JP4167996B2 - Advance device for cold start of engine eccentric cam type mechanical timer - Google Patents

Description

  The present invention relates to an advance device for starting a cold engine of an eccentric cam type mechanical timer of an engine.

[Prerequisite configuration]
As shown in FIG. 3 (present invention) or FIG. 5 (prior art), the advance angle device at the time of cold start of the eccentric cam type mechanical timer of the engine of the present invention is intended for the one having the following premise configuration. To do.

  FIG. 3 shows Embodiment 1 of the advance device at the time of cold start of the eccentric cam type mechanical timer of the engine of the present invention. 3A is a vertical right side view of the eccentric cam type mechanical timer, FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A, and FIG. 3C is C of FIG. 3A. FIG.

  FIG. 5 shows an advance device at the time of cold start of the eccentric cam type mechanical timer of the engine of the prior art 1. FIG. 5A is a longitudinal left side view of the eccentric cam type mechanical timer, and is a cross-sectional view taken along line AA of FIG. 5B. FIG. 5B is a longitudinal sectional front view of the center of FIG.

An output wheel (2) is arranged on one side of the input wheel (1) constituting the eccentric cam type mechanical timer of the engine, and a pair of centrifugal weights (3) (3) is arranged on the other side.
An eccentric cam type advance mechanism (4) is provided over the input wheel (1) and the output wheel (2). The eccentric cam type advance mechanism (4) is operated by an unbalanced force between the centrifugal force of the pair of centrifugal weights (3) and (3) and the tension to the centripetal side of the weight return spring (5) made of a compression coil spring. Thus, the output wheel (2) is configured to advance and operate with respect to the input wheel (1).

  The pair of centrifugal weights (3) and (3) are driven to advance in the centrifugal direction by a starting advance spring (6) made of a compression coil spring, whereas the temperature sensing means (7) has a high temperature side temperature sensing. The advance drive is released against the tension of the starting advance spring (6) by the extension operation at that time.

  When the engine is cold-started, as shown in FIG. 4A, the temperature-sensing operation means (7) is contracted by the low-temperature side temperature sensing, and a pair of centrifugal weights are applied by the tension of the starting advance spring (6). (3) It is configured to expand (3) to the starting advance position.

  When the engine is warm, as shown in FIG. 4B, the temperature sensing means (7) is extended by the high temperature side temperature sensing, and the starting advance spring (6) is contracted, and this starting advancement is performed. The angular spring (6) is configured to release the pair of centrifugal weights (3) and (3) from being pushed and expanded to the starting advance position.

[Conventional technology]
In the above premise structure, as a structure for combining the starting advance spring (6) and the temperature sensitive operation means (7), there is one shown in FIG.
(Japanese Patent Laid-Open No. 3-11131)

  FIG. 5 shows an advance device at the time of cold start of the eccentric cam type mechanical timer of the prior art engine. FIG. 5A is a longitudinal left side view of the eccentric cam type mechanical timer, and is a cross-sectional view taken along line AA of FIG. 5B. FIG. 5B is a longitudinal sectional front view of the center of FIG.

  The temperature sensitive operating means (7) comprises a wax-sealed temperature sensitive actuator (50). A conical hole cam surface (51) is formed in the front half of the inner peripheral surface (53) of the pair of centrifugal weights (3) and (3). The centrifugal cams (3) and (3) are configured to be expanded to the starting advance position by pressing the conical cam (52) against the conical hole cam surface (51) with the tension of the starting advance spring (6). Has been.

[Problems of conventional technology]
The above prior art has the following problems.
The conical cam (52) and the conical hole cam surface (51) slide during the transmission of the force between the starting advance spring (6) and the centrifugal weights (3) and (3), resulting in friction loss. There are the following problems 1 and 2 and 3 as much as they occur.

Problem 1: The control accuracy of the starting advance angle at the time of engine cold start decreases.
Problem 2: The temperature sensitive actuator (50) and the starting advance spring (6) require large capacity and small size.

  Problem 3: The conical cam (52) and the conical hole cam surface (51) interposed in the force transmission part from the starting advance spring (6) to the centrifugal weight (3) (3) are worn by sliding friction. Therefore, durability is reduced.

Japanese Patent Laid-Open No. 3-11131

An object of the present invention is to do as follows.
[I]. The amount of friction loss is eliminated during the transmission of the force between the spring for starting advance angle and both centrifugal weights. The advance angle spring and the temperature-sensitive operation means can be reduced in size and size. 3: The durability of the force transmission portion from the start advance angle spring to the centrifugal weight is improved.

