JPH0542607U - Locker arm mounting device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To improve assembly of the rocker arm attachment device by improving the leaf spring member. A leaf spring member 21 that engages with the rocker shaft 5 and restrains the rocker arm 6 in the axial direction is provided on a rocker arm 6 pivotally supported by the rocker shaft 5.
The leaf spring member 21 is formed with a fitting portion 22 that surrounds the rocker shaft 5 beyond a half of the outer circumference thereof. Further, the leaf spring member 21 is formed with an abutting portion 23 that abuts against the upper portion of the rocker arm 6 and restricts the swing range of the rocker arm 6, and the rocker arm 6 is temporarily assembled to the rocker shaft 5 at the stage where the rocker arm 6 is temporarily assembled. 6 can be regulated in the axial direction A and the circumferential direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mounting device provided on a rocker arm of a valve mechanism.

[0002]

[Prior Art]

 Valve trains of internal combustion engines include OHV type and OHC type. As shown in FIG. 4, in the OHV type, the rotational movement of the camshaft 1 is converted into the rocking of the rocker arm 6 centered on the rocker shaft 5 via the tappet 2 and the push rod 3, and the opposite is done. The valve 7 provided on the side is moved up and down. Further, as shown in FIG. 5, the OHC type directly transmits the rotational movement of the cam shaft 11 to the rocker arm 12 and causes the rocker shaft 13 to swing around the valve 14 to move the valve 14 up and down.

Of these, the OHV type rocker arm 6 has one side in contact with the push rod 3 and the other side in contact with the valve 7, but since it is only pivotally supported by the rocker shaft 5, its axial direction (longitudinal direction). May slide into. Therefore, as shown in FIG. 3, in order to restrain the rocker arm 6 in the axial direction A, the rocker arm 6 is provided with a coil spring 8 which applies an appropriate thrust force. The coil spring 8 is axially extended around the rocker shaft 5 to press the rocker arm 6 against a bracket 9 fixed to a cylinder head (not shown).

As another mounting structure, as shown in FIGS. 7 and 8, a leaf spring member 10 having a U-shaped vertical cross section is provided, and the rocker arm 6 is urged so as to sandwich the bracket 9 and restrained. There is something to do. As shown in FIG. 9, in the leaf spring member 10, the dimension between the bending surface portions at both ends that engage with the rocker shaft 5 is expanded from the free state (L ₁ ) to the attached state (L ₂ ). (L ₁ <L ₂ ), the urging force in the axial direction A is generated. This structure has the advantage that it is simpler than the coil spring 8 and requires fewer parts.

[0005]

[Problems to be solved by the device]

 When assembling these parts, first, as shown in FIG. 10, the push rod 3 is inserted from above when the cylinder block 15 and the cylinder head 16 are assembled. At this time, the cylinder block 15 and the cylinder head 16 are formed with holes 17 that are sufficiently larger than the outer diameter of the push rod 3 so that the push rod 3 can freely move up and down. Will tilt from the normal direction. In such a state, when the temporarily assembled rocker arm 6, rocker shaft 5 and bracket 9 is dropped from above the cylinder head 16, the adjust screw 18 provided on one side of the rocker arm 6 is naturally provided. The lower end of the push rod 3 and the upper end receiving portion 18 of the push rod 3 are misaligned.

Conventionally, the leaf spring member 10 is mounted after the rocker arm 6, the bracket 9, the rocker shaft 5 and the like are all assembled on the upper surface of the cylinder head 16, so that when the rocker arm 6 is assembled, The thrust force in the axial direction A is not applied and the swing around the shaft is also free, so that there is a problem that assembly failure is more likely to occur.

In view of the above circumstances, the present invention was devised to provide a rocker arm mounting device in which a leaf spring member is improved to prevent assembly failure.

[0008]

[Means for Solving the Problems]

 According to the present invention, a rocker arm pivotally supported by a shaft is provided with a leaf spring member that engages with the shaft and restrains the rocker arm in the axial direction thereof. In addition to forming a surrounding fitting portion, an abutting portion that abuts on the upper portion of the rocker arm to regulate the swing range thereof is formed.

[0009]

[Action]

 With the above configuration, when the rocker arm is temporarily assembled to the shaft, the fitting portion engages with the shaft without dropping so that the leaf spring member constrains the rocker arm in the axial direction and the contact portion in the circumferential direction. regulate.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a rocker arm mounting device according to the present invention. The same components as those of the conventional device are designated by the same reference numerals, and the description thereof will be omitted. In this device, a fitting portion 22 surrounding the shaft 21 is formed on a leaf spring member 21 provided on a rocker arm 6 pivotally supported by a rocker shaft 5, which is a shaft, and the rocking range of the rocker arm 6 is set. The contact part 23 for restricting is formed and comprised.

