CN108995640B - Vehicle, braking force distribution system and load sensing deformation amplifying mechanism thereof - Google Patents
Vehicle, braking force distribution system and load sensing deformation amplifying mechanism thereof Download PDFInfo
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- CN108995640B CN108995640B CN201811045555.2A CN201811045555A CN108995640B CN 108995640 B CN108995640 B CN 108995640B CN 201811045555 A CN201811045555 A CN 201811045555A CN 108995640 B CN108995640 B CN 108995640B
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- radial arm
- load
- load sensing
- amplifying mechanism
- distribution system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
Abstract
The invention discloses a load-sensing deformation amplifying mechanism of a braking force distribution system, which comprises a mounting bracket, a pull rod, a first radial arm and a second radial arm, wherein the mounting bracket is connected to a chassis of a vehicle body and extends downwards; the end of the first radial arm is connected to the pull rod to rotate under the pulling action of the pull rod, the end of the second radial arm is connected to the bottom end of the load sensing spring, and the arm length of the second radial arm is larger than that of the first radial arm. Therefore, after the tail end of the second radial arm rotates synchronously with the first radial arm, the tail end vertical displacement of the first radial arm is amplified by a certain proportion, so that the deformation of the load sensing spring is larger, and the brake pressure distribution precision and the brake pressure control effect of the load sensing proportional valve are improved. The invention also discloses a braking force distribution system and a vehicle, which have the beneficial effects as described above.
Description
Technical Field
The invention relates to the technical field of vehicle engineering, in particular to a load sensing deformation amplifying mechanism of a braking force distribution system. The invention also relates to a braking force distribution system and a vehicle comprising the load sensing deformation amplifying mechanism.
Background
With the development of the China mechanical industry, more and more mechanical devices are widely used.
In the field of the automotive industry, different kinds of vehicles have been put into production. Vehicles are of various types and can be largely classified into passenger vehicles, commercial vehicles and engineering vehicles. The engineering vehicles comprise various construction vehicles such as traction vehicles (trailer, trailer and the like), pump trucks, cranes, concrete transport vehicles and the like. For example, a traction vehicle is a large truck or a semitrailer which is pulled between a truck head and a truck bed through tools, and is often used for transporting a large number of goods in a workshop or between workshops, such as transportation from a warehouse in an automobile manufacturing industry to an assembly line, baggage transportation at an airport, and the like.
The traction vehicle has a special working condition, and the traction effect is mainly adopted, so that the traction vehicle requires a large adhesive force of the driving wheels, so that the front axle load and the rear axle load have large differences between the specifications of the wheels, the front wheel brakes are small, the allowable braking force is low, the rear wheel brakes are large, and the allowable braking force is high. In addition, when the traction vehicle is in no-load and full-load traction operation, the front and rear axle loads change greatly, and the vehicle body inertia and the pushing action of traction cargoes are added, so that the front and rear axle loads change more obviously when the traction vehicle is braked.
At present, four-wheel brake pipe systems are generally arranged on traction vehicles, and are mainly divided into a single-pipe brake system and a double-pipe brake system. The brake fluid output by the master pump is distributed to four brakes by a tee joint or a four-way joint, and the pressure of each brake is the same. The single-pipeline braking system is not backed up, and after one point leaks, the pressure of the whole system is affected until the pressure is zero, so that the braking is completely disabled, the safety level is low, and the application is less and less. The double-pipeline braking system consists of two pipeline systems, the two pipeline systems are mutually independent, one pipeline system cannot be influenced when the other pipeline system fails, the safety level is high, and the application is wider and wider.
The dual-pipeline braking system is also divided into a pressure-equalizing dual-pipeline braking system and a pressure-dividing dual-pipeline braking system, wherein the pressure-equalizing dual-pipeline braking system is characterized in that: each pipeline is distributed to two brakes, and the front braking pressure and the rear braking pressure are the same, so that the maximum braking pressure cannot exceed the allowable braking pressure of the brakes, namely, the allowable braking pressure is provided according to a small value, meanwhile, in order to prevent the wheels from slipping, the braking force cannot exceed the adhesive force of the wheels, the two braking pressures take small values, the braking pressure is low, the adhesive force of the wheels cannot be fully utilized, the braking force of the whole vehicle is small, the braking distance is long, and therefore the application of the isobaric double pipeline system is less and less. The pressure-dividing double-pipeline braking system can provide different pressures, meets the requirements of the brake on different allowable pressures, and can also utilize the adhesive force of wheels as much as possible to obtain a better braking effect, so that the pressure-dividing double-pipeline system is increasingly applied.
