JP2520603Y2 - End pivot type rocker arm support structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a support structure for an end pivot type rocker arm, and in particular, the end pivot type rocker arm can be stably supported on a rocker shaft to improve the assemblability of a camshaft. The present invention relates to a support structure of an end pivot type rocker arm that can be improved.

[Conventional technology]

A valve mechanism that drives an intake valve and an exhaust valve of an internal combustion engine pushes and retracts each valve stem of the intake and exhaust valve by a camshaft that is rotated by the internal combustion engine to open and close the intake and exhaust valve. . A rocker arm is interposed between the camshaft and the valve stem in order to convert the rotational movement of the camshaft of the valve mechanism into the pushing / pulling movement of the valve system.

The rocker arm includes a seesaw type rocker arm, an end pivot type rocker arm, and the like. The seesaw-type rocker arm has a middle part pivotally supported on a rocker shaft so that one end contacts the cam of the cam shaft and the other end contacts the end of each valve stem of the intake and exhaust valves. I am letting you. As shown in FIG. 5, the end pivot type rocker arm has a pivot receiver 1 attached to the cylinder head 102.
A partial spherical projection of the pivot shaft 110 provided at one end of the end pivot type rocker arm 108 in the partial spherical recess 106 of 04.
112 is rockably engaged and the camshaft 1
The other end side is brought into contact with the end portion of each valve stem 120 of the intake / exhaust valve 118 while being brought into contact with the cam 116 of 14.

As such an end pivot type rocker arm,
There is one disclosed in Japanese Utility Model Publication No. 61-49006. The end pivot type rocker arm disclosed in this publication has an annular groove between an upper flange portion provided with a partially spherical recess of a pivot receiver mounted on a cylinder head and a lower flange portion abutting on the cylinder head. Is provided in the annular groove
The end pivot type rocker arm is a cylinder by engaging the bifurcated portion on one end side of the rocker arm spring, which is a V-shaped elastic clamp member, and by engaging the end of the annular portion on the other end side of the rocker arm spring with the upper surface of the end pivot type rocker arm. The structure is provided so as to be supported by the head, and the diameter of the lower flange portion of the pivot receiver is formed to be larger than the diameter of the upper flange portion.

[Problems to be solved by the invention]

By the way, as shown in FIG. 5, an end pivot provided by swingably engaging a partially spherical projection 112 of a pivot shaft 110 with a partially spherical recess 106 of a pivot receiver 104 mounted on a cylinder head 102. The rocker arm 108 has an end pivot rocker arm 1 by the rocker arm spring 122.
It is a structure in which 08 is supported by the cylinder head 102 via a pivot receiver 104.

However, a partial spherical recess is formed on a rocker shaft that pivotally supports a seesaw type rocker arm, and a partial spherical projection of a pivot is swingably engaged with the partial spherical recess. The end pivot type rocker arm has a problem that it is difficult to engage the rocker arm spring with the rocker shaft. For this reason, since the end pivot type rocker arm cannot be stably supported by the rocker shaft, there is a problem that the end pivot type rocker arm becomes unstable until it assembles the camshaft, and it floats and falls sideways. Further, there is a problem in that the assembling of the camshaft is troublesome and the assembling property is deteriorated.

[Purpose of device]

Therefore, an object of the present invention is to realize a support structure of an end pivot type rocker arm that can stably support the end pivot type rocker arm on the rocker shaft and improve the assembling property of the cam shaft.

[Means for solving problems]

In order to achieve this object, the present invention is configured such that a partially spherical protrusion of a pivot shaft is swingably engaged with a partially spherical recess formed on a rocker shaft that pivotally supports a seesaw type rocker arm. In the provided end pivot type rocker arm, an elastic clamp member that elastically connects the pivot shaft of the end pivot type rocker arm and the rocker shaft to support the end pivot type rocker arm to the rocker shaft is provided, and the elastic clamp member is provided. A pivot coupling portion formed of a linear member having elasticity and formed in a substantially C shape to be coupled to the pivot shaft, and a small extension from the end portion of the pivot coupling portion through a narrowing portion to extend in parallel and the pivot. Two rocker shaft joints that are joined to a rocker cast formed by folding the joints into a J-shape. Characterized in that it is constituted by the two folded portions formed by folding back the extension tip portion of the rocker shaft coupling portion of the two.

[Action]

According to the configuration of the present invention, the elastic clamp member is provided which is a linear member having elasticity for elastically coupling the pivot shaft and the rocker shaft of the end pivot type rocker arm, and the elastic clamp member is provided with the pivot coupling portion and the rocker shaft coupling portion. Since it is composed of
The end pivot type rocker arm can be elastically supported on the rocker shaft, and the elastic clamp member can be attached before or after the end pivot type rocker arm is attached to the rocker shaft.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 4 show an embodiment of the present invention.
In FIG. 4, 2 is an internal combustion engine, 4 is a cylinder head,
6 is a cam shaft, 8 is a rocker shaft, 10 is a seesaw type rocker arm for exhaust, and 12 is an end pivot type rocker arm for intake.

