CN101956623B - Cylinder head assembly - Google Patents

Abstract

The invention discloses a cylinder head assembly. Five cylinder head support lugs are arranged at the outer edge of the top surface of a cylinder head and each cylinder head support lug is provided with a screw hole; five cylinder cover support lugs are arranged at the outer edge of the bottom of a cylinder head cover and each cylinder cover support lug is provided with a via hole; five positioning support lugs are arranged at the outer edge of a sealing gasket and each positioning support lug is provided with a positioning hole; a screw passes through the via holes of all the cylinder cover support lugs on the cylinder head cover and the corresponding positioning holes on the sealing gasket and is screwed in the screw holes of the corresponding cylinder head support lugs to fix the cylinder head cover, the sealing gasket and the cylinder head together. Since the sealing gasket, the cylinder head and the cylinder head cover are fixed together tightly, the position of the sealing gasket is fixed relatively, the generation of a gap can be avoided effectively when the sealing gasket is pressed to deform; and distances between the screw holes of every two adjacent support lugs of the five cylinder head support lugs of the cylinder head are set to be consistent basically, therefore, even strength for each stressed part can be ensured after assembly, and the sealing gasket can achieve good stressed deformation effect, which is beneficial to improving the sealing performance.

Description

A cylinder head assembly

technical field

The invention belongs to the technical field of gasoline engines, and in particular relates to a general gasoline engine cylinder head assembly.

Background technique

The upper end of the general gasoline engine cylinder head is buckled with a cylinder head cover, and the cavity at the top of the cylinder head is sealed by the cylinder head cover. A gasket is arranged between the cylinder head and the cylinder head cover, and the gasket plays a role of sealing. The structure of the traditional cylinder head is shown in Figure 5 and Figure 6, the top surface of the cylinder head 1 is a trapezoidal ring structure, and the adjacent sides of the trapezoid are transitioned by circular arcs. A first cylinder head lug 1a is provided on the right side of the front edge outer edge of the top surface of the cylinder head 1, and a second cylinder head lug 1b is provided on the left side of the rear edge outer edge of the top surface of the cylinder head 1. A third cylinder head lug 1c is provided on the outer edge where the front sides connect, and a fourth cylinder head lug 1d is provided on the rear of the right outer edge of the top surface of the cylinder head 1 . Screw holes 1f are provided on each cylinder head lug on the top surface of the cylinder head 1 .

The structure of the traditional cylinder head cover is shown in Figure 5 and Figure 7. The bottom surface of the cylinder head cover 2 is a trapezoidal ring structure, the shape and size of which are adapted to the contour of the top surface of the cylinder head 1, and the adjacent sides of the trapezoid pass through Arc transition. A first cylinder head lug 2a, a second cylinder head lug 2b, a third cylinder head lug 2c and a fourth cylinder head lug 2d are arranged on the outer edge of the bottom surface of the cylinder head cover 2. Each cylinder head lug of the cylinder head cover 2 corresponds to the cylinder head lug on the cylinder head 1 one by one, and each cylinder head lug is provided with a via hole 2f. The screw passes through the through hole 2f of each cylinder head lug on the cylinder head cover 2, and is screwed into the screw hole 1f of the corresponding cylinder head lug, so that the cylinder head cover 2 and the cylinder head 1 are fixed together.

The structure of the traditional gasket is shown in Fig. 5 and Fig. 8. The gasket 3 has a trapezoidal ring structure, and its shape and size are adapted to the contour of the top surface of the cylinder head 1. When the cylinder head 1 and the cylinder head cover 2 are fastened by four screws, the gasket 3 is compressed and deformed to achieve the purpose of sealing.

The shortcomings of the traditional cylinder head sealing structure are:

1. Since there is no connecting hole on the gasket 3, the position between the cylinder head 1 and the cylinder head cover 2 is not fixed. When the cylinder head 1 and the cylinder head cover 2 are fastened, the gasket 3 is prone to shaking, so the gasket 3 There will be gaps after deformation under pressure, and it is difficult to achieve the ideal sealing effect.

