JPH0318145Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve spring attachment/detachment tool for an internal combustion engine that can be used for replacing valve springs, etc. when repairing internal combustion engine valves and valve devices.

Conventionally, as an example of a valve spring attachment/detachment tool for an internal combustion engine, the invention of Japanese Utility Model Publication No. 55-46446 has been proposed. That is, the invention comprises a lever, a tool engaging part provided at the front end of the lever, and a valve spring receiver pressing part provided at the center of the lever so as to be slidable relative to the lever. However, the attachment/detachment tool according to this invention utilizes the through-mounting hole formed in the valve box, and the
The tool engaging part, which consists of an eccentric fixed cylinder and an eccentric movable cylinder, is engaged with the lower edge in an aligned state, and then the lever is rotated for use. It had drawbacks.

This invention can only be used for engines in which a through hole is formed in the valve box, and therefore the tool itself is not versatile. Further, it is inconvenient because it is necessary to replace the engaging portion of the tool with one that corresponds to the diameter of the mounting hole of the valve box.

The engagement part includes a support rod, a fixed cylinder attached to the tip of the support rod, a spring receiver fixed to the center of the support rod, and an engagement arm provided between the spring receiver and the fixed cylinder. The tool is expensive because it is composed of various parts such as a moving cylinder and a spring interposed between the moving cylinder and the spring receiver.

Since the valve spring pressing part is also made up of a plurality of parts such as a position adjustment screw, a support bracket, and a spring retainer, the tool itself has a complicated structure in combination with the above-mentioned engaging part.

To position the spring retainer of the valve spring presser on the spring retainer of the valve stem, first loosen the position adjustment screw, then move the valve spring presser to the desired position, and then tighten the position adjustment screw. There must be. Therefore, adjustment operations cannot be performed with a single touch.

The present invention was devised in view of the above-mentioned circumstances, and it increases the versatility of the tool itself, makes the structure more compact and can be manufactured at low cost, and also allows for easy movement and adjustment of the valve spring holding member. It is possible to obtain a valve spring removal and removal tool for internal combustion engines, etc.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In one embodiment shown in FIGS. 1 to 5, A
1 is a front view of a tool body, which includes a generally plate-shaped lever 1 and an arm-shaped hook member 2 pivotally attached to the tip of the lever 1 and having an engaging pawl at the lower end.
and a spring presser member 3 attached to the lever 1 whose position can be adjusted with reference to the hook member 2. That is, a mounting hole 4 for a hook member 2 is bored at the tip end (right side in FIG. 1) of the lever 1 (see FIGS. 2 and 4), while a gripping section 5 is formed at the rear end. Furthermore, an adjustment elongated hole 6 having a required length is formed in the side wall of the lever 1 between the grip portion 5 and the mounting hole 4 in the longitudinal direction of the lever. Reference numeral 7 denotes a plurality of approximately semicircular holes formed above the adjustment slot 6 (upper side in FIG. 1) and at required intervals in the longitudinal direction of the lever 1. Each of these engaging grooves 7 is integrally connected to the adjustment slot 6 as shown in the figure. As shown in FIG. 4, 8 is a through bolt passed through the mounting hole 4 of the lever 1, and the through bolt 8 has a head 8a at one end and a male threaded portion 8b of the through bolt at the other end. , a nut 9 is screwed onto the male threaded portion 8b. 10 and 11 are the side walls of the tip of the lever 1 and the left and right hook members 2 in FIG.
A ring-shaped guide member inserted in each
The guide members 10 and 11 are each rotatably mounted around the through bolt 8 at positions near both ends thereof. In this embodiment, a pair of hook members 2 are provided facing each other. That is, the left and right pair of hook members 2 are pivotally attached to the ends of the through bolts 8 via guide members 10 and 11, and each hook member 2 has an arm 2a and a lower end of the arm bent inward. The arm 2a is comprised of a plurality of adjustment holes 2c that are formed in the arm 2a at predetermined intervals sequentially downward from the upper end of the arm. Next, as shown in FIG. 3, the spring holding member 3 described above has a through bolt 12 having a diameter large enough to move back and forth within the adjustment slot 6, and a fourth bolt.
Similar to the guide member shown in the figure, it is rotatably mounted around the through bolt 12 at positions near both ends thereof, and the side walls 1a, 1b of the lever 1 and the pair of left and right arms 13,
ring-shaped sliding parts 14, each sandwiched between 13;
15, and an annular portion 17 having an opening 16 large enough for a finger to be fixed to the lower ends of the pair of opposing left and right arms by welding or the like, and the through bolt 12 also has a through hole for pivotally attaching the hook member. It has the same structure as the bolt 8, and has a nut-shaped head 12a at one end and a nut 18 screwed onto the other end. Also, the upper large diameter portions 13', 1 of the left and right arms 13, 13
Similar to the arm 2a of the hook member 3', a plurality of adjustment holes 19 are formed at predetermined intervals sequentially downward from the upper end.

