JP4431092B2 - Advance device for cold start of diesel engine - Google Patents

Description

  The present invention relates to an advance device for a cold start of a diesel engine.

[Prerequisite configuration]
The diesel engine cold start advancement device of the present invention is intended for a device having the following premise configuration as shown in FIG. 3 (present invention) or FIG. 5 (prior art), for example.

FIG. 3 shows a start-up device for a cold start of a diesel engine according to Embodiment 1 of the present invention. 3A is a longitudinal front view, FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A, and FIG. 3C is a right side view of FIG.
FIG. 5 shows an advance device for a cold start of a diesel engine according to the prior art. 5A is a longitudinal front view, FIG. 5B is a cross-sectional view taken along the line BB in FIG. 5A, and FIG. 5C is a cross-sectional view taken along the line CC in FIG.

The output wheel (3) is linked and connected to the input wheel (2) through the eccentric rotation cam type advance mechanism (1).
The advance angle input position (4) of the eccentric rotation cam type advance mechanism (1) is advanced by the advance operation mechanism (5), and the advance operation position on the far side when viewed from the rotation axis (6) of the input wheel (2). It is possible to switch to the advance angle release position (8) closer to (7).

  The eccentric rotation cam type advance mechanism (1) has an output wheel (3) for the input wheel (2) in the advance operation state in which the advance input tool (4) is located at the advance operation position (7). In contrast to the advance angle, the advance angle input tool (4) is configured to cancel the advance angle in the advance angle cancel operation state in which the advance angle input tool (4) is positioned at the advance angle cancel position (8).

The advance angle operating mechanism (5) includes an advance angle drive spring (9) and an advance angle release temperature sensitive actuator (10). At the time of cold start, the temperature-sensing actuator (10) for canceling the advance angle is contracted based on the sensed temperature, and the advance input tool (4) is moved to the advance operation position by the tension of the advance drive spring (9) ( Move to 7).
On the other hand, when the temperature of the machine rises after the start of the cold machine, the advance angle canceling temperature sensitive actuator (10) is extended based on the detected temperature, and the advance angle canceling temperature sensitive actuator (10) is extended. The advance angle input tool (4) is configured to move to the advance angle release position (8) by power.

[Conventional technology]
In the above premise configuration, as a specific configuration of the advance angle operation mechanism (5), there is one shown in FIGS. (Japanese Patent Laid-Open No. 2004-3000986)

5-7 show the prior art. FIG. 5 shows an advance device for a cold start of a diesel engine. 5A is a longitudinal front view, FIG. 5B is a cross-sectional view taken along the line BB in FIG. 5A, and FIG. 5C is a cross-sectional view taken along the line CC in FIG.
FIG. 6 shows the advance angle operation mechanism 5 in FIG. 6A is a cross-sectional view taken along line AA of FIG. 6B, FIG. 6B is a plan view of FIG. 6A, FIG. 6C is a left side view of FIG. FIG. 6D is a cross-sectional view taken along the line DD of FIG.
FIG. 7 shows the advance operation state of the advance operation mechanism 5, and is an extraction view of a portion VII in FIG. 6 (A). FIG. 7A shows the advance operation state when the engine is cold. FIG. 7B shows a state in which the advance angle is released when the air temperature rises after the start of the cold machine is completed.

In this prior art, as shown in FIGS. 5 and 6, the advance angle operating mechanism (5) includes a pair of centrifugal weights (61), a pair of weight return springs (62), and a pair of spring bearing shafts ( 66) A pair of advance drive springs (9), a pair of advance release temperature sensor (10), and a pair of advance release actuators (10) It consists of two pairs of telescopic action reversing tools (64) and (65) for reversing.

  Each advance angle input tool (4) of the pair of eccentric rotating cam type advance mechanism (1) is fixed to each pair of centrifugal weights (61). Between the pair of centrifugal weights (61), two pairs of weight return springs (62) are attached via a pair of spring bearing shafts (66). A pair of temperature release actuators for releasing the advance angle (10) is sandwiched between two pairs of telescopic operation reversing tools (64) and (65). A pair of temperature-sensitive actuators (10) for canceling the advance angle and two pairs of telescopic operation reversing tools (64) (65) are assembled between the pair of centrifugal weights (61). It is a thing.

  The expansion / contraction operation reversing tools (64) and (65) are for reversing the expansion / contraction operation of the advance angle canceling temperature sensitive actuator (10). As shown in FIG. 7 (A), at the time of cold start, the temperature-sensing actuator (10) for canceling the advance angle is contracted based on the sensed temperature, and the expansion / retraction operation reversing tool (64) (65) extends. Then, the advance drive spring (9) pushes and opens the centrifugal weights (61) to operate the advance input device (4) to the advance operation position (7). As shown in FIG. 7 (B), when the air temperature rises after the completion of the cold start, the advance angle canceling temperature sensitive actuator (10) is in the extended state based on the sensed temperature, and the telescopic operation reversing tool (64) ( 65) The members are contracted, the weight return spring (62) pushes and closes the centrifugal weights (61), and the advance angle input tool (4) is operated to the advance angle release position (8).

