CN201401239Y

CN201401239Y - Cylinder head cover

Info

Publication number: CN201401239Y
Application number: CN2008201006378U
Authority: CN
Inventors: 裴智
Original assignee: Chongqing Zongshen General Power Machine Co Ltd
Current assignee: Chongqing Zongshen General Power Machine Co Ltd
Priority date: 2008-11-20
Filing date: 2008-11-20
Publication date: 2010-02-10
Anticipated expiration: 2018-11-20

Abstract

The utility model relates to a cylinder head cover which comprises an outer cover (1), a breathing valve (2) and an inner cover (4). The key points are that the orthographic projection of the breathing valve (2) has the shape of combination of a rectangle (2-1) and a semicircle (2-2). With good flexibility, the breathing valve of the cylinder head cover can be easily opened even when the pressureinside an engine body is positive, thereby greatly reducing the oil leakage risk of sealed parts of the engine body and ensuring good air tightness between the inner cover and the outer cover.

Description

A kind of cylinder skull

Technical field

The utility model relates to a kind of general purpose engine cylinder skull, particularly relates to a kind of cylinder skull of single-cylinder engine.

Background technique

The cylinder skull of existing general purpose engine generally comprises cylinder head cover housing, cylinder skull inner cap, breathing valve block block, cylinder skull respirating tube, breathes valve block and breathe the valve block pressing plate, but such cylinder skull intensity is relatively poor; Simultaneously, because the elasticity of breathing valve block is less, when engine housing inside is malleation, breathes valve block and be not easy to open, thereby cause the casing leakage of oil; In addition, the tightness between inner cap and enclosing cover is also poor.

The model utility content

The purpose of this utility model is to provide a kind of sealing strong, on-deformable cylinder skull.

The purpose of this utility model is achieved through the following technical solutions: a kind of cylinder skull, and comprise enclosing cover, breathe valve block, it is characterized in that: the orthographic projection of described breathing valve block is rectangle and semicircular combination shape.

Described semicircular diameter preferably equals the wide of described rectangle.

The best circular arc in the corner of described rectangle is excessive.

The length of described breathing valve block is preferably 30 ~ 45mm.

For further strengthening the sealability of cylinder head, reduce the leakage of machine oil, also increase the intensity of cylinder head simultaneously, described outer covering also is provided with stiffening rib.

Described stiffening rib be preferably be arranged on described enclosing cover the bottom to the reciprocal projection of the inner chamber of described enclosing cover.

Further, described stiffening rib is preferably along the circumferential setting of the dished cover of described enclosing cover.

Owing to be subjected to the enclosing cover size restrictions, described outer cover best dished cover along described enclosing cover the described stiffening rib of a circle circumferentially is set.

For improving the tightness of enclosing cover and inner cap, between described enclosing cover and described inner cap, be provided with seal ring.

Described seal ring is preferably " O " shape seal ring.

The beneficial effects of the utility model are:

(1) because the orthographic projection of described breathing valve block is rectangle and semicircular combination shape, therefore breathing valve block, to compare the elasticity of breathing valve block of existing Pear Shaped better, therefore when engine housing inside is malleation, breathe valve block and also can be easy to open, thereby engine interior gas is flowed out from inner cap inhalation valve film perforation;

(2) because described semicircular diameter equals the wide of described rectangle, therefore breathe that valve block is more convenient to be installed in the cylinder skull, and easily manufactured;

(3) because the best circular arc in corner of described rectangle is excessive, the therefore installation that is more suitable for breathing valve block;

(4) because the length of described breathing valve block is preferably 30 ~ 45mm, the elasticity of therefore breathing valve block is better, thereby makes opening of breathing valve block easier;

(5) because described outer covering also is provided with stiffening rib, so the sealability of cylinder head is better, thereby has avoided machine oil to reveal from cylinder head cover, has also increased the intensity of cylinder head cover simultaneously, and the distortion of cylinder head cover is reduced, and then the leakage that makes machine oil still less;