In order to solve the problem that braking force distribution of a partial pressure double-pipeline system is not matched with the load of a front axle and a rear axle of a vehicle, a load sensing proportional valve is generally additionally arranged on the vehicle in the prior art, the load sensing proportional valve senses the load of the front axle and the rear axle, and the deformation of a vehicle-mounted plate spring and the deformation of the load sensing spring are utilized to control the movement of a valve core of the load sensing proportional valve, so that real-time braking pressure of the front axle and the rear axle is reasonably distributed, and wheels are prevented from slipping and a whole vehicle is prevented from swinging. However, the rigidity of the vehicle-mounted plate spring is generally larger, a plurality of plate springs are mutually stacked into a whole, the elastic deformation amount of the vehicle-mounted plate spring is very small even when the serious load change occurs to the vehicle, the deformation amount of the load sensing spring is very small, the stress change of the valve core control rod is slight, the control requirement of the load sensing proportional valve on the movement of the valve core cannot be met, and the problems of inaccurate brake pressure distribution proportion, insensitive brake pressure control and insignificant control effect of the load sensing proportional valve are caused.
Therefore, how to properly increase the deformation amount of the load sensing spring and improve the brake pressure distribution precision and the brake pressure control effect of the load sensing proportional valve is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a load sensing deformation amplifying mechanism of a braking force distribution system, which can properly increase the deformation quantity of a load sensing spring and improve the braking pressure distribution precision and the braking pressure control effect of a load sensing proportional valve. It is a further object of the present invention to provide a braking force distribution system and a vehicle.
In order to solve the technical problems, the invention provides a load-sensing deformation amplifying mechanism of a braking force distribution system, which comprises a mounting bracket connected to a chassis of a vehicle body and extending downwards, a pull rod connected to a drive axle and extending upwards, a first rotating arm rotatably connected to the mounting bracket, and a second rotating arm rotatably connected to the mounting bracket and rotating synchronously with the first rotating arm; the end of the first radial arm is connected to the pull rod to rotate under the pulling action of the pull rod, the end of the second radial arm is connected to the bottom end of the load sensing spring, and the arm length of the second radial arm is larger than that of the first radial arm.
Preferably, the head end of the first radial arm is inserted into the mounting hole of the mounting bracket through the intermediate shaft.
Preferably, the head end of the second radial arm is connected to the intermediate shaft.
Preferably, the pull rod extends in a vertical direction towards the load sensing proportional valve.
Preferably, a bolt is arranged at the tail end of the first radial arm, and the top end of the pull rod is arranged in a through hole of the bolt in a penetrating mode.
Preferably, an adjusting nut for adjusting the pretightening force of the load sensing spring is arranged at the top end of the pull rod.
The invention also provides a braking force distribution system, which comprises a load sensing proportional valve arranged on a chassis of a vehicle body, a plate spring arranged on a drive axle, a load sensing spring connected to a valve core control rod of the load sensing proportional valve, and a load sensing deformation amplifying mechanism connected with the load sensing spring, wherein the load sensing deformation amplifying mechanism is specifically any one of the load sensing deformation amplifying mechanisms.
The invention also provides a vehicle, which comprises a vehicle body and a braking force distribution system arranged on the vehicle body, wherein the braking force distribution system is the braking force distribution system.
Preferably, the vehicle is in particular an industrial vehicle.