[Problems of conventional technology]
The above prior art has the following problems.
[Problem a. The minimum required number of components of the advance angle operating mechanism (5) also requires a total of 16 points. ]

  In this prior art, as shown in FIGS. 5 and 6, the minimum necessary number of components of the advance operation mechanism (5) is two pairs of centrifugal weights (61) and two weight return springs (62). 4 pairs, 1 pair of spring bearing shafts (66), 2 pairs of advance drive springs (9), 2 pairs of temperature sensitive actuators (10) for releasing the advance angle In addition, 2 pairs = 4 pieces of expansion / contraction reversing tools (64) and 65 for reversing the expansion / contraction operation of the advance angle canceling temperature sensitive actuator (10) are required, and a total of 16 points are required.

JP 2004-3000986 A

An object of the present invention is to do as follows.
[I]. Reduce the minimum number of components required for the advance operation mechanism.
[B]. A pair of eccentric rotating cam type advance mechanisms are operated in synchronism with each other with high precision, so that the advance angle operation and the advance angle release operation are smoothly advanced without twisting each other. The operation sensitivity and the operation accuracy of the switching operation to the state and the advance angle release state are increased.

[C]. The pair of eccentric rotating cam type advance mechanisms are operated in synchronism with each other with high precision, thereby smoothly advancing and canceling the advance operation without causing twisting and being hardly worn. And improve durability.
[D]. By reducing the positional displacement of the reciprocating rotary plate relative to the eccentric rotary cam type advance mechanism, the dimensional error of the drive position of the advance input tool of the eccentric rotary cam type advance mechanism due to the tilt cam of the advance operation mechanism is reduced. Thus, the control accuracy to the advance angle operation position at the start of the cold machine and the advance angle release position at the time when the body temperature rises after the completion of the cold machine start is increased.

[E]. The advance angle drive spring and the advance angle release temperature sensitive actuator can be configured at low cost, and the advance angle drive spring and the advance angle release temperature sensitive actuator can each be configured by a large coil spring. The advance angle operation force at the start of the cold machine and the advance angle release operation force when the machine temperature rises after the start of the cold machine are strengthened, and the operation capability / operation speed and operation accuracy of the advance angle release and advance angle release operations To increase.
[F]. The compression coil spring made of shape memory alloy that constitutes the temperature sensitive actuator for advancing the advance angle is extended for a long time by the expansion rod both in the extended state when the air temperature rises after the completion of the cold start and in the contracted state when the cold start. It is made to be excellent in durability by holding it linearly and stably.

  In order to solve the above-mentioned problems, the diesel engine cold start advancement device for a diesel engine according to the present invention has a specific configuration of the advance operation mechanism (5) as illustrated in FIGS. 1 and 4, for example. As a feature, the following feature configuration is added.

  FIG. 1 to FIG. 4 show Embodiment 1 of a cold start start angle device for a diesel engine according to the present invention. FIG. 1 shows an advance operation mechanism 5 of an advance device for a cold start of a diesel engine. FIG. 1A is a longitudinal front view, and is an enlarged view of the IA portion of FIG. 1B is a right side view of FIG. 1A, FIG. 1C is a cross-sectional view taken along the line CC of FIG. 1B, and FIG. 1D is a DD line of FIG. It is line sectional drawing.

  FIG. 4 shows the operating state of the advance operation mechanism 5 of the advance device at the time of cold start of the diesel engine. FIG. 4 (A) shows a state in which the advance angle is released when the body temperature rises after completion of the cold start, and is the same diagram as FIG. 1 (B). FIG. 4B shows the advance operation state at the time of cold start.

The invention of claim 1. See FIG. 1 and FIG.
The advance angle operating mechanism (5) includes a reciprocating rotation plate (11) in addition to the advance angle drive spring (9) and the advance angle release temperature sensitive actuator (10).

  The reciprocating rotary plate (11) is provided facing the input wheel (2) so as to be reciprocally rotatable about the rotation axis (6) of the input wheel (2). The reciprocating rotary plate (11) is provided with an inclined cam (12) that is inclined with respect to its radial direction and rotational direction. The advance cam (4) of the eccentric rotary cam type advance mechanism (1) is cam-engaged with the inclined cam (12) so as to be driven.

  The advance drive spring (9) is stretched over the input wheel (2) and the reciprocating rotary plate (11), and the inclined cam (12) advances the advance input tool (4). The reciprocating rotary plate (11) is configured to be elastically pressed toward the advance drive rotation (13) that is driven to the operation position (7).

  On the other hand, the advance angle canceling temperature sensitive actuator (10) is stretched over the input wheel (2) and the reciprocating rotary plate (11), and in the extended state, the advance angle driving spring. Against (9), the inclined cam (12) reciprocates the rotating plate (11) toward the advance angle release rotation (14) side that drives the advance angle input tool (4) to the advance angle release position (8). It is comprised so that it may act | operate.

