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Semitrailer support

A semi-trailer and nut technology, which is used in vehicle maintenance, lifting vehicle accessories, transportation and packaging, etc., can solve the problem of increased thread bending moment and shear force, reduced lifting capacity of outriggers, screw rod and nut stuck, etc. problems, achieve the effect of reducing wall thickness, reducing production cost and increasing lifting capacity

Inactive Publication Date: 2008-04-30
GUANGDONG FUWA ENG MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the screw nut of this structure encounters an uneven semi-trailer, the screw can still move freely in the nut and will not be stuck by the nut. However, since the screw nut is a single-layer structure, when it rotates after loading, Only the two corners of the single layer are in contact with the inner wall of the square tube, and the other parts of the nut are suspended (or held in the air), which is prone to vibration and unstable work. Since the axes of the screw and the nut do not coincide, the screw that the screw nut is effectively engaged with The number of teeth is reduced, and the bending moment and shear force of the thread are increased. It has been proved by practice that the thread is easy to deform, causing the screw rod and the nut to be stuck, reducing the lifting capacity of the leg, and directly affecting its service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0029] Referring to Fig. 1-Fig. 6, the first nut in the outrigger of the semi-trailer is a square structure of upper and lower layers, and a first reinforcing rib 2 is arranged between the upper layer 1 and the lower layer 3. The threaded hole 4 is set in the center, the upper layer 1 of the first nut is provided with a transition slope 1.1, the first oil storage groove 1.2 is located in the center of the transition slope, the first oil storage groove is funnel-shaped, the first oil storage groove and the screw thread Holes 4 communicate with each other; the first reinforcing ribs are four, in the shape of a right triangle, evenly distributed in the circumferential direction, facing the four cut corners, one of the right-angled sides is connected with the lower layer of the first nut, and the other right-angled side is connected with the middle cylinder of the first nut Body connected. The first nut is arranged in the square pipe 8, and its four corners are respectively provid...

no. 2 example

[0032] Referring to Fig. 7-Fig. 10, the second reinforcing rib 23 is a quadrangle, its top edge and the bottom of the upper layer 21 of the second nut join, its bottom edge and the bottom layer 22 top of the second nut join, and its inner side is connected to the second nut. The cylindrical sections in the middle of the nut meet. The second nut is arranged in the square tube 8 of the inner leg, and its four corners are provided with circular arcs. There are eight second reinforcing ribs 23, which are uniformly distributed in the circumferential direction, and wherein, four second reinforcing ribs are facing the four circular arcs.

[0033] See the first embodiment for the rest of the undescribed parts, and will not repeat them here.

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Abstract

A leg of semi-trailer comprises an inner leg which can extend up and down, and an outer leg fixed at two sides of the front portion of semi-trailer, wherein the inner and outer legs are connected via a lead screw and a nut, a screw hole at center of the nut is communicated with an oil groove at upper portion, the nut is square with at least two layers arranged with strengthening ribs between, the upper layer of the nut is provided with a transition slope at center of which the oil groove in bucket shape is arranged, the strengthening rib is triangle, of which one edge is connected with the lower layer of the nut and another edge is connected with the middle of the nut. The invention sets the nut as square with at least two layers, to keep working stability of the nut and improve rotation torque resistance, thereby improving the lifting ability of the leg, and the invention sets the strengthening ribs to reduce the thickness of lower layer and middle cylinder, reduce nut weight, and keep the strength and rigidity of the nut, thereby prolonging the service life of the leg.

Description

technical field [0001] The invention relates to a semi-trailer, in particular to a semi-trailer outrigger. Background technique [0002] There are usually movable outriggers under the left and right side beams of the chassis of the semi-trailer to help support the semi-trailer when loading and unloading goods or parking for maintenance, and the height of the semi-trailer can be adjusted according to the actual height of the fifth wheel of various tractors. These movable outriggers should generally be retracted during the driving of the semi-trailer, so as to reliably prevent the movable outriggers from contacting the ground and causing safety accidents. [0003] Our company discloses a semi-trailer support device in Chinese Patent Document No. CN2384840Y, which includes left and right outriggers and their intermediate connecting shafts that can be installed on the front end of the semi-trailer, and a two-speed gear transmission mechanism, which is characterized in that the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60S9/06
Inventor 吴志强曾少凡钟向勇
Owner GUANGDONG FUWA ENG MFG CO LTD
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