  [B]. By arranging the shape memory spring and the starting advance spring concentrically with respect to the weight return spring, the length of the centrifugal weight in the rotational axis direction is shortened.

  [D]. The shape memory spring and the starting advance spring reduce the rate of change of the spring tension with respect to the amount of spring expansion and contraction, thereby increasing the control accuracy of the starting advance angle during the cold start of the eccentric cam type mechanical timer.

  [E]. In addition to increasing the control accuracy of the start angle at the time of cold start of the eccentric cam type mechanical timer, the durability of the start angle advance spring and the shape memory spring is increased.

  In order to solve the above-mentioned problems, the advance angle device at the time of cold start of the eccentric cam type mechanical timer of the engine according to the present invention is, for example, as shown in FIGS. As a configuration for combining the spring (6) and the temperature sensitive operation means (7), the following characteristic configuration is added.

The temperature sensitive operating means (7) is constituted by a shape memory spring (8) made of a shape memory alloy material for a compression coil spring.
The shape memory spring (8) and the starting advance spring (6) are positioned between the pair of centrifugal weights (3) and (3), and with respect to the weight return spring (5). Concentric arrangement .

Of the pair of centrifugal weights (3) and (3), one of the centrifugal weights (3) is provided with a weight return spring (5), whereas the other centrifugal weight (3) is provided with the inside. Is provided with a starting advance spring (6) and a shape memory spring (8) .

The constructed by arranging by inserted the one inside the other and the shape memory and starting advancing spring springs (8) (6).

A transmission cylinder (9) is inserted between the shape memory spring (8) and the start-advance spring (6) which are fitted in and out of each other. Against the cylindrical end portion of the power transmission tube (9) cause Rendesa the outer flange (10) on the outer side, thereby Rendesa the inner flange (11) on the inner side from the cylindrical other end.

  The other centrifugal weight (3) of the pair of centrifugal weights (3) and (3) is made to receive the spring base short part (12) of the starting advance spring (6), and this starting advance angle. The spring tip (13) of the spring (6) is configured to press the one centrifugal weight (3) to the centrifugal side via the outer rod (10).

A weight opening / closing guide shaft (14) is inserted into the pair of centrifugal weights (3), (3), and one end side spring retainer (14a) is attached to one end of the weight opening / closing guide shaft (14) in one centrifugal weight (3). ), The weight return spring (5) in one centrifugal weight (3) is received by this one end side spring retainer (14a), and the weight opening / closing guide shaft (14) on the other centrifugal weight (3) side is received. A weight retaining retainer (14b) is provided at the end, and the weight retaining retainer (14b) is used to stop the other centrifugal weight (3) from coming out of the weight opening / closing guide shaft (14) in the centrifugal direction. An intermediate spring retainer (14c) is provided in the intermediate portion of the weight opening / closing guide shaft (14) in the transmission cylinder (9) of the centrifugal weight (3), and the shape memory spring (8) is provided by the intermediate spring retainer (14c). spring base end let receiving (15), let received on the inner flange of the spring tip of the shape memory spring (8) (16) the power transmission cylinder (9) (11), the shape memory spring (8) The spring tip (16) is configured to repress the starting advance spring (6) toward the compression side through the inner rod (11), the transmission cylinder (9), and the outer rod (10) in this order. It is characterized by that.

The advance device at the time of cold start of the eccentric cam type mechanical timer of the engine of the present invention has the following effects. (Refer to Fig. 1 to Fig. 4)

[Effect a. As much as there is no friction loss in the middle of the transmission of force between the starting advance spring (6) and the centrifugal weights (3) (3). The angle control accuracy is improved. Effect 2: The starting advance spring (6) and the shape memory spring (8) can be reduced in capacity and size. Effect 3: From the starting advance spring (6) to the centrifugal weight ( 3) The durability of the force transmission part up to (3) is improved. ]

The present invention has the following characteristic configuration.
The temperature sensitive operating means (7) is constituted by a shape memory spring (8) made of a shape memory alloy material for a compression coil spring.
The shape memory spring (8) and the starting advance spring (6) are positioned between the pair of centrifugal weights (3) and (3), and with respect to the weight return spring (5). Concentric arrangement.

  From this characteristic configuration, when the engine is cold-started, as illustrated in FIG. 4A, the shape memory spring (8) is contracted, and a pair of centrifugal weights ( 3) Push (3) to the starting advance angle position, and as shown in FIGS. 1 and 3, the fuel injection timing of the fuel injection pump (19) is set to advance for cold start via the advance mechanism (4). Advance to the angular position.