O Invention of claim 2. See FIG.
The invention of claim 2 is characterized in that, in the invention of claim 1, the following characteristic configuration is added.

  An input shaft (16) is extended from the center of the input wheel (2) toward the reciprocating rotary plate (11). A cylindrical shaft (17) is extended from the center of the reciprocating rotary plate (11) in the same direction as the input shaft (16). The reciprocating rotary plate (11) and the cylindrical shaft (17) are externally fitted to the input shaft (16) so as to be reciprocally rotatable.

The invention of claim 3. See FIG. 1 and FIG.
The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the following characteristic configuration is added.

The advance angle canceling temperature sensitive actuator (10) comprises a compression coil spring (19) made of a shape memory alloy, and the advance angle driving spring (9) comprises a tension coil spring (20).
The compression coil spring (19) and the tension coil spring (20) made of the shape memory alloy are disposed at positions opposite to each other with the rotation axis (6) of the input wheel (2) interposed therebetween. It is characterized by.

The invention of claim 4. See FIG.
The invention of claim 4 is characterized in that, in the invention of claim 3 described above, the following characteristic configuration is added.

  The proximal end portion and the distal end portion of the compression coil spring (19) made of the shape memory alloy are received by the spring proximal end receiver (22) and the spring distal end receiver (23), respectively. The spring base end support (22) is supported by the input wheel (2), and the spring front end support (23) is supported by the reciprocating rotary plate (11) so as to be swingable.

  An elastic rod (24) for preventing buckling of the spring is passed through the compression coil spring (19) made of the shape memory alloy. One of the outer fitting tube (25) and the inner fitting rod (26) constituting the telescopic rod (24) is fixed to the spring proximal end receiving device (22), and the other is attached to the spring distal end receiving device ( It is characterized by being fixed to 23).

The diesel engine cold start advance device of the present invention has the following effects.
The invention of claim 1. See FIG. 1 and FIG.

  [Effect a. The minimum required number of components of the advance angle operating mechanism (5) is reduced to 3 in the invention of the present invention, compared to 16 in the prior art, and greatly reduced to 1/5 or less. Therefore, the configuration can be simplified and the parts cost and manufacturing cost can be greatly reduced. ]

The invention of claim 1 has the following characteristic configuration.
The advance angle operating mechanism (5) includes a reciprocating rotation plate (11) in addition to the advance angle drive spring (9) and the advance angle release temperature sensitive actuator (10).

  The reciprocating rotary plate (11) is provided facing the input wheel (2) so as to be reciprocally rotatable about the rotation axis (6) of the input wheel (2). The reciprocating rotary plate (11) is provided with an inclined cam (12) that is inclined with respect to its radial direction and rotational direction. The advance cam (4) of the eccentric rotary cam type advance mechanism (1) is cam-engaged with the inclined cam (12) so as to be driven.

  The advance drive spring (9) is stretched over the input wheel (2) and the reciprocating rotary plate (11), and the inclined cam (12) advances the advance input tool (4). The reciprocating rotary plate (11) is configured to be elastically pressed toward the advance drive rotation (13) that is driven to the operation position (7).

  On the other hand, the advance angle canceling temperature sensitive actuator (10) is stretched over the input wheel (2) and the reciprocating rotary plate (11), and in the extended state, the advance angle driving spring. Against (9), the inclined cam (12) moves the reciprocating rotary plate (11) to the advance angle release rotation (14) that drives the advance angle input tool (4) to the advance angle release position (8). Configured to work.

This characteristic configuration works as follows.
[A. Operation of advance angle operation mechanism (5) (Refer to Fig. 1 and Fig. 4)]
FIG. 1B and FIG. 4A illustrate that the advance angle operation mechanism (5) is operating in the advance angle release operation state when the body temperature rises after the completion of cold start.
When the body temperature rises after the start of the cold machine, the advance angle canceling temperature-sensing actuator (10) is extended based on the sensed temperature and reciprocatingly rotating against the advance drive spring (9). (11) is operated to the advance angle release rotation (14) side, and the inclined cam (12) drives the advance angle input tool (4) to the advance angle release position (8). As a result, the eccentric rotation cam type advance mechanism (1) is actuated to the advance angle release state, and the fuel injection timing of the fuel injection pump (29) is adjusted to the advance angle release state.

FIG. 4B illustrates that the advance angle operation mechanism (5) is operating in the advance angle operation state when the engine is cold.
When the engine starts cold, the advance angle canceling temperature-sensitive actuator (10) is contracted based on the sensed temperature, and the advance drive spring (9) advances the reciprocating rotary plate (11) to advance. The tilt cam (12) drives the advance angle input tool (4) to the advance angle operation position (7). As a result, the eccentric rotating cam type advance mechanism (1) is operated to the advance operation state, and the fuel injection timing of the fuel injection pump (29) is adjusted to the advance operation state.

