CN1060843C - Auxiliary starting device - Google Patents

Abstract

The starting fuel supply main body 10 is composed of a starting fuel supply valve 11, a jumping mechanism 12, and a valve driving part 13. Under the small opening degree of the starting fuel supply valve 11 that is about to completely close the starting fuel supply passage 3, the claw of the jumping arm 20 24 engages with the annular groove 15 to temporarily stop the starter supply valve 11 from moving. Thereafter, the bracket sleeve 32 constituting the valve driving part 13 descends, and the top end 27 of the jumping arm 20 is pushed by its bottom 33, and the engagement of the claw 24 and the annular groove 15 is released, so that the starting fuel supply valve 11 descends rapidly, and the The starter oil supply channel 3 is quickly and completely closed. Therefore, the engine rotation immediately before the valve is fully closed can be stabilized.

Description

Auxiliary starting device

The present invention relates to a starting aid (pista) device installed in a carburetor of a motorcycle or the like for supplying fuel when starting.

Such an auxiliary starting device is, for example, disclosed in Japanese Patent Publication No. Sho 63-41549, and becomes a known technology. This device includes a starting oil supply valve and a wax element (ワックスェレメント), which is used to open and close the starting oil supply passage of the carburetor. The plug is used to move the primer supply valve.

When the engine is started, the wax sealed in the wax element is heated, and its thermal expansion makes the plunger stretch, thereby moving the starting oil supply valve (   ), slowly closing the starting oil supply passage, and changing the air-fuel ratio during warm-up operation into the best condition.

Japanese Patent Publication No. 61-185660 discloses such a device. The piston of the wax assembly is composed of a section with a large sliding resistance and a section with a small sliding resistance. By changing the moving speed of the plunger, the starting supply can be adjusted. The opening of the oil valve is such that the opening of the starting oil supply valve will not be too large and the air-fuel ratio will not be too rich when the engine is stopped because the wax cools earlier than the engine.

As known technology, there is also such a device, for the same purpose, a thermal cap or a heating block (ヒ-トマス) is set in the wax element to delay the cooling of the wax.

Japanese Patent Publication No. 63-23560 discloses such a device, which usually sets a cam between the plunger and the starting oil supply valve, so that the advancing and retreating direction of the plunger is perpendicular to the moving direction of the starting oil supply valve, so that the device The whole is miniaturized, and at the same time, the stroke of the starting oil supply valve is changed non-linearly.

Fig. 5 shows the temperature rise characteristics of the air-fuel ratio, air volume, and wax temperature corresponding to the elapsed time after the engine is started when the engine is started in a cold state. The horizontal axis represents the past time, and the vertical axis represents the air-fuel ratio (5A), The characteristics of air volume (5B) and wax temperature (5C) supplied to the carburetor for suction.

Fig. 6 shows the cooling characteristics of the above-mentioned characteristics after the engine is stopped, the horizontal axis is the elapsed time after the engine is stopped, and the vertical axis is the air-fuel ratio (6A), air volume (6B), and wax temperature (6C). This figure is used to investigate the action of the starting oil supply valve when the engine is restarted when the engine temperature is still relatively high (hereinafter referred to as hot restart).

Figure 7 shows the corresponding relationship between the stroke change of the starting fuel supply valve and the wax temperature change in Figures 5 and 6. A positive value is represented.

The symbols in Figure 7 correspond to those on Figures 5C and 6C. The characteristics shown by the dotted lines in Figures 5 to 7 are the characteristics of the existing auxiliary starting device. The structure of the auxiliary starting device is suitable for both cold starting and hot restarting. For hot restarting, a thermal insulation cap described later is provided. . The thick solid lines in these figures show the characteristics of the present invention described later.

As shown in Figure 7, there is an unstable region before the starter fuel supply valve is fully closed. In this unstable region, when the engine vibration or intake pulsation causes the starter fuel supply valve to vibrate at a small opening when it is closed, since the opening is small, the opening area variation ratio is large, and the engine speed becomes unstable. Stable, prone to engine stop or sharp drop in output, etc.

Therefore, in order to avoid the influence of the unstable region, it is necessary to warm up the engine for enough time to make the temperature at the fully closed state (hereinafter referred to as the fully closed temperature) high enough, and at the same time, it must pass through the unstable region as quickly as possible to enter the fully closed state.

Therefore, the existing set stroke ST1 must be long enough, and this alone makes the warm-up time too long. That is, the warm-up time corresponding to the current necessary full-close temperature d shown at point X is known as T4 from the wax temperature rising curve shown by the solid line in FIG. 5C. Since this time is relatively long, it is desirable to shorten it. Among them, C is the temperature entering the unstable region, and T3 is the warm-up time at this time.

