JP3004856B2 - Rear suspension used for rear two-axle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear suspension used for a rear two-axle vehicle, and more particularly to a rear suspension combined with a rocker beam.

[0002]

2. Description of the Related Art A rear suspension combined with a rocker beam used in a rear two-axle vehicle of this type is designed in such a manner that a load is distributed at a predetermined ratio between a front axle after driving and a rear axle after being driven. Is common. And, in that case, when the axle weight of the post-drive front axle is larger than that of the post-drive rear axle, the load capacity is distributed to the post-drive front axle and the post-drive rear axle, and In general, it is possible to secure a driving force during light loading. However, in the case of a rear suspension combined with a rocker beam designed in such a manner, when the total weight of the vehicle is increased, the axle load is excessively applied to the front axle after driving when the vehicle is heavily loaded.

Further, when the rear suspension with rocker beam is designed in such a manner that its load is evenly applied to the front axle after the driving and the rear axle after the following, the driving on the bumpy road or the sloping road is performed. The shared load distributed to the rear and front axles is no longer applied sufficiently, and the driving wheels slip to deteriorate the startability. Further, even on a slippery road surface, the drive wheels cause slip and idle. Furthermore, even when the vehicle is empty or lightly loaded, the axle weight of the front axle is reduced after the driving, and the required driving force cannot be secured on the driving wheels, which also causes a problem in the startability.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to increase the axle load of a continuously driven axle within a range in which the load shared by the rear two axles is distributed within an allowable load range to avoid overloading of each axle. Rear and rear axles used to ensure starting when lightly loaded and to ensure safe driving, and to improve startability on slopes and snowy roads
In providing suspension.

[0005]

Means corresponding to the object and the operation thereof
A pair of rocker beams supported on the trunnion shaft of the frame and supporting the rear axle after being driven between the rear ends; and a pair of rocker beams disposed in front of the trunnion shaft, the front end being supported by the frame, and the rear end being the pair. Correspondingly connected to the front end of the rocker beam via a shackle, and
A pair of leaves that support the front axle on the frame after driving
A spring, an air bag means supported by the frame and constantly applying a predetermined load to the front axle in a downward direction after driving, and a supply pressure set to supply compressed air from the air pressure source to the air bag means. A pressure regulating valve, a pressure regulating valve set at the exhaust pressure and discharging compressed air from the air bag means to the atmosphere, and a pressure damper communicated with the air bag means always include a front axle after the drive. It is pushed downward by the air bag means, and after the driving, the set share load of the front axle becomes larger than the state where the function of the air bag means is lacking.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of a rear suspension used in a rear two-axle vehicle of the present invention will be described.
This will be described with reference to the drawings. FIGS. 1 and 2 show a specific example of a rear suspension used in a rear axle of the present invention, which is applied to a heavy truck 40 using a rear axle 43 after driving and a rear axle 44 after driven. Example 10 is shown, in which the rear suspension 10 is configured to be used together with a rocker beam, and is supported on a frame 41 of the truck 40 by being supported between the left and right side rails 42, 42. A pair of rocker beams 12, 12 slidably supported by the trunnion shaft 11 and supporting the driven rear axle 44 between rear ends thereof; and a pair of rocker beams 12, 12 disposed in front of the trunnion shaft 11, Are the left and right sides of the frame 41
The rear ends of the pair of rocker beams 12, 12 are supported by rails 42, 42 and are connected to the front ends of the pair of rocker beams 12, 12 via shackles 14, 14, respectively.
A pair of leaf springs 13, 13 supporting the frame 41 on the frame 41, a pair of shock absorbers 15, 15 arranged between the left and right side rails 42, 42 of the frame 41 and the front axle 43 after driving, A pair of shock absorbers 16, 16 disposed between the left and right side rails 42, 42 of the frame 41 and the rear axle 44 after being driven, and a predetermined load supported by the frame 41 and constantly applying a predetermined load to the front after driving. An air bag means 17 for pressing the axle 43 in the downward direction, and a pressure regulating valve 19 which is set at a supply pressure and supplies compressed air from the air pressure source 18 to the air bag means 17.
A pressure regulating valve 20 set at the exhaust pressure and discharging compressed air from the air bag means 17 into the atmosphere;
7 and a pressure damper 21 connected to the pressure damper 21.

Of course, in the heavy truck 40 to which the rocker-beam combined rear suspension 10 is applied, two driving wheels (not shown) are normally supported on both ends of the front axle 43 after driving. In addition, two driven wheels (not shown) are normally supported at both ends of the rear axle 44 after the driven. After the drive, the front axle 43
It is also normally connected to a differential (not shown) built into the differential carrier 45.

