JPH05284725A - Device for braking vehicle - Google Patents

Abstract

PURPOSE:To lighten the burden in braking of a vehicle only by incorporating this device into a nondriven axle without needing a power supply cable or a hydraulic pipe and enable it to decelerate on a downward slope. CONSTITUTION:An axle 3, which supports right and left each wheel 27, is divided. Each axle 3 and a pair or rotary shafts 14 arranged outside an axle case 2 are coupled with each other by a transmitting mechanism C. Each rotary shaft 14 is equipped with an eddy current type reduction gear A, and braking force is exerted independently on the right and left wheels 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses an eddy current type speed reducer for assisting a friction brake of a vehicle to independently apply a braking force to the left and right wheels of the vehicle to ensure a safe running downhill. It relates to the device.

[0002]

2. Description of the Related Art As is well known, a retarder is designed to prevent an acceleration force applied to a vehicle when the vehicle travels on a long downhill.
Stable deceleration braking is continuously applied to prevent the friction brake from burning. The eddy current type speed reducer as a retarder is generally attached to a propulsion shaft or the like that interlocks with wheels, but no example is found to be attached to a non-drive axle (dead shaft) of a trailer.

If a retarder is attached to a non-driving axle of a trailer, power consumption is large in the case of an electromagnetic retarder, and a power supply line from the power source of the tractor to the trailer is required. Connection from hydraulic source to trailer requires a lot of time to connect hydraulic piping and bleed air, and when disconnecting the trailer, the power supply line and hydraulic piping must also be disconnected. Further, it is necessary to attach a power transmission mechanism such as a differential mechanism and a propulsion shaft to the non-driving axle, but it is difficult to provide the power transmission mechanism due to the restriction of the underfloor space as a trailer.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the object of the present invention is to reduce the braking load on the vehicle and to keep the vehicle downhill by simply installing it in a non-driving axle without the need for a power supply line or hydraulic piping. (EN) Provided is a braking device for a vehicle capable of decelerating.

[0005]

In order to achieve the above-mentioned object, the structure of the present invention has a pair of rotating shafts, which are formed by dividing an axle supporting left and right wheels, and are arranged outside each axle and the axle case. And are separately interlocked by a transmission mechanism, each rotating shaft is provided with an eddy current type speed reducer, and braking force is independently applied to the left and right wheels.

[0006]

In the present invention, the non-driving axle is divided into left and right parts, and each axle is operatively connected to a rotary shaft parallel to the axle by a transmission mechanism such as a chain or gear. The rotating shaft is supported by an axle case, and the rotating shaft is provided with an eddy current type speed reducer. In other words, while a braking body consisting of a braking drum or a disc is connected to the rotating shaft, a large number of magnets (here, permanent magnets) facing the braking body are equally spaced in the circumferential direction on a fixed frame connected to the axle case. To support the magnet support wheel.

The magnet supporting wheel is moved or rotated in the axial direction,
The magnet forms a short-circuit magnetic circuit inside the fixed frame, and switches between a non-braking position where the magnetic field is not applied to the braking body and a braking position where the magnet applies the magnetic field to the braking body.

[0008]

1 is a front sectional view of a braking device for a vehicle equipped with an eddy current type speed reducer A according to the present invention. The inner end of the axle 3 has a bearing 4 inside the axle case 2 divided into left and right separately.
And the flange 3a at the outer end of the axle 3 is supported by the hub 3
It is connected to the two ends by bolts. Hub 32 is bearing 3
1, 33 support the outside of the axle case 2. A wheel disk 29 supporting a pair of wheels 27 is fixed to a bolt 30 on the outside of a flange integral with the hub 32.

According to the present invention, the gear box 16 of the transmission mechanism C is supported so as to surround the axle case 2. That is,
The gear box 16 having a rectangular cross section has a cylindrical portion 16b provided on the left end wall 16a fitted on the axle case 2 and fixed by an appropriate means. The right end of the gear box 16 is a flange 16
and a flange 16c of a gear box 16 fixed to the axle case 2 on the right side, which is formed with c, and is connected by a bolt. The hub 17 parallel to the axle 3 and the intermediate shaft 12 are fixed to the end wall 16a of the gear box 16. The rotating shaft 14 is supported by the hub 17 by the bearings 26 and 26a, and the boss 9 integral with the chain wheel 8 is supported by the intermediate shaft 12.

The transmission mechanism C for interlockingly connecting the rotating shaft 14 and the axle 3 is a chain wheel 6 spline-fitted to the inner end of the axle 3 and fastened by a nut 5, and a chain wheel 8 supported by the intermediate shaft 12. A chain 7 is spanned between and, and a gear 10 integral with the boss 9 is meshed with a gear 13 integral with the rotary shaft 14.

A mounting flange 25 is spline-fitted to the rotary shaft 14 and fastened to the nut 24. The end wall of the braking drum 21 or the spokes 22 are connected to the mounting flange 25 by bolts 23. The annular fixed frame 19 arranged inside the braking drum 21 is supported by the spokes 18 that project from the hub 17 in the radial direction. The fixed frame 19 supports a magnet support wheel 47 that supports the magnet 20 therein by an air pressure actuator B so as to be axially slidable between a braking position and a non-braking position.