  At this time, since the spring for advancing angle (6) is pressed directly against the centrifugal weights (3) and (3) in the centrifugal direction, it is possible to eliminate friction loss during the transmission of the force. The following effects 1 and 2 and 3 could be achieved as much as this friction loss was eliminated.

Effect 1: The control accuracy of the starting advance angle at the time of cold start of the engine is improved by the amount that the friction loss during the transmission of the force is eliminated.
Effect 2: The starting advance spring (6) and the shape memory spring (8) can be reduced in capacity and size as much as the friction loss during the transmission of the force is eliminated.

  Effect 3: The transmission portion of the force from the starting advance spring (6) to the centrifugal weight (3) (3) is less worn and the durability is improved as much as there is no friction loss.

  [Effect b. The shape memory spring (8) and the start-advance spring (6) need not be displaced in the rotational axis direction of the centrifugal weights (3) and (3) with respect to the weight return spring (5). The length of the centrifugal weights (3) and (3) is shortened, which contributes to shortening the total length of the eccentric cam type mechanical timer. ]

  As illustrated in FIGS. 1 and 4, the shape memory spring (8) and the starting advance spring (6) are positioned between the centrifugal weights (3) and (3) with respect to the weight return spring (5). The length of the centrifugal weights (3) and (3) in the direction of the rotational axis is shortened by the amount that the centrifugal weights (3) and (3) need not be displaced in the direction of the rotational axis. Thus, the overall length of the eccentric cam type mechanical timer can be reduced.

  [Effect C. The length of the centrifugal weights (3) and (3) is further shortened by the amount that can reduce the maximum outer diameter of the weight return spring (5), starting advance spring (6), and shape memory spring (8). Contributes to shortening the overall length of the eccentric cam type mechanical timer. ]

The present invention has the following characteristic configuration.
Of the pair of centrifugal weights (3) and (3), one of the centrifugal weights (3) is provided with a weight return spring (5), whereas the other centrifugal weight (3) is provided with the inside. Is provided with a starting advance spring (6) and a shape memory spring (8).

  Because of this characteristic configuration, the weight return spring (5), the starting advance spring (6), and the shape memory spring (8) need only be inserted into and out of the three springs (5). (6) The length of the centrifugal weights (3) and (3) can be shortened by the amount that the maximum spring outer diameter of (8) can be reduced, thereby contributing to the shortening of the total length of the eccentric cam type mechanical timer. .

  [Effects d. The shape memory spring (8) and the starting advance spring (6) reduce the rate of change of spring tension with respect to the amount of spring expansion and contraction by the amount that each spring length can be increased, thereby cooling the eccentric cam type mechanical timer. Increase the control accuracy of the lead angle at the start. ]

The present invention has a characteristic configuration described below.
The shape memory spring (8) and the starting advance spring (6) were inserted in and out of each other.

  Because of this characteristic configuration, the shape memory spring (8) and the starting advance spring (6) are inserted into each other and inserted into each other, so that the springs (8) and (6) of each spring (8) and (6) are compared with each other. As the spring length can be increased, the rate of change of spring tension with respect to the amount of spring expansion and contraction can be reduced, and the advance angle control accuracy at the time of cold start of the eccentric cam type mechanical timer can be increased.

  [Effect E. The starting advance spring (6) and the shape memory spring (8) can be accurately and stably balanced through the transmission cylinder (9). In addition, interference between the springs (6) and (8) is prevented by the transmission cylinder (9) to improve the control accuracy and stability of the advance angle at the time of cold start of the eccentric cam type mechanical timer. Prevents wear of the springs (6) and (8) to increase durability. ]

The present invention has the following characteristic configuration.
A transmission cylinder (9) is inserted between the shape memory spring (8) and the start-advance spring (6) which are fitted in and out of each other. Against the cylindrical end portion of the power transmission tube (9) cause Rendesa the outer flange (10) on the outer side, thereby Rendesa the inner flange (11) on the inner side from the cylindrical other end.

  The other centrifugal weight (3) of the pair of centrifugal weights (3) and (3) is made to receive the spring base short part (12) of the starting advance spring (6), and this starting advance angle. The spring tip (13) of the spring (6) is configured to press the one centrifugal weight (3) to the centrifugal side via the outer rod (10).

