JP3468445B2 - Trailer 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 trailer braking device, and more particularly to a braking device including a retarder attached to a rear shaft of a trailer towed by a tractor.

[0002]

2. Description of the Related Art In large vehicles such as trucks and buses, since a large braking force is required, a retarder for assisting the service brake is provided in the middle of the power line. The rotor of the retarder is designed to rotate in conjunction with the propeller shaft, and when a coil arranged on the stator side is energized, eddy current causes iron loss, and at this time the power line The drive wheels are braked via the.

On the other hand, in the case of a trailer, a rear wheel is provided with a retarder as shown in FIG. 4, for example. That is, the differential gear device 2 is mounted between the left and right axles 1, and the pinion gear 4 meshing with the ring gear 3 of the differential gear device 2 is attached to the rotor of the retarder 5 arranged in front of the differential gear device 2. I was trying to connect directly. In this case, the stator side of the retarder 5 is supported by the axle housing via the housing of the differential gear device 2.

[0004]

According to such a conventional trailer braking device, since one retarder is mounted in front of the differential gear unit 2, a sufficient braking force is not necessarily required. Could not be generated.

Therefore, as shown in FIG. 5, for example, a pair of pinion gears 4 and 6 are arranged in front and rear so as to mesh with a ring gear 3 of a differential gear device 2 arranged between the left and right axles 1, and a front pinion gear is arranged. 4 is directly connected to the rotor of the front retarder 5, and the rear pinion gear 6 is directly connected to the rotor of the rear retarder 7.

According to such a structure, the differential gear device 2
It becomes possible to attach the retarders 5 and 7 to the front and the rear of the vehicle, respectively, whereby a large braking force can be applied to the rear wheels of the trailer. However, in such a structure, the dedicated differential gear unit 2 having a special structure must be provided, and particularly, the structure of the casing of the differential gear unit to be coupled with the axle housing becomes large, and
It has the drawback of increasing complexity and thus increasing manufacturing costs.

The present invention has been made in view of the above problems, and a braking device for a trailer, which does not have a special structure and is capable of applying a large braking force to the trailer. The purpose is to provide.

[0008]

According to the present invention, a through shaft extending in the front-rear direction of a vehicle is arranged so as to intersect with an axle of a rear wheel of a trailer, the through shaft is interlocked with the axle, and the axle of the axle is connected. Retarders are arranged at the front and the rear, respectively, and the rotor of the retarder is connected to the front end side and the rear end side of the through shaft.
The present invention relates to a trailer braking device.

A differential gear device is interposed between the left and right rear wheel axles of the trailer, and a gear mounted on a pinion gear that meshes with a ring gear of the differential gear device and a gear on the through shaft. May mesh with each other.

Further, the front retarder and the rear retarder may be supported by the housing of the rear wheel axle, respectively.

[0011]

FIG. 1 shows a semi-trailer vehicle including a trailer and a semi-tractor having a braking device according to an embodiment of the present invention. The semi-trailer vehicle is composed of a tractor 10 and a trailer 11. The tractor 10 includes front wheels 12 and rear wheels 13, the front wheels 12 being steered wheels and the rear wheels 13 being drive wheels. On the other hand, the trailer 11 is supported by the rear wheel 14 at the rear side thereof, but is not provided with the front wheel, and the front of the trailer 11 is towed while being supported by the tractor 10 via the coupler 15. ing.

Next, a braking device attached to the axle portion of the rear wheel 14 of the trailer 11 pulled by the tractor 10 will be described. Trailer 11
The left and right rear wheel axles 19, 20 are interlocked with each other via the differential gear device shown in FIG. Axle 19,
Side gears 21 are attached to the front ends of the respective gears 20, and the side gears 21 mesh with a differential pinion 23 supported on a spider 22.
The spider 22 is supported by the differential case 24.

A ring gear 27 is fixed to the left side end of the differential case 24. The ring gear 27 meshes with the pinion gear 28 shown in FIGS. 3 and 2. Then, at the tip of the boss of the pinion gear 28, the gear 2
9 is fixed, and the gear 29 meshes with the gear 30. The gear 30 is fixed on the through shaft 31.

The front end side of the through shaft 31 is directly connected to the rotor 36 of the front retarder 35. A stator yoke 38 is attached to the case 37 of the retarder 35, and the coil 3 is attached to the stator yoke 38.
9 is wound.

On the other hand, the rear end of the through shaft 31 is connected to the rotor 44 of the rear leader 43. The rotor 44 is rotatably arranged in a case 45, and a coil 47 is wound around a stator yoke 46.

In the above structure, the trailer 11
When the vehicle is run while being pulled by the tractor 10, the rear wheels 14 support the rear end portion of the trailer 11 while rolling on the road surface. The rotation of the rear wheel 14 causes the left and right axles 19 and 20 shown in FIG. 3 to be rotationally driven. The rotation of the left and right axles 19 and 20 is transmitted to the pinion gear 28 via a differential gear device including a side gear 21, a differential pinion 23, a spider 22, and a differential case 24 to which a ring gear 27 is attached. .