[B. Minimum required number of components for advance angle control mechanism (5) (See Fig. 1)]
[A. As shown in FIG. 1, the minimum required number of components of the advance operation mechanism (5) for satisfying the operation of the advance operation mechanism (5) is one reciprocating rotary plate (11). Advancing drive spring (9) and advancing release temperature sensitive actuator for switching the reciprocating rotary plate (11) to advancing drive rotation side (13) and advancing release releasing rotation side (14) (10) is only one by one and can be reduced to a total of only three points.

  That is, the minimum required number of component parts of the advance angle operating mechanism (5) is, as described in the paragraph numbers [0012] to [0013], as shown in FIGS. One pair of weights (61) = 2, two pairs of weight return springs (62) = 4, one pair of spring bearing shafts (66), and one pair of advance drive springs (9) = 2 A pair of two temperature-sensitive actuators (10) for advancing the release angle, and a telescopic reversing tool (64) (65) for reversing the expansion / contraction operation of the temperature-sensing actuator (10) for releasing the advance angle 2 pairs = 4 pieces are necessary, and the total number of points is 16 points. In the invention of claim 1, as shown in FIG. 1, one reciprocating rotary plate (11) is used for advance driving. One spring (9) and one advance angle canceling temperature sensitive actuator (10) can be reduced to a total of only three points.

  That is, the minimum required number of components of the advance angle operating mechanism (5) is reduced to 3 in the invention of claim 1 to 16 or less than 16 in the prior art. The configuration can be simplified and the component cost and manufacturing cost can be greatly reduced by the amount that can be significantly reduced.

  [Effect b. The pair of inclined cams (12) and (12) allows the pair of advance angle input tools (4) and (4) to be simultaneously moved at the same speed between the advance operation position (7) and the advance release position (8). Since the same dimension is driven, the pair of eccentric rotating cam type advance mechanisms (1) and (1) operate in synchronism with each other with high precision. Since the process proceeds smoothly without twisting each other, the operation sensitivity and the operation accuracy of the switching operation to the advance angle operation state and the advance angle release state can be improved. ]

The invention of claim 1 has the following characteristic configuration.
The reciprocating rotary plate (11) is provided so as to face the input wheel (2) so as to be able to reciprocate around the rotation axis (6) of the input wheel (2). The reciprocating rotary plate (11) is provided with an inclined cam (12) that is inclined with respect to its radial direction and rotational direction. The advance cam (4) of the eccentric rotary cam type advance mechanism (1) is cam-engaged with the inclined cam (12) so as to be driven.

This characteristic configuration works as follows.
As illustrated in FIG. 1, the reciprocating rotary plate (11) reciprocally rotates around the rotation axis (6) with respect to the input wheel (2), so that the reciprocating rotary plate (11) The both inclined cams (12) and (12) provided are a pair of both angle advancement input tools (4) (4) of the pair of eccentric rotation cam type advancement mechanisms (1) and (1) provided on the input wheel (2). 4) is driven at the same speed and the same dimension at the same time between the advance operation position (7) and the advance release position (8).

  For this reason, the pair of eccentric rotating cam type advance mechanisms (1) and (1) operate in synchronism with each other with high precision, so that the advance operation and the advance release operation are not distorted. Since the operation proceeds smoothly, the operation sensitivity and operation accuracy of the switching operation to the advance angle operation state and the advance angle release state can be improved.

  [Effect C. The pair of eccentric rotating cam type advance mechanisms (1) and (1) operate in synchronism with each other with high precision, and thus advance and release advance operations smoothly proceed without causing any twisting. As much as it becomes, it becomes hard to be worn and durability is improved. ]

  As described in [Effect B] above, the pair of eccentric rotating cam type advance mechanisms (1) and (1) operate in synchronism with each other with high precision, and therefore advance operation and advance advance cancellation. As the operation proceeds smoothly without twisting each other, the wear becomes difficult and the durability is improved.

O Invention of claim 2. See FIG.
The invention of claim 2 has the following effects in addition to the effects [Effects], [Effects B] and [Effects C] of the invention of Claim 1 above.

  [Effects d. The advance angle input tool (4) of the eccentric rotation cam type advance mechanism (1) by the inclined cam (12) by the amount of the positional deviation of the reciprocating rotation plate (11) with respect to the eccentric rotation cam type advance mechanism (1) is reduced. ) Of the drive position is reduced, and the control accuracy to the advance angle operation position (7) at the start of the cold machine and the advance angle release position (8) when the body temperature rises after the start of the cold machine is increased. ]

The invention of claim 2 has the following characteristic configuration.
An input shaft (16) is extended from the center of the input wheel (2) toward the reciprocating rotary plate (11). A cylindrical shaft (17) is extended from the center of the reciprocating rotary plate (11) in the same direction as the input shaft (16). The reciprocating rotary plate (11) and the cylindrical shaft (17) were externally fitted to the input shaft (16) so as to be capable of reciprocating rotation.