  The other centrifugal weight (3) receives the spring base end portion (15) of the shape memory spring (8) via the weight opening / closing guide shaft (14), and the tip end portion of the shape memory spring (8) ( 16) is configured to repress the starting advance spring (6) toward the side to be compressed through the inner rod (11), the transmission cylinder (9), and the outer rod (10) in this order.

  Due to this characteristic configuration, the starting advance spring (6) and the shape memory spring (8) are accurately and stably passed through the outer casing (10), the transmission cylinder (9) and the inner casing (11) in this order. Can be balanced and operated. In addition, since the interference between the springs (6) and (8) can be prevented by the transmission cylinder (9), the control accuracy and stability of the advance angle at the time of cold start of the eccentric cam type mechanical timer are improved. In addition, the wear of both springs (6) and (8) can be prevented and the durability can be enhanced.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an advance angle device at the time of cold start of an eccentric cam type mechanical timer for an engine according to the present invention will be described below with reference to the drawings.

1 to 4 show Embodiment 1 of an advance device at the time of cold start of an eccentric cam type mechanical timer of an engine of the present invention. FIG. 1 shows a centrifugal weight of an eccentric cam type mechanical timer in which a weight returning spring, a spring for starting advancement, and a temperature sensitive operating spring are incorporated. 1A is a cross-sectional front view taken along line AA of FIG. 1B, FIG. 1B is a plan view, FIG. 1C is a left side view, and FIG. 1D is FIG. It is the DD sectional view taken on the line.

  FIG. 2 is a vertical right side view of a drive unit for a fuel injection pump of a water-cooled vertical diesel engine. 3A is a vertical right side view of the eccentric cam type mechanical timer, FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A, and FIG. 3C is C of FIG. FIG.

  FIG. 4 is an enlarged view of a portion IV in FIG. FIG. 4A shows a contraction operation state when the shape memory spring is sensed on the low temperature side. FIG. 4B shows an extension operation state at the time of temperature sensing of the shape memory spring.

  In FIG. 2, reference numeral (19) is a fuel injection pump, (20) is an eccentric cam type mechanical timer, (21) is a fuel injection cam gear, (22) is a timer input shaft, and (23) is a cylindrical fuel injection cam. Is the axis. The power of the engine crankshaft (not shown) is transmitted from the fuel injection cam gear (21) to the fuel injection camshaft (23) via the timer input shaft (22) and the eccentric cam type mechanical timer (20).

The eccentric cam type mechanical timer (20) is configured as follows.
As shown in FIGS. 1 and 3, an output wheel (2) is provided on one side of an input wheel (1) constituting an eccentric cam type mechanical timer of the engine, and a pair of centrifugal weights (3) ( 3) is arranged.

  An eccentric cam type advance mechanism (4) is provided over the input wheel (1) and the output wheel (2). The eccentric cam type advance mechanism (4) is operated by an unbalanced force between the centrifugal force of the pair of centrifugal weights (3) and (3) and the tension to the centripetal side of the weight return spring (5) made of a compression coil spring. Thus, the output wheel (2) is configured to advance and operate with respect to the input wheel (1).

  The pair of centrifugal weights (3) and (3) are driven to advance in the centrifugal direction by a starting advance spring (6) made of a compression coil spring, whereas the temperature sensing means (7) has a high temperature side temperature sensing. The advance drive is released against the tension of the starting advance spring (6) by the extension operation at that time.

  At the time of engine cold start, as shown in FIG. 4 (A), the temperature sensing means (7) is contracted by the low temperature side temperature sensing, and a pair of centrifugal weights ( 3) (3) is configured to expand to the starting advance position.

  When the engine is warm, as shown in FIG. 4B, the temperature-sensing operation means (7) is extended by the high-temperature side temperature sensing, and the start-advance spring (6) is contracted, and this start-advance angle The spring (6) is configured to release the pair of centrifugal weights (3) and (3) from being pushed and expanded to the starting advance position.

The eccentric cam type advance mechanism (4) is well known and is configured as follows.
As shown in FIG. 3, a large-diameter eccentric ring (25) and a small-diameter eccentric ring (27) are sequentially fitted in the input ring (1). A pair of large ring pivot support holes (24) are opened at two point-symmetrical eccentric positions of the input wheel (1). A pair of large-diameter eccentric rings (25) are fitted into the large-ring support holes (24), and are rotatably supported. Each small wheel pivot support hole (26) is opened at an eccentric position of each large diameter eccentric ring (25). A pair of small ring eccentrics (27) are fitted in each small ring pivot support hole (26) and pivotally supported rotatably.

