JPH0530402U - Valve spring device for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] In the valve spring device of an internal combustion engine, in which the valve split is fixed to the valve stem by a split collar that the upper seat holds with its tapered inner circumference, the surging of the valve spring, etc. This prevents the upper seat from coming off the split collar and the split collar from falling off. [Structure] An annular groove 6 in the circumferential direction is formed face-to-face with each of the tapered inner circumference of the upper sheet 2a and the tapered outer circumference of the split collar 1a in contact with the upper seat 2a. A flexible retaining ring 7 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a valve spring device for an internal combustion engine.

[0002]

[Prior Art]

 The valve spring of an internal combustion engine is generally fixed to the head of the valve stem 4 by a split collar 1 which is held by the upper seat 2 at its tapered inner circumference as shown in FIG. 13373 publication etc.).

In that case, the split collar 1 is easily attached by sandwiching the split collar 1 from both sides on the head of the stem 4 and fitting it into the groove on the outer circumference of the head, and holding the tapered outer circumference by the upper seat 2. Not only does it withstand the extreme expansion and contraction of the valve, but it also allows rotational movement to average out wear on the valve face. Reference numeral 5 indicates a rocker arm.

[0004]

[Problems to be solved by the device]

 However, in such a conventional example, when the set force of the valve spring 3 that holds the taper connection between the upper seat 2 and the split collar 1 is lost due to surging or the like, the upper seat 2 comes off the split collar 1. Split Color 1 could fall out.

[0005]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention proposes a valve spring device for an internal combustion engine in which a valve spring is fixed to a valve stem by a split collar that an upper sheet holds in its tapered inner circumference. Circumferential annular grooves are formed facing each other on the tapered inner circumference of the seat and the tapered outer circumference of the split collar that is in contact with the seat, and a flexible retaining ring that fits over these annular grooves is provided. It is a thing.

[0006]

[Action]

 According to this, even when the valve spring loses the setting force due to surging, etc., the retaining ring tries to maintain the taper connection between the upper seat and the split collar, and therefore the upper seat rarely comes off from the split collar. Become That is, it is possible to effectively prevent the split collar from coming off.

Further, since the retaining ring has flexibility, it can be removed from the split collar when replacing the upper sheet, for example.

[0008]

【Example】

 In FIG. 1, 4 is a valve stem, 3 is a valve spring, 2a is an upper sheet, 1a is a split collar, and the split collar 1a is sandwiched from both sides in the head outer peripheral groove of the stem 4 as in the conventional case, and the taper outer periphery is It is fixed by fitting the upper sheet 2a. Reference numeral 5 indicates a rocker arm.

In this case, circumferential annular grooves 6 are formed facing each other on the tapered inner circumference of the upper sheet 2 a and the tapered outer circumference of the split collar 1 a that is in contact with the upper seat 2 a. A flexible retaining ring 7 that fits over is provided.

According to this structure, even when the valve spring 3 loses its setting force due to surging or the like, the retaining ring 7 tries to maintain the taper coupling between the upper seat 2a and the split collar 1a, and thus the upper seat 2a. Is almost never disengaged from the split collar 1a, and the split collar 1a can be effectively prevented from falling off.

Further, since the retaining ring 7 is flexible, when the upper seat 2a is replaced, it is compressed and deformed by pushing it down in the direction in which the valve spring 3 is bent. Therefore, the upper seat 2a is separated from the split collar 1a. It can also be removed.

The retaining ring 7 is preferably made of rubber, but may be a C-shaped ring made of metal and capable of reducing the diameter, or may be made of a shape memory alloy capable of reducing the diameter of the C-shaped ring at room temperature. good.

[0013]

[Effect of the device]

 In summary, according to the present invention, in the valve spring device of the internal combustion engine, in which the valve spring is fixed to the valve stem by the split collar that the upper seat holds on the inner periphery of the taper, the tapered shape of the upper seat is used. Circular annular grooves are formed facing each other on the inner circumference and the tapered outer circumference of the split collar that is in contact with the inner circumference, and a flexible retaining ring that fits over these annular grooves is provided. Even if the upper seat does not come off from the split collar due to the surging of the spring, the split collar can be effectively prevented from falling off. In addition, the retaining ring of the upper seat and split collar has flexibility, so it is possible to disassemble when replacing parts.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 1a Split collar 2a Upper seat 3 Valve spring 4 Valve stem 6 Annular groove 7 Lock ring

Claims (1)

[Scope of utility model registration request] 1. A valve spring device for an internal combustion engine, wherein a valve spring is fixed to a valve stem by a split collar that an upper seat holds with its tapered inner circumference. An annular groove in the circumferential direction is formed on each of the tapered outer circumferences of the split collars that are in contact with each other, and a flexible retaining ring that fits over these annular grooves is provided. Valve spring device.