This characteristic configuration works as follows.
As illustrated in FIGS. 1 (A) and 1 (B), the length of the boss hole in which the reciprocating rotary plate (11) is externally fitted to the input shaft (16) of the input wheel (2) so as to be reciprocally rotatable, In addition to the thickness of the reciprocating rotating plate (11), the rotation of the reciprocating rotating plate (11) with respect to the rotational axis (6) of the input wheel (2) is increased by the extra length of the extension of the cylindrical shaft (17). The maximum degree of inclination of the shaft center is limited to be small.

  As a result, the reciprocating rotary plate (11) with respect to the eccentric rotating cam type advance mechanism (1) provided on the input wheel (2) is generated by the maximum inclination between the input wheel (2) and the reciprocating rotary plate (11). The dimensional error of the drive position of the advance angle input device (4) of the eccentric rotation cam type advance mechanism (1) by the inclined cam (12) is reduced by the amount of the position shift dimension, and the advance operation at the start of the cold machine Control accuracy to the position (7) and the advance angle release position (8) when the airframe temperature rises after the start of the cold machine can be improved.

The invention of claim 3. See FIG.
In addition to the [Effect A] / [Effect B] and [Effect C] of the invention of the above-mentioned Claim 1, the invention of Claim 3 has the following effects.

  [Effect E. Shape memory alloy compression coil spring (19) and tension coil spring (20) can be configured at low cost, and shape memory alloy compression coil spring (19) and tension coil spring (20) can interfere with each other. The large coil springs (19) and (20) can be used as much as possible to secure a large installation space, and the advance angle operation force at the start of the cold machine and the advance angle release operation when the machine temperature rises after the completion of the cold machine start Strengthen the force, and improve the operation ability, operation speed, and operation accuracy of the advance operation and advance release operation. ]

The invention of claim 3 has the following characteristic configuration.
The advance angle canceling temperature sensitive actuator (10) comprises a compression coil spring (19) made of a shape memory alloy. The advance driving spring (9) comprises a tension coil spring (20). The compression coil spring (19) and the tension coil spring (20) made of this shape memory alloy are arranged at positions opposite to each other with the rotation axis (6) of the input ring (2) interposed therebetween.

This characteristic configuration works as follows.
First, a compression spring (19) made of a shape memory alloy has a stable operation performance and can be obtained at a low cost. Next, the tension coil spring (20) does not buckle, and the structure for mounting can be simple and inexpensive.

  Then, the compression coil spring (19) and the tension coil spring (20) made of shape memory alloy interfere with each other by being arranged with respect to the reciprocating rotary plate (11) when being assembled in a predetermined space. The large coil springs (19) and (20) can be used as much as possible to secure a large installation space, and the advance angle operation force at the start of the cold machine and the advance angle release operation when the machine temperature rises after the completion of the cold machine start The force can be made strong, and the operation capability, operation speed, and operation accuracy of the advance operation and advance operation can be improved.

The invention of claim 4. See FIG. 1 and FIG.
In addition to [Effect A], [Effect B], [Effect C] of the invention of Claim 1 and [Effect E] of the invention of Claim 3, the invention of Claim 4 has the following effects. .

  [Effects. The compression coil spring (19) made of shape memory alloy is linearly stabilized over a long period of time by the expansion rod (24) in both the extended state when the air temperature rises after completion of cold start and the contracted state when cold start. Since it is well held, it has excellent durability. ]

The invention of claim 4 has the following characteristic configuration.
The proximal end portion and the distal end portion of the compression coil spring (19) made of the shape memory alloy are received by the spring proximal end receiver (22) and the spring distal end receiver (23), respectively. The spring base end support (22) is supported by the input wheel (2). The spring tip receiving tool (23) is swingably supported by the reciprocating rotary plate (11).
An elastic rod (24) for preventing buckling of the spring is passed through the compression coil spring (19) made of the shape memory alloy. One of the outer fitting cylindrical rod (25) and the inner fitting rod (26) constituting the telescopic rod (24) is fixed to the spring proximal end receiving member (22), and the other is fixed to the spring distal end receiving member. (23) fixed.

This characteristic configuration works as follows.
The compression coil spring (19) made of the shape memory alloy is contracted at the time of cold start illustrated in FIG. 4 (B) even in the extended state when the body temperature rises after completion of the cold start illustrated in FIG. 4 (A). Even in the state, it is excellent in durability because it is stably held in a straight line for a long time by the telescopic rod (24).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a diesel engine cold start advance device according to the present invention will be described below with reference to the drawings.
Embodiment 1 Claims 1, 2, 3, and 4. See FIGS. 1-4.