2. The screw holes of the four lugs on the top surface of the cylinder head 1 are arranged in unequal sides, especially the second cylinder head lug 1b and the third cylinder head lug 1c and the second cylinder head lug 1b and the fourth lug. The distance between the screw holes between the cylinder head lugs 1d is too large and spans the arc segment, because the second cylinder head lug 1b and the third cylinder head lug 1c and the second cylinder head lug 1b and the fourth cylinder head lug The strength of the middle part between the ears 1d is relatively weak, and the joint with the corresponding cylinder head lugs on the cylinder head cover 2 cannot sufficiently deform the gasket 3, so the sealing effect is poor, and it is easy to cause oil and air leakage. On the one hand, it will Affect the performance of the gasoline engine; on the other hand, the oil overflows from the gap between the cylinder head and the cylinder head cover, which will damage the appearance of the gasoline engine. In order to prevent engine oil from overflowing, some manufacturers use a hammer to strike the gasket to completely deform it. However, the use of a hammer to strike may easily cause damage to the cylinder head cover, and additionally increase the workload of the workers, and the effect is not ideal.

Contents of the invention

The technical problem to be solved by the present invention is to provide a cylinder head assembly that can effectively improve the sealing effect.

The technical scheme of the present invention is as follows: a cylinder head assembly, including a cylinder head, a cylinder head cover and a gasket, a cylinder head cover is installed on the cylinder head, a gasket is arranged between the cylinder head and the cylinder head cover, the cylinder head The top surface of the cylinder head is a trapezoidal annular structure, and the adjacent sides of the trapezoid are transitioned through a circular arc. The first cylinder head lug is provided on the right side of the outer edge of the front edge of the top of the cylinder head, and the rear edge of the top surface of the cylinder head is provided with a The second cylinder head support lug, the outer edge of the connection between the left side of the cylinder head top surface and the front side is provided with the third cylinder head support lug, the rear part of the right outer edge of the cylinder head top surface is provided with the fourth cylinder head support lug, each cylinder head of the cylinder head There are screw holes on the lugs; the shape and size of the bottom surface of the cylinder head cover are adapted to the contour of the top surface of the cylinder head, and the first cylinder head lug and the second cylinder head lug are arranged on the outer edge of the bottom surface of the cylinder head cover. , the third cylinder head lug and the fourth cylinder head lug, each cylinder head lug corresponds to the cylinder head lug on the cylinder head, and each cylinder head lug has a via hole; the gasket is Trapezoidal annular structure, whose shape and size are adapted to the contour of the top surface of the cylinder head. The key is that the second cylinder head lug is located on the right side of the outer edge of the rear edge of the top surface of the cylinder head, and on the rear edge of the left outer edge of the top surface of the cylinder head. A fifth cylinder head lug is provided at the end, and a screw hole is opened on the fifth cylinder head lug; a fifth cylinder head lug is provided at the rear end of the left outer edge of the bottom surface of the cylinder head, and the fifth cylinder head The position of the lug corresponds to the fifth cylinder head lug, and the fifth cylinder head lug has a through hole; five positioning lugs are arranged on the outer edge of the gasket, and each positioning lug is connected to the cylinder The cylinder head lugs on the head correspond one by one, and each positioning lug has a positioning hole; the screw passes through the through hole of each cylinder head lug on the cylinder head cover, the corresponding positioning hole on the gasket, and screws into the corresponding cylinder. Fix the cylinder head cover, gasket and cylinder head together in the screw holes of the head lugs.

The present invention adds a cylinder head lug to the outer edge of the top surface of the cylinder head, and adjusts the position of the cylinder head lug, so that the hole distances of the screw holes on the two adjacent cylinder head lugs are close to each other, and the cylinder head cover is adaptively improved. ; At the same time, add five positioning lugs with through holes on the outer edge of the gasket. The positioning lugs correspond to the cylinder head lugs and the cylinder head lugs one by one, so that the cylinder head cover, the gasket and the cylinder head are connected by five screws. When the cylinder heads are connected together, the gasket is positioned reliably between the cylinder head and the cylinder head cover without shaking, which can effectively prevent the gasket from forming a gap after being deformed under pressure. Since the screw holes of two adjacent cylinder head lugs on the top surface of the cylinder head are close to a straight line seal, almost no arc section is crossed, and the strength of each stressed part is uniform, which can ensure that the gasket is evenly deformed under pressure, thereby effectively improving the sealing effect and eliminating The disadvantages of oil leakage and air leakage have been eliminated, and the performance of the gasoline engine has been improved.

In order to facilitate processing and reduce costs, the cylinder head lug is an integral structure; the cylinder head lug and the cylinder head cover are an integral structure; the positioning lug and the gasket are an integral structure.

