CN102756624A

CN102756624A - Pintle hook

Info

Publication number: CN102756624A
Application number: CN2012102600345A
Authority: CN
Inventors: 周天胜
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2012-07-25
Filing date: 2012-07-25
Publication date: 2012-10-31
Anticipated expiration: 2032-07-25
Also published as: CN102756624B

Abstract

The invention discloses a pintle hook, and belongs to the field of automobiles. The pintle hook comprises a trailing hook and a trailing nut, wherein a connecting thread is formed on the trailing hook; a connection hole is formed in the trailing nut, and comprises an internally threaded section which is in matched connection with the connecting thread and can accommodate the connecting thread; the trailing hook comprises a shoulder and a matching body; the matching body is connected with the connecting thread; the shoulder comprises a trailing hook end surface extending to form the matching body; a transitional region is arranged at the joint of the trailing hook end surface and the matching body; a withstanding surface propped against the trailing hook end surface is arranged at one end of the trailing nut; the connection hole further comprises a matching section and an externally threaded relief groove; the matching section can accommodate the matching body in a matched manner; and the externally threaded relief groove is used for protecting the trailing hook. The fixed end of the pintle hook is moved to the transitional region from the externally threaded relief groove, so as to reduce the bending stress and the shearing force of the externally threaded relief groove, avoid plastic deformation or fracture of the externally threaded relief groove, solve the problems of deformation and fracture of the pintle hook, and improve the safety and the reliability during the operation of the pintle hook.

Description

Car puller hook

Technical field

The present invention relates to automotive field, particularly a kind of car puller hook that is applicable to M1 class vehicle.

Background technology

Car puller hook on the M1 class vehicle generally is installed in the preceding bottom and the rear lower of vehicle, when vehicle breaks down, needs to use this car puller hook towing vehicle.The car puller hook that is applied at present on the M1 class vehicle mainly contains two kinds: a kind of is the welded type car puller hook, is that car puller hook directly is welded on preceding bottom of vehicle and rear lower, because the position of weld of this car puller hook is lower, the crossing ability of vehicle is relatively poor, less use.Another kind is a dismountable trailer hook; This dismountable trailer hook comprises towing hook and trailer nut, and the trailer nut is cemented on the vehicle body safety lever crossbeam, and towing hook is provided with outside thread; The trailer nut is provided with the outside thread bonded assembly negative thread with towing hook, is provided with relief groove at the externally threaded root of towing hook.

Yet according to the feedback of after market, existing dismountable trailer hook deforms and breakage problem in the trailer operation process easily.Particularly, car puller hook regard as an end fixedly the other end bear the cantilever beam of trailer power.The externally threaded relief groove place of the towing hook of existing car puller hook is the fixed end of cantilever beam; The flexure stress that bears on this situation theory is maximum; There is stress concentration in the design of this positional structure, so car puller hook very easily deforms from this position and rupture, and has a strong impact on the safe reliability of trailer operation.

Summary of the invention

In order to solve the problem that above-mentioned car puller hook deforms easily and ruptures in the trailer operation process, the embodiment of the invention provides a kind of car puller hook.Said technical scheme is following:

On the one hand, a kind of car puller hook is provided, it comprises towing hook and trailer nut; Towing hook is provided with connecting thread, and the trailer nut is provided with connecting bore, and connecting bore comprises the internal thread segment of holding and being connected with connecting thread; Towing hook comprises the shaft shoulder and ligand, and ligand is connected with connecting thread, and the shaft shoulder comprises a towing hook end face; Ligand is formed by the extension of towing hook end face, and the junction of towing hook end face and ligand is provided with a transition region; One end of trailer nut is provided with a face of replacing each other with the towing hook end face of keeping out; Connecting bore also comprises the cooperation section of holding and cooperating with ligand.

Further, ligand is cylindric or is coniform.

Further, the cross sectional shape of cooperation section and the shape of ligand are suitable, and cooperate the cross sectional shape of section to be cylindric or to be coniform.

Further, transition region is round table surface or circular conical surface.

Further, towing hook also comprises a towing hook body, one side vertical be connected relative with the towing hook end face of towing hook body and the shaft shoulder.

