JP2591440Y2 - Vehicle braking device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle braking device for obtaining a smooth turning of a trailer towed by a tractor.

[0002]

2. Description of the Related Art Japanese Patent Application No. 4-108 filed by the present applicant.
In the vehicle braking device according to No. 659, independent eddy current speed reducers are connected to the left and right wheels of the non-driving shaft of the trailer via a transmission mechanism. However, applying a braking force to both the left and right wheels has a problem in that the vehicle lacks running stability during cornering.

As shown in FIG. 3, when the tractor A makes a left turn, the inertia force of the trailer B going straight ahead causes the rear wheels 7 of the tractor A to slide outward in the turning direction shown by arrow y. And hinders smooth turning of the tractor A.

[0004]

SUMMARY OF THE INVENTION In view of the above-described problems, the object of the present invention is to individually actuate the eddy current type reduction devices of the left and right non-driving wheels to assist the smooth turning of a trailer or the like.
An object of the present invention is to provide a vehicle braking device.

[0005]

In order to achieve the above-mentioned object, the structure of the present invention is provided with eddy current type reduction gears on left and right non-driving wheels of a trailer towed by a tractor, and the vehicle speed of the tractor exceeds a predetermined value. When the steering angle is equal to or larger than a predetermined value, the eddy current type speed reducer of the wheel inside the turning direction of the trailer is brought into a braking state.

Further, in the configuration of the present invention, eddy current type reduction gears are provided on the left and right non-driving wheels of the rear two-axle vehicle. The eddy current type speed reducer for a wheel is brought into a braking state.

[0007]

When the tractor is turning, only the eddy current speed reducer of the wheel inside the turning direction of the trailer is automatically operated in association with the operation of the steering wheel. As a result, the inertial force of the trailer trying to go straight is suppressed, and the tractor smoothly turns.

In the case of a rear two-axle vehicle, when the vehicle speed is equal to or more than a predetermined value and the steering angle is equal to or more than a predetermined value, the eddy current type speed reducer of the wheel outside the turning direction of the vehicle is brought into a braking state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
The front wheel 2 is steered through a steering mechanism 3 by a steering wheel, and the rear wheel 7 is driven by an engine. Signals from a steering angle sensor 5 disposed opposite the steering mechanism 3 and a vehicle speed sensor 8 for detecting the rotation speed of the output shaft 11 of the transmission are input to an electronic control unit 6. The electronic control unit 6 separately excites the electromagnetic switching valves 10 and 10a under predetermined conditions, and drives the eddy current type reduction gears 13 and 13a.

The eddy current type speed reducers 13 and 13a are disposed on left and right wheels 20 of a trailer B pulled by a tractor A. The left and right wheels 20 are independently supported on the vehicle body by shafts 19. Each axle 19 has an endless chain 18 and a reduction gear train 1.
Eddy current type reduction gears 13
a and linked to the rotating shaft 16 of FIG. The specific configuration of the transmission mechanism is disclosed in Japanese Patent Application No. 4-108657 and is not directly related to the gist of the present invention, and will not be described further.

As is well known, the eddy current type speed reducers 13, 13a are magnets which fixedly support a braking drum 15 connected to a rotating shaft 16 and a large number of permanent magnets 14 on the outer peripheral surface so that the polarities are alternately different in the circumferential direction. Support tube 14A and magnet support tube 14A
And actuators 12 and 12a which reciprocate in the axial direction.

When the electromagnetic switching valves 10 and 10a are excited,
The eddy current type speed reducers 13 and 13a are brought into a braking state. The pressurized fluid (air or the like) in the air tank 9 mounted on the tractor A is
For example, when the power is supplied to the left end chamber of the actuator 12 through the electromagnetic switching valve 10, the eddy current type speed reducer 13 is set to the non-braking state shown in the drawing. Conversely, when the pressurized fluid is supplied to the right end chamber of the actuator 12, the magnet support cylinder 14A
Is in a braking state protruding into the inside of the vehicle.

In the present invention, the vehicle speed is set to a predetermined value (for example, 5 km /
h) At the time of the above-mentioned turning traveling, one of the electromagnetic switching valves 10 and 10a is excited by the output of the electronic control unit 6 based on the signals of the steering angle sensor 5 and the vehicle speed sensor 8, and the eddy current type reduction gear 1
One of the brakes 3, 13a is in a braking state, whereby the straight-line force of the trailer B is suppressed, and a smooth turning travel is assisted. When the vehicle speed is lower than a predetermined value (for example, 5 km / h), the inertia force of the trailer B trying to go straight is small,
Since the influence on the rear wheel 7 of the tractor A is small, the eddy current type speed reducers 13 and 13a are kept in a non-braking state.