The leaf spring member 21 has a substantially U-shaped vertical cross section as in the conventional case, and engages with the rocker shaft 5 at both bent ends so as to engage two rocker arms 6 inside the axial direction A. And is attached to the bracket 9 at the bridge portion 24 connecting both ends.

The fitting portion 22 is formed on the bent surface portions 25 at both ends, and a circular hole 26 having a diameter corresponding to the outer diameter of the rocker shaft 5 is bored, and a part of the circular hole 26 is opened downward. Has been done. The width of the opening 27 is narrowed so as to be smaller than the outer diameter of the shaft. In other words, the fitting portion 22 is configured to surround more than half the outer circumference of the shaft 5.

The abutting portion 23 is integrally formed by projecting from the bridge portion 24 on the radial side of the shaft 5, and is bent downward so that the tip of the abutting portion abuts on the upper portion of the rocker arm 6. There is. Further, in the present embodiment, the center of the bridge portion 24 is formed to be lower stepwise than both end sides, and the bracket contact portion 28 extending to the opposite side to the contact portion 23 is provided. Has been. The bracket abutting portion 28 is formed in a downward arc shape so that the tip of the bracket abutting portion appropriately abuts on the upper surface of the bracket 9.

Next, the operation of this embodiment will be described.

When assembling the valve operating mechanism including the above-mentioned structure, first, the bracket 9 is sandwiched between the adjacent rocker arms 6, and the mounting device of the present invention is put on them, and then the rocker shaft 5 is inserted into the fitting portion 22. Let's make temporary assembly. Alternatively, after the rocker arm 6, the bracket 9 and the rocker shaft 5 are temporarily assembled, the opening 28 of the fitting portion 22 may be elastically widened and fitted into the rocker shaft 5. As a result, the leaf spring member 21 is firmly attached to the rocker shaft 5 without falling off, an appropriate thrust force is applied to the rocker arm 6 at this point, and the axial positioning becomes easy.

Then, as shown in FIG. 2, the contact portion 23 contacts the rocker arm 6 to restrict the rotational movement of the rocker arm 6 at that position. In this embodiment, since the bracket contact portion 28 abuts the bracket 9 on the opposite side at this time, the positioning in the circumferential direction is surely made, and the lower end of the adjusting screw 8 and the upper end receiving portion of the push rod 3 are securely positioned. The positional deviation from 18 can be easily corrected. In other words, assembly failure can be prevented, which can contribute to improvement in the efficiency of assembly work of the valve mechanism.

In a state where the push rod 3 is assembled and used, as shown in FIG. 3, since the push rod 3 moves up and down at a normal position in which the push rod 3 is raised, the contact portion 23 and the rocker arm 6 are moved. A sufficient gap S is secured between the and, so that the rocking of the rocker arm 6 by the camshaft is not hindered. The rocker arm 6 is restrained from sliding in the axial direction by the biasing function of the bent surface portion 25 of the leaf spring member 21.

[0019]

[Effect of the device]

 In short, according to the present invention, the following excellent effects are exhibited.

A leaf spring member that engages with the shaft and restrains the rocker arm in the axial direction is provided, and a fitting portion that surrounds more than half of the outer periphery of the shaft is formed, and the swing range is restricted. Since the rocker arm is formed, the rocker arm can be regulated in the axial direction and the circumferential direction at the stage of temporarily assembling the rocker arm to the shaft, and the assembling failure can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a rocker arm attachment device according to the present invention.

FIG. 2 is a side view for explaining the operation of FIG.

FIG. 3 is a side view for explaining another operation of FIG.

FIG. 4 is a side view showing an OHV type valve operating mechanism for explaining a conventional technique.

FIG. 5 is a side view showing an OHC type valve mechanism for explaining a conventional technique.

FIG. 6 is a top view of FIG.

FIG. 7 is a top view showing another configuration of FIG.

8 is a perspective view showing a leaf spring member in FIG. 7. FIG.

9 is a side view for explaining the operation of FIG.

FIG. 10 is a side view of FIG. 4 for explaining the problems of the conventional technique.

[Explanation of symbols]

 5 rocker shaft (shaft) 6 rocker arm 21 leaf spring member 22 fitting part 23 abutting part

Claims (1)

[Scope of utility model registration request] 1. A rocker arm pivotally supported by a shaft is provided with a leaf spring member that engages with the shaft and restrains the rocker arm in the axial direction thereof, and the leaf spring member has a half of the outer circumference of the shaft. A rocker arm mounting device, characterized in that a fitting portion that surrounds the rocker arm is formed, and a contact portion that abuts on an upper portion of the rocker arm and restricts a swing range thereof is formed.