Further, the junction of connecting thread and ligand is provided with an outside thread relief groove.

Further, the trailer nut comprises nut body and is arranged on the nut convex shoulder at the first end place of nut body that the end face of first end of the outer face of nut convex shoulder and nut body is concordant, keeps out face with formation.

Further, connecting bore extends along the axle center of nut body, and runs through first end and second end of nut body.

Further, connecting bore also comprises the negative thread relief groove that is arranged on internal thread segment and the junction that cooperates section.

The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: overcome the problem that existing car puller hook deforms easily and ruptures in the trailer operation process.Particularly, car puller hook of the present invention passes through to protect the outside thread relief groove in the arc transition district of the junction of the ligand of towing hook and towing hook end face setting; And because ligand supports with the top of keeping out face with the contact structures and the towing hook end face of the section of cooperation of trailer nut; Make the fixed end of car puller hook from the position transfer of outside thread relief groove to the arc transition district; Thereby the flexure stress and the shearing force at outside thread relief groove place have been reduced; Avoided outside thread relief groove place to produce plastic deformation or fracture, to solve car puller hook distortion and breakage problem, the safe reliability when having improved the car puller hook operation.

Description of drawings

In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation of the car puller hook that provides of the embodiment of the invention;

Fig. 2 is the schematic perspective view of the towing hook of the car puller hook among Fig. 1;

Fig. 3 is the schematic top plan view of Fig. 2;

Fig. 4 is the schematic side view of Fig. 2;

Fig. 5 is the enlarged diagram that blocks of Fig. 4;

Fig. 6 is the schematic perspective view of the trailer nut of the car puller hook among Fig. 1; And

Fig. 7 is the cross-sectional schematic of Fig. 6.

The specific embodiment

For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.

Referring to Fig. 1, the embodiment of the invention provides a kind of car puller hook, it comprise towing hook 1 and with towing hook 1 bonded assembly trailer nut 2.Wherein, trailer nut 2 is captiveed joint with vehicle body (figure does not show), and preferred, trailer nut 2 is welded on the vehicle body; Towing hook 1 removably is connected on the trailer nut 2.

Please combine with reference to Fig. 2 to Fig. 5, towing hook 1 comprises towing hook body 11, the shaft shoulder 13, ligand 15 and and ligand 15 bonded assembly connecting threads 17.The shaft shoulder 13 is a towing hook end face 131 towards the one side of ligand 15, one side vertical be connected relative with towing hook end face 131 of towing hook body 11 and the shaft shoulder 13.Ligand 15 is formed by these towing hook end face 131 vertical extent.Ligand 15 is cylindric, perhaps preferably is coniform.Junction with towing hook end face 131 on the ligand 15 is provided with a transition region 151, and this transition region 151 is round table surface or circular conical surface.The end relative that connecting thread 17 is connected ligand 15 with the shaft shoulder 13, and the junction of connecting thread 17 and ligand 15 is provided with an outside thread relief groove 171.

Please combine with reference to Fig. 6 and Fig. 7, trailer nut 2 comprises nut body 21 and is arranged on the nut convex shoulder 23 at the first end place of nut body 21.The end face of first end of the outer face of nut convex shoulder 23 and nut body 21 is concordant, keeps out face 231 thereby form one.Nut body 21 is provided with one along the place, axle center and runs through first end of this nut body 21 and the connecting bore 25 of second end.Connecting bore 25 comprises internal thread segment 251, cooperates section 253 and is arranged on internal thread segment 251 and cooperate the negative thread relief groove 255 of the junction of section 253.Wherein, cooperate section 253, be used to hold ligand 15 near the face of keeping out 231.The cross sectional shape of cooperation section 253 and the shape of ligand 15 are suitable, are cylindric, perhaps preferably are coniform.Preferably, for easy to assembly, cooperate section 253 and the junction of keeping out face 231 to be provided with one section bevelled load segment 257.