FIG. 2 is a flow chart showing a control program of the electronic control unit 6 comprising a microcomputer for obtaining the above-mentioned control. In FIG. 2, p11 to p20 represent steps of each control program. This control program is repeatedly executed at predetermined time intervals. The control program is p11
And the vehicle speed V is read from the vehicle speed sensor 8 at p12. At p13, it is determined whether or not the vehicle speed V is higher than a predetermined value Vo.

If the vehicle speed V is lower than the predetermined value Vo at p13, the process proceeds to p17. If the vehicle speed V is higher than the predetermined value Vo, the steering angle θ is read from the steering angle sensor 5 at p14. p1
At 5, it is determined whether the steering angle θ is larger than a predetermined value θo. p
If the rudder angle θ is smaller than the predetermined value θo at 15, the electromagnetic switching valves 10 and 10a are demagnetized at p17, and the routine proceeds to p20. p1
If the steering angle θ is larger than the predetermined value θo at 5, it is determined at p16 whether the steering direction is left.

If the steering direction is right at p16, the electromagnetic switching valve 10a is excited at p19, pressurized air is supplied to the left end chamber of the actuator 12a, the eddy current type speed reducer 13a is brought into a braking state, and the process ends at p20. I do. If the steering direction is left at p16, the electromagnetic switching valve 10 is excited at p18, pressurized air is supplied to the right end chamber of the actuator 12, the eddy current type speed reducer 13 is brought into a braking state, and the process ends at p20.

In the above embodiment, the case of a trailer has been described. However, the present invention can be applied to a rear two-axle vehicle. As shown in FIG. 4, after the drive wheel 7 and the non-drive wheel 7A are provided,
In the case of an axle vehicle, during turning, a lateral force opposite to the turning direction acts on the non-drive shaft around the center of gravity of the vehicle,
In order to cancel this force, the eddy current type speed reducer 13a is brought into a braking state, and a braking force is applied to the wheel 7A on the outer side in the turning direction of the non-drive shaft. As a result, the rear two-axle vehicle has an understeer-like steering characteristic, and the stability against turning is improved.

[0018]

According to the present invention, as described above, eddy current type reduction gears are provided on the left and right non-driven wheels of a trailer towed by a tractor, and when the vehicle speed of the tractor is more than a predetermined value and the steering angle is more than a predetermined value. Since the eddy current speed reducer of the wheel inside the turning direction of the trailer is brought into the braking state, the force of the trailer to go straight during turning is suppressed, and the jackknife phenomenon is prevented. Therefore, the tendency of the rear wheels of the tractor to be pushed outward in the turning direction is suppressed, and stable and smooth turning (turning) is obtained.

In the case of a rear two-axle vehicle, when the vehicle speed is equal to or more than a predetermined value and the steering angle is equal to or more than a predetermined value, the eddy current type speed reduction device for the non-driven rear wheels outside the turning direction of the vehicle is brought into a braking state. The same effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a vehicle braking device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a control program of the braking device.

FIG. 3 is a plan view for explaining a force acting on a trailer when the tractor turns.

FIG. 4 is a plan view showing a configuration of a vehicle braking device according to a second embodiment of the present invention.

[Explanation of symbols]

5: steering angle sensor 6: electronic control unit 8: vehicle speed sensor
10, 10a: Solenoid switching valve 12, 12a: Actuator 13, 13a: Eddy current type reduction gear 20: Trailer wheel

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B62D 12/02 B62D 53/00 H02K 49/02

Claims (2)

(57) [Scope of request for utility model registration] An eddy current reduction device is provided on left and right non-driven wheels of a trailer towed by a tractor, and when the vehicle speed of the tractor is a predetermined value or more and a steering angle is a predetermined value or more, wheels inside the turning direction of the trailer are provided. A braking device for a vehicle, wherein the eddy current type speed reducing device is placed in a braking state. 2. An eddy current type speed reducer is provided on the left and right non-driving wheels of a rear two-axle vehicle. A braking device for a vehicle, wherein the speed reducing device is brought into a braking state.