JP4825707B2 - engine - Google Patents

Description

  The present invention relates to an engine, and more particularly, to an engine capable of promptly canceling an advance angle after a cold start.

As in the case of the present invention, as in the present invention, the interlocked lower part near the crankshaft is interlocked with the interlocked lower part via a timer, and the timer is provided with a temperature-sensitive operating means, and the temperature-sensitive temperature of the temperature-sensitive operating means is When the engine is cold-started when the temperature is less than the predetermined value, the interlocking lower part is advanced by the advance of the timer based on the temperature-sensitive operation of the temperature-sensitive operation means, and the engine temperature at which the temperature-sensitive temperature of the temperature-sensitive operation means exceeds the predetermined value. In the warm state, there is a mechanism in which the advance angle of the interlocking lower part is released by the advance angle release operation of the timer based on the temperature sensing operation of the temperature sensing operation means (see, for example, Patent Document 1).
In this type of engine, the time of cold start is advancing the interlocking poor portion timer, to increase the startability, after cold start to release the advance of the interlocking poor portion timer, the reduction of the NO _X and noises There is an advantage that can be achieved.

  However, the conventional engine has a problem because the temperature-sensing operation means operates by sensing only the surrounding ambient temperature.

Japanese Patent Laying-Open No. 2005-273519 (see FIGS. 1 and 2)

The above prior art has the following problems.
<Problem> The advance angle release after a cold start is slow.
Since the temperature-sensitive operating means operates by sensing only the ambient temperature of the surroundings, even if the engine temperature rises after a cold start, it takes time for the temperature to be transmitted to the temperature-sensitive operating means. The advance angle release after the start is slow. For this reason, exhaust performance becomes low.

  It is an object of the present invention to provide an engine that can solve the above-described problems, that is, an engine that can promptly cancel the advance angle after a cold start.

(Invention-specific matters common to the inventions according to claims 1, 2, 11, 13, and 17)
Invention specific matters common to the inventions according to claims 1, 2, 11, 13, and 17 are as follows.
As shown in FIG. 1, FIG. 2 (A) to (C) or FIG. 8 (A) (B), the interlocking upper part (1) near the crankshaft (49) is interlocked via a timer (20). The lower part (2) is linked and connected, and the timer (20) is provided with a temperature sensing means (7). When the temperature sensing temperature of the temperature sensing action means (7) is less than a predetermined value, An engine in which the temperature of the temperature sensing means (7) is equal to or higher than a predetermined value by advancing the interlocking lower part (2) by the advance of the timer (20) based on the temperature sensing action of the temperature actuating means (7). In the engine, in which the advance angle of the interlocked lower part (2) is released by the advance angle release operation of the timer (20) based on the temperature sensing operation of the temperature sensing operation means (7),
The engine oil (56) pumped by the oil pump (57) is circulated in the engine, the oil injection port (58) is communicated with the oil pump (57), and the engine oil injected from the oil injection port (58) ( 56) is supplied to the timer (20), so that the engine oil (56) is brought into contact with the temperature sensitive operation means (7) .
(Invention-specific matters specific to the invention of claim 1)
As illustrated in FIG. 1 or FIG. 8A, the timer (20) is disposed in the gear case (76), the oil injection port (58) is opened in the gear case (76), and the oil injection port (58). The engine oil (56) injected from the engine is allowed to flow from the timer (20) into the gear case (76).
(Invention-specific matters specific to the invention of claim 2)
As illustrated in FIGS. 2 (A) to (C) or FIG. 8 (A), the temperature sensitive operation means (7) is constituted by a shape memory spring (8),
The timer (20) is composed of a cam interlocking part (3e) and an eccentric cam mechanism (4).
In the eccentric cam mechanism (4), disc cams (25) and (27) are attached to a cam holder (59), and the disc cams (25) and (27) are connected to the shape memory spring (8) via the cam interlocking portion (3e). ), And an advance angle operation and an advance angle release operation of the timer (20) are performed based on the expansion / contraction deformation operation of the shape memory spring (8).
(Invention-specific matters specific to the invention of claim 11)
As illustrated in FIGS. 2 (A) to 2 (C), the timer (20) is composed of a pair of centrifugal weights (3) and (3) and an eccentric cam mechanism (4), and each centrifugal weight (3) is a compression coil spring. An eccentric cam mechanism (4) is interlocked and connected to each centrifugal weight (3) by urging in an eccentric direction with a weight return spring (5) having a structure.
Each centrifugal weight (3) is operated by the unbalanced force between the centrifugal force of each centrifugal weight (3) and the biasing force of the weight return spring (5), and each centrifugal weight (3) is operated in the centrifugal direction. Through the eccentric cam mechanism (4), the interlocking lower hand part (2) is advanced with respect to the interlocking upper hand part (1), and the eccentric cam mechanism (4 ) To retard the interlocking lower part (2) relative to the interlocking upper part (1),
As illustrated in FIGS. 3A and 3E, each centrifugal weight (3) is interlocked with a starting advance spring (6) of a compression coil spring structure, and the starting advance spring (6) is operated in a temperature sensitive manner. When the engine is cold-started, the start-advance spring (6) is maintained in an extendable state based on the temperature-sensitive operation state of the temperature-sensitive operation means (7). The spring force of the advance spring (6) pushes the pair of centrifugal weights (3) (3) to the cold start advance position (Ac), and when the engine is warm, the temperature sensing means (7) feels Based on the temperature operating state, the starting advance spring (6) is maintained in a contracted state so that the spring force of the starting advance spring (6) does not act on the pair of centrifugal weights (3) (3). ,
As illustrated in FIGS. 4A and 4B, a shape memory spring (8) having a compression coil spring structure is used for the temperature sensitive operation means (7), and the shape memory spring (8) and a starting advance spring ( 6) in a concentric posture with the weight return spring (5) and intervene between the pair of centrifugal weights (3) and (3),
Of the pair of centrifugal weights (3) and (3), a weight return spring (5) is accommodated in a spring accommodation hole (3a) formed in one centrifugal weight (3), and the other centrifugal weight (3) is contained. A starting advance spring (6) and a shape memory spring (8) are accommodated in the spring accommodating hole (3a) formed in
An engine characterized in that the shape memory spring (8) and the starting advance spring (6) have an internal / external double structure.
(Invention-specific matters specific to the invention of claim 13)
As illustrated in FIGS. 5 (A) and 5 (B), the first advance limit restricting body (41) and the second advancement are connected to the shape memory spring (8) via the output means (39) and the restriction switching means (44). The advance angle limiter (42) is linked to be switchable,
At the time of cold start of the engine, the first advance limiter (41) can be limited via the output means (39) and the limit switching means (44) based on the temperature sensing operation state of the shape memory spring (8). The upper limit of the operation in the centrifugal direction of each centrifugal weight (3) is limited to the first advance limit position (L1) by the first advance limiter (41),
When the engine is warm, the second advance limiter (42) can be limited via the output means (39) and the limit switching means (44) based on the temperature sensing operation state of the shape memory spring (8). By means of this second advance angle restricting body (42), the upper limit of the operation of each centrifugal weight (3) in the centrifugal direction is restricted to the second advance angle restricting position (L2),
The second advance angle limit position (L2) lowers the upper limit of the operation in the centrifugal direction of each centrifugal weight (3) and lowers the upper limit of the advance angle (Θ) than the first advance angle limit position (L1). An engine characterized by that.
(Invention-specific matters specific to the invention of claim 17)
As illustrated in FIGS. 8 (A), 9 (A), 10, 11 (A) and (B), the timer (20) is constituted by an eccentric cam mechanism (4), and the cam holder (59) and the cam The drive plate (60) is placed on top of each other, the disc cams (25), (25), (27), and (27) are attached to the cam holder (59), and the input pins ( 65) and 65) are attached, guide holes (67) and (67) are provided in the cam drive plate (60), and input pins (65) and (65) are fitted into the guide holes (67) and (67) to A pair of support portions (60b) and (59b) project from the end surface (60a) of the drive plate (60) and the end surface (59a) of the cam holder (59) exposed at the side of the cam drive plate (60). The temperature sensitive operating means (7) is disposed in an exposed state between the support portions (60b) and (59b), and the cam drive plate (60) is rotated based on the deformation of the temperature sensitive operating means (7) to guide the guide. Hole (67) (67) and input pin (65) (65) Engine drives the disk cam (25) (27) and, and to perform the advance operation and the advance release operation of the timer (20), characterized in that.