(6) since described stiffening rib be preferably be arranged on described enclosing cover the bottom to the reciprocal projection of the inner chamber of described enclosing cover, so the manufacturing of stiffening rib is more convenient;

(7) because described stiffening rib is preferably along the circumferential setting of the dished cover of described enclosing cover, therefore can further increase the intensity of cylinder skull;

(8) since described outer cover best dished cover along described enclosing cover the described stiffening rib of a circle circumferentially is set, therefore under the prerequisite that guarantees cylinder skull intensity, manufacture cost is lower;

(9) owing between described enclosing cover and described inner cap, be provided with seal ring, therefore improved the tightness of enclosing cover and inner cap;

(10), therefore can further improve the tightness of enclosing cover and inner cap because described seal ring is preferably " O " shape seal ring.

Description of drawings

Fig. 1 is the utility model embodiment 1 a structural representation;

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

Fig. 3 is the B-B cutaway view Amplified image of Fig. 2;

Fig. 4 is the structural representation of parts 2 among Fig. 3;

Fig. 5 is the structural representation of parts 1 among Fig. 2;

Fig. 6 is the partial enlarged drawing of Fig. 5;

Fig. 7 is that the C of Fig. 5 is to view.

Embodiment

Embodiment 1: extremely shown in Figure 5 as Fig. 1, a kind of cylinder skull, comprise enclosing cover 1, breathe valve block 2 and inner cap 4, the orthographic projection of described breathing valve block 2 is the combination shape of rectangle 2-1 and semicircle 2-2, the diameter of described semicircle 2-2 equals the wide of described rectangle 2-1, and the corner circular arc of described rectangle 2-1 is excessive; The long 35mm of described rectangle 2-1, wide 15mm, the length of breathing valve block 2 is 30 ~ 45mm; The dished cover 1-3 of the described enclosing cover in 1-1 upper edge, bottom of described enclosing cover 1 circumferentially be provided with one the circle stiffening rib 3, described stiffening rib 3 is to the reciprocal projection of the inner chamber 1-2 of described enclosing cover 1; Between described enclosing cover 1 and described inner cap 4, be provided with " O " shape seal ring 5.

When engine housing inside is malleation, to breathe valve block 2 and open, engine interior gas goes out from the orifice flow on inner cap 4, the breathing valve block 2; When casing is negative pressure, breathe valve block 2 and close, make the inner machine oil of the gentle cylinder head cover of machine oil in the cylinder head flow back to casing.

Claims

1, a kind of cylinder skull comprises enclosing cover (1), breathes valve block (2) and inner cap (4), it is characterized in that: the orthographic projection of described breathing valve block (2) is the combination shape of rectangle (2-1) and semicircle (2-2).

2, cylinder skull as claimed in claim 1 is characterized in that: the diameter of described semicircle (2-2) equals the wide of described rectangle (2-1).

3, as the cylinder skull of claim 1 or 2, it is characterized in that: the corner circular arc of described rectangle (2-1) is excessive.

4, cylinder skull as claimed in claim 3 is characterized in that: the length of described breathing valve block (2) is 30 ~ 45mm.

5, cylinder skull as claimed in claim 4 is characterized in that: also be provided with stiffening rib (3) on the described enclosing cover (1).

6, cylinder skull as claimed in claim 5 is characterized in that: described stiffening rib (3) is for being arranged on inner chamber (1-2) the reciprocal projection of the bottom (1-1) of described enclosing cover (1) to described enclosing cover (1).

7, cylinder skull as claimed in claim 6 is characterized in that: described stiffening rib (3) is along the circumferential setting of the dished cover (1-3) of described enclosing cover (1).

8, cylinder skull as claimed in claim 7 is characterized in that: be provided with a circle described stiffening rib (3) on the described enclosing cover (1).

9, cylinder skull as claimed in claim 8 is characterized in that: be provided with seal ring (5) between described enclosing cover (1) and described inner cap (4).

10, cylinder skull as claimed in claim 9 is characterized in that: described seal ring (5) is " O " shape seal ring.