  FIG. 1 to FIG. 4 show Embodiment 1 of a cold start start angle device for a diesel engine according to the present invention. FIG. 1 shows an advance operation mechanism 5 of an advance device for a cold start of a diesel engine. FIG. 1A is a longitudinal front view, and is an enlarged view of the IA portion of FIG. 1B is a right side view of FIG. 1A, FIG. 1C is a cross-sectional view taken along the line CC of FIG. 1B, and FIG. 1D is a DD line of FIG. It is line sectional drawing.

FIG. 2 is a longitudinal front view of a transmission device from a fuel injection cam gear of a diesel engine to a fuel injection pump. FIG. 3 shows an advance device for a cold start of a diesel engine. FIG. 3A is a longitudinal front view, the same view as FIG. FIG. 3B is a cross-sectional view taken along the line BB in FIG. 3C is a right side view of FIG. 3A and is the same view as FIG.
FIG. 4 shows the operating state of the advance operation mechanism 5 of the advance device at the time of cold start of the diesel engine. FIG. 4 (A) shows a state in which the advance angle is released when the air temperature rises after the completion of the engine cold start, and is the same diagram as FIG. 1 (B). FIG. 4B shows the advance operation state when the engine is cold.

  In FIG. 2, reference numeral (27) denotes a right side wall of a cylinder block of the diesel engine, (28) denotes a fuel injection pump housing integrally cast on the right side wall (27), and (29) denotes a fuel injection pump. (30) is an advance device for a cold start of a diesel engine, (31) is a fuel injection cam gear, (32) is an input shaft of the advance device for a cold start (31), and (33) is a cylindrical fuel injection cam shaft It is. The power of the crankshaft (not shown) of the engine is transmitted from the fuel injection cam gear (31) to the fuel injection camshaft (23) via the input shaft (32) and the cold start timing advance device (30).

The diesel engine cold start advance device (30) is configured as follows.
As shown in FIGS. 1 and 3, an output wheel (3) is interlocked and connected to an input wheel (2) via an eccentric rotating cam type advance mechanism (1).

The eccentric rotating cam type advance mechanism (1) is configured as follows.
As shown in FIG. 3, a large-diameter eccentric ring (35) and a small-diameter eccentric ring (37) are fitted into the input ring (2) in order. A pair of large ring pivot support holes (34) are opened at two eccentric positions of the input wheel (2). The two eccentric positions are located symmetrically with respect to the rotational axis (6) of the input wheel (6). A pair of large-diameter eccentric rings (35) are rotatably fitted in the large-ring support holes (34). Each small wheel pivot support hole (36) is opened at an eccentric position of each large diameter eccentric ring (35). A pair of small ring eccentric rings (37) are rotatably fitted in the small ring pivot support holes (36).

Each large-diameter eccentric ring (35) has a lead angle input tool (4) made up of each eccentric input pin and is fixedly protruded. Each eccentric output pin (39) fitted inside each small wheel eccentric wheel (37) is fitted and fixed to the output wheel (3).
The cylindrical input shaft (16) of the input wheel (1) is fitted on the input shaft (32), fixed to the input shaft (32) with a nut (40), and rotated integrally with a key. It is connected. The output wheel (3) is externally fitted to the fuel injection cam shaft (33) and is connected so as to rotate integrally with the key.

  The advance angle input position (4) of the eccentric rotation cam type advance mechanism (1) is advanced by the advance operation mechanism (5), and the advance operation position on the far side when viewed from the rotation axis (6) of the input wheel (2). It is possible to switch to the advance angle release position (8) closer to (7).

  The eccentric rotation cam type advance mechanism (1) has an output wheel (3) with respect to an input wheel (2) and an advance operation state in which the advance input device (4) is positioned at an advance operation position (7). In contrast to the advance angle operation, the advance angle input tool (4) is configured to operate the advance angle release operation in the advance angle release operation state in which the advance angle input tool (4) is positioned at the advance angle release position (8).

  The advance angle operating mechanism (5) includes an advance angle drive spring (9) and an advance angle release temperature sensitive actuator (10). At the time of cold start when the machine temperature is 0 ° C. or less, the temperature-sensing actuator for releasing the advance angle (10) is contracted based on the sensed temperature, and the advance angle input device is driven by the tension of the advance drive spring (9). (4) is positioned at the advance operation position (7). On the other hand, when the engine temperature rises after the start of the cold engine, the advance angle canceling temperature sensitive actuator (10) is in the extended state based on the detected temperature, and the advance angle canceling temperature sensitive actuator (10) is extended. The advance angle input tool (4) is moved to the advance angle release position (8) by the operating force. At the time of warming-up such that the body temperature exceeds 20 ° C, the advance angle canceling temperature sensitive actuator (10) is in the extended state based on the sensed temperature, and the start is performed in the advance angle canceling state. The sensed temperature at which the advance angle releasing temperature-sensitive actuator (10) is in a contracted state and in an extended state may be freely set.