The invention provides a load-sensing deformation amplifying mechanism of a braking force distribution system, which mainly comprises a mounting bracket, a pull rod, a first radial arm and a second radial arm. Wherein the mounting bracket is attached to the vehicle body underframe and extends downward, i.e., toward the drive axle. The pull rod is arranged on the drive axle and extends upwards, i.e. towards the bracket. The first end of the first radial arm is connected to the mounting bracket and can rotate on the mounting bracket, and the tail end of the first radial arm is connected to the pull rod and can rotate clockwise or anticlockwise under the pulling action of the pull rod. The first end of the second radial arm is also connected to the mounting bracket and can rotate on the mounting bracket, and importantly, the second radial arm and the first radial arm rotate synchronously, or the first radial arm drives the second radial arm to synchronously rotate in the rotating process, which is equivalent to the angular speed of the first radial arm being equal to the angular speed of the second radial arm. Simultaneously, the end connection of second radial arm is on the bottom of feeling the year spring, and when the second radial arm rotated, can drive the bottom of feeling the year spring and carry out the extension to it to increase or reduce its stretching quantity. And, the arm length of the second radial arm is longer than that of the first radial arm, and therefore, the end vertical displacement amount of the second radial arm is greater than that of the first radial arm. The tail end of the first radial arm is driven by the pull rod, so that the vertical displacement of the tail end of the first radial arm is the vertical interval change between the chassis of the vehicle body and the driving axle when the load changes. The end vertical displacement of the second radial arm is amplified by a certain proportion after synchronous rotation with the first radial arm, and the change of the deformation quantity of the load sensing spring is amplified, so that the brake pressure distribution precision and the brake pressure control effect of the load sensing proportional valve can be improved more favorably. In summary, the load sensing deformation amplifying mechanism of the braking force distribution system provided by the invention can properly increase the deformation amount of the load sensing spring, and improve the braking pressure distribution precision and braking pressure control effect of the load sensing proportional valve.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall structure of an embodiment of the present invention.
Wherein, in fig. 1:
the automobile body chassis-1, transaxle-2, sense and carry proportional valve-3, case control lever-301, leaf spring-4, sense and carry spring-5, installing support-6, pull rod-7, first radial arm-8, second radial arm-9, jackshaft-10, bolt-11, adjusting nut-12.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic overall structure of an embodiment of the present invention.
In one embodiment of the present invention, the load-sensing deformation amplifying mechanism of the braking force distribution system mainly comprises a mounting bracket 6, a pull rod 7, a first radial arm 8 and a second radial arm 9.
Wherein the mounting bracket 6 is attached to the vehicle body underframe 1 and extends downwards, i.e. towards the drive axle 2. The tie rod 7 is arranged on the drive axle 2 and extends upwards, i.e. towards the bracket.
The first radial arm 8 is connected at its head end to the mounting bracket 6 and is rotatable on the mounting bracket 6, while the second radial arm 8 is connected at its tail end to the pull rod 7 and is rotatable clockwise or counterclockwise under the pulling action of the pull rod 7.
The first end of the second radial arm 9 is also connected to the mounting bracket 6 and can rotate on the mounting bracket 6, and importantly, the second radial arm 9 and the first radial arm 8 rotate synchronously, or the first radial arm 8 drives the second radial arm 9 to rotate synchronously in the rotation process, which is equivalent to that the angular velocity of the first radial arm 8 is equal to that of the second radial arm 9.
Meanwhile, the tail end of the second radial arm 9 is connected to the bottom end of the load sensing spring 5, and when the second radial arm 9 rotates, the bottom end of the load sensing spring 5 can be driven to stretch, so that the stretching amount of the load sensing spring is increased or reduced. Also, the arm length of the second arm 9 is longer than that of the first arm 8, and therefore, the end vertical displacement amount of the second arm 9 is greater than that of the first arm 8.
The tail end of the first radial arm 8 is driven by the pull rod 7, so that the vertical displacement of the tail end of the first radial arm 8 is the vertical distance between the chassis 1 of the vehicle body and the driving axle 2 when the load changes. The vertical displacement of the end of the second radial arm 9 is amplified by a certain proportion after being synchronously rotated with the first radial arm 8, so that the change of the deformation of the load sensing spring 5 is amplified, which is more beneficial to improving the brake pressure distribution precision and the brake pressure control effect of the load sensing proportional valve 3.