A camshaft 6 and a rocker shaft 8 are provided above the cylinder head 4 of the internal combustion engine 2. On the rocker shaft 8, an intermediate portion of a seesaw type rocker arm 10 for exhaust is pivotally supported so as to be swingable. This seesaw type rocker arm 10 includes a cam contact portion 14 on one end side of the camshaft 6
The exhaust valve stem pressing portion 18 provided by being abutted on the exhaust cam 16 of the exhaust valve
It is in contact with one end of 20. An exhaust valve 22 is provided at the other end of the exhaust valve stem 20, and an exhaust valve spring 28 is attached to the exhaust valve 22 to apply a biasing force to the exhaust valve 22 in a direction of closing the exhaust port 26 of the exhaust passage 24.

The rocker shaft 8 is formed with a partially spherical recess 30. A partially spherical protrusion 34 of a pivot shaft 32, which is screwed to one end of the intake end pivot type rocker arm 12, is swingably engaged with the partially spherical recess 30. There is. The end pivot type rocker arm 12 is
The cam contact portion 36 at the intermediate portion is connected to the intake cam 38 of the camshaft 6.
The valve stem pressing part 40 on the other end side.
Is brought into contact with one end of the intake valve stem 42. An intake valve 44 is provided at the other end of the intake valve stem 42, and the intake valve 44 is connected to the intake port 48 of the intake passage 46.
An intake valve spring 50 is attached to apply a biasing force in the direction of closing the valve.

As a result, the end pivot type rocker arm 12 and the seesaw type rocker arm 10 are swung by the camshaft 6 which is rotated by the internal combustion engine 2, and the intake valve stem
42 and the exhaust valve stem 20 are pushed and retracted to open and close the intake valve 44 and the exhaust valve 22.

Reference numeral 52 is an adjusting nut for the exhaust valve stem pressing portion 18, and reference numeral 54 is an adjusting nut for the pivot shaft 32.

As described above, the partial spherical projection 34 of the pivot shaft 32 is swingably engaged with the partial spherical recess 30 formed on the rocker shaft 8 pivotally supporting the seesaw type rocker arm 10. First in the end pivot rocker arm 12
As shown in the figure, in order to support the end pivot type rocker arm 12 on the rocker shaft 8, an elastic clamp member 56 that elastically connects the pivot shaft 32 of the end pivot type rocker arm 12 and the rocker shaft 8 is provided.

This elastic clamp member 56, as shown in FIGS.
A pivot connecting part 58 formed of a linear member having elasticity and formed in a substantially C shape to be connected to the pivot shaft 32, and an end portion of the pivot connecting part 58 is expanded slightly through a narrowed portion 60 and extended in parallel. And two rocker shaft coupling portions 62 coupled to the rocker shaft 8 formed by folding back the pivot coupling portion 58 in a substantially J shape, and extension destination portions of the two rocker shaft coupling portions 62. And two folded-back portions 64 formed by folding back.

 Next, the operation will be described.

End pivot type rocker arm 12 rocker shaft 8
When it is supported by the elastic clamp member 56,
The rocker shaft coupling portion 62 of the book sandwiches the pivot shaft 32, and the pivot coupling portion 58 passes through the throttle portion 60 on the pivot shaft 32 side.
Push forward. Thereby, the substantially C-shaped pivot joint portion
The 58 is elastically fitted and coupled to the pivot shaft 32. The pivot joint portion 58 joined to the pivot shaft 32 is prevented from falling off by the partially spherical projection 34 at the tip of the pivot shaft 32.

The pivot joint part of the elastic clamp member 56 on the pivot shaft 32.
The partial spherical projection 34 of the pivot shaft 32 of the end pivot type rocker arm 12 to which 58 is coupled is engaged with the partial spherical recess 30 of the camshaft 6, and the two rocker shaft coupling portions 62 are connected to the circumference of the rocker shaft 8. Position and push forward. As a result, the rocker shaft coupling portion 58 having a substantially J shape is elastically fitted and coupled to the rocker shaft 8.

Alternatively, the partial spherical projection 34 of the pivot shaft of the end pivot type rocker arm 12 is engaged with the partial spherical concave portion 30 of the camshaft, and the elastic clamp member 56 is extended to the extension tip of the two rocker shaft coupling portions 62. The pivot shaft 32 is sandwiched by the provided folded-back portion 64, and the elastic clamp member 56 is sequentially pushed from the folded-back portion 64 to the pivot shaft 32 side via the rocker shaft coupling portion 62, the throttle portion 60, and the rocker shaft coupling. The portion 62 is pushed in the circumferential direction of the rocker shaft 8.
As a result, the substantially C-shaped pivot coupling portion 58 is elastically fitted and coupled to the pivot shaft 32. The rocker shaft coupling portion 62 having a substantially J shape is elastically fitted and coupled to the rocker shaft 8.