The advance angle operating mechanism (5) includes a reciprocating rotation plate (11) in addition to the advance angle drive spring (9) and the advance angle release temperature sensitive actuator (10).
The reciprocating rotary plate (11) is provided facing the input wheel (2) so as to be reciprocally rotatable about the rotation axis (6) of the input wheel (2). The reciprocating rotary plate (11) is provided with an inclined cam (12) comprising a long hole inclined with respect to the radial direction and the rotational direction. The advance cam (4) of the eccentric rotary cam type advance mechanism (1) is cam-engaged with the inclined cam (12) so as to be driven.

  The advance drive spring (9) is stretched over the input wheel (2) and the reciprocating rotary plate (11), and the inclined cam (12) advances the advance input tool (4). The reciprocating rotary plate (11) is configured to be pressed against the advance angle driving rotation side (13) that is driven to the operation position (7).

  On the other hand, the advance angle canceling temperature sensitive actuator (10) is stretched over the input wheel (2) and the reciprocating rotary plate (11), and in the extended state, the advance angle drive spring ( Against 9), the inclined cam (12) moves the reciprocating rotary plate (11) to the advance angle release rotation side (14) that drives the advance angle input tool (4) to the advance angle release position (8). Configure to operate.

  A cylindrical input shaft (16) is extended from the center of the input wheel (2) toward the reciprocating rotary plate (11). A cylindrical shaft (17) is extended from the center of the reciprocating rotary plate (11) in the same direction as the input shaft (16). The reciprocating rotary plate (11), the cylindrical shaft (17), and the sleeve (41) are externally fitted to the input shaft (16) so as to be reciprocally rotatable.

  The advance angle canceling temperature sensitive actuator (10) comprises a compression coil spring (19) made of a shape memory alloy. The advance driving spring (9) comprises a tension coil spring (20). The compression coil spring (19) and the tension coil spring (20) made of this shape memory alloy are arranged at positions opposite to each other with the rotation axis (6) of the input ring (2) interposed therebetween.

  The proximal end portion and the distal end portion of the compression coil spring (19) made of the shape memory alloy are received by the spring proximal end receiver (22) and the spring distal end receiver (23), respectively. The spring base end receiving tool (22) is positioned with respect to the input wheel (2) by a positioning pin (42) and fixed with a bolt (43). The spring tip support (23) is supported by the pivot pin (44) so as to be swingable with respect to the reciprocating rotary plate (11).

  An elastic rod (24) for preventing buckling of the spring is passed through the compression coil spring (19) made of the shape memory alloy. Of the outer fitting cylinder (25) and the inner fitting rod (26) constituting the telescopic rod (24), the base end portion of the outer fitting cylinder (25) is fixedly fitted to the spring proximal end fitting (22). The internal fitting rod (26) is formed integrally with the spring tip receiving tool (23). The compression coil spring (19) rubs against the outer fitting cylinder (25) during expansion and contraction.

  The present invention is suitable for a diesel engine cold start advance device.

FIG. 1 to FIG. 4 show Embodiment 1 of a cold start start angle device for a diesel engine according to the present invention. FIG. 1 shows an advance operation mechanism 5 of an advance device for a cold start of a diesel engine. FIG. 1A is a longitudinal front view, and is an enlarged view of the IA portion of FIG. 1B is a right side view of FIG. 1A, FIG. 1C is a cross-sectional view taken along the line CC of FIG. 1B, and FIG. 1D is a DD line of FIG. It is line sectional drawing. The longitudinal cross-sectional front view of the transmission device from the fuel injection cam gear of a diesel engine to a fuel injection pump. FIG. 3 shows an advance device for a cold start of a diesel engine. FIG. 3A is a longitudinal front view, the same view as FIG. FIG. 3B is a cross-sectional view taken along the line BB in FIG. 3C is a right side view of FIG. 3A and is the same view as FIG. FIG. 4 shows the operating state of the advance operation mechanism 5 of the advance device at the time of cold start of the diesel engine. FIG. 4 (A) shows a state in which the advance angle is released when the body temperature rises after completion of the cold start, and is the same diagram as FIG. 1 (B). FIG. 4B shows the advance operation state when the engine is cold.

FIGS. 5-7 show a conventional advance angle device for a cold start of a diesel engine. FIG. 5 shows an advance device for a cold start of a diesel engine. FIG. 5A is a longitudinal front view and corresponds to FIG. 5B is a cross-sectional view taken along the line BB in FIG. 5A, and FIG. 5C is a cross-sectional view taken along the line CC in FIG. 5A. FIG. 6 shows the advance angle operation mechanism 5 in FIG. 6A is a cross-sectional view taken along line AA of FIG. 6B, FIG. 6B is a plan view of FIG. 6A, FIG. 6C is a left side view of FIG. FIG. 6D is a cross-sectional view taken along the line DD of FIG. FIG. 7 shows the advance operation state of the advance operation mechanism 5, and is an extraction view of a portion VII in FIG. 6 (A). FIG. 7A shows the advance operation state at the time of cold start. FIG. 7B shows a state in which the advance angle is released when the air temperature rises after the start of the cold machine is completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Eccentric rotation cam type advance angle mechanism, 2 ... Input wheel, 3 ... Output wheel, 4 ... Advance angle input tool, 5 ... Advance angle operation mechanism, 6 ... Rotation axis center, 7 ... Advance angle operation position, 8 ... Advance Angle release position, 9 ... Advance drive spring, 10 ... Advance release temperature sensing actuator, 11 ... Reciprocating rotary plate, 12 ... Inclined cam, 13 ... Advance drive rotation side, 14 ... Advance release release rotation 16: input shaft, 17: cylindrical shaft, 19: compression coil spring made of shape memory alloy, 20: tension coil spring, 22: spring proximal end receiver, 23 ... spring distal end receiver, 24 ... telescopic rod, 25 ... external fitting tube, 26 ... internal fitting rod.

