CN201187359Y - Small discharge micro-vehicle engine piston - Google Patents

Abstract

The utility model discloses an engine piston used for a small-displacement mini vehicle, which comprises a head part and a skirt part. The head part is positioned above the skirt part. A annular groove is formed on the circumference of the head part. The skirt part is formed by enclosing two arc-shaped surfaces in the symmetrical arrangement with two flat surfaces in the symmetrical arrangement, wherein the arc-shaped surfaces and the flat surfaces are arranged alternately. Piston pin holes are formed in the opposite positions of the two flat surfaces. Pin holders are arranged on the inner side of the piston pin holes. The piston pin holes penetrate the corresponding pin holders. The engine piston reduces the weight of the piston assembly by changing the structure of the skirt part of the piston, effectively reduces the inertial force and the frictional loss of the piston during the operation, increases the efficiency of the piston assembly and the whole machine, and has the characterizes of novel design, easy operation, good reliability, etc.

Description

The little car engine piston of little discharge capacity

Technical field

The utility model relates to a kind of automotive engine component, relates in particular to the little car engine piston of little discharge capacity.

Background technique

Engine piston is the vitals of float amount minicar engine.Traditional engine piston is made up of head and skirt section, is provided with the firing chamber on the end face of piston crown, offers annular groove on the circumference of piston crown.The piston skirt is round, offers the wrist pin mounting hole at the opposite side of piston skirt, and the inboard of each wrist pin mounting hole has key seat, and the key seat top is connected with stiffening rib.The conventional engines piston mainly has the following disadvantages:

1, the piston skirt is round, makes wrist pin longer, and the weight of whole piston assembly is bigger, and inertial force and frictional loss when turning round like this are big, and the efficient of component and complete machine and functional reliability are all poor.

2, the firing chamber of piston crown is more shallow, generally has only about 2mm, is unfavorable for the tissue and the heat radiation of combustion-gas flow.

3, there are three stiffening ribs at the key seat place, and stress is concentrated, and insufficient strength makes key seat fragile, does not ensure the working life of whole piston.

The model utility content

Technical problem to be solved in the utility model is to provide a kind of little car engine piston of little discharge capacity that can effectively reduce running inertial force and frictional loss.

The technical solution of the utility model is as follows: the little car engine piston of a kind of little discharge capacity, comprise head and skirt section, head is positioned at the top in skirt section, on the end face of head, be provided with the firing chamber, offer annular groove on the circumference of head, its key is: described skirt section is surrounded by two symmetrically arranged arc surfaces and two symmetrically arranged planes and is formed, described arc surface and plane are arranged at interval, relative position on described two planes offers piston pin hole, the inboard of this piston pin hole has key seat, and described piston pin hole connects the key seat of correspondence.

Adopt above technological scheme, the piston skirt is by the original round side bar type that changes into, be that the skirt section is made up of two arc surfaces and two planes of paired setting, distance between two planes is less than the diameter of arc surface, piston pin hole on two planes is installed for wrist pin, the length of wrist pin is shorter than conventional construction like this, add side bar type skirt section structure, help alleviating the weight of piston assembly, thereby inertial force when reducing piston operation and frictional loss are to improve the functional reliability of piston assembly and complete machine.

Above-mentioned firing chamber is a dell shape, and the degree of depth is 4～6mm.Dell shape firing chamber helps combustion-gas flow tissue and heat radiation, has not only increased power but also reduced discharging.

Above above-mentioned key seat, be connected with two stiffening ribs, reduced the stress at key seat place like this and concentrated, promoted the intensity with the wrist pin joint, improved the reliability of piston.

Beneficial effect: the utility model alleviates the weight of piston assembly by the structure that changes the piston skirt, inertial force when having effectively reduced piston operation and frictional loss, improved the efficient of piston assembly and complete machine, have be skillfully constructed, implement easily, characteristics such as good reliability.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the A-A sectional view of Fig. 1.

Fig. 3 is the worm's eye view of Fig. 1.

Fig. 4 is the B-B sectional view of Fig. 3.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the little car engine piston of little discharge capacity is made up of head 1 and skirt section 2, and wherein head 1 is positioned at the top in skirt section 2, and both are structure as a whole.Offer firing chamber 1a on the end face of head 1, this firing chamber 1a is a dell shape, and the degree of depth is 4～6mm, helping combustion-gas flow tissue and heat radiation, and increases power, reduces discharging.On the circumference of head 1, also offer a plurality of annular groove 1b, install for piston ring.Described skirt section 2 is the side bar type, surround by two symmetrically arranged arc surface 2a and two symmetrically arranged plane 2b and to form, described arc surface 2a and plane 2b arrange at interval, distance between the two plane 2b is less than the diameter of arc surface 2a, inwall at described plane 2b is formed with key seat 2d, the top of key seat 2d is connected with two stiffening rib 2e, concentrates with the stress that reduces key seat 2d place, has promoted the intensity with the wrist pin joint.The relative position of described two plane 2b offers piston pin hole 2c, and this piston pin hole 2c connects the key seat 2d of correspondence.Because the distance between the two plane 2b is less than the diameter of arc surface 2a, the length of wrist pin is shorter than conventional construction like this, add side bar type skirt section structure, help alleviating the weight of piston assembly, thereby inertial force when reducing piston operation and frictional loss have improved the efficient and the functional reliability of piston assembly and complete machine.In the utility model part such as oil duct be provided with same as the prior artly, do not do at this and to give unnecessary details.

Claims (3)

1. A piston of a small-displacement micro-car engine, comprising a head (1) and a skirt (2), the head (1) is positioned above the skirt (2), and a top surface of the head (1) is provided with A combustion chamber (1a) is arranged, and an annular groove (1b) is opened on the circumference of the head, and it is characterized in that: the skirt (2) is composed of two symmetrically arranged arc surfaces (2a) and two symmetrically arranged planes ( 2b) is enclosed, the arc surface (2a) and the plane (2b) are arranged at intervals, and a piston pin hole (2c) is opened at the relative position of the two planes (2b), and the piston pin hole (2c) The inner side has a pin seat (2d), and the piston pin hole (2c) penetrates the corresponding pin seat (2d). 2. The small-displacement micro-car engine piston according to claim 1, characterized in that: the combustion chamber (1a) is in the shape of a deep pit with a depth of 4-6 mm. 3. The small-displacement micro-car engine piston according to claim 2, characterized in that two reinforcing ribs (2e) are connected above the pin seat (2d).

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