(Invention according to Claim 1)
<< Effect 1-1 >> It is possible to promptly cancel the advance angle after the cold start.
As shown in FIG. 1, FIG. 2 (A) to (C) or FIG. 8 (A) (B), the engine oil (56) is brought into contact with the temperature sensitive operating means (7). After the cold start, the engine oil (56) that quickly rises in temperature comes into contact with the temperature sensing means (7), and the increase in the engine temperature is quickly transmitted to the temperature sensing means (7), so that the advance angle after the cold start is reached. Release can be made promptly. For this reason, exhaust gas performance increases.

<< Effect 1-2 >> The advance angle release operation after the cold start can be promptly performed.
As illustrated in FIG. 1 or FIG. 8A, the timer (20) is disposed in the gear case (76), the oil injection port (58) is opened in the gear case (76), and the oil injection port (58). Since the engine oil (56) injected from the engine flows out of the timer (20) into the gear case (76), the engine oil (58) that quickly rises in temperature after the cold start jumps with the gear in the gear case (76). As a result, the gear case (76) is filled with oil mist, and the ambient temperature around the temperature sensing means (7) is quickly increased. For this reason, the advance angle release operation after the cold start can be performed promptly.
(Invention of Claim 2)
In addition to the effect 1-1 of the invention according to claim 1, the following effect is achieved.
<Effect 2> The timer can be configured compactly.
2 (A) to (C) or FIG. 8 (A), the temperature sensitive operation means (7) is composed of a shape memory spring (8), and the timer (20) is connected to the cam interlocking portion (3e). ) And the eccentric cam mechanism (4), the timer (2) can be made compact.
(Invention of Claim 3)
In addition to the effect of the invention according to claim 2, the effect 1-2 of the invention according to claim 1 is achieved.

(Invention of Claim 4 )
In addition to the effect of the invention according to claim 1 or claim 3 , the following effect is achieved.
< Effect 4 > The timer can be arranged in a compact manner.
As illustrated in FIG. 1 or FIG. 8A, with the axial length direction of the sleeve (2c) as the front-rear direction, the timer (20) and the interlocking upper gear (1b) are arranged in the front-rear direction and fitted over the sleeve (2c). As a result, the timer (20) can be arranged compactly.

(Invention according to claim 5 )
In addition to the effect of the invention according to claim 4 , the following effect is achieved.
<< Effect 5 >> The timer can be arranged compactly.
As illustrated in FIG. 1 or FIG. 8A, a concave portion (1c) is provided on one of the front and rear surfaces of the interlocking upper gear (1b), and at least a part of the timer (20) is accommodated in the concave portion (1c). Therefore, the timer (20) can be arranged in a compact manner.

(Invention of Claim 6)
In addition to the effect of the invention according to claim 4 or claim 5 , the following effect is achieved.
<Effect> The accuracy of the timer can be maintained high.
As illustrated in FIGS. 2A to 2C, the engine oil (56) injected into the sleeve (2c) from the oil injection port (58) flows out of the oil outlet (2d) and flows into the timer (20 The engine oil (56) injected into the sleeve (2c) from the oil injection port (58) collides with the timer (20). Therefore, the accuracy of the timer can be kept high.

(Invention of Claim 7)
In addition to the effect of the invention according to claim 6, the following effect is achieved.
<Effect> The accuracy of the timer can be maintained high.
As illustrated in FIG. 2A, the engine oil (56) flowing out from the oil outlet (2d) and supplied to the timer (20) is between the centrifugal weight (3) and the guide plate (88). Since the sliding resistance of the centrifugal weight (3) with respect to the guide plate (88) is reduced, the accuracy of the timer (20) can be maintained high.

(Invention of Claim 8)
In addition to the effects of the invention according to any one of claims 1 to 3 , the following effects can be obtained.
<Effect> The oil injection port can be easily arranged.
As illustrated in FIG. 1, since the oil injection port (58) is arranged on the wall of the gear case (76), the oil injection port (58) can be easily arranged avoiding interference with the gear in the gear case (76). can do.

(Invention according to claim 9)
In addition to the effect of the invention according to the eighth aspect, the following effect can be obtained.
<Effect> Oil piping can be easily arranged.
As illustrated in FIG. 1, an external pipe (58a) is provided outside the engine machine wall, and the oil gallery (58c) in the cylinder block (58b) and the oil injection port of the gear case (76) are provided by this external pipe (58a). Since (58) is in communication with each other, it is possible to easily arrange the oil piping while avoiding interference with the gear in the gear case (76).

(Invention of Claim 10)
In addition to the effects of the invention according to any one of claims 4 to 7 , the following effects are provided.
<Effect> The sleeve can be fixed compactly.
As illustrated in FIG. 2A, when fixing the sleeve (2c) to the interlocking lower rotation shaft (2b) with the fastener (2e), the fastener (2e) is accommodated in the sleeve (2c). The sleeve (2c) can be fixed in a compact manner.

(Inventions according to claims 11 and 12 )
In addition to the effect 1-1 of the invention according to claim 1, the following effect is achieved.
<Effect> The transmission resistance from the starting advance spring to the pair of centrifugal weights can be reduced.
As illustrated in FIG. 3 (A), the starting advance spring (6) is positioned concentrically with the weight return spring (5) and is interposed between the pair of centrifugal weights (3) and (3). The pair of centrifugal weights can be directly cooled by the spring force of the starting advance spring (6) without using a spring force transmission means such as a taper cam for changing the direction of the spring force of the starting advance spring (6). Therefore, the transmission resistance from the starting advance spring (6) to the pair of centrifugal weights (3) and (3) can be reduced. For this reason, the accuracy of the advance angle at the cold start of the engine is high, the start advance spring (6) and the temperature sensitive operation means (7) are sufficient for a small and low output, and durability due to wear of the transmission part is sufficient. There is an advantage that the decrease can be suppressed.

<Effect> The timer can be downsized.
As illustrated in FIG. 3 (A), a shape memory spring (8) having a compression coil spring structure is used for the temperature sensitive operating means (7), and the shape memory spring (8) and the starting advance spring (6) are combined. Since the posture is concentric with the weight return spring (5) and interposed between the pair of centrifugal weights (3) and (3), the timer (20) becomes small as illustrated in FIG. For this reason, the starter advance spring (6) and the temperature sensitive actuating means (7) need only be small and low output, so that the timer can be miniaturized.

(Invention according to claims 13 to 16 )
In addition to the effect 1-1 of the invention according to claim 1, the following effect is achieved.
<Effect> It is possible to smoothly start the engine cold and to improve the exhaust gas performance when the engine is warm.
As illustrated in FIG. 5A, when the engine is cold started, the upper limit of the centrifugal operation of each centrifugal weight (3) is limited to the first advance limit position (L1), Sometimes, the upper limit of the centrifugal operation of each centrifugal weight (3) is limited to the second advance limit position (L2), and the second advance angle limit position (L2) is more than the first advance angle limit position (L1). Since the upper limit of the operation in the centrifugal direction of each centrifugal weight (3) is lowered so that the upper limit of the advance angle (Θ) is lowered, the following advantages are obtained. In other words, by setting the upper limit of the advance angle (Θ) high for cold start of the engine, the engine can be started smoothly, and when the engine is warm, the upper limit of the advance angle (Θ) is set low. The exhaust gas performance can be improved.

(Invention of Claim 17 )
In addition to the effect 1-1 of the invention according to claim 1, the following effect is achieved.
<Effect> The advance angle can be released more quickly after the cold start.
As shown in FIG. 8 (A), since the temperature sensitive operation means (7) is disposed in an exposed state between the pair of support portions (60b) (59b), the engine oil (from the oil injection port (58)) ( 56) can easily come into contact with the temperature-sensitive operating means (7), the sensitivity of the temperature-sensitive operating means (7) is increased, and the advance angle release after the cold start can be performed more quickly.