In summary, the load sensing deformation amplifying mechanism of the braking force distribution system provided by the embodiment can appropriately increase the deformation amount of the load sensing spring, and improve the braking pressure distribution precision and the braking pressure control effect of the load sensing proportional valve.
As shown in the figure, in a natural state, the valve element control lever 301 is spaced from the end of the first arm 8 by H1, the valve element control lever 301 is spaced from the end of the second arm 9 by H2, and when a load change occurs, the first arm 8 rotates up and down by the pulling action of the pull rod 7, and a displacement in the vertical direction, i.e., a displacement in the figure Δh1, occurs. Then, since the second arm 9 rotates in synchronization with the first arm 8, when the end of the first arm 8 is vertically displaced by Δh1, the end of the second arm 9 is vertically displaced by Δh2. Obviously, Δh2=l2/l1×Δh1, since L2 is larger than L1, Δh2 is several times larger than Δh1, that is, the displacement amount generated at the end of the first arm 8 is amplified several times.
In a preferred embodiment with respect to the first radial arm 8 and the second radial arm 9, the head end of the first radial arm 8 is rotatably connected to the mounting bracket 6 via an intermediate shaft 10. Specifically, the intermediate shaft 10 may be mounted on the mounting bracket 6 by welding or other connecting members, for example, two ends of the intermediate shaft 10 may be respectively welded between two opposite side plates disposed on the mounting bracket 6. The first radial arm 8 and the first end of the second radial arm 9 can rotate around the intermediate shaft 10, for example, a rotatable sleeve can be sleeved on the circumferential surface of the intermediate shaft 10, and then the first radial arm 8 and the first end of the second radial arm 9 are connected to the sleeve through welding or other connecting pieces, so that the first radial arm 8 and the second radial arm 9 can coaxially and synchronously rotate by taking the intermediate shaft 10 as a rotating shaft.
In a preferred embodiment with respect to the pull rod 7, one end of the pull rod 7 may be vertically disposed on the surface of the transaxle 2, while the length direction of the pull rod 7 may be vertical, i.e., vertically extended upward toward the load sensing proportional valve 3. Typically, the pull rod 7 may be disposed on the drive axle 2 opposite the load sensing proportional valve 3.
In order to facilitate the smooth driving of the first radial arm 8 and the second radial arm 9 to coaxially and synchronously rotate by the pull rod 7, in this embodiment, a pin 11 may be installed on the end surface of the first radial arm 8, the pin 11 is generally horizontally arranged (as shown in the drawing, perpendicular to the paper surface direction), and a through hole is vertically formed at the outer end position of the pin 11, and the top end of the pull rod 7 extends above the pin 11 through the through hole. An adjusting nut 12 is provided at the top end of the pull rod 7 through a screw connection sleeve, and the pull rod 7 is prevented from coming out of the through hole of the plug 11 by the locking action of the adjusting nut 12. So arranged, the top end of the pull rod 7 is connected with the first radial arm 8 in a one-way.
Specifically, when the bridge load moves backward and the plate spring 4 is compressed and sags, the pull rod 7 moves downward synchronously, and the first radial arm 8 is pulled to rotate anticlockwise as shown in the figure by the downward abutting pressure of the adjusting nut 12 to the upper end of the bolt 11, so that the second radial arm 9 is driven to rotate synchronously, and the load sensing spring 5 is stretched. On the contrary, when the bridge load moves forward and the plate spring 4 is loosened and lifted, the pull rod 7 rises synchronously, but the pull rod 7 cannot directly drive the first radial arm 8 to rotate clockwise as shown in the figure because of unidirectional connection with the first radial arm 8; however, at this time, when the pull rod 7 is lifted, the load sensing spring 5 is loosened, the bottom of the load sensing spring 5 is retracted, the second radial arm 9 is driven to rotate clockwise as shown in the figure, and the first radial arm 8 is driven to rotate synchronously until the gap between the bolt 11 on the first radial arm 8 and the adjusting nut 12 at the top end of the pull rod 7 is eliminated, so that the impact of the pull rod 7 on other parts in the amplifying mechanism can be reduced.