The air-fuel ratio (A/F) and air volume (Gair) corresponding to the existing warm-up time are shown in Figure 5A and Figure 5B respectively, especially as shown in Figure 5B, a longer warm-up time will lead to unstable There is too much air in the vicinity of the region, creating an oversupplied region where the engine rotation tends to become unnecessarily large. Wherein, the vertical axis of FIG. 5B and FIG. 6B is the space air volume (gram, g) per unit time (second, S).

However, for the purpose of shortening the overall warm-up time, if a short set stroke ST2 as shown by the solid line in Fig. 7 is assumed, the air-fuel ratio at this time The amount of air passes through the unstable region in a state where the warm-up is insufficient, as shown in FIGS. 5A and 5B by dashed-two dotted lines as a comparative example.

therefore. When starting in a cold state, it is hoped to shorten the set stroke to shorten the entire warm-up time, increase the fully closed temperature as much as possible, and pass through the unstable area as quickly as possible, and at the same time prevent the action from causing excess air.

On the other hand, when starting in a hot state, the wax is cooled earlier than the engine, so the opening exceeds the opening of the starting oil supply valve suitable for the engine temperature (that is, it is opened too early), and as a result, the fuel will become It is too rich, and it is shown by a two-dot chain line as a comparative example in Fig. 6A, 6B.

In order to delay the cooling of the wax, as shown in the dotted lines in Fig. 6A and 6B, in the prior art examples, a thermal insulation cap or a heating block is set in the wax element to obtain a valve opening suitable for the engine temperature.

However, once such a thermal cap or a heating block is provided, the auxiliary starting device becomes large and heavy, and therefore, it is desirable to omit it to miniaturize the device.

The above-mentioned Japanese Patent Publication No. Sho 63-41549 has no description on such a problem. Japanese Patent Publication No. 63-23560 transmits the movement of the plunger to the starting fuel supply valve at a ratio of 1:1 or a prescribed ratio through a cam member. In the latter case, although the opening degree of the starting oil supply valve changes non-linearly, it is only a non-linear change, and the above requirements cannot be realized.

The purpose of the Japanese Patent Publication No. Sho 61-185660 is to change the expansion and contraction speed of the plunger to slowly open the starting oil supply valve after the engine stops. It can be considered that even if the insulation cap and heating block are omitted, it is suitable for restarting in a hot state , but does not eliminate the unstable regions of the engine during cold starts.

The present invention is made to solve the above problems. The purpose of the present invention is to provide a small-sized auxiliary starting device that can stabilize the engine rotation near the small opening of the fuel supply valve and provide sufficient warm-up time. .

The auxiliary starting device of the first invention is installed on the carburetor, and it has a starting oil supply valve and a wax element. The starting oil supply valve is used to open and close the starting oil supply channel leading to the carburetor and adjust its opening degree , the wax element is used to move the starting oil supply valve; it is characterized in that: there is a jumping mechanism (skip mechanism), and the jumping mechanism is used to temporarily stop the starting oil supply valve at a small opening degree before the starting oil supply channel is about to be fully closed Move or move slowly, and then make it move quickly to enter the fully closed state, so that the stroke of the starting fuel supply valve changes in steps.

The so-called slow movement refers to the state in which the starting oil supply valve is slidably connected with the jump mechanism, so that the sliding resistance temporarily increases, thereby slowing down the moving speed of the starting oil supply valve.

In addition, the so-called stroke of the starting oil supply valve changes in a step shape, which means that the characteristics related to the wax temperature and the stroke of the starting oil supply valve shown in Fig. When the fully closed temperature (b in FIG. 7 ) is higher than the temperature (c in FIG. 7 ), the fully closed position is rapidly moved to the fully closed position at this temperature, so that the bending point is more than 3 points.

The 2nd invention is the device like the 1st invention, It is characterized in that: The skipping mechanism has a skipping link (skipsonke), and this skipping link is supported by the immovable part, and is temporarily engaged with the starting oil supply valve under the above-mentioned small opening degree. , and thereafter disengaged by movement of the telescoping member of the wax element or the priming valve itself.

Here, the telescopic member of the wax element includes the plunger itself of the wax element or a member other than the plunger but pushed by the plunger to move integrally.

The third invention is the device of the first invention, characterized in that the jumping mechanism has a jumping member, the jumping member is supported by the immovable part, and is temporarily engaged with the starting oil supply valve under the above-mentioned small opening degree, and passes through a predetermined temperature. The deformation below will disengage the joint.

Such a jumping member may be formed of an appropriate material such as a bimetal or a shape memory alloy.

The accompanying drawings are briefly described below.

Figure 1 is a full sectional view of the auxiliary starting device.

Fig. 2 is a full sectional view of important parts of the auxiliary starting device.

Figure 3 is the same as above.

Fig. 4 is a cross-sectional view along line 4-4 in Fig. 2 .

Fig. 5 is a graph showing temperature rise characteristics.