(Invention of Claim 18 )
In addition to the effect of the invention according to claim 17 , the following effect is achieved.
<Effect> The cost for forming the engine oil supply means is reduced.
As illustrated in FIG. 8A, engine oil (56) is provided between the idle gear (69) and the pivot (70) in the oil supply passage (71) provided in the pivot (70) of the idle gear (69). ), The extension passage (72) is led out from the oil supply passage (71), and the lead-out end of the extension passage (72) is used as the oil injection port (58), so that the existing idle gear (69) The engine oil (56) can be supplied using the oil supply passage (71), and the cost for forming the supply means for the engine oil (56) is reduced.

(Invention of Claim 19 )
In addition to the effect of the invention according to claim 18 , the following effect is achieved.
<Effect> The cost for forming the engine oil supply means is reduced.
As illustrated in FIG. 8 (B), a groove-shaped extension passage (72) along the distal end surface (70a) of the pivot (70) is formed on the back surface of the retaining plate (74), and the retaining plate (74). Since the oil injection port (58) is opened at the periphery of the engine oil, the engine oil (56) can be supplied using the existing retaining plate (74), thereby forming a supply means for the engine oil (56). Cost is reduced.
(Invention of Claim 20)
In addition to the effect of the invention according to any one of claims 17 to 19, the effect 1-2 of the invention according to claim 1 is achieved.
(Invention of Claim 21)
In addition to the effect of the invention according to claim 20, the effect 4 of the invention according to claim 4 is achieved.
(Invention of Claim 22)
In addition to the effect of the invention according to claim 21, the effect 5 of the invention according to claim 5 is achieved.
(Invention of Claim 23)
In addition to the effect of the invention according to any one of claims 17 to 22, the effect 2 of the invention according to claim 2 is achieved.

  Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 7 are diagrams illustrating an engine according to a first embodiment of the present invention. FIGS. 8 to 11 are diagrams illustrating an engine according to a second embodiment of the present invention. This is a multi-cylinder diesel engine.

The outline of the first embodiment of the present invention is as follows.
As shown in FIG. 7, the crankshaft (49) is installed in the crankcase of the cylinder block (58b), the installation direction of the crankshaft (49) is the front-rear direction, and one of them is the front, and the cylinder block (58b) A gear case (76) is attached to the front portion, the lateral side portion of the gear case (76) is projected laterally from the lateral side wall of the cylinder block (58b), and a pump housing case ( 78) is attached. As shown in FIG. 1, a fuel injection pump (79) is inserted into the pump storage case (78) from above, and substantially the entire fuel injection pump (79) is stored in the pump storage case (78). Yes. A fuel injection cam shaft (23) is accommodated in the lower portion of the pump housing case (78), and the fuel injection pump (79) is interlocked with the fuel injection cam shaft (23). A timer (20) is disposed at the front end of the fuel injection cam shaft (23). As shown in FIG. 7, the idle gear (69) is engaged with the crankshaft (49), and the fuel injection cam gear (21) is engaged with the idle gear (69).

The outline of the timer is as follows.
As shown in FIGS. 2A to 2C, the interlocking lower part (2) is connected to the interlocking upper part (1) near the crankshaft (49) via the timer (20). ) Is provided with a temperature sensing means (7), and at the time of cold start when the temperature sensing temperature of the temperature sensing action means (7) is less than a predetermined value, a timer (based on the temperature sensing action of the temperature sensing action means (7) ( When the engine is warm when the temperature sensing temperature of the temperature sensing means (7) exceeds a predetermined value, the sense of the temperature sensing means (7) is sensed. The advance angle release operation of the timer (20) based on the temperature operation releases the advance angle of the interlocked lower part (2).

The device of the timer is as follows.
As shown in FIG. 1, engine oil (56) pumped by an oil pump (57) is circulated in the engine, and an oil injection port (58) is communicated with the oil pump (57). ) Is supplied to the timer (20), so that the engine oil (56) is brought into contact with the temperature sensitive operating means (7). The oil pump (57) sucks the engine oil (56) in the oil pan (56a) and pumps it to the oil gallery (58c) in the cylinder block (58b).

  As shown in FIG. 1, a timer (20) is disposed in a gear case (76), an oil injection port (58) is opened in the gear case (76), and engine oil (56 is injected from the oil injection port (58). ) Flows out of the timer (20) into the gear case (76).

As shown in FIG. 1, the interlocking upper part (1) is constituted by an interlocking upper gear (1b), and the rotating lower part (2) is constituted by a sleeve (2c) fixed to the rotating interlocking lower hand shaft (2b). The timer (20) and the interlocking upper gear (1b) are lined up in the front-rear direction and the sleeve (2c) is externally fitted with the axial direction of the sleeve (2c) as the front-rear direction. This interlocking upper gear (1b) is a fuel injection cam gear (21).
As shown in FIG. 1, a recess (1c) is provided on one of the front and rear surfaces of the interlocking upper gear (1b), and at least a part of the timer (20) is accommodated in the recess (1c). Specifically, the recess (1c) is formed on the front surface of the interlocking upper gear (1b), and the eccentric cam mechanism (4) at the rear of the timer (20) is accommodated in the recess (1c).

As shown in FIGS. 2 (A) to 2 (C), the temperature sensing operation means (7) is constituted by a shape memory spring (8), the timer (20) is composed of a cam interlocking portion (3e) and an eccentric cam mechanism (4). The eccentric cam mechanism (4) is configured by attaching the disc cams (25) and (27) to the cam holder (59), and forming the disc cams (25) and (27) via the cam interlocking portion (3e). The memory spring (8) is interlocked and connected, and the advance angle operation and the advance angle release operation of the timer (20) are performed based on the expansion / contraction deformation operation of the shape memory spring (8).
As shown in FIGS. 2 (A) to (C), the oil injection port (58) faces the sleeve (2c), the oil outlet (2d) is provided on the peripheral wall of the sleeve (2c), and the oil injection port ( 58), engine oil (56) injected into the sleeve (2c) flows out from the oil outlet (2d) and is supplied to the timer (20) so as to come into contact with the temperature sensing means (7). .

As shown in FIGS. 2A to 2C, the timer (20) is composed of a cam interlocking portion (3e) and an eccentric cam mechanism (4), and the cam interlocking portion (3e) is a pair of centrifugal weights (3). (3), and the pair of centrifugal weights (3) and (3) are placed along the guide plates (88) and (88), and the eccentric cam mechanism (4) is attached to the cam holder (59) and the disc cam (25) ( 27) is attached, and this disc cam (25) (27) is linked to the temperature sensing means (7) via the cam interlocking part (3e), and the temperature sensing of the temperature sensing means (7). Based on the operation, the advance angle operation and the advance angle release operation of the timer (20) are performed as follows.
Engine oil (56) flowing out from the oil outlet (2d) and supplied to the timer (20) is also supplied between the centrifugal weight (3) and the guide plate (88).
As shown in FIG. 1, the oil injection port (8) is arranged on the wall of the gear case (76).

As shown in FIG. 1, an external pipe (58a) is provided outside the engine machine wall, and an oil gallery (58c) in a cylinder block (58b) and an oil injection port (58) in a gear case (76) are provided by this external pipe (58a). 58).
As shown in FIG. 2A, the fastener (2e) is accommodated in the sleeve (2c) when the sleeve (2c) is fixed to the interlocking lower rotation shaft (2b) with the fastener (2e).

The structure of the eccentric cam mechanism is as follows.
As shown in FIG. 2 (B), a pair of large-diameter cam holes (24) and (24) are formed in the cam holder (59), and a large-diameter disk cam (25) is fitted in each large-diameter cam hole (24). A small-diameter cam hole (25a) and a pin hole (25b) are made in each large-diameter disk cam (25), and a small-diameter disk cam (27) is fitted in each small-diameter cam hole (25a). An output pin (3d) from each centrifugal weight (3) is fitted into (25b), a pin hole (27a) is made in each small-diameter disk cam (27), and a pin (29) is inserted into this pin hole (27a). As shown in FIG. 2 (A), this pin (29) is fitted into the pin hole (1d) of the interlocking upper portion (1).