The sealing experiment before the improvement of the cylinder head sealing structure is shown in Table 1:

Table I

Lifan Industry (Group) Co., Ltd. Engine Experiment Record Form

The sealing experiment after the improvement of the cylinder head sealing structure is shown in Table 2:

Table II

Lifan Industry (Group) Co., Ltd. Engine Experiment Record Form

Test name Air tightness detection Test No. 20090203

Comparing Table 1 and Table 2, it can be seen that the pressure requirement of the cylinder head sealing structure is less than or equal to 0.05Mpa. Before the improvement of the cylinder head sealing structure, air leakage will occur when the pressure exceeds 0.03Mpa. After the improvement, the cylinder head sealing structure is within the pressure requirement range. There will be no air leakage inside. It can be seen that the sealing performance can be effectively improved by adopting the technical solution described in the present invention.

Beneficial effects: the present invention is reasonable in design, simple in structure and convenient in transformation. The sealing gasket is fastened together with the cylinder head and the cylinder head cover, and the position of the sealing gasket is relatively fixed, which effectively avoids the gap generated after the sealing gasket is deformed under pressure; The screw hole spacing of adjacent lugs on the first five cylinder head lugs is set to be basically the same, which can ensure that the strength of each stress-bearing part after installation is uniform, and the gasket has a good deformation effect under pressure, which is conducive to improving the sealing performance.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural schematic diagram of the cylinder head in the present invention.

Fig. 3 is a structural schematic diagram of the cylinder head cover in the present invention.

Fig. 4 is a schematic structural diagram of the gasket in the present invention.

Fig. 5 is a schematic structural diagram of the background technology.

Fig. 6 is a schematic structural view of a cylinder head in the background art.

Fig. 7 is a schematic structural diagram of a cylinder head cover in the background art.

Fig. 8 is a schematic structural diagram of a gasket in the background technology.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Fig. 1 and Fig. 2, the top surface of the cylinder head 1 is a trapezoidal annular structure with a small front and a large rear, and the adjacent sides of the trapezoid are transitioned by circular arcs. A first cylinder head lug 1a is integrally formed on the right side of the top front outer edge of the cylinder head 1, and a screw hole 1f is opened on the first cylinder head lug 1a. The right part of the rear outer edge of the top surface of the cylinder head 1 is integrally formed with a second cylinder head lug 1b, and a screw hole 1f is opened on the second cylinder head lug 1b. A third cylinder head lug 1c is integrally formed on the outer edge of the connection between the left side of the top surface of the cylinder head 1 and the front side, and a screw hole 1f is opened on the third cylinder head lug 1c. A fifth cylinder head lug 1e is integrally formed at the rear end of the left outer edge of the top surface of the cylinder head 1, and a screw hole 1f is opened on the fifth cylinder head lug 1e. The rear portion of the right outer edge of the top surface of the cylinder head 1 is integrally formed with a fourth cylinder head lug 1d, and a screw hole 1f is also opened on the fourth cylinder head lug 1d. The above cylinder head lugs are arc-shaped, and the apertures of the screw holes 1f on each cylinder head lug are equal, and the spacing of the screw holes on two adjacent cylinder head lugs is close to each other. The rest of the structure of the cylinder head 1 is the same as the prior art, and will not be repeated here.

As shown in Figure 1 and Figure 3, the bottom surface of the cylinder head cover 2 is a trapezoidal ring structure with a small front and a large rear, and its shape and size are adapted to the contour of the top surface of the cylinder head 1, and the adjacent sides of the trapezoid are connected by circular arcs. transition. A first cylinder head lug 2a is integrally formed on the right part of the bottom front outer edge of the cylinder head cover 2, and a through hole 2f is opened on the first cylinder head lug 2a. The right part of the rear outer edge of the bottom surface of the cylinder head cover 2 is integrally formed with a second cylinder head lug 2b, and a through hole 2f is opened on the second cylinder head lug 2b. A third cylinder head lug 2c is integrally formed on the outer edge of the connection between the left side of the bottom surface of the cylinder head cover 2 and the front edge, and a through hole 2f is opened on the third lug 2c. A fifth cylinder head lug 2e is integrally formed at the rear end of the left outer edge of the bottom surface of the cylinder head cover 2, and a through hole 2f is opened on the fifth cylinder head lug 2e. The rear part of the right outer edge of the bottom surface of the cylinder head cover 2 is integrally formed with a fourth cylinder head lug 2d, and the fourth cylinder head lug 1d2 is also provided with a through hole 2f. The shape and size of the five cylinder head lugs correspond to the five cylinder head lugs one by one, and the through hole 1f on each cylinder head lug is facing the corresponding screw hole 1f of the cylinder head lug. The rest of the structure of the cylinder head cover 2 is the same as the prior art, and will not be repeated here.

