CN109100057B

CN109100057B - Tractor load sensor and tractor assembly

Info

Publication number: CN109100057B
Application number: CN201811250683.0A
Authority: CN
Inventors: 孙元
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2018-10-25
Filing date: 2018-10-25
Publication date: 2020-06-23
Anticipated expiration: 2038-10-25
Also published as: CN109100057A

Abstract

The invention relates to a tractor load sensor and a tractor assembly, which comprise a shell, wherein a first oil groove and a second oil groove are arranged in the shell; the first oil groove is opened on the upper surface of the shell; the wear-resistant piston is movably arranged in the first oil groove; the piezoelectric element is arranged on the lower surface of the shell opposite to the second oil groove; the upper electrode and the lower electrode are respectively arranged on the upper surface and the lower surface of the piezoelectric element and are connected with the line interface through leads. According to the technical scheme, the traction pin is pressed on the wear-resistant piston of the tractor load sensor through the tractor load sensor structure, the load borne by the tractor load sensor correspondingly changes along with the change of the load of the trailer, so that the load acts on the piezoelectric material, a voltage signal which correspondingly changes is formed between the upper electrode and the lower electrode of the tractor load sensor, and the load borne by the tractor can be reflected.

Description

Tractor load sensor and tractor assembly

Technical Field

The invention belongs to the technical field of trucks, and particularly relates to a tractor load sensor and a tractor assembly.

Background

The tractor is mutually matched and connected through the tractor and the traction pin 05, so that the combination of the tractor 01 and the trailer 02 is realized. During use, the trailer 02 will distribute its load over the tractor, and therefore the load on the tractor 03 will be the trailer load minus the load on the trailer rear wheels, as shown in figure 1.

The retractor structure of the prior art is shown in fig. 2 and is provided with mounting holes 04 for mating engagement with the retractor pins. The kingpin and kingpin engagement with the retractor is shown in fig. 3 and 4. At present, during the development of a tractor, the load G of the trailer on the tractor is usually calculated according to the tonnage of the trailer and the mechanical stress structure of the tractor, and the actual load borne by the tractor cannot be accurately measured in real time.

Disclosure of Invention

The invention aims to provide a tractor load sensor and a tractor assembly, which are used for solving the problem that the actual load borne by a tractor cannot be accurately measured in real time in the prior art when the tractor is researched and developed.

The invention is realized by the following technical scheme:

a tractor load sensor comprises a shell, wherein a first oil groove and a second oil groove are arranged in the shell; the first oil groove is communicated with the second oil groove through a communicating groove; the first oil groove is opened on the upper surface of the shell;

the wear-resistant piston is movably arranged in the first oil groove;

the piezoelectric element is arranged on the lower surface of the shell opposite to the second oil groove;

the upper electrode is arranged between the upper surface of the piezoelectric element and the lower surface of the shell and is connected with the line interface through a lead;

and the lower electrode is arranged on the lower surface of the piezoelectric element opposite to the upper electrode and is connected with the circuit interface through a lead.

The side wall of the wear-resistant piston is provided with at least one circle of sealing ring grooves, and each sealing ring groove is internally provided with a sealing ring.

The line socket is fixed on the shell.

The shell is U-shaped or semicircular, and the shape of the first oil groove and the shape of the second oil groove are the same as or similar to the shape of the shell.

And the shell is provided with an installation bolt hole.

A retractor assembly comprising a retractor, a retractor pin and a retractor load sensor of any of the above;

the tractor is provided with a traction pin jack, and an opening part of the tractor load sensor and the traction pin jack are oppositely fixed on the tractor;

the traction pin is inserted into the traction pin insertion hole through the opening part of the tractor load sensor, and the traction pin is in compression joint with the upper surface of the wear-resistant piston of the tractor load sensor.

The periphery of a traction pin jack of the tractor is provided with a threaded mounting hole corresponding to a mounting bolt hole on a shell of the tractor load sensor.

The traction pin sequentially comprises a first cylinder, a second cylinder, a third cylinder and a fourth cylinder from top to bottom;

the diameter of the first cylinder is larger than the diameters of the rest three cylinders, the diameter of the third cylinder is the smallest, the traction pin is inserted into the traction pin insertion hole, the traction load sensor is sleeved at the third cylinder, and the lower surface of the second cylinder is in compression joint with the upper surface of the wear-resistant piston.