Adjustment of the advance angle by the operation of the eccentric cam mechanism is as follows.
Each centrifugal weight (3) is operated by the unbalanced force between the centrifugal force of each centrifugal weight (3) and the biasing force of the weight return spring (5), and each centrifugal weight (3) is operated in the centrifugal direction. Through the eccentric cam mechanism (4), the interlocking lower hand part (2) is advanced with respect to the interlocking upper hand part (1), and the eccentric cam mechanism (4 ) To retard the interlocking lower part (2) with respect to the interlocking upper part (1). Specifically, as shown in FIG. 2 (B), if the output pin (3d) from each centrifugal weight (3) moves in the centrifugal direction due to the operation of each centrifugal weight (3) in the centrifugal direction, The diameter disk (25) rotates in the direction of the arrow (25c), and the small diameter disk (27) rotates in the direction of the arrow (27b), and the distance between the output pin (3d) and the pin (29) becomes wide. The output pin (3d) is shifted to the lower side of the rotation direction (1a) of the interlocking upper part (1), and the interlocking lower part (2) is moved to the lower side of the rotation direction (1a) with respect to the interlocking upper part (1). Due to the deviation, the interlocking lower part (2) advances with respect to the interlocking upper part (1). When the output pin (3d) from each centrifugal weight (3) moves in the centripetal direction by the operation of each centrifugal weight (3) in the centripetal direction, the large-diameter disk (25) and the small-diameter disk (27). The rotation direction of each is opposite to the above, the output pin (3d) of the centrifugal weight (3) is shifted to the upper side of the rotation direction (1a) of the interlocking upper part (1), and the interlocking lower hand part (2) is interlocking Since the upper part (1) is shifted toward the upper side in the rotation direction (1a), the interlocking lower part (2) is retarded with respect to the interlocking upper part (1). For this reason, when the engine rotation speed increases and the centrifugal force of each centrifugal weight (3) increases, the fuel injection cam shaft (23) advances and the fuel injection timing is advanced. On the other hand, when the engine speed decreases and the centrifugal force of each centrifugal weight (3) decreases, the fuel injection camshaft (23) is retarded and the fuel injection timing is delayed.

The structure for obtaining the starting advance angle is as follows.
As shown in FIG. 3 (A), each centrifugal weight (3) is interlocked with a starting advance spring (6) of a compression coil spring structure, and this starting advance spring (6) is connected to a temperature sensitive operating means (7). As shown in FIG. 4 (A), when the engine is cold started, the start-advance spring (6) is moved based on the temperature-sensitive operating state (contracted state) of the temperature-sensitive operating means (7). Maintaining the stretchable state, the spring force of the starting advance spring (6) pushes the pair of centrifugal weights (3) and (3) to the cold starting advance position (Ac), and FIG. When the engine is warm, the starting advance spring (6) is maintained in the contracted state based on the temperature sensing operation state (extension state) of the temperature sensing means (7). The spring force of the service spring (6) is prevented from acting on the pair of centrifugal weights (3) and (3). When the engine is warm, it means when the engine is operating or when the engine is warmly started.

The structure of the temperature sensitive operation means is as follows.
As shown in FIG. 3 (A), a shape memory spring (8) having a compression coil spring structure is used as the temperature sensing means (7), and the shape memory spring (8) and the starting advance spring (6) are connected to a weight. A posture concentric with the return spring (5) is interposed between the pair of centrifugal weights (3) and (3). The shape memory spring (8) is made of a shape memory alloy and has a property of contracting when the engine is cold started and extending when the engine is warm.

The outline of the arrangement of the shape memory spring and the like is as follows.
As shown in FIG. 3A, the weight return spring (5) is accommodated in the spring accommodating hole (3a) formed in one centrifugal weight (3) of the pair of centrifugal weights (3) and (3). The starting advance spring (6) and the shape memory spring (8) are housed in the spring housing hole (3a) formed in the other centrifugal weight (3). The shape memory spring (8) and the starting advance spring (6) have an internal / external double structure.

Details of the arrangement of the shape memory spring and the like are as follows.
As shown in FIGS. 4A and 4B, a first spring seat (3b) is provided at the inner bottom of the spring accommodating hole (3a) of the centrifugal weight (3) accommodating the starting advance spring (6). The base end portion (12) of the starting advance spring (6) is seated on the first spring seat (3b), and the transmission cylinder (9) is concentric in the starting advance spring (6). The first spring retainer (10) is provided outwardly at the distal end of the transmission cylinder (9) near the distal end (13) of the starting advance spring (6). The first spring retainer (10) is brought into contact with the retainer receiving surface (3c) of the centrifugal weight (3) containing the weight return spring (5). I am letting.

  A shaft (14) is attached to the centrifugal weight (3) containing the starting advance spring (6), and this shaft (14) is concentrically disposed in the transmission cylinder (9). A second spring seat (14a) is provided, and the base end portion (15) of the shape memory spring (8) is seated on the second spring seat (14a), and the shape memory spring (8) is transmitted to the shaft (14). The second spring retainer (11) is placed inwardly at the distal end of the transmission cylinder (9), which is concentrically disposed between the cylinder (9) and the distal end (16) of the shape memory spring (8). The second spring retainer (11) is configured to receive the tip portion (16) of the shape memory spring (8). The shaft (14) is an open / close guide shaft for the pair of centrifugal weights (3) and (3). The shaft (14) is inserted into a spring housing hole (3a) housing the weight return spring (5). A third spring seat (3d) is provided on the inner bottom of the accommodation hole (3a), and the base end portion (5a) of the weight return spring (5) is seated on the third spring seat (3d). 5) is arranged concentrically outside the shaft (14), a third spring retainer (14b) is provided at the tip of the shaft (14), and the tip of the weight return spring (5) is provided by the third spring retainer (14b). (5b) is being received. A washer (14c) is provided at the base end portion of the shaft (14), and the washer (14c) is brought into contact with the centrifugal weight (3) on the start advance spring (6) side to return a weight return spring (5). The spring (14) prevents the shaft (14) from coming off.

As shown in FIG. 4 (A), when the engine is cold started, the starting advance spring (6) is maintained in an expandable state based on the temperature sensitive operation state of the contracted shape memory spring (8). The spring force of the starting advance spring (6) is applied to the first spring seat (3b) and the retainer receiving surface (3c), so that the pair of centrifugal weights (3) (3) are cold started. It is designed to be pushed to the corner position (Ac).
As shown in FIG. 4B, when the engine is warm, the starting advance spring (6) is maintained in a contracted state based on the temperature sensing operation state of the extended shape memory spring (8). The spring force of the advance spring (6) is prevented from acting on the first spring seat (3b) and the retainer receiving surface (3c).

The outline of the advance angle upper limit switching structure is as follows.
As shown in FIG. 3 (E), the first advance limit restricting body (41) and the second advance angle restricting body are connected to the shape memory spring (8) via the output means (39) and the limit switching means (44). (42) is linked to be switchable.
As shown in FIG. 5 (A), when the engine is cold started, the output means (39) and the limit switching means (44) are connected based on the temperature sensitive operation state (contracted state) of the shape memory spring (8). The first advance angle restricting body (41) can be restricted via the first advance angle restricting body (41), and the upper limit of the operation of each centrifugal weight (3) in the centrifugal direction is set to the first advance angle restricting position. Limited to (L1).
As shown in FIG. 5B, when the engine is warm, based on the temperature sensing operation state (extension state) of the shape memory spring (8), the output means (39) and the limit switching means (44) are used. The second advance angle restricting body (42) is in a restrictable state, and the second advance angle restricting body (42) sets the upper limit of the operation of each centrifugal weight (3) in the centrifugal direction to the second advance angle restricting position ( Limited to L2).
The second advance angle limit position (L2) lowers the upper limit of the operation in the centrifugal direction of each centrifugal weight (3) and lowers the upper limit of the advance angle (Θ) than the first advance angle limit position (L1). I am doing so.
This second advance limit position (L2) is the cold start advance position (Ac) of the engine.

