Cylinder head rocker arm pin limiting structure

Abstract

The utility model discloses an air cylinder head rocker arm pin limiting structure which comprises rocker arms installed on an air cylinder head in a left-right mirror symmetry mode and a bilateral limiting plate installed in the middle of the air cylinder head located between the rocker arms, the whole rocker arms obliquely extend downwards and inwards, and the middle portions of the rocker arms are installed on the air cylinder head in a penetrating and inserting mode through rocker arm pins. The rocker arm pin is perpendicular to the rocker arm, a limiting groove is formed in the inner end of the rocker arm pin, the left side and the right side of the bilateral limiting plate are bent forwards to form a check block inserted into the limiting groove, and the outer side inclined face of the check block is attached to the groove bottom of the limiting groove, so that the rocker arm pin is prevented from rotating while the rocker arm pin is prevented from axially moving. The radial limiting device has the advantages that axial limiting is achieved, the structural design is reasonable, the design concept is ingenious, the structures are linked with one another, potential safety hazards are eliminated, and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylinder head rocker arm shafts, and in particular relates to a cylinder head rocker arm pin limiting structure. Background Art

[0002] like Figure 3 As shown, the current limiters of the rocker arm shaft of the cylinder head are that an annular groove a is provided at the inner end of the rocker arm pin 5, and then a limit baffle b is installed in the annular groove, and the limit baffle fits the outer wall of the rocker arm pin, thereby limiting the movement of the rocker arm pin in the axial direction and preventing the rocker arm pin 5 from axially falling off. However, it will also increase the rotational resistance of the rocker arm, and there is a lack of measures to limit the self-rotation of the rocker arm pin, which causes the mounting pin hole of the rocker arm pin to wear and become larger during the self-rotation process, thereby increasing the valve clearance, causing starting rebound, insufficient power, and even fracture and failure in severe cases, posing a huge safety hazard. Summary of the invention

[0003] The utility model aims to provide a cylinder head rocker arm pin limiting structure with axial and radial limiting and strong safety performance, and solves the problem that the lack of measures to limit the self-rotation of the rocker arm shaft causes the mounting pin hole to wear and become larger during the self-rotation of the rocker arm shaft, thereby increasing the valve clearance, causing starting rebound, power shortage, and even fracture and failure in severe cases.

[0004] To this end, the technical solution adopted by the utility model is: a cylinder head rocker pin limiting structure, including rocker arms installed on the cylinder head in a mirror-symmetrical manner on the left and right sides and a double-sided limiting plate centrally installed on the cylinder head between the rocker arms, the rocker arm as a whole extends obliquely downward and inward, and the middle part is installed on the cylinder head through a rocker pin, the rocker pin is perpendicular to the rocker arm, and a limiting groove is provided at the inner end of the rocker pin, the left and right sides of the double-sided limiting plate are bent forward to form a stopper inserted into the limiting groove, and the outer inclined surface of the stopper is in contact with the bottom of the limiting groove, thereby preventing the rocker pin from axial movement while preventing the rocker pin from rotating.

[0005] As a preferred embodiment of the above scheme, a limit plate mounting hole is provided in the center of the double-sided limit plate, and is mounted on the cylinder head by means of a clamping bolt passing through the mounting hole, so that the installation is stable.

[0006] Further preferably, the groove depth of the limiting groove does not exceed the radius length of the rocker pin, thereby ensuring the structural stability of the rocker pin and avoiding structural weakness at the location where the limiting groove is provided.

[0007] Further preferably, the width of the limiting groove is no more than twice the thickness of the stopper, thereby ensuring that the axial limitation of the rocker pin is within a reasonable range and that there is a certain amount of free movement space.

[0008] Further preferably, the left and right sides of the rocker arm are provided with support plates bent backwards, and the support plates are provided with mounting pin holes for the rocker arm pins to pass through, and the structural design is reasonable.

[0009] Beneficial effects of the utility model:

[0010] (1) Compared with only axially limiting the rocker shaft to prevent it from falling off, there is no structure to limit the self-rotation of the rocker shaft. In this scheme, a limiting groove is set at the inner end of the rocker shaft, and the stopper formed by the left and right sides of the double-sided limiting plate bent forward is inserted into the limiting groove to perform axial limiting and prevent the rocker shaft from falling off. The structural design is reasonable.