The invention has the beneficial effects that:

according to the technical scheme, the traction pin is pressed on the wear-resistant piston of the tractor load sensor through the tractor load sensor structure, the load borne by the tractor load sensor correspondingly changes along with the change of the load of the trailer, so that the load acts on the piezoelectric material, a voltage signal which correspondingly changes is formed between the upper electrode and the lower electrode of the tractor load sensor, and the load borne by the tractor can be reflected.

Drawings

FIG. 1 is a schematic illustration of a tractor and trailer configuration according to the prior art;

FIG. 2 is a schematic view of a prior art retractor;

FIG. 3 is a schematic view of a kingpin configuration;

FIG. 4 is a schematic view of a prior art retractor in cooperation with a kingpin;

FIG. 5 is a schematic view of a retractor load cell configuration of the present invention;

FIG. 6 is a schematic view of the retractor load cell configuration with the wear piston removed;

FIG. 7 is a cross-sectional view of the housing of FIG. 6 with the upper surface removed;

FIG. 8 is a top view of FIG. 6;

FIG. 9 is a cross-sectional view A-A of FIG. 8;

FIG. 10 is a schematic view of a wear piston;

FIG. 11 is a schematic view of a seal ring structure;

FIG. 12 is a schematic view of the retractor load cell and retractor assembly;

FIG. 13 is a top view of FIG. 5;

FIG. 14 is a cross-sectional view B-B of FIG. 13;

FIG. 15 is a schematic view of the retractor load sensor in cooperation with the kingpin;

FIG. 16 is a partial cross-sectional view of FIG. 15;

figure 17 is a schematic view of the retractor load cell operation.

Description of the reference numerals

01 tractor, 02 trailer, 03 tractor, 04 mounting hole, 05 towing pin, 101 casing, 102 wear-resistant piston, 103 line socket, 104 piezoelectric element, 105 upper electrode, 106 lower electrode, 107 sealing ring, 111 mounting bolt hole, 112 first oil groove, 113 second oil groove, 114 communicating groove, 121 sealing ring groove, 100 tractor load cell, 200 tractor, 300 towing pin, 400 fixing bolt, 500 hydraulic oil, 301 first cylinder, 302 second cylinder, 303 third cylinder, 304 fourth cylinder.

Detailed Description

The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.

The present application provides a tractor load sensor, as shown in fig. 5 to 7, comprising a housing 101, wherein a first oil groove 112 and a second oil groove 113 are arranged in the housing; the first oil groove 112 and the second oil groove 113 communicate through a communication groove 114; the first oil groove is opened on the upper surface of the shell. In the present application, the shape of the casing is generally U-shaped, semicircular or horseshoe-shaped, and in other embodiments of the present application, the casing may also be in other shapes, such as a circle with a central through hole, and the shape of the specific casing does not affect the implementation of the technical solution of the present application. In the drawings of the application, the shape of the shell is considered from the aspects of convenient assembly, material saving and the like.

As shown in fig. 10 and 11, the wear-resistant piston 102 is movably disposed in the first oil groove, and the upper surface of the wear-resistant piston is higher than the upper surface of the housing, so that the wear-resistant piston can move up and down after being pressed when in use. The wear piston is shaped to fit the shape of the housing first and on the other hand to fit the kingpin.

At least one circle of sealing ring grooves 121 are formed in the side wall of the wear-resistant piston 102, and a sealing ring 107 is arranged in each sealing ring groove for sealing the wear-resistant piston with the side wall of the first oil groove.

As shown in fig. 8 to 9, the piezoelectric element 104 is provided on the lower surface of the case opposite to the second oil groove; the hydraulic oil arranged in the second oil groove realizes the effect on the piezoelectric element through pressing the lower surface of the piezoelectric element.

And an upper electrode 105 disposed between the upper surface of the piezoelectric element and the lower surface of the housing and connected to the line socket 103 through a wire.

And the lower electrode 106 is arranged on the lower surface of the piezoelectric element opposite to the upper electrode and is connected with the circuit interface through a lead. The line socket 103 is fixed to the housing 101.