The trunnion shaft 11 is supported and passed between a pair of trunnion brackets 23, 23 which are disposed and screwed corresponding to the left and right side rails 42, 42 of the frame 41, and The rocker beams 12, 12 are supported at both ends so as to be vertically swingable.

The pair of rocker beams 12, 12 are:
After the driven rear axle 44 is passed between its rear ends, the driven rear axle 44 is vertically lifted and supported so as to be able to be lowered, while its front end is connected to the lower ends of the shackles 14, 14 by pins 24, 24. Are connected correspondingly.

The pair of leaf springs 13, 13
Are formed at the front end thereof,
5 and 25 are connected to the rear front spring brackets 27 and 27 of the left and right side rails 42 and 42 of the frame 41 via pins 28 and 28, and similarly, the eyeballs 26 and 26 are provided at the rear end. Forming the centerpiece 26, 26 is connected to the upper end of the shackle 14, 14 via a pin 29, 29,
After the drive, the front axle 43 is supported on the frame 41 by bolting.

The air bag means 17 uses an air spring, and the air spring 17 has a diaphragm type having a bottom anchor plate 30 at a lower end thereof and a top anchor plate 31 at an upper end thereof. And fixedly disposed between the lower bracket 32 and the upper bracket 33,
A predetermined load generated, that is, a predetermined force is applied to the front axle 43 in a pushing direction after the driving. Of course, the lower bracket 32 is attached to the differential carrier 4.
5 while its upper bracket 33 is formed in a cross beam and its left and right side brackets are located adjacent to the rear of the front axle 43 after its driving.
Since it is fixedly passed between the rails 42, 42, the air spring 17 is attached to the bottom anchor plate 3.
0 is screwed to the lower bracket 32 and the top anchor plate 31 is screwed to the upper bracket 33, so that the generated predetermined load is always applied to the front axle 43 in the pushing direction after the driving.

A pressure regulating valve 19 set to the supply pressure is arranged in the middle of a pneumatic pipe 34 connecting the air spring 17 to the pneumatic source 18, and the compressed air of the pneumatic source 18 is kept at a constant pressure. Depressurized and supplied to the air spring 17 and the air spring 17
Keep the internal pressure at the set value. That is, the pressure regulating valve 19
Is to constantly generate the predetermined force used as the predetermined load on the air spring 17 by keeping the pressure in the air spring 17 at a predetermined value. In particular, the supply pressure increases the axle load on the front axle 43 after the drive in a range where the shared load of the two axles 43 and 44 is then distributed within the allowable load range and the axle load of each axle 43 and 44 is avoided. When the vehicle is vacant and lightly loaded, the driving force is set at a position where the driving force can be secured on the front axle 43 after the driving. In this case, the air pressure source 18 includes a compressor (not shown) driven by a diesel engine (not shown) mounted on the heavy truck 40, a wet tank (not shown), and a reservoir. -It is constituted normally by the tank 22.

The pressure regulating valve 20 set to the exhaust pressure uses a relief valve, and the air spring 1
7 is connected to a branch pipe 35 branched from the pneumatic pipe 34 between the pressure regulating valve 19 and the pressure regulating valve 19 to discharge compressed air from the air spring 17 to the atmosphere. Of course, the exhaust pressure of the relief valve 20 is set higher than the supply pressure. More specifically, the exhaust pressure of the relief valve 20 is changed by the supply pressure of the pressure regulating valve 19 to the two shafts 43 and 44 thereafter.
Is distributed in the range of the allowable load, and each axle 43, 4
4 is set in a range in which the axle load over is avoided, so that each of the axles 43 and 44 is related to the set supply pressure.
Are appropriately set within a range in which the overload of the shaft is avoided.

As the pressure damper 21, a surge tank is used, and the surge tank 21 is fixedly supported on one of the left and right side rails 42 adjacent to the upper bracket 33. Then, it is connected to the air spring 17 by a communication pipe 36.

In the rocker / beam combined rear suspension 10 embodied in such a manner and applied to the heavy truck 40, the compressed air is reduced to a set supply pressure by the pressure regulating valve 19 and the reservoir tank 22 is compressed. Is supplied from the air spring 17 to the air spring 17, and the air spring 17 maintains the internal pressure at a predetermined value to generate a predetermined load, that is, a predetermined force, and applies the predetermined force to the air spring 17 before driving. Act on axle 43.