The details of the advance angle upper limit switching structure are as follows.
As shown in FIG. 3 (E), a rotary plate (44a) is used as the selection switching means (44), and this rotary plate (44a) is provided on one side of a pair of centrifugal weights (3) and (3). The rotating plate (44a) is rotatable around the rotation center line (18) of the interlocking lower hand portion (2).
A first advance angle restricting hole (46) and a second advance angle restricting hole (47) are formed in the rotating plate (44a), and the first advance angle restricting hole (46) and the second advance angle restricting hole (47) are formed. Are arranged in the rotational direction of the centrifugal weight (3) and communicated with each other to form a communication hole (45).
The first advance angle restricting body (41) is formed at the distal peripheral portion of the first advance angle limiting hole (46), and the second advancement is performed at the distal peripheral portion of the second advance angle limiting hole (47). An angle limiting body (42) is formed, and an engaging projection (48) is projected from each centrifugal weight (3) into the communication hole (45).
As shown in FIG. 5 (A), when the engine is cold-started, the rotary plate (44a) is set to the first rotation posture based on the temperature-sensitive operation state (contraction state) of the shape memory spring (8), The first advance limiter (41) can receive the engagement protrusion (48).
As shown in FIG. 5 (B), when the engine is warm, the rotary plate (44a) is set in the second rotation posture based on the temperature sensing operation state (extension state) of the shape memory spring (8). The engagement protrusion (48) can be received by the binary angle limiting body (42).

Other ideas are as follows.
As shown in FIG. 2 (A), the rotating plate (44a) is provided on one side of a pair of centrifugal weights (3) and (3), whereas the eccentric cam mechanism (4) is provided with the pair of centrifugal weights. (3) It is arranged on the other side of (3), and a pin (28) is passed through each centrifugal weight (3). One end of the pin (28) is used as the engagement protrusion (48). The other end of the pin (28) is an output pin (3d) from each centrifugal weight (3) to the eccentric cam mechanism (4). As shown in FIG. 3 (F), an output pin (39a) is used as an output means (39) from the shape memory spring (8), and an engagement hole (38) is formed in the rotating plate (44a). The output pin (39a) is engaged with the engagement hole (38). The output pin (39a) is attached to the first spring retainer (10).

The configuration of the second embodiment of the present invention is as follows.
As shown in FIG. 8 (A), a gear case (76) is disposed at the rear of the cylinder block (58b), with the crankshaft erection direction being the front-rear direction, one of which is the front and the other the rear, and this gear case (76) A gear train (77) is housed inside. The lateral end of the gear case (76) is projected laterally from the lateral wall of the cylinder block (58b), and a pump housing case (78) is attached to the front of the lateral projection (76a) of the gear case (76). A fuel injection pump (79) is housed in the housing case (78). A fuel injection cam shaft (23) is installed in the pump housing case (78) below the fuel injection pump (79). This engine includes a timer (20).

The outline of the timer is as follows.
As shown in FIG. 8 (A), the interlocking lower part (2) is connected to the interlocking upper part (1) near the crankshaft via the timer (20), and the timer (20) is connected to the temperature sensitive operation means ( 7) and a timer (20 based on the temperature sensing operation of the temperature sensing operation means (7) at the cold start when the temperature sensing temperature of the temperature sensing operation means (7) is less than a predetermined value (for example, less than 0 ° C.). When the engine temperature is higher than a predetermined value (for example, 0 ° C. or higher), the temperature-sensitive operating means ( The advance angle release operation of the timer (20) based on the temperature sensing operation of 7) releases the advance angle of the interlocking lower part (2). Also in the second embodiment, the interlocking upper part (1) is the fuel injection cam gear (21), and the interlocking lower part (2) is the sleeve (2c).

The device of the timer is as follows.
As shown in FIG. 8A, the engine oil (56) pumped by the oil pump (57) is circulated in the engine, and the oil injection port (58) is communicated with the oil pump (57). Engine oil (56) is supplied from the mouth (58) to the timer (20), and the engine oil (56) is brought into contact with the temperature sensitive operating means (7).

As shown in FIG. 8A, the timer (20) is arranged in the gear case (76), the oil injection port (58) is opened in the gear case (76), and the timer (20 ) Is supplied to the gear case (76). The oil injection port (58) is an oil injection port, and the engine oil (56) is injected from the oil injection port (58) to the timer (20).
As shown in FIG. 8A, the interlocking upper part (1) is composed of an interlocking upper gear (1b), and the rotating lower part (2) is composed of a sleeve (2c) fixed to the rotating interlocking lower shaft (2b). Then, the axial length direction of the sleeve (2c) is the front-rear direction, and the timer (20) and the interlocking upper gear (1b) are arranged in the front-rear direction and are externally fitted to the sleeve (2c).
As shown in FIG. 8A, a recess (1c) is provided on one of the front and rear surfaces of the interlocking upper gear (1b), and at least a part of the timer (20) is accommodated in the recess (1c). Specifically, the recess (1c) is formed on the rear surface of the interlocking upper gear (1b), and the eccentric cam mechanism (4) at the front of the timer (20) is accommodated in the recess (1c).

The specific structure of the timer is as follows.
As shown in FIG. 8 (A), the timer (20) is composed of an eccentric cam mechanism (4), and the fuel injection cam gear (21) is connected to the rear end portion (23a) of the fuel injection cam shaft (23) in order from the front. The cam holder (59) and the cam drive plate (60) are mounted in an overlapping manner, and as shown in FIGS. 9A and 9B, the rear end surface (60a) of the cam drive plate (60) and the cam drive plate (60) A pair of support portions (60b) and (59b) project from the rear end surface (59a) of the cam holder (59) exposed by the side, and the temperature sensitive operation means (7) is provided between the pair of support portions (60b) and (59b). ) Is exposed. The temperature sensitive actuating means (7) is a shape memory alloy push spring, that is, a shape memory spring (8). As shown in FIGS. 9 (A) and 9 (B), a telescopic rod (87) installed between a pair of support portions (60b) and (59b) is inserted into the temperature-sensing operation means (5), and temperature sensing The operating means (7) is prevented from falling off. As shown in FIGS. 9A and 9C, there is a pair of rear end surface (60a) of the cam drive plate (60) and rear end surface (59a) of the cam holder (59) exposed beside the cam drive plate (60). The other support portions (60c) and (59c) are provided in a projecting manner, and a tension spring type return spring (85) is installed between the pair of support portions (60c) and (59c). As shown in FIG. 8A, a sleeve (2c) is non-rotatably attached to the rear end portion (23a) of the fuel injection camshaft (23), and a fuel injection cam gear (21) is attached to the sleeve (2c). A cam drive plate (60) is rotatably attached, and a cam holder (59) is attached to the sleeve (2c) in a non-rotatable manner.

  As shown in FIG. 10, the cam holder (59) is provided with a pair of circular large-diameter cam holes (24) and (24), and the large-diameter cam holes (24) and (24) have large-diameter disk cams (25) ( 25) is rotatably fitted. Small diameter cam holes (25a) (25a) are opened in the large diameter disk cams (25) (25), and the small diameter disk cams (27) (27) are rotatable in the small diameter cam holes (25a) (25a). It fits inside. Input pins (65) and (65) are attached to the large-diameter disk cams (25) and (25), and guide holes (67) and (67) are provided in the cam drive plate (60). The guide holes (67) and (67) The input pins 65 and 65 are fitted inside. Output pins (29) and (29) are attached to the small-diameter disk cams (27) and (27), and these pins (29) and (29) are fitted into the pin holes (1d) of the fuel injection cam gear (23). The guide holes (67) and (67) are inclined with respect to the rotational direction of the cam drive plate (60).