Claims (4)

The output wheel (3) is linked to the input wheel (2) via the eccentric rotation cam type advance mechanism (1),
The advance angle input position (4) of the eccentric rotation cam type advance mechanism (1) is advanced by the advance operation mechanism (5), and the advance operation position on the far side when viewed from the rotation axis (6) of the input wheel (2). (7) can be switched to the advance angle release position (8) closer to the side,
The eccentric rotation cam type advance mechanism (1) has an output wheel (3) for the input wheel (2) in the advance operation state in which the advance input tool (4) is located at the advance operation position (7). In contrast to the advance angle, the advance angle input tool (4) is configured to release the advance angle in the advance angle release operation state in which the advance angle input tool (4) is positioned at the advance angle release position (8).
The advance angle operating mechanism (5) includes an advance angle drive spring (9) and an advance angle release temperature sensor (10). Based on the sensed temperature, it is in a contracted state, and the advance angle input tool (4) is positioned at the advance operation position (7) by the tension of the advance drive spring (9), whereas the body temperature after the start of the cold machine cooler At the time of rising, the advance angle canceling temperature sensing actuator (10) is extended based on the sensed temperature, and the advance angle input tool (4) is advanced by the extension operating force of the advance angle canceling temperature sensing actuator (10). In an advance device for starting a cold engine of a diesel engine configured to be moved to a corner release position (8),
The advance angle operating mechanism (5) includes a reciprocating rotary plate (11) in addition to the advance angle drive spring (9) and the advance angle release temperature sensitive actuator (10).
The reciprocating rotating plate (11) is provided facing the input wheel (2) so as to be reciprocally rotatable about the rotation axis (6) of the input wheel (2). An inclined cam (12) that is inclined with respect to the radial direction and the rotational direction is provided, and the cam is connected to the inclined cam (12) so that the advance angle input device (4) of the eccentric rotation cam type advance mechanism (1) can be driven Combine
The advance drive spring (9) is stretched over the input wheel (2) and the reciprocating rotary plate (11), and the inclined cam (12) advances the advance input tool (4). The reciprocating rotary plate (11) is configured to be pressed against the advance drive rotation (13) side that is driven to the operation position (7).
On the other hand, the advance angle canceling temperature sensitive actuator (10) is stretched over the input wheel (2) and the reciprocating rotary plate (11), and in the extended state, the advance angle driving spring. Against (9), the inclined cam (12) reciprocates the rotating plate (11) toward the advance angle release rotation (14) side that drives the advance angle input tool (4) to the advance angle release position (8). A diesel engine cold start advance device characterized in that it is configured to operate. In the diesel engine cold start advance device of claim 1,
An input shaft (16) is extended from the center of the input wheel (2) toward the reciprocating rotary plate (11), and a cylindrical shaft (17) is extended from the central portion of the reciprocating rotary plate (11) to the input shaft (16 When the diesel engine is cold started, the reciprocating rotary plate (11) and the cylindrical shaft (17) are externally fitted to the input shaft (16) so as to be reciprocally rotatable. Advancement device. The diesel engine cold start advance device according to claim 1 or 2,
The advance angle canceling temperature sensitive actuator (10) comprises a compression coil spring (19) made of shape memory alloy, and the advance angle drive spring (9) comprises a tension coil spring (20),
The compression coil spring (19) and the tension coil spring (20) made of the shape memory alloy are disposed at positions opposite to each other with the rotation axis (6) of the input wheel (2) interposed therebetween. A diesel engine cold start advance device. In the diesel engine cold start advancement device according to claim 3,
The proximal end and the distal end of the compression spring (19) made of the shape memory alloy are received by the spring proximal receptacle (22) and the spring distal receptacle (23), respectively, and the spring proximal receptacle (22) is input. The spring tip support (23) is supported on the reciprocating rotary plate (11) so as to be swingable.
An elastic rod (24) for preventing buckling of the spring is passed through the compression coil spring (19) made of the shape memory alloy, and an external fitting cylinder (25) and an internal fitting rod (26) constituting the elastic rod (24). ), One of which is fixed to the spring base bracket (22) and the other is fixed to the spring tip bracket (23). Advancement device.

Images