JP2533324Y2 - Camshaft stopper device for valve train of overhead cam type engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camshaft stopper device for a valve train of an overhead cam type engine.

[0002]

2. Description of the Related Art FIG. 4 shows a prior art of a valve train for an overhead cam type engine. As shown in FIG. 4A, a flange-shaped journal portion 102 formed on a camshaft 101 is fitted into a bearing hole 104 of a camshaft bearing portion 103, and an upper side of the camshaft bearing portion 103 is formed. To the rocker arm bracket 105 and the bracket fixing bolt 106
It is attached and configured.

By the way, in this prior art, FIG.
As shown in FIG. 7, in order to restrict the backlash of the camshaft 101 in the axial direction, an annular stopper 107 is fitted on the camshaft 101, and the stopper 107 is attached to the cylinder head 108.
Stopper fixing bolts 110
It was attached with.

[0004]

In the above prior art, an annular stopper 107 is fitted on the cam shaft 101, and the stopper 107 is attached to the side wall 109 of the cylinder head 108.
Since the mounting portions of the rocker arm bracket 105 and the stopper 107 are separately provided, the mounting portion of the rocker arm bracket 105 and the mounting portion of the stopper 107 are separately provided. Is performed separately from the installation. For this reason, the assembly work of the valve train was complicated and inefficient.

[0005]

According to the present invention, as shown in FIG. 1A, a flange-shaped journal portion 2 formed on a cam shaft 1 is fitted into a bearing hole 4 of a bearing portion 3 for a cam shaft. The valve gear of the overhead cam type engine in which the rocker arm bracket 5 is attached to the upper side of the cam shaft bearing 3 with the bracket fixing bolts 6 is characterized by the following configuration.

As shown in FIG. 1B, stopper pieces 7.7 in the axial direction of the camshaft 1 are provided along both side faces 8.8 of the journal portion 2, and the stopper pieces 7.7 are provided. The rocker arm bracket 5 and the camshaft bearing 3 are fastened together with the bracket fixing bolts 6 and 6 and attached.

[0007]

The stopper pieces 7.7 in the axial direction of the camshaft 1 are provided along both side faces 8.8 of the journal portion 2, and the stopper pieces 7.7 are provided together with the rocker arm bracket 5 by bracket fixing bolts 6.6. When the valve gear is assembled, the mounting of the rocker arm bracket 5 and the mounting of the stopper pieces 7.7 are jointly tightened with the bracket fixing bolts 6.6. It will be done at the same time. For this reason, the efficiency of the assembly work of the valve train is enhanced.

[0008]

[Effects of the Invention] The stopper piece in the axial direction of the camshaft is provided along both side surfaces of the journal portion, and this stopper piece is attached together with the rocker arm bracket to the camshaft bearing portion together with the rocker arm bracket with the bracket fixing bolt, so that it is mounted. At the time of assembling the valve gear, the mounting of the rocker arm bracket and the mounting of the stopper piece are performed simultaneously by jointly fastening the bracket fixing bolts. For this reason,
The efficiency of the assembly work of the valve train is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a camshaft stopper device in a valve gear of an overhead cam type engine according to an embodiment of the present invention.
1A is a sectional view taken along the line II of FIG. 2, FIG. 1B is a sectional view taken along the line BB of FIG. 1, and FIG. 1C is a perspective view of a stopper fitting of the cam shaft. FIG. 2 is a plan view of the cylinder head. FIG. 3 is a sectional view taken along line III-III of FIG.

In FIG. 3, reference numeral 9 denotes a cylinder head. An intake port 10 and an exhaust port 11 are formed in the wall of the cylinder head, and the periphery of the intake port 10 and the exhaust port 11 is covered with a water cooling jacket 12. I have. Intake port 1
0 and the exhaust port 11
Is provided with an exhaust valve 14.

The cylinder head 9 is provided with a valve gear, which is as follows. As shown in FIG. 3, the camshaft 1 is provided above the cylinder head 9, and the rocker arm shaft 15 is provided above the camshaft 1. The valve operating cam 16 is fixed to the cam shaft 1, and the rocker arm 17 is swingably attached to the rocker arm shaft 15.
The input end 18 of the valve 7 contacts the cam surface 19 of the valve cam 16, and the output end 20 of the rocker arm 17 contacts the valve shaft head 21 of the intake valve 13 and the exhaust valve 14.

The camshaft 1 and the rocker arm shaft 15 constituting this valve train are mounted on the cylinder head 9 as follows. As shown in FIG. 1A, the camshaft bearing 3 is raised upward from the upper wall 22 of the cylinder head 9. A flange 2 is formed on the camshaft 1. This journal part 2 is used as a cam shaft bearing part 3.
The camshaft 1 is fitted in the bearing hole 4. The rocker arm bracket 5 is fixed to the upper side of the camshaft bearing 3 with two bracket fixing bolts 6. The rocker arm shaft 15 has an intermediate portion supported by being fitted into the shaft hole 23 of the rocker arm bracket 5, and both ends of the rocker arm shaft 15 are supported by brackets 24 for supporting both ends, as shown in FIG.

This valve train is provided with a stopper device in order to prevent the camshaft 1 from rattling in the axial direction.
It looks like this: As shown in FIGS. 1A and 1B, a stopper fitting 25 is attached to the camshaft bearing 3. This stopper fitting 25 is shown in FIG.
As shown in FIG. 7, a metal plate is formed by bending and formed by forming a pair of U-shaped downwardly facing stopper pieces 7 on opposite sides of a pair of horizontal mounting pieces 26. doing. This stopper fitting 25 is shown in FIG.
As shown in (A), the mounting pieces 26 are fixed together with the rocker arm bracket 5 to the camshaft bearing 3 together with the rocker arm bracket 5 by the bracket fixing bolts 6 and 6 and are fixed to the camshaft bearing 3. Then, as shown in FIG. 1B, the stopper pieces 7.7 are arranged along both side surfaces 8.8 of the journal portion 2.

[Brief description of the drawings]

FIG. 1 is a view for explaining a camshaft stopper device in a valve train of an overhead cam type engine according to an embodiment of the present invention; FIG. 1 (A) is a cross-sectional view taken along line II of FIG. 2; FIG. 1 (B)
FIG. 1 is a sectional view taken along the line BB of FIG. 1, and FIG. 1 (C) is a perspective view of a stopper fitting of the cam shaft.

FIG. 2 is a plan view of a cylinder head.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a view for explaining a stopper device of a valve train of an overhead cam type engine according to the related art. FIG. 4 (A) is a diagram corresponding to FIG. 1 (A), and FIG. 4 (B) is FIG. It is a BB sectional view taken on the line of (A).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cam shaft, 2 ... Journal part, 3 ... Cam shaft bearing part, 4 ... 3 bearing hole, 5 ... Rocker arm bracket, 6
... Bracket fixing bolt, 7 ... Stopper piece, 8 ... 2
Sides.

Claims (1)

(57) [Scope of request for utility model registration] 1. A camshaft (1) having a flange-shaped journal (2) formed therein is fitted in a bearing hole (4) of a camshaft bearing (3), and the camshaft bearing (3) is provided. In the valve apparatus for an overhead cam type engine in which a rocker arm bracket (5) is mounted on the upper side with bracket fixing bolts (6) and (6), a stopper piece (7) and an axial stopper (7) (7) is provided along both sides (8) and (8) of the journal part (2),
The stopper pieces (7) and (7) were fastened together with the rocker arm bracket (5) to the cam shaft bearing (3) with the bracket fixing bolts (6) and (6). A camshaft stopper device in a valve gear for an overhead cam engine.