In addition, by the screwing operation of the adjusting nut 12 on the top end of the pull rod 7, the maximum up-down displacement amount of the pull rod 7 can be manually adjusted, and the pretightening force and deformation amount of the load sensing spring 5 can be further adjusted.
The present embodiment also provides a braking force distribution system, which mainly includes a load sensing proportional valve 3 disposed on a chassis 1 of a vehicle body, a leaf spring 4 disposed on a driving axle 2, a load sensing spring 5 connected to a valve core control rod 301 of the load sensing proportional valve 3, and a load sensing deformation amplifying mechanism connected to the load sensing spring 5, wherein the specific content of the load sensing deformation amplifying mechanism is the same as the related content, and will not be repeated here.
The embodiment also provides a vehicle, which mainly includes a vehicle body and a braking force distribution system disposed on the vehicle body, wherein the specific content of the braking force distribution system is the same as the related content, and is not repeated here.
The vehicle in this embodiment specifically refers to an industrial vehicle, such as a traction vehicle, although other types of engineering vehicles may be used as well.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The load sensing deformation amplifying mechanism of the braking force distribution system is characterized by comprising a mounting bracket (6) connected to a vehicle body underframe (1) and extending downwards, a pull rod (7) connected to a drive axle (2) and extending upwards, a first radial arm (8) rotatably connected to the mounting bracket (6), and a second radial arm (9) rotatably connected to the mounting bracket (6) and rotating synchronously with the first radial arm (8); the end connection of first radial arm (8) is in on pull rod (7) to rotate under its pulling effect, the end connection of second radial arm (9) is on the bottom of sensing load spring (5), just the arm length of second radial arm (9) is greater than the arm length of first radial arm (8), the end vertical displacement of first radial arm (8) is when the load changes vehicle body chassis (1) with the vertical interval of transaxle (2) changes.
2. The load-sensing deformation amplifying mechanism according to claim 1, wherein the head end of the first radial arm (8) is inserted into the mounting hole of the mounting bracket (6) through an intermediate shaft (10).
3. Load-sensing deformation amplifying mechanism according to claim 2, wherein the head end of the second radial arm (9) is connected to the intermediate shaft (10).
4. A load sensing deformation amplifying mechanism according to any of claims 1-3, wherein the tie rod (7) extends in a vertical direction towards the load sensing proportional valve (3) of the brake force distribution system.
5. The load-sensing deformation amplifying mechanism according to claim 4, wherein a plug pin (11) is arranged at the tail end of the first rotating arm (8), and the top end of the pull rod (7) is arranged in a through hole in the plug pin (11) in a penetrating mode.
6. The load-sensing deformation amplifying mechanism according to claim 5, wherein an adjusting nut (12) for adjusting the pretightening force of the load-sensing spring (5) is arranged at the top end of the pull rod (7).
7. A braking force distribution system, comprising a load sensing proportional valve (3) arranged on a vehicle body underframe (1), a plate spring (4) arranged on a drive axle (2), a load sensing spring (5) connected to a valve core control rod (301) of the load sensing proportional valve (3), and a load sensing deformation amplifying mechanism connected with the load sensing spring (5), wherein the load sensing deformation amplifying mechanism is specifically a load sensing deformation amplifying mechanism according to any one of claims 1-6.
8. A vehicle comprising a vehicle body and a brake force distribution system arranged on the vehicle body, characterized in that the brake force distribution system is in particular a brake force distribution system according to claim 7.
9. The vehicle according to claim 8, characterized in that the vehicle is in particular an industrial vehicle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811045555.2A CN108995640B (en) | 2018-09-07 | 2018-09-07 | Vehicle, braking force distribution system and load sensing deformation amplifying mechanism thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811045555.2A CN108995640B (en) | 2018-09-07 | 2018-09-07 | Vehicle, braking force distribution system and load sensing deformation amplifying mechanism thereof |
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| CN108995640A CN108995640A (en) | 2018-12-14 |
| CN108995640B true CN108995640B (en) | 2023-07-07 |
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