The housing is provided with a mounting bolt hole 111 for passing a fixing bolt 400 to be fixed with the retractor.

The present application further provides a retractor assembly, as shown in fig. 12-16, comprising a retractor, a retractor pin, and a retractor load sensor of any of the above.

Compared with the retractor in the prior art, the retractor in the application has no structural change, the technical scheme of the application can be realized by adopting the retractor in the prior art, the retractor in the application also comprises other components such as a locking mechanism, an unlocking mechanism and the like, but because the structures are irrelevant to the technical scheme of the application, the specific structure of the retractor is not described and illustrated. The tractor is provided with a traction pin jack, and the opening part of the tractor load sensor and the traction pin jack are fixed on the tractor relatively.

As shown in fig. 12, the kingpin 300 is inserted into the kingpin receptacle through the opening of the retractor load sensor 100 and the kingpin is pressed against the wear piston upper surface of the retractor load sensor.

Threaded mounting holes are provided around the kingpin receptacles of the retractor 200, corresponding to mounting bolt holes on the housing of the retractor load sensor.

As shown in fig. 15, the towing pin 300 includes a first cylinder 301, a second cylinder 302, a third cylinder 303 and a fourth cylinder 304 in sequence from top to bottom.

The diameter of the first cylinder is larger than the diameters of the other three cylinders, the diameter of the third cylinder is the smallest, the traction pin is inserted into the traction pin insertion hole, the traction device load sensor is sleeved at the third cylinder, and the lower surface of the second cylinder is in compression joint with the upper surface of the wear-resistant piston.

The operation principle of the retractor load sensor is shown in fig. 17, the force applied by the traction pin 300 pressing on the wear-resistant piston 102 of the sensor is F1, the wear-resistant piston applies pressure to the hydraulic oil 500 in the oil groove under the action of the load of F1, and the pressure of the hydraulic oil is correspondingly transmitted to the surface of the piezoelectric element to form surface pressure F2 on the piezoelectric element.

According to the principle of a communicating vessel, F1/S1 is F2/S2, if S2 is greater than S1, F2 is less than F1, so that the size of the force borne by the surface of the piezoelectric element can be effectively reduced by adjusting the area ratio of the wear-resistant piston to the force-bearing surface of the piezoelectric element, and the aim of reducing the requirement on the mechanical bearing performance of the piezoelectric element material is fulfilled.

Meanwhile, along with the change of the load of the trailer, the load born by the tractor load sensor also correspondingly changes, so that a voltage signal which correspondingly changes is formed between the upper electrode and the lower electrode of the sensor, and the load born by the tractor can be reflected.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A tractor assembly, comprising a tractor, a traction pin and a tractor load sensor;

the traction pin is inserted into the traction pin insertion hole through the opening part of the tractor load sensor, and the traction pin is in compression joint with the upper surface of the wear-resistant piston of the tractor load sensor;

the tractor load sensor comprises a shell, wherein a first oil groove and a second oil groove are formed in the shell; the first oil groove is communicated with the second oil groove through a communicating groove; the first oil groove is opened on the upper surface of the shell;

the wear-resistant piston is movably arranged in the first oil groove, the upper surface of the wear-resistant piston is higher than the upper surface of the shell, and the wear-resistant piston moves up and down along the first oil groove;

a piezoelectric element disposed on an upper surface of the second oil groove;

the upper electrode is arranged between the upper surface of the piezoelectric element and the upper surface of the second oil groove and is connected with the line interface through a lead;

the lower electrode is arranged on the lower surface of the piezoelectric element opposite to the upper electrode and is connected with the circuit jack through a lead;

at least one circle of sealing ring grooves are formed in the side wall of the wear-resistant piston, and a sealing ring is arranged in each sealing ring groove;

2. The retractor assembly of claim 1 wherein said line interface is secured to said housing.

3. The retractor assembly of claim 1 wherein said housing is U-shaped or semi-circular, and wherein said first oil channel and said second oil channel are each shaped the same as or similar to said housing.

4. The retractor assembly of claim 1 wherein mounting bolt holes are provided in said housing.

5. The retractor assembly of claim 1 wherein threaded mounting holes are provided in the retractor at the periphery of the retractor pin receptacles corresponding to mounting bolt holes in the housing of the retractor load cell.