Therefore, when the trailer 11 travels, the pinion gear 28 is driven via the differential gear device. The pinion gear 28 is rotated by the gears 29, 30, the through shaft 3
1 is transmitted to the front and rear retarders 35 and 43, and the rotors 36 and 44 of these retarders 35 and 43 are rotationally driven. Therefore, by energizing the coils 39 and 47 of these retarders 35 and 43, respectively, these retarders 35 and 43 generate a braking force and apply the braking force to the rear wheels 14 of the trailer 11.

When both the front and rear retarders 35 and 43 are inactive, the rear wheel 14 is not braked. On the other hand, when only one of the front and rear retarders 35 and 43 is operated, a relatively slight braking force is applied. On the other hand, when both the front and rear retarders 35 and 43 are operated, the braking force is applied to the rear wheel 14 with a large braking force. Therefore, the magnitude of the braking force applied to the rear wheels 14 of the trailer 11 can be adjusted according to the state of the vehicle and the running state. Further, the braking force is adjusted by adjusting the amount of current flowing through the coils 39 and 47 of the front and rear retarders 35 and 43.

As described above, the trailer braking device according to the present embodiment is provided with the front retarder 35 and the rear retarder 35 in front of and behind the through shaft 31 arranged in the vehicle front-rear direction so as to intersect the axles 19 and 20, respectively. The retarder 43 is connected to the retarder 43. Such a structure
Based on the conventional tandem type diff carrier, the front and rear differential limiting devices are eliminated, and the brake retarders 35 and 43 are attached to the front and rear coupling portions of the through shaft 31. Therefore, the brake retarder can be arranged by effectively utilizing the structure of the tandem type differential carrier.

In addition, this structure uses the casing attached to the axle housing to form the front and rear retarders 3
Since the support members 5 and 43 are respectively supported, the front and rear retarders 35 and 43 are arranged under the spring, and the propeller shaft for transmitting the driving force becomes unnecessary. For this reason, most of the parts can be shared with the parts of the tandem type diff carrier, and since many parts are unnecessary, the trailer braking device can be assembled at low cost.

[0021]

As described above, according to the present invention, the through shaft extending in the front-rear direction of the vehicle is arranged so as to intersect with the axle of the rear wheel of the trailer, and the through shaft is interlocked with the axle, and in front of the axle. Retarders are arranged at the rear and the rotors of the retarders are connected to the front end side and the rear end side of the through shaft, respectively.

Therefore, according to the present invention, it is possible to provide a braking device having a pair of retarders arranged in front of and behind the axle shaft with a simple structure, and a trailer having a simple structure and low cost can be braked. The equipment can be provided.

A differential gear device is interposed between the left and right rear axles of the trailer, and a gear mounted on a pinion gear that meshes with a ring gear of the differential gear device meshes with a gear on the through shaft. According to this structure, most parts can be shared with the tandem diff carrier, which makes it possible to provide a trailer braking device at a lower cost.

According to the structure in which the front retarder and the rear retarder are respectively supported by the housings of the axles of the rear wheels, both the front and rear retarders can be attached to the unsprung part, and the exclusive use for transmitting the braking force is required. No need for propeller shaft.

[Brief description of drawings]

FIG. 1 is a side view of a semi-trailer vehicle including a trailer and a tractor including a braking device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing a trailer braking device.

FIG. 3 is a lateral cross-sectional view of a main part of a brake device for a trailer.

FIG. 4 is a transverse cross-sectional view of a main part showing a conventional trailer braking device.

FIG. 5 is a transverse cross-sectional view of a main part showing a conventional trailer braking device.

[Explanation of symbols]

1 axle 2 differential gear 3 ring gear 4 pinion gear 5 retarder (front) 6 pinion gear 7 retarder (rear) 10 tractors 11 trailers 12 front wheels 13 rear wheels 14 rear wheels 15 coupler 19, 20 axle 21 Side gear 22 Spider 23 Defpinion 24 differential case 27 ring gear 28 pinion gear 29, 30 gears 31 through shaft 35 retarder (forward) 36 rotor 37 cases 38 Stator yoke 39 coils 43 retarder (rear) 44 rotor 45 cases 46 Stator yoke 47 coils

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-144248 (JP, A) JP-A-7-194091 (JP, A) JP-A-8-105466 (JP, A) JP-A-8- 58413 (JP, A) JP 8-238949 (JP, A) Actual development 7-23678 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60T 1/06 B60T 1 / 087 H02K 49/02

Claims (3)

(57) [Claims] 1. A through shaft extending in the front-rear direction of a vehicle is arranged so as to intersect with an axle of a rear wheel of a trailer, the through shaft is interlocked with the axle, and retarders are provided in front of and behind the axle, respectively. A brake device for a trailer, wherein the rotor of the retarder is connected to a front end side and a rear end side of the through shaft. 2. A gear mounted on a pinion gear meshing with a ring gear of the differential gear and a gear on the through shaft, wherein a differential gear is interposed between the left and right rear wheel axles of the trailer. The brake device for a trailer according to claim 1, wherein and are in mesh with each other. 3. The braking device for a trailer according to claim 1, wherein the front retarder and the rear retarder are respectively supported by a housing of the axle of the rear wheel.