The advance angle operation and advance angle release operation of the timer are as follows.
As shown in FIG. 11A, at the time of cold start, since the temperature sensing temperature of the temperature sensing operating means (7) is less than a predetermined value, the temperature sensing operating means (7) is contracted and the cam drive plate ( 60) maintains the advance operation posture by the spring force (85a) of the return spring (85), and the input pins (65) and (65) are located at the outer ends of the guide holes (67) and (67). (20) is an advance operation state. After the cold start, the engine oil (56) that quickly rises in temperature is injected into the timer (20), and the increase in the engine temperature is quickly transmitted to the temperature-sensing operation means (7). As shown in FIG. 11 (B), the temperature sensing means (7) expands and the cam drive plate (60) resists the spring force (85a) of the return spring (85). Thus, the advance angle release posture is established, the input pins (65) and (65) are positioned at the inward ends of the guide holes (67) and (67), and the timer (20) is in the advance angle release operation state.

The operation of the eccentric rotating cam mechanism is as follows.
As shown in FIG. 11 (A), when the temperature sensing temperature of the temperature sensing operating means (20) becomes less than a predetermined value, the input pins (65) (65) are rotated by the rotation of the cam drive plate (60). Is pushed outward. In this case, as shown in FIG. 10, when the cam holder (59) is viewed from the rear, the large-diameter disk cams (25) and (25) rotate clockwise and the small-diameter disk cams (27) and (27) are counterclockwise. By rotating clockwise, the phase of the input pins (65) and (65) is biased toward the lower side of the rotation direction (86) of the fuel injection cam shaft (23), and the fuel injection cam shaft (23) is advanced. As shown in FIG. 11 (B), when the temperature sensing temperature of the temperature sensing means (7) exceeds a predetermined value, the input pins (65) (65) are rotated by the rotation of the cam drive plate (60). Is pushed inward. In this case, conversely to FIG. 10, the large-diameter disk cams (25) and (25) rotate counterclockwise, and the small-diameter disk cams (27) and (27) rotate clockwise and the input pin (65) The phase of (65) is biased toward the upper side of the rotation direction (86) of the fuel injection cam shaft (23), and the advance angle of the fuel injection cam shaft (23) is released.

Other ideas are as follows.
As shown in FIG. 8 (A), the fuel injection cam gear (21) and the idle gear (69) are engaged with each other, and the oil supply passage (71) provided in the pivot (70) of the idle gear (69) is idled. The engine oil (56) is supplied between the gear (69) and the pivot (70), the extension passage (72) is led out from the oil supply passage (71), and the lead-out end of the extension passage (72) is connected to the oil. The injection port (58) is used.

  As shown in FIG. 8A, an idle gear 69 is fitted to the pivot 70, and a retaining plate 74 is attached to the tip surface 70a of the pivot 70. The retaining plate 74 The idle gear (69) is prevented from slipping off, and a groove-like extension passage (72) along the tip surface (70a) of the pivot (70) is formed on the back surface of the retaining plate (74). The oil injection port (58) is opened at the peripheral edge of. The retaining plate (74) is attached to the pivot (70) with a mounting bolt (88). The groove-like extension passage (72) is formed transversely in the radial direction of the retaining plate (74) for ease of processing, so that oil injection ports (58) are formed at both ends. From the viewpoint of injecting the engine oil (6) into the timer (20), the oil injection port (58) may be only one on the timer (20) side.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical right side view of a drive unit for a fuel injection pump used in an engine according to a first embodiment of the present invention. FIG. 2A is a vertical right side view, FIG. 2B is a cross-sectional view taken along line BB of FIG. 2A, and FIG. 2C is a diagram illustrating a timer used in the engine of FIG. It is CC sectional view taken on the line of 2 (A). 3A is a cross-sectional view taken along line AA of FIG. 3B, FIG. 3B is a plan view, and FIG. 3C is a partially cutaway side view; 3D is a cross-sectional view taken along the line D-D in FIG. 3A, FIG. 3E is a view taken in the direction of the arrow E in FIG. 3B, and FIG. FIG. FIG. 4A is a diagram for explaining a temperature sensing operation state of the temperature sensing means of the timer of FIG. 2, FIG. 4A is an operation state when the engine is cold start, and FIG. 4B is an operation state when the engine is warm. Indicates. FIGS. 5A and 5B are diagrams illustrating a state in which the advance angle of the timer of FIG. 2 is limited, FIG. 5A shows a state when the engine is cold started, and FIG. 5B shows a state when the engine is warm. 6A and 6B are graphs showing characteristics of the advance angle limited state of the timer of FIG. 2, in which FIG. 6A shows a state when the engine is cold started, and FIG. 6B shows a state when the engine is warm. It is a schematic diagram which shows the whole plane of the engine of FIG. FIGS. 8A and 8B are views for explaining a main part of an engine according to a second embodiment of the present invention, in which FIG. 8A is a cross-sectional plan view of the main part, and FIG. 9A is a view taken in the direction of the arrow IX in FIG. 8A, FIG. 9B is a cross-sectional view taken along line BB in FIG. 9A, and FIG. 9C is C in FIG. FIG. FIG. 9 is a cross-sectional view taken along line XX in FIG. 8 (A), illustrating the operation of the eccentric cam mechanism. FIG. 11A is a diagram for explaining the advance operation of the timer, and FIG. 11B is a diagram for explaining the advance release operation.

DESCRIPTION OF SYMBOLS 1 ... Interlocking upper part 1b ... Interlocking upper gear 2 ... Interlocking lower part 2b ... Interlocking lower rotating shaft 2c ... Sleeve 3e ... Cam interlocking part 4 ... Eccentric cam mechanism 7 ... Temperature sensing operation means 8 ... Shape memory spring 20 ... Timer 25 ... Large diameter disk cam 27 ... Small diameter disk cam 49 ... Crankshaft 56 ... Engine oil 57 ... Oil pump 58 ... Oil injection port 59 ... Cam holder 76 ... Gear case

Claims (23)