As shown in Fig. 1 and Fig. 4, the sealing gasket 3 is a trapezoidal annular structure with a small front and a large rear, and its shape and size are adapted to the contour of the top surface of the cylinder head 1, and the adjacent sides of the trapezoid are transitioned by circular arcs. Five positioning lugs 3a are integrally formed on the outer edge of the gasket 3, the shape and size of each positioning lug 3a correspond to the cylinder head lugs on the cylinder head 1 one by one, and each positioning lug 3a There are positioning holes 3b. The cylinder head cover 2 is buckled on the upper end of the cylinder head 1, the gasket 3 is located between the cylinder head cover 2 and the cylinder head 1, and five screws pass through the holes of the five cylinder head lugs on the cylinder head cover 2 respectively. 2f, the corresponding positioning hole 3b on the gasket 3, and screw it into the screw hole 1f of the corresponding cylinder head lug, and fix the cylinder head cover 2, the gasket 3 and the cylinder head 1 together. Since the screw holes of the two adjacent lugs on the top surface of the cylinder head 1 are nearly linearly sealed, almost no arc section is crossed, and the strength of each stress-bearing part is uniform, which can ensure that the gasket 3 is evenly deformed under pressure, thereby effectively improving the sealing effect; The position of the sealing gasket 3 is relatively fixed and does not shake, which can further improve the sealing effect.

Claims (4)

1. cylinder head; Go up installation cylinder skull (2) at cylinder head (1), be provided with sealing gasket (3) between cylinder head (1) and the cylinder skull (2), the end face of said cylinder head (1) is trapezoidal ring structure; And pass through arc transition between the trapezoidal adjacent edge; Right part in outer, cylinder head (1) end face front is provided with the first cylinder head journal stirrup (1a), and the outer, back of cylinder head (1) end face is provided with the second cylinder head journal stirrup (1b), and the outer of cylinder head (1) the end face left side and front connecting place is provided with the 3rd cylinder head journal stirrup (1c); The rear portion of outer, cylinder head (1) end face the right is provided with the 4th cylinder head journal stirrup (1d), all has screw (1f) on each cylinder head journal stirrup of cylinder head (1); The shape size of said cylinder skull (2) bottom surface adapts to the profile phase of cylinder head (1) end face; Be provided with the first cylinder cap journal stirrup (2a), the second cylinder cap journal stirrup (2b), the 3rd cylinder cap journal stirrup (2c) and the 4th cylinder cap journal stirrup (2d) in the outer of cylinder skull (2) bottom surface; Each cylinder cap journal stirrup is corresponding one by one with cylinder head journal stirrup on the cylinder head (1), and has via hole (2f) on each cylinder cap journal stirrup; Said sealing gasket (3) is trapezoidal ring structure; The shape size adapts to the profile phase of cylinder head (1) end face; It is characterized in that: the said second cylinder head journal stirrup (1b) is positioned at the right part of outer, cylinder head (1) end face back; Be provided with the 5th cylinder head journal stirrup (1e) in the rear end of outer, said cylinder head (1) the end face left side, have screw (1f) on the 5th cylinder head journal stirrup (1e); Be provided with the 5th cylinder cap journal stirrup (2e) in the rear end of outer, said cylinder skull (2) left side, bottom surface, the position of the 5th cylinder cap journal stirrup (2e) is corresponding with the 5th cylinder head journal stirrup (1e), and has via hole (2f) on the 5th cylinder cap journal stirrup (2e); The outer of said sealing gasket (3) is provided with five location journal stirrups (3a), and it is corresponding one by one with cylinder head journal stirrup on the cylinder head (1) that each locatees journal stirrup (3a), and respectively locatees and have positioning hole (3b) on the journal stirrup (3a); Screw passes cylinder skull (2) and goes up the upward corresponding positioning hole (3b) of the via hole (2f) of each cylinder cap journal stirrup, sealing gasket (3), and screws in the screw (1f) of corresponding cylinder head journal stirrup, and cylinder skull (2), sealing gasket (3) and cylinder head (1) are fixed together.

2. cylinder head according to claim 1 is characterized in that: said cylinder head journal stirrup (1a, 1b, 1c, 1d, 1e) is an overall structure with cylinder head (1).

3. cylinder head according to claim 1 is characterized in that: said cylinder cap journal stirrup (2a, 2b, 2c, 2d, 2e) is an overall structure with cylinder skull (2).

4. cylinder head according to claim 1 is characterized in that: said location journal stirrup (3a) is an overall structure with sealing gasket (3).

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