JPS5840300Y2 - Governor advance device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement of a governor advance device.

In this type of conventional device, a pin is fitted into the governor weight and a hook portion of the spring is engaged with the pin as a locking means between the spring and the governor weight to suppress the governor weight from flying off due to centrifugal force. There is.

However, the hardness of the pin is relatively low due to the caulking process, and therefore the abrasion, especially local abrasion, of the engagement portion with the hook portion is significant.

In order to solve this problem, it is possible to increase the hardness of the pin by hardening or other means, but since the pin is very small, it is difficult to process it.

This invention solves the above-mentioned problem by fitting a bushing freely and rotatably on one side of the pin fitted to the governor weight, engaging the hook part of the spring with this bushing, and attaching the bushing to one side of the pin fitted to the governor weight. By fitting a stopper on the other side to prevent the bushing from coming off, wear on the pin, hook part, and bushing is significantly suppressed, and the advance characteristic of the engine ignition timing is maintained stably over a long period of time. It is located in the governor advance device.

The embodiments shown in FIGS. 1 to 5 will be described below.

In the figure, 1 is the rotating shaft of the power distributor that is rotationally driven by the engine, 2 is a plywood board fixed to this rotating shaft 1, and this base plate 2
A spring retainer portion 4 for retaining the spring 3 is formed in the spring holder.

5 is a spindle fitted to the base plate 2; 6 is a pair of governor weights which are fitted into the spindle 5 and fly apart against the spring force of the spring 3 due to the centrifugal force caused by the rotation of the rotating shaft 1; A pin fitted to the governor weight 6; 8 is a weight pin installed in the governor weight 6; 9 is a guide plate having a guide slot 10 that engages with the weight pin 8; 11 is fixed to the guide plate 9; The cam barrel 11 is fitted into the rotating shaft 1, and a screw for preventing removal from the rotating shaft 1 is screwed into the cam barrel 11.

Reference numeral 12 denotes a cylindrical bushing having an inner diameter that is a size smaller than the outer diameter of the pin 7, and is made of the same material as the pin 7, and is loosely fitted into one side of the pin T so as to be freely rotatable.・Ru.

Note that the hook portion 3a of the spring 3 is engaged with this bush 12.

13 is a stopper that is fitted to the other side of the pin I and prevents the bushing 12 from coming off; 13a, which is integrally molded of synthetic resin, is a recess for fitting into the pin 7;
b is a groove formed in the recess 13a and communicating with the gap between the pin γ and the bush 12.

The operation of this embodiment is such that when the base plate 2 is rotationally driven together with the rotary shaft 1 by the engine, the governor weight 6 rotates and opens with the spindle 5 as a fulcrum against the spring force of the spring 3 due to the centrifugal force.

Due to this flying of the governor weight 6, the guide plate 9 is rotationally displaced in the direction of the arrow via the weight pin 8 and the guide elongated hole 10, and the cam cylinder 11 is thereby rotationally displaced relative to the rotating shaft 1 and the engine The ignition timing of the engine is adjusted.

When the governor weight 6 performs various jump-opening operations to achieve this kind of movement, the spring force of the spring 3 acts on the outer circumference of the pin 7 via the bush 12; It acts not locally on the outer periphery but over a relatively large area.

That is, during the jump-opening operation, the hook portion 3a of the spring 3 and the bush 12 are displaced in the large diameter direction in an integral state in which their engagement state does not change (sliding contact), while the pusher 12 is relatively displaced relative to the pin 7. It is displaced while sliding in contact through a large surface contact area.

Therefore, there is no wear due to engagement between the hook portion 3a of the spring 3 and the bush 12, and wear between the bush 12 and the pin 1 is suppressed as much as possible due to the engagement through surface contact, thereby improving the advance angle characteristics. It can be made stable by simply adding the cylindrical bushing 12.

The device can be made relatively simple and inexpensive.

Furthermore. A stopper 13 is located on the other side of the pin 7 in its recess 13.
Since the bushing 12 is press-fitted through the pin 7a, it is possible to reliably prevent the bushing 12 from coming out of the pin 7 during the operation process.

Here, in order to better prevent wear between the pin 1 and the bushing 12, the recess 13a of the stopper 13 is filled with a lubricant such as grease, and this lubricant is applied to the gap formed by the loose fit between the pin T and the bush 12. Of course, pin 7 and bush 1
Further abrasion protection can be achieved by guiding the material to the sliding contact portion where it makes surface contact with 2.

FIG. 6 shows how the hook portion 3a of the spring 3 is connected to the bush 12.
This is an example in which a receiving portion 12a is formed on the outer periphery of the bushing 12 in order to maintain the softness at a constant level.

By doing so, the hook portion 3a can be securely held on the twig 12, and the integral state becomes stronger.

In FIG. 1, a recess 12b is formed in the bush 12, and a protrusion 13c is formed in the stopper 13.
The bushing 12 and the stopper 13 are fitted into the recess 12b.
In this case, the stopper 13 has no function to prevent it from coming off, but the guide plate 9 prevents it from coming off.

The shape and material of the bushing 12 are cylindrical and made of the same material as the pin I, but the bushing 12 is not limited to this, and may be formed of synthetic resin in a cylindrical shape with a bottom. Any material may be used as long as it can be movably fitted loosely and the hook portion 3a of the spring 3 can be secured.

As described above, in this invention, a bushing is rotatably fitted loosely on one side of the pin fitted to the governor weight, and the hook part of the spring is engaged with this bushing, and then the other side of the pin is rotated. Since the stopper is fitted to the stopper, problems such as local wear of the pin due to the hook part can be reliably prevented, and by using the stopper, problems such as the bush coming out from the pin can be prevented, resulting in improved angle advance characteristics. It has a remarkable practical effect of being able to stably maintain it for a long period of time and minimizing the cost required for it.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of this invention, Fig. 2 is a partially sectional front view of Fig. 1, Fig. 3 is a partial sectional view of the main part, Fig. 4 is a plan view of the main part, FIG. 5 is a perspective view of the stopper 13;
FIG. 6 is a partial sectional view showing the first alternative embodiment, and FIG. 7 is a partial sectional view showing the second alternative embodiment. In the figure, 1 is the rotating shaft, 2 is the plywood, 3 is the spring, 3
a is the hook part, 5 is the spindle, 6 is the governor weight,
7 is a pin, 8 is a weight pin, 9 is a guide plate, 11 is a cam cylinder, 12 is a bush, 13 is a stopper, 13a is a recess,
13b is a groove. Note that the same reference numerals in each figure indicate the same parts.

Claims (4)

[Scope of utility model registration request] (1) A plywood board fixed to a rotating shaft, a governor weight that is rotatably supported by this plywood board and flies against the spring force of a spring due to the centrifugal force caused by the rotation of the rotating shaft to adjust the ignition timing of the engine. , a pin fitted on one side to the governor weight, a bush rotatably and loosely fitted on the pin and engaged with the hook portion of the spring, and a bush fitted on the other side of the pin Governor advance device equipped with a stopper to prevent the fish from coming off. (2) Utility Model Registration The governor advance device according to claim 1, wherein a concave portion for receiving a hook portion of a spring is formed on the outer periphery of the bushing. (3) A governor advance device according to claim 1 or 2, in which a grease reservoir is formed in the loose fitting portion between the bushing and the pin. (4) In the utility model registered as described in claims 1 to 3, a grease reservoir is formed in the stopper, and the grease reservoir and the loosely fitted portion between the bushing and the pin are A governor advance device formed with a groove that communicates with the reservoir.