  Each eccentric input pin (28) of each large-diameter eccentric ring (25) is connected by being fitted into each pair of centrifugal weights (3). Each eccentric output pin (29) of each small wheel eccentric wheel (27) is connected to the output wheel (2) by being fitted inside.

  The cylindrical shaft portion (41) of the input wheel (1) is fitted on the timer input shaft (22), fixed to the timer input shaft (22) with a nut (31), and rotated integrally with the key. It is connected. The output wheel (2) is externally fitted to the fuel injection cam shaft (23) and is connected so as to rotate integrally with a key.

  As shown in FIGS. 1 and 4, the temperature-sensing operation means (7) is composed of a shape memory spring (8) made of a shape memory alloy material and a compression coil spring. The shape memory spring (8) and the starting advance spring (6) are positioned between the pair of centrifugal weights (3) and (3), and with respect to the weight return spring (5). Place them concentrically.

  Of the pair of centrifugal weights (3) and (3), one of the centrifugal weights (3) is provided with a weight return spring (5), whereas the other centrifugal weight (3) is provided with the inside. Are provided with a starting advance spring (6) and a shape memory spring (8). The shape memory spring (8) and the starting advance spring (6) are inserted in and out of each other.

A transmission cylinder (9) is inserted between the shape memory spring (8) and the start-advance spring (6) which are fitted in and out of each other. Against the cylindrical end portion of the power transmission tube (9) cause Rendesa the outer flange (10) to a centrifugal outward, the inner flange (11) to Rendesa centripetally in side from the cylindrical other end.

  The other centrifugal weight (3) of the pair of centrifugal weights (3) and (3) is made to receive the spring base end portion (12) of the starting advance spring (6), and this starting advance angle The spring tip (13) of the spring (6) is configured to press the one centrifugal weight (3) to the centrifugal side via the outer rod (10).

A weight opening / closing guide shaft (14) is inserted into the pair of centrifugal weights (3), (3), and one end side spring retainer (14a) is attached to one end of the weight opening / closing guide shaft (14) in one centrifugal weight (3). ), The weight return spring (5) in one centrifugal weight (3) is received by this one end side spring retainer (14a), and the weight opening / closing guide shaft (14) on the other centrifugal weight (3) side is received. A weight retaining retainer (14b) is provided at the end, and the weight retaining retainer (14b) is used to stop the other centrifugal weight (3) from coming off from the weight opening / closing guide shaft (14) in the centrifugal direction. An intermediate spring retainer (14c) is provided in the intermediate portion of the weight opening / closing guide shaft (14) in the transmission cylinder (9) of the centrifugal weight (3), and the shape memory spring (8) is provided by the intermediate spring retainer (14c). spring base end let receiving (15), let received on the inner flange of the spring tip of the shape memory spring (8) (16) the power transmission cylinder (9) (11), the shape memory spring (8) The spring tip (16) is configured to repress the starting advance spring (6) toward the compression side through the inner rod (11), the transmission cylinder (9), and the outer rod (10) in this order. Is.

  The advance angle device at the time of cold start of the eccentric cam type mechanical timer of the engine of the present invention is suitable, for example, as the advance angle device at the time of cold start of the eccentric cam type mechanical timer used in a diesel engine.

1 to 4 show Embodiment 1 of an advance device at the time of cold start of an eccentric cam type mechanical timer of an engine of the present invention. FIG. 1 shows a centrifugal weight of an eccentric cam type mechanical timer in which a weight returning spring, a spring for starting advancement, and a temperature sensitive operating spring are incorporated. 1A is a cross-sectional front view taken along line AA of FIG. 1B, FIG. 1B is a plan view, FIG. 1C is a left side view, and FIG. 1D is FIG. It is the DD sectional view taken on the line.

FIG. 2 is a vertical right side view of a drive unit for a fuel injection pump of a water-cooled vertical diesel engine. 3A is a vertical right side view of the eccentric cam type mechanical timer, FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A, and FIG. 3C is C of FIG. FIG. FIG. 4 is an enlarged view of a portion IV in FIG. FIG. 4A shows a contraction operation state when the shape memory spring is sensed on the low temperature side. FIG. 4B shows an extension operation state at the time of temperature sensing of the shape memory spring.

