CN2821169Y

CN2821169Y - General gasoline engine start pressure unloading device

Info

Publication number: CN2821169Y
Application number: CN 200520009480
Authority: CN
Inventors: 杜江; 龙远翔
Original assignee: XIANGLIN AUTOMOBILE FITTINGS CO Ltd CHONGQING
Current assignee: CHONGQING XIANGLING AUTO PARTS CO., LTD.
Priority date: 2005-06-15
Filing date: 2005-06-15
Publication date: 2006-09-27
Anticipated expiration: 2015-06-15

Abstract

The utility model relates to a general gasoline engine start pressure unloading device which comprises a cam shaft, a gear, a centrifugal arm, and an elastic resetting device, wherein the elastic resetting device is arranged between the gear and the centrifugal arm. The utility model is characterized in that the middle part of the centrifugal arm is hinged with the cam shaft through a shaft pin or a rivet; the centrifugal arm uses the hinging position as a boundary, one side is provided with a pressure reducing block, and the other side is provided with a matching block; the end head of the pressure reducing block is corresponding to the position of a base circle of a cam. The utility model has the advantages of simple structure, few parts, simple assembly technique, etc.

Description

General gasoline engines starts pressure relief device

(1), affiliated technical field

The utility model relates to the accessory on a kind of general gasoline engines, and particularly a kind of general gasoline engines starts the release device.

(2), technical background

Generally before startup, its valve is to be in open mode to general gasoline engines, and behind gasoline engine starting, its valve need be closed storage and be pressed.The utility model patent that a kind of name is called " general gasoline engines startup pressure relief device " is disclosed in CN2628732Y, it includes camshaft, centrifuge arm and Returnning spring between the two, shift fork by the axle rotational fixation on camshaft, the straight trough that cooperates with locating stud is arranged on centrifuge arm, the centrifuge arm upper end is heavier than lower end quality, shifting block on the shift fork is stuck in the bayonet socket of centrifuge arm, and the jacking block that backs down the petrol engine valve is arranged on the shift fork.Because the centrifuge arm of this startup pressure relief device is two parts that separate with the decompression shift fork, and separately around the axle rotation of oneself, therefore, structure is complicated, part is many and assembly technology is complicated.

(3), summary of the invention

The purpose of this utility model just provides a kind of general gasoline engines simple in structure, that component are few and easy to assembly and starts pressure relief device.

The purpose of this utility model is to realize by such technological scheme, it includes camshaft, gear, centrifuge arm and elasticity reset device between the two, it is characterized in that: it is hinged that pivot pin or rivet and camshaft are passed through in the middle part of centrifuge arm, centrifuge arm is the boundary with the hinged place, be the decompression piece first, another then is a balancing weight, and the termination of decompression piece is corresponding with the position of cam base circle.

The utility model is behind gasoline engine starting, because the rotation of camshaft, centrifuge arm is under the effect of centripetal acceleration, generation departs from the effect of inertia of rotating center, overcome the pulling force of elasticity reset device and rotate, the decompression piece on the centrifuge arm is rotated away from cam base circle with centrifuge arm, valve-closing; When the rotation of camshaft was lower than certain rotating speed, the pulling force of elasticity reset device resetted centrifuge arm, and the decompression piece is higher than cam base circle valve is backed down, and made the flame-out shutdown of petrol engine.The utility model substitutes centrifuge arm of the prior art, two parts of decompression piece with this part of centrifuge arm, has few, the simple in structure and assembling characteristic of simple of part.

Owing to adopted technique scheme, the utlity model has advantages such as simple in structure, that part is few and assembly technology is simple.

(4), description of drawings

Description of drawings of the present utility model is as follows:

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

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

Among the figure: 1. camshaft; 2. centrifuge arm; 3. elasticity reset device; 4. decompression piece; 5. balancing weight; 6. cam base circle; 7. pivot pin or rivet; 8. cambered surface; 9. gear; 10. yielding hole.

(5), embodiment

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

As shown in Figure 1, 2, the utility model includes camshaft 1, gear 9, centrifuge arm 2 and elasticity reset device between the two 3, it is characterized in that: the middle part of centrifuge arm is hinged with camshaft 1 by pivot pin or rivet 7, centrifuge arm 2 is the boundary with the hinged place, be decompression piece 4 first, another then is a balancing weight 5, and the termination of decompression piece 4 is corresponding with the position of cam base circle 6.

When camshaft was in halted state, because the effect of elasticity reset device makes centrifuge arm remain on the home position, the decompression piece was higher than cam base circle, valve is backed down, thereby play the purpose of release when starting.In the start-up course of petrol engine, when camshaft speed reaches the technical requirements value,, make centrifuge arm overcome the pulling force of elasticity reset device and rotate because the effect of centripetal acceleration can produce the effect of inertia that departs from rotating center.Decompression piece on the centrifuge arm also moves thereupon, returns in the circumference of cam base circle valve-closing.Make motion that valve gives by cam curve and proper functioning.

As shown in Figure 1, work more reliably in order to make centrifuge arm, gear 9 is provided with the yielding hole 10 of balancing weight 5 turnover of being convenient on the centrifuge arm 2, and balancing weight 5 is arranged in makes a concession hole 10.

As shown in Figure 2, elasticity reset device 3 is to be made of a torsion spring, and torsion spring is placed on pivot pin or the rivet 7, and torsion spring one end is against on the centrifuge arm 2, and the other end is against on the gear 9.

As shown in Figure 2, for piece 4 ends that prevent to reduce pressure scratch the parts that it contacts, decompression piece 4 outers of centrifuge arm 2 are and the corresponding cambered surface 8 of the circumference of cam base circle 6.

Claims

1. a general gasoline engines starts pressure relief device, include camshaft (1), gear (9), centrifuge arm (2) and elasticity reset device between the two (3), it is characterized in that: the middle part of centrifuge arm is hinged with camshaft (1) by pivot pin or rivet (7), centrifuge arm (2) is the boundary with the hinged place, be decompression piece (4) first, another then is a balancing weight (5), and the termination of decompression piece (4) is corresponding with the position of cam base circle (6).

2. general gasoline engines as claimed in claim 1 starts pressure relief device, it is characterized in that: gear (9) is provided with the yielding hole (10) of balancing weight (5) turnover of being convenient on the centrifuge arm (2), and balancing weight (5) is arranged in makes a concession hole (10).

3. general gasoline engines as claimed in claim 1 starts pressure relief device, and it is characterized in that: elasticity reset device (3) is to be made of a torsion spring, and torsion spring is placed on pivot pin or the rivet (7), and torsion spring one end is against on the centrifuge arm (2), and the other end is against on the gear (9).

4. start pressure relief device as claim 1,2 or 3 described general gasoline engines, it is characterized in that: decompression piece (4) outer of centrifuge arm (2) is the corresponding cambered surface of circumference (8) with cam base circle (6).