Please once more with reference to Fig. 1, when needs used car puller hook of the present invention, the connecting bore 25 of the connecting thread 17 of towing hook 1 being aimed at trailer nuts 2 screwed in, and fully contacted and compressed with the face of keeping out 231 of trailer nut 2 until the towing hook end face 131 of towing hook 1.At this moment, connecting thread 17 screws togather with the internal thread segment 251 of trailer nut 2; The ligand 15 of towing hook 1 cooperatively interacts with the section of cooperation 253 of trailer nut 2 and replaces.And because the contact structures of ligand 15 and the section of cooperation 253 of trailer nut 2 and towing hook end face 131 and the top of keeping out face 231 support, make the fixed end of car puller hook from the position transfer of outside thread relief groove 171 to arc transition district 151.When outside thread relief groove 171 receives external impacts; Outside thread relief groove 171 suffered radial components will be transferred to the arc transition district 151 of the junction of ligand 15 and towing hook end face 131; And there is not stress concentration in these 151 places, arc transition district; And small elastic deformation can only take place in outside thread relief groove 171 at this moment, plastic deformation or fracture can not take place, the safe reliability when having improved the car puller hook operation.

In the time need not using car puller hook of the present invention, can towing hook 1 be revolved from trailer nut 2 and release, and towing hook 1 is packed up; Promptly guaranteed the attractive in appearance of vehicle, guaranteed that again vehicle does not receive the influence of towing hook 1 when collision, increased anterior crushed areas; Energy absorbing is more, and is highly beneficial to passenger protection.

Can know by above-mentioned narration: car puller hook of the present invention, through in the ligand 15 of towing hook 1 and the arc transition district 151 of the junction setting of towing hook end face 131, protect outside thread relief groove 171; And because ligand 15 supports with the top of keeping out face 231 with the section of cooperation 253 contact structures and the towing hook end face 131 of trailer nut 2; Make the fixed end of car puller hook from the position transfer of outside thread relief groove 171 to arc transition district 151; Thereby the flexure stress and the shearing force at outside thread relief groove 171 places have been reduced; Avoided outside thread relief groove 171 places to produce plastic deformation or fracture, to solve car puller hook distortion and breakage problem.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. car puller hook; It comprises towing hook (1) and trailer nut (2); Said towing hook (1) is provided with connecting thread (17); Said trailer nut (2) is provided with connecting bore (25), and said connecting bore (25) comprise hold and with the internal thread segment (251) that said connecting thread (17) is connected, it is characterized in that:

Said towing hook (1) comprises the shaft shoulder (13) and ligand (15); Said ligand (15) is connected with said connecting thread (17); The said shaft shoulder (13) comprises a towing hook end face (131); Said ligand (15) is formed by towing hook end face (131) extension, and the junction of said towing hook end face (131) and said ligand (15) is provided with a transition region (151);

One end of said trailer nut (2) is provided with a face of replacing each other with said towing hook end face (131) of keeping out (231);

Said connecting bore (25) also comprises the cooperation section (253) of holding and cooperating with said ligand (15).

2. car puller hook according to claim 1 is characterized in that, said ligand (15) is cylindric or is coniform.

3. car puller hook according to claim 2 is characterized in that, the cross sectional shape of said cooperation section (253) and the shape of said ligand (15) are suitable, and the said cross sectional shape of section (253) that cooperates is cylindric or is coniform.

4. car puller hook according to claim 1 is characterized in that, said transition region (15) is round table surface or circular conical surface.

5. car puller hook according to claim 1 is characterized in that, said towing hook (1) also comprises a towing hook body (11), one side vertical be connected relative with said towing hook end face (131) of said towing hook body (11) and the said shaft shoulder (13).

6. car puller hook according to claim 5 is characterized in that, the junction of said connecting thread (17) and said ligand (15) is provided with an outside thread relief groove (171).

7. car puller hook according to claim 1; It is characterized in that; Said trailer nut (2) comprises nut body (21) and is arranged on the nut convex shoulder (23) at the first end place of said nut body (21); The outer face of said nut convex shoulder (23) is concordant with the end face of first end of said nut body (21), to form the said face (231) of keeping out.

8. car puller hook according to claim 7 is characterized in that, said connecting bore (25) extends along the axle center of said nut body (21), and runs through first end and second end of said nut body (21).

9. car puller hook according to claim 7 is characterized in that, said connecting bore (25) also comprises the negative thread relief groove (255) of the junction that is arranged on said internal thread segment (251) and said cooperation section (253).