The interlocking lower part (2) is connected to the interlocking upper part (1) near the crankshaft (49) via the timer (20), and the timer (20) is provided with a temperature-sensing operation means (7). At the time of cold start when the temperature sensing temperature of the temperature actuating means (7) is less than a predetermined value, the interlocking lower part (2) is moved by the advance operation of the timer (20) based on the temperature sensing action of the temperature sensing actuating means (7). When the engine is warm when the temperature sensing temperature of the temperature sensing means (7) exceeds a predetermined value, the timer (20) is released from the advance angle based on the temperature sensing action of the temperature sensing means (7). In the engine that releases the advance angle of the interlocked lower part (2),
The engine oil (56) pumped by the oil pump (57) is circulated in the engine, the oil injection port (58) is communicated with the oil pump (57), and the engine oil injected from the oil injection port (58) ( 56) is supplied to the timer (20) so that the engine oil (56) is brought into contact with the temperature sensitive operating means (7) .
The timer (20) is disposed in the gear case (76), the oil injection port (58) is opened in the gear case (76), and the engine oil (56) injected from the oil injection port (58) is discharged from the timer (20). An engine characterized by flowing out into a gear case (76). The interlocking lower part (2) is connected to the interlocking upper part (1) near the crankshaft (49) via the timer (20), and the timer (20) is provided with a temperature-sensing operation means (7). At the time of cold start when the temperature sensing temperature of the temperature actuating means (7) is less than a predetermined value, the interlocking lower part (2) is moved by the advance operation of the timer (20) based on the temperature sensing action of the temperature sensing actuating means (7). When the engine is warm when the temperature sensing temperature of the temperature sensing means (7) exceeds a predetermined value, the timer (20) is released from the advance angle based on the temperature sensing action of the temperature sensing means (7). In the engine that releases the advance angle of the interlocked lower part (2),
The engine oil (56) pumped by the oil pump (57) is circulated in the engine, the oil injection port (58) is communicated with the oil pump (57), and the engine oil injected from the oil injection port (58) ( 56) is supplied to the timer (20) so that the engine oil (56) is brought into contact with the temperature sensitive operating means (7).
The temperature sensing means (7) is composed of a shape memory spring (8),
The timer (20) is composed of a cam interlocking part (3e) and an eccentric cam mechanism (4).
In the eccentric cam mechanism (4), disc cams (25) and (27) are attached to a cam holder (59), and the disc cams (25) and (27) are connected to the shape memory spring (8) via the cam interlocking portion (3e). ), And an advance angle operation and an advance angle release operation of the timer (20) are performed based on the expansion / contraction deformation operation of the shape memory spring (8). The engine according to claim 2,
The timer (20) is disposed in the gear case (76), the oil injection port (58) is opened in the gear case (76), and the engine oil (56) injected from the oil injection port (58) is discharged from the timer (20). An engine characterized by flowing out into a gear case (76). The engine according to claim 1 or claim 3 ,
The interlocking superior part (1) is composed of the interlocking superior gear (1b),
The rotating lower hand portion (2) is composed of a sleeve (2c) fixed to the rotating interlocked lower shaft (2b). The axial length direction of the sleeve (2c) is the front-rear direction, and the timer (20) and the interlocking upper gear (1b) And an outer fit on the sleeve (2c). The engine according to claim 4 ,
An engine characterized in that a recess (1c) is provided on one of the front and rear surfaces of the interlocking upper gear (1b), and at least a part of the timer (20) is accommodated in the recess (1c). The engine according to claim 4 or 5 ,
The oil injection port (58) faces the sleeve (2c), the oil outlet (2d) is provided on the peripheral wall of the sleeve (2c), and the engine oil injected from the oil injection port (58) into the sleeve (2c) An engine characterized in that (56) flows out of the oil outlet (2d), is supplied to the timer (20), and comes into contact with the temperature-sensitive operating means (7). The engine according to claim 6,
The timer (20) is composed of a cam interlocking part (3e) and an eccentric cam mechanism (4).
The cam interlocking portion (3e) is composed of a pair of centrifugal weights (3) and (3), and the pair of centrifugal weights (3) and (3) are placed along the guide plates (88) and (88).
The eccentric cam mechanism (4) is constructed by attaching disc cams (25) and (27) to a cam holder (59), and the disc cams (25) and (27) are temperature-sensitively operated via a cam interlocking portion (3e). When interlocking with the means (7) and performing the advance angle operation and the advance angle release action of the timer (20) based on the temperature sensing operation of the temperature sensing operation means (7),
The engine oil (56) that flows out from the oil outlet (2d) and is supplied to the timer (20) is also supplied between the centrifugal weight (3) and the guide plate (88). A featured engine. The engine according to any one of claims 1 and 3 to 7 ,
An engine characterized in that an oil injection port (58) is arranged on a wall of a gear case (76). The engine according to claim 8,
An external pipe (58a) is provided outside the engine machine wall, and the oil gallery (58c) in the cylinder block (58b) communicates with the oil injection port (58) of the gear case (76) through the external pipe (58a). , An engine characterized by that. The engine according to any one of claims 4 to 7 ,
When fixing the sleeve (2c) to the interlocking lower rotation shaft (2b) with the fastener (2e),
An engine characterized in that a fastener (2e) is accommodated in a sleeve (2c). The interlocking lower part (2) is connected to the interlocking upper part (1) near the crankshaft (49) via the timer (20), and the timer (20) is provided with a temperature-sensing operation means (7). At the time of cold start when the temperature sensing temperature of the temperature actuating means (7) is less than a predetermined value, the interlocking lower part (2) is moved by the advance operation of the timer (20) based on the temperature sensing action of the temperature sensing actuating means (7). When the engine is warm when the temperature sensing temperature of the temperature sensing means (7) exceeds a predetermined value, the timer (20) is released from the advance angle based on the temperature sensing action of the temperature sensing means (7). In the engine that releases the advance angle of the interlocked lower part (2),
The engine oil (56) pumped by the oil pump (57) is circulated in the engine, the oil injection port (58) is communicated with the oil pump (57), and the engine oil injected from the oil injection port (58) ( 56) is supplied to the timer (20) so that the engine oil (56) is brought into contact with the temperature sensitive operating means (7).
The timer (20) is composed of a pair of centrifugal weights (3) and (3) and an eccentric cam mechanism (4), and each centrifugal weight (3) is urged in the centripetal direction by a weight return spring (5) having a compression coil spring structure. The eccentric cam mechanism (4) is linked and connected to each centrifugal weight (3),
Each centrifugal weight (3) is operated by the unbalanced force between the centrifugal force of each centrifugal weight (3) and the biasing force of the weight return spring (5), and each centrifugal weight (3) is operated in the centrifugal direction. Through the eccentric cam mechanism (4), the interlocking lower hand part (2) is advanced with respect to the interlocking upper hand part (1), and the eccentric cam mechanism (4 ) To retard the interlocking lower part (2) relative to the interlocking upper part (1),
Each centrifugal weight (3) is interlocked with a starting advance spring (6) of a compression coil spring structure, and this starting advance spring (6) is interlocked with a temperature sensitive operating means (7). Based on the temperature-sensing operation state of the temperature-sensing operation means (7), the starting advance spring (6) is maintained in an expandable state, and a pair of centrifuges are produced by the spring force of the starting advance spring (6). The weights (3) and (3) are spread out to the cold start advance position (Ac), and when the engine is warm, the start advance spring (6) is selected based on the temperature sensing operation state of the temperature sensing means (7). ) In a contracted state so that the spring force of the starting advance spring (6) does not act on the pair of centrifugal weights (3) and (3),
A shape memory spring (8) having a compression coil spring structure is used as the temperature sensitive operating means (7), and the shape memory spring (8) and the starting advance spring (6) are concentric with the weight return spring (5). Interpose between a pair of centrifugal weights (3) and (3) in a posture ,
Of the pair of centrifugal weights (3) and (3), a weight return spring (5) is accommodated in a spring accommodation hole (3a) formed in one centrifugal weight (3), and the other centrifugal weight (3) is contained. A starting advance spring (6) and a shape memory spring (8) are accommodated in the spring accommodating hole (3a) formed in
An engine characterized in that the shape memory spring (8) and the starting advance spring (6) have an internal / external double structure. The engine according to claim 11 , wherein
A first spring seat (3b) is provided on the inner bottom of the spring accommodating hole (3a) of the centrifugal weight (3) that accommodates the starting advance spring (6), and the starting advance angle is provided on the first spring seat (3b). The base end portion (12) of the spring for spring (6) is seated, and the transmission cylinder (9) is concentrically arranged in the spring for starting advance (6), and the tip of the spring for starting advance (6) is arranged. A first spring retainer (10) is provided outwardly at the tip of the transmission cylinder (9) close to the portion, and the tip (13) of the starting advance spring (6) is received by the first spring retainer (10). The first spring retainer (10) is brought into contact with the retainer receiving surface (3c) of the centrifugal weight (3) containing the weight return spring (5),
A shaft (14) is attached to the centrifugal weight (3) containing the starting advance spring (6), and this shaft (14) is concentrically disposed in the transmission cylinder (9). A second spring seat (14a) is provided, and the base end portion (15) of the shape memory spring (8) is seated on the second spring seat (14a), and the shape memory spring (8) is transmitted to the shaft (14). The second spring retainer (11) is placed inwardly at the distal end of the transmission cylinder (9), which is concentrically disposed between the cylinder (9) and the distal end (16) of the shape memory spring (8). The second spring retainer (11) receives the tip (16) of the shape memory spring (8),
