
The front and rear wheels 28 and 30 on the inner side are driven with high rotational force, and the front and rear wheels 28 and 30 on the outer side are driven with low rotational force.

Therefore, the inner and outer rear wheels 28, 28 and the front wheels 30, 30 are smoothly driven to rotate without slipping even on the curvature of the racing course, so that the speed at the time of straight line is hardly reduced,
Can perform high-speed curved driving.

Further, by interposing one differential gear device 26 on the rear axle 24, a differential action is exerted on all of the rear wheels 28, 28 and the front wheels 30, 30. It has the same function as the built-in structure, but the structure is simple and there are few failures.

Further, since the front axle 25 does not penetrate the vehicle body frame 23, the length of the vehicle body frame 23 can be kept short and the vehicle body can be made compact.

Incidentally, the differential gear device of the present invention may be provided on the front axle contrary to the above embodiment, and may be transmitted to each divided shaft of the rear axle by the transmission shaft.

[Effect of device]

As described above, the power transmission structure of the four-wheel drive type vehicle toy that travels on the racing course guided by the rolling wheels according to the present invention has one of the front and rear axles as the drive side axle and the other as the other. It is not a driven side axle, and these axles are divided into both sides of the vehicle body to form two dividing shafts, respectively, and the driving force of one motor is transmitted between the dividing shafts of the driving side axle. A dynamic gear device is installed, and between both split shafts on the same side of the vehicle body,
Since the transmission shafts are arranged in the front-rear direction of the vehicle body and both the divided shafts and the transmission shafts are connected via gears, the running wheels axially attached to each divided shaft control the rotation speed of one motor. Only by doing so, you can smoothly run at high speed on the curved course of the racing course without slipping.

Further, since only one complicated differential gear device is required, the structure is simple and there are few failures, and the structure is suitable as a power transmission structure for a toy vehicle that requires a simple structure.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a chassis of a racing automobile toy showing an embodiment of the present invention, and FIG. 2 is a plan view of a chassis of a conventional racing automobile toy. 20 …… Racing car toy, 21 …… Motor, 23 …… Box-shaped body frame, 24 …… Rear axle that becomes the driving side axle, 25 …… Front axle that becomes the driven side axle,
24a, 25a …… Split shaft, 26 …… Differential gear unit, 27…
… Transmission shaft, 28 …… rear wheel, 29,31,37,38 …… bevel gear, 3
0 …… front wheel

Claims (1)

[Scope of utility model registration request] Claims: 1. A pair of axles pivotally supported at the front and rear of the vehicle body are respectively provided with traveling wheels, and a driving force is applied from each motor to each axle to guide a racing course by rolling wheels. In a four-wheel drive type vehicle toy that runs by driving, one of the axles is used as a drive side axle,
The other is formed as a driven side axle, and these axles are divided into both side portions of the vehicle body to form two dividing shafts, respectively, and a difference in which the driving force of the motor is transmitted between the dividing shafts of the driving side axle. A dynamic gear device is interposed, and further, a transmission shaft is arranged in the front-rear direction of the vehicle body between both split shafts on the same side of the vehicle body, and both split shafts and the transmission shaft are connected via gears. Power transmission structure for a four-wheel drive vehicle toy.