FIG. 5 shows an advance device at the time of cold start of the eccentric cam type mechanical timer of the prior art engine. FIG. 5A is a longitudinal left side view of the eccentric cam type mechanical timer, and is a cross-sectional view taken along line AA of FIG. 5B. FIG. 5B is a longitudinal sectional front view of the center of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Input wheel, 2 ... Output wheel, 3 ... Centrifugal weight, 4 ... Eccentric cam type advance mechanism, 5 ... Weight return spring, 6 ... Spring for starting advance, 7 ... Temperature-sensing operation means, 8 ... Shape memory spring , 9 ... Transmission cylinder, 10 ... Outer rod, 11 ... Inner rod, 12 ... Spring proximal end, 13 ... Spring distal end, 14 ... Weight opening / closing guide shaft, 15 ... Spring proximal short portion, 16 ... Spring distal end.

Claims (1)

An output wheel (2) is arranged on one side of the input wheel (1) constituting the eccentric cam type mechanical timer of the engine, and a pair of centrifugal weights (3) (3) are arranged on the other side,
An eccentric cam type advance mechanism (4) is provided over the input wheel (1) and the output wheel (2), and this eccentric cam type advance mechanism (4) is composed of a pair of centrifugal weights (3) (3). Actuated by the unbalanced force between the centrifugal force and the tension to the centripetal side of the weight return spring (5) made of compression coil spring, so that the output wheel (2) is controlled to advance the input wheel (1). To configure
The pair of centrifugal weights (3) and (3) are driven to advance in the centrifugal direction by a starting advance spring (6) made of a compression coil spring, whereas the temperature sensing means (7) has a high temperature side temperature sensing. It is configured to release the advance drive against the tension of the starting advance spring (6) by the extension operation at the time,
At the time of engine cold start, the temperature sensing means (7) is contracted by the low temperature side temperature sensing, and the pair of centrifugal weights (3) (3) are moved to the starting advance position by the tension of the start advance spring (6). Configured to spread
When the engine is warm, the temperature-sensing operation means (7) is extended by the high-temperature side temperature sensing to contract the starting advance spring (6), and this starting advance spring (6) is a pair of centrifugal weights. (3) Configured to release the expansion of (3) to the starting advance position,
In the advance device for cold start of the eccentric cam type mechanical timer of the engine,
The temperature-sensitive operating means (7) is constituted by a shape memory spring (8) made of a shape memory alloy material for a compression coil spring,
The shape memory spring (8) and the starting advance spring (6) are positioned between the pair of centrifugal weights (3) and (3), and with respect to the weight return spring (5). Arranged concentrically ,
Of the pair of centrifugal weights (3) and (3), one of the centrifugal weights (3) is provided with a weight return spring (5), whereas the other centrifugal weight (3) is provided with the inside. Comprises a starting advance spring (6) and a shape memory spring (8) .
The shape memory spring (8) and the starting advance spring (6) are arranged by being inserted and fitted to each other ,
A transmission cylinder (9) is inserted between the shape memory spring (8) and the start-advance spring (6) that are inserted and fitted to each other, and is removed from one end of the transmission cylinder (9). a collar (10) relative to cause Rendesa out side, so Rendesa the inner flange (11) on the inner side from the cylindrical other end,
The other centrifugal weight (3) of the pair of centrifugal weights (3) and (3) is made to receive the spring base end portion (12) of the starting advance spring (6), and this starting advance angle A spring tip (13) of the spring (6) is configured to press the one centrifugal weight (3) to the centrifugal side via the outer rod (10);
A weight opening / closing guide shaft (14) is inserted into the pair of centrifugal weights (3), (3), and one end side spring retainer (14a) is attached to one end of the weight opening / closing guide shaft (14) in one centrifugal weight (3). ), The weight return spring (5) in one centrifugal weight (3) is received by this one end side spring retainer (14a), and the weight opening / closing guide shaft (14) on the other centrifugal weight (3) side is received. A weight retaining retainer (14b) is provided at the end, and the weight retaining retainer (14b) is used to stop the other centrifugal weight (3) from coming out of the weight opening / closing guide shaft (14) in the centrifugal direction. An intermediate spring retainer (14c) is provided in the intermediate portion of the weight opening / closing guide shaft (14) in the transmission cylinder (9) of the centrifugal weight (3), and the shape memory spring (8) is provided by the intermediate spring retainer (14c). spring base end let receiving (15), let received on the inner flange of the spring tip of the shape memory spring (8) (16) the power transmission cylinder (9) (11), the shape memory spring (8) The spring tip (16) is configured to repress the starting advance spring (6) toward the compression side through the inner rod (11), the transmission cylinder (9), and the outer rod (10) in this order. ,
An angle advance device at the time of cold start of an eccentric cam type mechanical timer for an engine.

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