When the engine is cold started, the starting advance spring (6) is maintained in an expandable state based on the temperature sensing operation state of the contracted shape memory spring (8). By causing the spring force of this to act on the first spring seat (3b) and the retainer receiving surface (3c), the pair of centrifugal weights (3) and (3) can be pushed and expanded to the cold start advancement position (Ac). West,
When the engine is warm, the starting advance spring (6) is maintained in a contracted state based on the temperature sensing operation state of the extended shape memory spring (8), and the spring force of the starting advance spring (6) is maintained. The engine is characterized in that it does not act on the first spring seat (3b) and the retainer receiving surface (3c). The interlocking lower part (2) is connected to the interlocking upper part (1) near the crankshaft (49) via the timer (20), and the timer (20) is provided with a temperature-sensing operation means (7). At the time of cold start when the temperature sensing temperature of the temperature actuating means (7) is less than a predetermined value, the interlocking lower part (2) is moved by the advance operation of the timer (20) based on the temperature sensing action of the temperature sensing actuating means (7). When the engine is warm when the temperature sensing temperature of the temperature sensing means (7) exceeds a predetermined value, the timer (20) is released from the advance angle based on the temperature sensing action of the temperature sensing means (7). In the engine that releases the advance angle of the interlocked lower part (2),
The engine oil (56) pumped by the oil pump (57) is circulated in the engine, the oil injection port (58) is communicated with the oil pump (57), and the engine oil injected from the oil injection port (58) ( 56) is supplied to the timer (20) so that the engine oil (56) is brought into contact with the temperature sensitive operating means (7).
The first advance angle limiting body (41) and the second advance angle limiting body (42) are linked to the shape memory spring (8) via the output means (39) and the limit switching means (44) so as to be switchable. ,
At the time of cold start of the engine, the first advance limiter (41) can be limited via the output means (39) and the limit switching means (44) based on the temperature sensing operation state of the shape memory spring (8). The upper limit of the operation in the centrifugal direction of each centrifugal weight (3) is limited to the first advance limit position (L1) by the first advance limiter (41),
When the engine is warm, the second advance limiter (42) can be limited via the output means (39) and the limit switching means (44) based on the temperature sensing operation state of the shape memory spring (8). By means of this second advance angle restricting body (42), the upper limit of the operation of each centrifugal weight (3) in the centrifugal direction is restricted to the second advance angle restricting position (L2),
The second advance angle limit position (L2) lowers the upper limit of the operation in the centrifugal direction of each centrifugal weight (3) and lowers the upper limit of the advance angle (Θ) than the first advance angle limit position (L1). An engine characterized by that. The engine according to claim 13 ,
A rotary plate (44a) is used as the restriction switching means (44), and the rotary plate (44a) is provided on one side of a pair of centrifugal weights (3) and (3). It can be rotated around the rotation center line (18) of the part (2),
A first advance angle restricting hole (46) and a second advance angle restricting hole (47) are formed in the rotating plate (44a), and the first advance angle restricting hole (46) and the second advance angle restricting hole (47) are formed. Are arranged in the rotational direction of the centrifugal weight (3) and communicated with each other to form a communication hole (45),
The first advance angle restricting body (41) is disposed at the distal peripheral edge portion of the first advance angle limiting hole (46), and the second advance angle restricting body is disposed at the distal peripheral edge portion of the second advance angle restricting hole (47). (42) is formed, and an engagement protrusion (48) is protruded from each centrifugal weight (3) into the communication hole (45),
At the time of cold start of the engine, based on the temperature sensitive operation state of the shape memory spring (8), the rotating plate (44a) is set to the first rotation posture, and the engagement protrusion is formed by the first advance limiter (41). (48) can be received,
When the engine is warm, based on the temperature sensing operation state of the shape memory spring (8), the rotating plate (44a) is set in the second rotation posture, and the engagement protrusion ( 48) An engine characterized by being capable of receiving. 15. The engine according to claim 14 ,
The rotating plate (44a) is provided on one side of the pair of centrifugal weights (3) (3), whereas the eccentric cam mechanism (4) is provided on the other side of the pair of centrifugal weights (3) (3). The pin (28) is passed through each centrifugal weight (3), one end of the pin (28) is used as the engaging protrusion (48), and the other end of the pin (28) is connected to each An engine comprising an output pin (3d) from the centrifugal weight (3) to the eccentric cam mechanism (4). The engine according to claim 14 or 15 ,
An output pin (39a) is used as an output means (39) from the shape memory spring (8), an engagement hole (38) is formed in the rotating plate (44a), and the output pin is inserted into the engagement hole (38). An engine characterized by engaging (39a). The interlocking lower part (2) is connected to the interlocking upper part (1) near the crankshaft (49) via the timer (20), and the timer (20) is provided with a temperature-sensing operation means (7). At the time of cold start when the temperature sensing temperature of the temperature actuating means (7) is less than a predetermined value, the interlocking lower part (2) is moved by the advance operation of the timer (20) based on the temperature sensing action of the temperature sensing actuating means (7). When the engine is warm when the temperature sensing temperature of the temperature sensing means (7) exceeds a predetermined value, the timer (20) is released from the advance angle based on the temperature sensing action of the temperature sensing means (7). In the engine that releases the advance angle of the interlocked lower part (2),
The engine oil (56) pumped by the oil pump (57) is circulated in the engine, the oil injection port (58) is communicated with the oil pump (57), and the engine oil injected from the oil injection port (58) ( 56) is supplied to the timer (20) so that the engine oil (56) is brought into contact with the temperature sensitive operating means (7).
The timer (20) is constituted by an eccentric cam mechanism (4), and the cam holder (59) and the cam drive plate (60) are arranged so as to overlap each other, and the disc cams (25) (25) (27) are placed on the cam holder (59). (27) is attached, input pins (65) and (65) are attached to predetermined disc cams (25) and (25), and guide holes (67) and (67) are provided in the cam drive plate (60). Input pins (65) and (67) are fitted in (67) and (67), and the end surface (60a) of the cam drive plate (60) and the end surface of the cam holder (59) exposed beside the cam drive plate (60) ( 59a) is provided with a pair of support portions (60b) and (59b), and the temperature sensitive operation means (7) is disposed between the pair of support portions (60b) and (59b) in an exposed state. Based on the deformation of the means (7), the cam drive plate (60) is rotated, and the disc cams (25) (27) through the guide holes (67) (67) and the input pins (65) (65). To advance the timer (20) And to perform the advance deactivated, the engine, characterized in that. The engine according to claim 17 ,
The sleeve (2c) has an axial length direction in the front-rear direction, one of which is the rear and the other is the front, and the sleeve (2c) is in turn an interlocking upper gear (1b) that becomes an interlocking upper part (1) and a cam holder ( 59) and the cam drive plate (60) are attached to each other,
A pair of support portions (60b) (59b) project from the rear end surface (60a) of the cam drive plate (60) and the rear end surface (59a) of the cam holder (59) exposed beside the cam drive plate (60). Between the pair of support portions (60b) and (59b), the temperature sensitive operation means (7) is disposed in an exposed state,
The interlocking upper gear (1b) and the idle gear (69) mesh with each other, and the idle gear (69) and the pivot (70) are connected to each other by an oil supply passage (71) provided in the pivot (70) of the idle gear (69). The engine oil (56) is supplied during this period, the extension passage (72) is led out from the oil supply passage (71), and the lead-out end of the extension passage (72) is used as the oil injection port (58). A featured engine. The engine according to claim 18 ,
An idle gear (69) is fitted to the pivot (70), a retaining plate (74) is attached to the tip surface (70a) of the pivot (70), and the idle gear (69) is retained by the retaining plate (74). A groove-like extension passage (72) along the tip surface (70a) of the pivot (70) is formed on the back surface of the retaining plate (74), and an oil injection port (58) is formed on the periphery of the retaining plate (74). An engine characterized by having an opening. The engine according to any one of claims 17 to 19,
The timer (20) is disposed in the gear case (76), the oil injection port (58) is opened in the gear case (76), and the engine oil (56) injected from the oil injection port (58) is discharged from the timer (20). An engine characterized by flowing out into a gear case (76). The engine according to claim 20,
The interlocking superior part (1) is composed of the interlocking superior gear (1b),
The rotating lower hand portion (2) is composed of a sleeve (2c) fixed to the rotating interlocked lower shaft (2b). The axial length direction of the sleeve (2c) is the front-rear direction, and the timer (20) and the interlocking upper gear (1b) And an outer fit on the sleeve (2c). The engine according to claim 21,
An engine characterized in that a recess (1c) is provided on one of the front and rear surfaces of the interlocking upper gear (1b), and at least a part of the timer (20) is accommodated in the recess (1c). The engine according to any one of claims 17 to 22,
The temperature sensing means (7) is composed of a shape memory spring (8),
The timer (20) is composed of a cam interlocking part (3e) and an eccentric cam mechanism (4).
  In the eccentric cam mechanism (4), disc cams (25) and (27) are attached to a cam holder (59), and the disc cams (25) and (27) are connected to the shape memory spring (8) via the cam interlocking portion (3e). ), And an advance angle operation and an advance angle release operation of the timer (20) are performed based on the expansion / contraction deformation operation of the shape memory spring (8).

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