As a result, the pivot shaft 32 of the end pivot type rocker arm 12 and the rocker shaft 8 are elastically coupled by the elastic clamp member 56.

Thus, the elastic clamp member 56 made of a linear member having elasticity for elastically coupling the pivot shaft 32 of the end pivot type rocker arm 12 and the rocker shaft 8 is provided, and the elastic clamp member 56 is provided with the pivot coupling portion 58 and the rocker shaft. The end pivot type rocker arm 12 can be elastically supported on the rocker shaft 8 by being configured by the coupling portion 62 and the folded portion 64, and the end pivot type rocker arm 12 can be assembled before the rocker shaft 8 is assembled. The elastic clamp member 56 can be assembled even after the attachment.

Therefore, even before the camshaft 6 is assembled, the end pivot type rocker arm 12 does not loosen and falls in the lateral direction, and the end pivot type rocker arm 12 can be stably supported by the rocker shaft 8 and thus the camshaft 6 can be supported. It is possible to improve the assemblability without taking time and effort for the assembly of No. 6. Also, end pivot type rocker arm
The elastic clamp member 56 can be assembled before or after assembling the 12 rocker shafts 8 and the assembly order does not matter, so that the assembling property can be improved. Moreover, the end pivot type rocker arm 12 can be prevented from moving freely, which is advantageous for sound, and the elastic clamp member can be attached by one-touch due to elasticity, so that the attachment is easy.

[Effect of device]

As described above, according to the present invention, the elastic clamp member including the elastic linear member for elastically coupling the pivot shaft and the rocker shaft of the end pivot type rocker arm is provided, and the elastic clamp member is provided with the pivot coupling portion and the rocker shaft. The end pivot type rocker arm can be elastically supported on the rocker shaft by being composed of the connecting portion and the folded portion, and the end pivot type rocker arm can be elastically attached before or after being attached to the rocker shaft. The clamp member can be assembled.

Therefore, the end-pivot rocker arm does not loosen and falls sideways even before the camshaft is assembled, and the end-pivot rocker arm can be stably supported on the rocker shaft. It is possible to improve the assembling property without trouble. Further, the elastic clamp member can be assembled before or after the end pivot type rocker arm is attached to the rocker shaft, and the assembling order is not limited, so that the assembling property can be improved. Moreover, it is advantageous to the sound by preventing the end pivot type rocker arm from moving.
Further, the elastic clamp member can be easily attached because it can be attached with one touch due to elasticity.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a side view of a support structure of an end pivot type rocker arm, FIG. 2 is a plan view of an elastic clamp member, and FIG. 3 is a pivot of an end pivot type rocker arm. FIG. 4 is a side view showing a state in which the shaft and the rocker shaft are elastically coupled by an elastic clamp member. FIG. 4 shows that the partially spherical projection of the pivot shaft of the end pivot type rocker arm can be swung in the partially spherical recess of the rocker shaft. FIG. 3 is a cross-sectional view of a cylinder head portion of an internal combustion engine that is provided in an engaged manner. FIG. 5 shows a conventional example of an internal combustion engine in which a partial spherical projection of the pivot shaft of an end pivot type rocker arm is swingably engaged with a partial spherical recess of a pivot receiver mounted on a cylinder head. It is sectional drawing of a cylinder head site | part. In the figure, 2 is an internal combustion engine, 4 is a cylinder head, 6 is a camshaft, 8 is a rocker shaft, 10 is a seesaw type rocker arm, 12 is an end pivot type rocker arm, 20 is an exhaust valve stem, 22 is an exhaust valve, and 30 is a part. Spherical recess, 32 pivot axis, 34 partial spherical projection, 42 intake valve stem, 44 intake valve, 56 elastic clamp member,
Reference numeral 58 is a pivot joint portion, 60 is a throttle portion, 62 is a rocker shaft joint portion, and 64 is a folded portion.

Claims (1)

(57) [Scope of utility model registration request] 1. An end pivot type rocker arm having a partially spherical recess formed on a rocker shaft that pivotally supports a seesaw type rocker arm and a partially spherical projection of a pivot shaft being swingably engaged with the rocker shaft. In, in order to support the end pivot type rocker arm on the rocker shaft, an elastic clamp member for elastically coupling the pivot shaft of the end pivot type rocker arm and the rocker shaft is provided, and the elastic clamp member is an elastic linear member. The pivot coupling portion is formed in a substantially C-shape and is coupled to the pivot shaft. The pivot coupling portion extends from the end of the pivot coupling portion to a narrow portion and extends in parallel to the pivot coupling portion. Two rocker shaft connecting parts that are connected to the rocker shaft formed by folding back in a J shape and this 2
A support structure for an end pivot type rocker arm, characterized in that it is constituted by two folded portions formed by folding back an extension end portion of a rocker shaft coupling portion of a book.