[0011] (2) The outer inclined surface of the block fits with the bottom of the limit groove, thereby ensuring that the rocker arm shaft cannot rotate and realizing radial limit. The design is ingenious and the structure is interlocking, which effectively solves the safety hazards of increased valve clearance, starting rebound, insufficient power, and even fracture and failure in serious cases.

[0012] To sum up, it has the advantages of axial limitation, reasonable structural design, ingenious design conception, interlocking structure, and elimination of safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 for Figure 1 Schematic diagram of the AA section.

[0015] Figure 3 It is a schematic diagram of the existing cylinder head rocker arm pin limiting structure. DETAILED DESCRIPTION

[0016] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0017] Combination Figure 1 — Figure 2 As shown, a cylinder head rocker arm pin limiting structure is composed of a rocker arm 1 installed on the cylinder head 4 in a mirror-symmetrical manner on the left and right, and a double-sided limiting plate 2 installed centrally on the cylinder head 4 between the rocker arms 1.

[0018] The rocker arm 1 extends obliquely downward and inward as a whole, and the middle portion is installed on the cylinder head 4 through the rocker arm pin 5.

[0019] The rocker arm pin 5 is perpendicular to the rocker arm 1 .

[0020] A limiting groove 51 is provided at the inner end of the rocker pin 5 .

[0021] The left and right sides of the double-sided limiting plate 2 are bent forward to form a stopper 21 inserted into the limiting groove 51 .

[0022] The outer inclined surface of the stopper 21 is in contact with the bottom of the limiting groove 51 , thereby preventing the rocker pin 5 from axial movement and self-rotation.

[0023] A limiting plate mounting hole is provided at the center of the double-sided limiting plate 2, and is mounted on the cylinder head 4 by means of a clamping bolt 3 passing through the mounting hole.

[0024] The depth of the limiting groove 51 does not exceed the radius length of the rocker pin 5 .

[0025] The width of the limiting groove 51 is not greater than twice the thickness of the stopper 21 .

[0026] The left and right sides of the rocker arm 1 are provided with support plates bent backwards, and the support plates are provided with mounting pin holes for the rocker arm pins 5 to pass through.

[0027] A limiting groove is arranged at the inner end of the rocker arm shaft, and after the stopper formed by bending the left and right sides of the double-sided limiting plate forward is inserted into the limiting groove, axial limiting can be performed to prevent the rocker arm shaft from falling off.

[0028] The outer inclined surface of the block fits with the bottom of the limit groove, thereby ensuring that the rocker arm shaft cannot rotate and achieving radial limitation, effectively solving the safety hazards of increased valve clearance, starting rebound, insufficient power, and even breakage and failure in severe cases.

[0029] Thereby achieving axial and radial limitation of the rocker arm shaft.

Claims

1. A cylinder head rocker arm pin limiting structure, characterized in that: The invention comprises a rocker arm (1) which is symmetrically mounted on a cylinder head (4) on the left and right sides and a double-sided limit plate (2) which is centrally mounted on the cylinder head (4) between the rocker arms (1); the rocker arm (1) extends obliquely downward and inward as a whole, and the middle part is inserted and mounted on the cylinder head (4) through a rocker arm pin (5); the rocker arm pin (5) is perpendicular to the rocker arm (1); a limit groove (51) is provided at the inner end of the rocker arm pin (5); the left and right sides of the double-sided limit plate (2) are bent forward to form a stopper (21) inserted into the limit groove (51); the outer inclined surface of the stopper (21) is in contact with the bottom of the limit groove (51), thereby preventing the rocker arm pin (5) from axial movement and self-rotation.

2. A cylinder head rocker pin limiting structure according to claim 1, characterized in that: The center of the double-sided limit plate (2) is provided with a limit plate mounting hole, and is mounted on the cylinder head (4) by means of a clamping bolt (3) passing through the mounting hole.

3. The cylinder head rocker pin limiting structure according to claim 1, characterized in that: The groove depth of the limiting groove (51) does not exceed the radius length of the rocker arm pin (5).

4. A cylinder head rocker arm pin limiting structure according to claim 3, characterized in that: The width of the limiting groove (51) is no greater than twice the thickness of the stopper (21).

5. The cylinder head rocker pin limiting structure according to claim 1, characterized in that: The left and right sides of the rocker arm (1) are provided with support plates bent backwards, and the support plates are provided with mounting pin holes for the rocker arm pins (5) to pass through.

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