As shown in FIG. 2, the fixed frame 19 has an annular frame portion 19a made of a non-magnetic material and having an inverted L-shaped cross section, an annular frame portion 19b made of a magnetic material and having an inverted L-shaped cross section, and an inner cylinder 19.
By combining with c, an inner space having a rectangular cross section is formed. A large number of openings are formed in the cylindrical portion of the frame portion 19a of the fixed frame 19 at equal intervals in the circumferential direction, and the ferromagnetic plate 42 is fitted and fixed in the openings. Actually, the ferromagnetic plate 42 is cast when casting the frame portion 19a. The magnet support ring 47 slidably fitted onto the inner cylinder 19c of the fixed frame has a large number of magnets 20 facing the respective ferromagnetic plates 42 coupled to the outer peripheral wall. Three actuators B are preferably connected to the right end wall of the fixed frame 19. The actuator B has a piston 43 fitted in a cylinder 44, and a rod 46 protruding from the piston 43 into the fixed frame 19 is connected to a magnet support wheel 47.

Next, the operation of the vehicle braking system according to the present invention will be described. When the vehicle is traveling, the rotation of the wheels 27 is transmitted to the rotary shaft 14 via the hub 32, the axle 3, and the transmission mechanism C, and the braking drum 21 is constantly rotated. During non-braking, the magnet support wheels 47 of the eddy current type speed reducer A are retracted to the positions shown by the chain lines in FIG. 2, and a large number of magnetic poles are arranged so that the magnetic poles with respect to the braking drum 21 are alternately arranged in the circumferential direction. The magnet 20 exerts a magnetic field on the peripheral wall portion of the frame portion 19a made of a magnetic material. However, since a short-circuit magnetic circuit is formed between the frame portion 19b and the magnet support wheel 47 made of a magnetic material, and the magnet 20 does not exert a magnetic field on the braking drum 21, the braking drum 21 receives no braking torque.

When pressurized air is supplied to the right end chamber of the actuator B during braking, the magnet support wheel 47 is pushed to the left by the piston 43 as shown in the figure, and the magnet 20 causes the ferromagnetic plate 42 to move.
A magnetic field is applied to the braking drum 21 via When the rotating braking drum 21 crosses the magnetic field from each magnet 20, an eddy current flows inside the braking drum 21, and the braking drum 21 receives a braking torque.

The braking torque exerted by the eddy current type speed reducer A on the wheels 27 is substantially proportional to the rotation speed of the braking drum 21.
Therefore, if the gear ratio of the transmission mechanism C is set in advance in relation to the load capacity of the vehicle and the slope of the traveling downhill, a stable braking force is continuously applied to the wheels 27 when traveling downhill. Can be given.

Since the left and right wheels 27 are individually provided with the eddy current type speed reducer A, it is reasonably possible to continuously apply the braking force to the wheels 27 by the eddy current type speed reducer A on a curved downhill. There is no danger of the car body spinning and it is safe.

In the above embodiment, the eddy current type speed reducer of the type in which braking and non-braking are switched by projecting the magnet supporting wheel into the braking drum or retracting it from the braking drum has been described. However, the present invention is not limited to this, and for example, the magnet supporting wheel which is always disposed inside the braking drum is rotated by half of the magnet arrangement pitch during non-braking to short-circuit the inside of the fixed frame. A magnetic circuit is formed to prevent the magnetic field from being applied to the braking drum.Furthermore, a braking disc that replaces the braking drum is connected to the rotating shaft, and a magnet support ring that separates from and connects to the braking disc is attached to the fixed frame. It can also be applied to an eddy current type speed reducer of a supporting type.

[0018]

According to the present invention, the non-driving axle of the vehicle is divided into left and right, and the eddy current type speed reducer is arranged on the left and right axles. Therefore, even if the axle is not provided with a differential mechanism, a low friction road surface can be obtained. There is no fear of causing a car body spin.

The transmission mechanism accelerates the rotation of the axle and transmits the rotation to the rotation shaft. If the gear ratio can be manually changed from the outside, the downhill is used for daily traveling like a regular transportation vehicle. Appropriate deceleration braking corresponding to the gradient of is obtained.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view of a braking device for a vehicle according to the present invention.

FIG. 2 is a front sectional view showing an essential part of an eddy current type speed reducer used in the braking device.

[Explanation of symbols]

C: Transmission mechanism 2: Axle case 3: Axle 14: Rotating shaft 27: Wheel

Claims (1)

[Claims] Claim: What is claimed is: 1. An axle supporting left and right wheels is divided, and each axle and a pair of rotating shafts arranged outside the axle case are interlockingly connected by a transmission mechanism, and an eddy current is applied to each rotating shaft. A braking device for a vehicle, which comprises a speed reducer and applies braking force to the left and right wheels independently.