CN101963174B - Plastic part fit tolerance compensation structure - Google Patents

Abstract

The invention discloses a plastic part fit tolerance compensation structure, which belongs to the technical field of plastic parts. The plastic part fit tolerance compensation structure comprises a first plastic part and a second plastic part, wherein a circuit board or other parts can be arranged between the first plastic part and the second plastic part; the first plastic part is in fit connection with the second plastic part through a bayonet and a hook; and the bayonet and the hook adopt no clearance fit. The plastic part fit tolerance compensation structure has the advantages of simple mechanical structure, low production cost and capacity of effectively solving the problem of assembling chucking between the plastic parts.

Description

Fit tolerance collocation structure between the plastic part

Technical field

What the present invention relates to is a kind of tolerance compensating structure of plastics Component technical field, fit tolerance collocation structure between particularly a kind of plastic part.

Background technique

Existing plastic part cooperating structure typically refers to two plastic parts and is assembled to one soon, and perhaps two plastics semi-finished product are assembled to a fast mounting structure.This structure is usually directed to two assemblings between the plastic part, and the common assembling between perhaps several plastic parts relates to the assembling of non-plastic parts such as PCB between perhaps plastic part cooperates.

Connect between plastic part and use buckle structure, have the bit-stopping structure that cooperates between two plastic parts simultaneously, thereby reach the mount effect.Because the plastic part manufacturing is accomplished through mould, injection moulding usually; All there is manufacturing tolerances in the size of bayonet socket and trip; So in design, will consider, can have the problem of incomplete chucking like this to assembly process leaves gap (otherwise can run into the problem that can't assemble).The existence in this gap causes after the assembling, exists between the part of cooperation and rocks relatively, if mating parts relates to realization function parts such as PCB, then can cause functional lability; If the part that relates to is to be applied on the sports products such as automobile,, even cause the fatigue ruption of part then in use because vibration produces noise.

Solve as above problem, often adopt dual mode.One adopts screw to connect, and two adopt buckle to connect, and stop surface adopts the conquassation muscle to cooperate.But; Screw connects and has some problems all the time: at first need on the cooperation plastic part, leave screw hole location, take certain space, next uses screw to increase Material Cost; Thereby the increase product cost, moreover use screw to increase installation time and assembly cost.Stop surface uses the conquassation muscle to cooperate same some problems that exist: at first the plastic materials kind is a lot; In the time of design, need the amount of conquassation to be difficult to hold, the dynamics that secondly press-fits in the assembly process is difficult to hold; If overvoltage will take place to have intermittent problem after the above-mentioned assembling.

Summary of the invention

The objective of the invention is to overcome the shortcoming that said structure exists, fit tolerance collocation structure between a kind of plastic part is provided.Mechanical structure of the present invention is simple, and cost of production is low, effectively solves the tolerance compensating structure of assembling chucking problem between the plastic part.

The present invention realizes through following technological scheme:

The present invention includes first plastic part, second plastic part; Between first plastic part and second plastic part, can be provided with circuit board or other parts; Being connected through bayonet socket and trip between said first plastic part and second plastic part; For no gap cooperates, the bottom surface of said trip does not have a hectare angle between said bayonet socket and the trip.

There is the assembling directional post in the cooperation of described bayonet socket and trip on said first plastic part, have the assembling pilot hole on second plastic part, and in the assembly process, directional post contacts with the pilot hole cooperation.

Be provided with on said first plastic part and be fixed with stop surface; Said second plastic part is provided with the elasticity stop surface; When fixedly stop surface and elasticity stop surface were interference fit, described elasticity stop surface was designed to overhang shape or and rack beams shape and structure form.

There is groove in said elasticity stop surface structure near the fulcrum place.

Beneficial effect of the present invention is: for no gap cooperates, have certain magnitude of interference between stop surface place first plastic part and second plastic part between bayonet socket of the present invention and the trip.Elasticity stop surface structure increases elasticity stop surface structural elasticity near the groove at fulcrum place, eliminates internal stress.Cooperate between directional post on the plastic part and the pilot hole and be Spielpassung.In assembly process,, guaranteed the correct rigging position of trip and bayonet socket because directional post preferentially contacts with pilot hole.After the stop surface contact, because the effect of Elastic Contact face guarantees that buckle structure is seated.After the assembling, the resilient force owing to the elasticity bit-stopping structure has guaranteed that trip and bayonet fittings face are adjacent to, thereby can eliminate matching gap fully that making does not have relative movement between the mating parts, and it is firm to assemble.This project organization is simple, need not increase any other part, need not increase extra cost, and assembling rapidly, and assembly technology is simple, saves installation time.

Description of drawings

Fig. 1 is two plastic part fit tolerances of present embodiment collocation structure schematic representation;

Fig. 2 is a present embodiment rack beams elastic structure schematic representation;

Fig. 3 is a present embodiment overhang elastic structure schematic representation;

Fig. 4 is a present embodiment guide structure schematic representation.

Among the figure: first plastic part-20, second plastic part-21, bayonet socket-22, grab-23, elasticity bit-stopping structure-24, rack beams-25, overhang-26, groove-27, pilot hole-28, directional post-29.

Embodiment

Below in conjunction with accompanying drawing embodiments of the invention are elaborated, present embodiment provided detailed mode of execution and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technological scheme of the present invention.

As shown in Figure 1; The tolerance compensating structure that two plastic parts of the present invention cooperate, it comprises first plastic part 20 and second plastic part 21, on first plastic part 20, is provided with bayonet socket 22; Second plastic part 21 is provided with grab 23; Bayonet socket 22 is a seamless connectivity with grab 23, cooperates on stop surface place second plastic part 21 at two plastic parts to be provided with elastic structure 24, like Fig. 2, shown in 3; The cooperation of stop surface place is interference fit when design, and elasticity is ended structure 24 and is designed to overhang shape 25 or and rack beams shape 26 structural types.Be provided with groove 27 at elasticity bit-stopping structure 24 roots, as shown in Figure 4, first plastic part 20 is provided with pilot hole 28, on second plastic part 21, is provided with directional post 29.

In assembly process; Directional post 29 contacts earlier with pilot hole 289; Guarantee that two plastic part rigging positions are correct, bayonet socket 22 contacts with grab 23 more then, when first plastic part, 20 upper position-arresting faces touch the elasticity bit-stopping structure 24 on second plastic part 21; Bayonet socket 22 is connected also with grab 23 and is not seated; Continue to be assembled to bayonet socket 22 and be connected with grab 23 and put in place, at this moment elasticity bit-stopping structure 24 has had certain deformation, and the elastic force that this distortion produces closely is combined together two plastic parts.Groove 27 plays the increase structural elasticity, the effect of unloading internal stress.

The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (1)

1. fit tolerance collocation structure between the plastic part; It is characterized in that; Comprise first plastic part, second plastic part; Between first plastic part and second plastic part, be provided with circuit board or other parts, through being connected of bayonet socket and trip, be the cooperation of no gap between said bayonet socket and the trip between said first plastic part and second plastic part;

Have the assembling directional post on said first plastic part, have the assembling pilot hole on second plastic part, in the assembly process, directional post contacts with the pilot hole cooperation;

Said first plastic part is provided with fixedly stop surface, and said second plastic part is provided with the elasticity stop surface, and when fixedly stop surface and elasticity stop surface were interference fit, the elasticity stop surface was designed to overhang or rack beams structural type;

There is groove in said elasticity stop surface structure near the fulcrum place.

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