As described above, since the predetermined force generated by the air spring 17 is applied to the front axle 43 after the driving in the pushing direction, the front axle 43 after the driving
The axle load is increased by the predetermined force, and then the two shafts 43,
The shared load of 44 is appropriately distributed within the range of the allowable load, so that the axle load over on the front axle 43 after driving and the rear axle 44 after driven is avoided, and the heavy truck 40 is used under running conditions, road conditions, road surface conditions, and the like. For example, on slippery roads, bumpy roads, hills, etc., the driving wheels are prevented from slipping and can be driven reliably, and the driving force is ensured when the vehicle is empty and lightly loaded, and starting is advantageous. . Further, thereafter, the axle weights of the two shafts 43 and 44 can be distributed closer to equalization, and as a result, the total vehicle weight can be set larger.

As will be apparent from the specific embodiments of the present invention described above with reference to the drawings, one of ordinary skill in the art to which the present invention pertains will appreciate the subject matter of the present invention. Is the nature of the invention (na
), and are readily embodied in other aspects that are objectively perceived as inherent in them. Of course, the contents of the present invention are indispensable for the establishment of the invention corresponding to the subject of the invention.

[0018]

As will be understood from the above description, the rear suspension used in the rear two-axle vehicle of the present invention is a pair of rear suspensions supported by the trunnion shaft of the frame and supporting the rear axle after being driven between the rear ends. A rocker beam and a forward end of the trunnion shaft, a front end supported by the frame, a rear end correspondingly connected to a front end of the pair of rocker beams via a shackle, and A pair of leaf springs supporting the front axle on the frame, air bag means supported on the frame and constantly applying a predetermined load to the front axle after driving the front axle;
A pressure regulating valve set at the supply pressure to supply compressed air from the air pressure source to the air bag means, a pressure regulating valve set at the exhaust pressure to discharge compressed air from the air bag means to the atmosphere, and the air bag means In the rear suspension used for the rear two-axle vehicle of the present invention, the axle weight of the front axle is always increased by a predetermined load after the drive, and when the vehicle is idle and light At the time of loading, the driving force is secured on the front axle after driving, and starting is ensured.
After that, the shared load of the two axles is distributed within the allowable load range, axle load over is avoided on each axle, and slippery roads,
Slip of the drive wheel and the slip of the drive wheel due to the slip are suppressed on a bumpy road, a slope, and the like, whereby starting and running are ensured, and accordingly, safe running is ensured. Can be distributed near the equalization, and accordingly, the total weight of the vehicle can be set large. In addition, the spring constant of the air bag means is reduced by the pressure damper, and the compressed air is released from the air bag means. The pressure fluctuation can be reduced when the air is supplied to and exhausted from the pump, and the occurrence of vibration affecting the suspension is suppressed, and the minimum pressure is secured in the air bag means and the pressure damper by the pressure regulating valve set to the exhaust pressure. When the compressed air is discharged into the atmosphere by the collapse of the suspension stroke due to the suspension stroke, excessive collapse of the air bag means occurs. Naturally, smooth expansion and contraction and durability of the air bag means are ensured, and responsiveness of load transmission during supply and discharge of compressed air is ensured by the pressure regulating valve set to the exhaust pressure. As a result, it is very useful and practical for rear two-axle vehicles.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a specific example of a rear suspension used in a rear twin axle of the present invention, which is applied to a large truck using a rear axle after driving and a rear axle after driven on the rear two axles. FIG.

FIG. 2 is a pneumatic circuit diagram of the rear suspension shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Trunnion shaft 12 Rocker beam 13 Leaf spring 15 Shock absorber 16 Shock absorber 17 Air bag means, air spring 19 Pressure regulating valve set to supply pressure 20 Pressure regulating valve set to exhaust pressure 21 Pressure damper

Claims (4)

(57) [Claims] A pair of rockers supported by a trunnion shaft of a frame and supporting a rear axle after being driven between rear ends.
A beam and a forward end of the trunnion shaft, a front end supported by the frame, a rear end correspondingly connected to a front end of the pair of rocker beams via a shackle, and a drive front axle. A pair of leaf springs supported by the frame, air bag means supported by the frame and constantly applying a predetermined load to the front axle after driving in a downward direction, After including a pressure regulating valve for supplying compressed air to the air bag means, a pressure regulating valve set at the exhaust pressure and discharging compressed air from the air bag means to the atmosphere, and a pressure damper communicated with the air bag means Rear suspension used for two-axle vehicles. 2. The rear suspension used in a rear two-axle vehicle according to claim 1, wherein said air bag means is an air spring. 3. The rear suspension used in a rear two-axle vehicle according to claim 1, wherein the pressure regulating valve set to the exhaust pressure is a relief valve. 4. The rear suspension according to claim 1, wherein the pressure damper is a surge tank.