Next, how to use the tool body A will be explained with reference to FIG. When removing the valve controller 21 provided at the upper end of the valve guide 20 and performing disassembly work such as replacing the valve spring 22, first remove the hook member 2 according to the engine specifications.
The length to the camshaft or rocker shaft is set using either the adjustment hole 2c as a reference. For example, in an engine in which the cylinder head 23 is provided with a support base 25 for a plurality of rocker shafts 24, 24a as in this embodiment, an adjustment hole formed at the top of the hook member 2 is used to As shown in the figure, the hook member 2 is pivotally attached to the lever 1 with a through bolt 8. On the other hand, the length of the spring presser member 3 is such that the annular portion 17 of the spring presser member 3 can be placed directly on the spring retainer 26, and the lever 1 is moved from the chain line to the solid line (arrow B) as shown. At this point, select the adjustment hole 19 that seems to be just right, in this embodiment the uppermost adjustment hole, and pivot it to the lever 1 via the adjustment elongated hole 6 with a bolt 12 through the spring presser member 3. After that, the hook member 2 is locked to a suitable rocker shaft 24, and while gripping the grip part of the lever 1 with one hand and grasping an appropriate part of the spring presser member with the other hand, move the presser member 3 in the direction of arrow C. The annular portion 17 is moved onto the spring retainer 26 of the valve 27. When the tool body A is thus set as shown in Fig. 5 and the grip part of the lever 1 is pushed down, the lever 1 acts as a screw with the through bolt 8 inserted through its tip as a fulcrum, and the spring holding member 3 The through bolt 12 is inserted into the engagement groove 7
The spring retainer 26 is stabilized by engaging with the valve spring 22, and the spring retainer 26 is pressed down against the valve spring 22 by the spring presser member 3.
The split-structure valve protector 21 can be removed from the opening 16 of the annular portion 17 or the like. Once the valve retainer 21 is removed, the spring retainer 26, valve spring 22, etc. can be disassembled.

As is clear from the above description, the present invention provides excellent practical effects as listed below.

(1) Multiple adjustment holes are provided in the arm of the hook member and spring retainer, and a long adjustment hole is formed in the lever, so the length of the hook member or spring retainer can be adjusted to suit the specifications of various engines. Can be adjusted. Therefore, the versatility of the tool itself can be increased.

(2) The spring holding member is suspended by a through bolt customarily installed in the adjustment slot of the lever, and is connected to the adjustment length via a sliding part interposed between the side wall of the lever and the arm 13. Since it moves within the hole, it can be moved easily and smoothly with one hand. Therefore, positioning is easy and work efficiency is improved.

(3) Since a plurality of engagement grooves are formed in the adjustment slot of the lever, when the tool body is set as shown in Fig. 5 and the lever is pushed down, the through bolt engages with the engagement groove. Therefore, it is possible to prevent the spring pressing member from tilting.

(4) Since the number of parts that make up the tool body is small,
It can be manufactured at low cost, and is not bulky because the hook member and spring presser member can be folded during volatilization.

Since the hook member 2 is formed into an arm shape with an engaging claw 2b at the lower end, the hook member is engaged with the rocker shafts 24, 24a as appropriate.
Even the last remaining valve spring 22 can be removed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a plan view, Fig. 3 is a perspective view of a spring pressing member, and Fig. 4 shows a hook member at the tip of the lever. FIG. 5 is a schematic cross-sectional view showing the installed state, and FIG. 5 is a front view showing the tool body A in use. A...Tool body, 1...Lever, 1a, 1b...
...Lever side wall, 2...Hook member, 3...Spring pressing member, 4...Mounting hole, 5...Gripping part,
6... Adjustment slot, 7... Engagement groove, 8, 12... Through bolt, 9, 18... Nut, 10, 11...
Guide member, 2a, 13... Arm, 2b... Engaging claw, 2c, 19... Adjustment hole, 14, 15... Sliding part, 17... Annular part, 21... Valve cockter, 22... Valve spring , 23... cylinder head, 24, 24a... rocker shaft,
25...Support part, 26...Spring retainer, 27...Valve.

Claims (1)

[Scope of utility model registration request] A lever having a grip, an arm-shaped hook member pivotally attached to the tip of the lever and having an engaging claw at the lower end, and a spring retainer suspended from the lever so that its position can be adjusted with reference to the hook member. a member, the lever is provided with an adjustment elongated hole having a plurality of engagement grooves formed at predetermined intervals;
In addition, each arm of the hook member and spring presser member has a plurality of pieces arranged at required intervals from above so that the lengths of the hook member and spring presser member can be adjusted in accordance with the specifications of various engines. A valve spring attachment/detachment tool for an internal combustion engine, characterized in that the spring holding member is provided on the lever via a sliding portion interposed between the side wall of the lever and the arm.