Fig. 6 is a graph showing cooling characteristics.

Fig. 7 is a graph showing changes in the stroke of the starting fuel supply valve.

FIG. 8 is a diagram showing changes in the starting fuel supply valve.

Figure 9 is the same as above.

Figure 10 is the same as above.

The auxiliary starting device provided in the motorcycle carburetor is described below according to the accompanying drawings.

Figure 1 is the overall cross-sectional structure of the auxiliary starting device, Figure 2 is an enlarged view of the part near the starting fuel supply valve, Figure 3 is a view from the direction indicated by the Z arrow in Figure 2, and Figure 4 is a view along the line 4- in Figure 2 Sectional view represented by 4 lines.

In these figures, the starting aid has a base 1 attached to a carburetor (not shown in the drawings) and a main body 10 for detachably attaching to the base 1 .

The base 1 has a concave portion 2 and a starting oil supply channel 3, the concave portion 2 is used to cooperate with the starting oil supply main body portion 10, and the starting oil supply channel 3 leads to the main chamber throttle formed in the carburetor (not shown in the figure ) on the downstream side.

The starting oil supply channel 3 communicates with the starting oil supply air channel 4 through the valve chamber 5. The starting oil supply air channel 4 leads to the upstream side of the carburetor throttle, and the opening 6 facing the valve chamber 5 can be started by moving. Oil supply valve 11 to open and close.

Adjacent to the valve chamber 5 is a starting fuel supply needle valve regulating nozzle (Bista-Ni-Drujet) 8, which is set at the fuel supply leading to the float chamber (Frot-to chamber) (not shown in the figure). Exit of channel 7.

The priming main body part 10 has a priming valve 11 , a jump mechanism 12 and a valve driving part 13 .

The starting oil supply valve 11 is generally cylindrical, and can open and close the starting oil supply channel 3 and adjust the opening by advancing and retreating in a direction perpendicular to the starting oil supply channel 3 .

In the central part of the lower part of the starting oil supply valve 11, the needle 14 protrudes toward the axial direction, advances and retreats in the adjusting nozzle 8 of the starting oil supply needle valve, and adjusts the fuel.

On the outer peripheral surface of the starting fuel supply valve 11, an annular groove 15 is formed all around, and its cross-sectional shape is such that the upper part 16 is a right angle shape, and the lower part 17 is a slope shape (referring to Fig. 2 ). The pawl 24 can be engaged with or disengaged from the annular groove 15 .

A flange portion 18 protruding inwardly at a right angle is formed on the upper end portion of the primer valve 11 ( FIG. 2 ).

The jump mechanism 12 has a jump link 20 having an arm portion 22 , a fulcrum portion 23 , a claw portion 24 , and a tail portion 25 , and a link spring 21 .

One end of the link spring 21 fits in the groove 26 (FIG. 3) formed in the tail part 25, and the other end leans against the immovable part on one side of the base 1, so as to align the jump link clockwise in FIGS. 1 and 2. 20 Apply spring force.

The details of the jump link 20 are shown in FIGS. 2-4 . Wherein, the upper part of Fig. 4 shows the state that the jumping link 20 resists the link spring 21 to make the arm part 22 turn to the substantially horizontal direction, and the lower part shows the state where the link spring 21 makes the arm part 22 turn to the up-down direction substantially. state.

As can be seen from these figures, the arm portions 22 are a pair of arm-shaped portions that sandwich the starter fuel valve 11 and extend along the left and right outer peripheries.

The fulcrum portion 23 protrudes outward from the middle portion of each arm portion 22 , fits and supports in the support recessed portion 2 a formed on the base 1 , and becomes the rotation center of the jump link 20 .

The tail portion 25 is connected to the bottom of the left and right arms 22 , protrudes downward, and is freely rotatably accommodated in the tail portion accommodating recess 9 communicating with the recess 2 .

The claw 24 protrudes from the inner side of the tail portion 25 , and when located at a position capable of engaging with the annular groove 15 , it can be engaged with or disengaged from the annular groove 15 as the tail portion 25 rotates downward.

It can be seen from Fig. 1 that the valve driving part 13 has a cylindrical housing 30, a bracket sleeve 32, a wax element 35, and one end of the cylindrical housing 30 fits in the recess 2, and the bracket sleeve 30 is cylindrical with a bottom. And it can be housed inside the housing 30 to move up and down against the main body return spring 31 , and the wax element 35 has a plunger 34 that contacts the bottom 33 of the bracket sleeve 30 at one end. The bracket sleeve 32 and the plunger 34 constitute a telescopic member.

Inside the wax element 35 omitting the thermal cap in the prior art, the thermosensitive wax 37 and the semi-fluid 38 are sealed by the elastic film 36, and the thermistor 35a of the wax element 35 is energized by the wire 39, and the corresponding engine temperature rises. Heating can make the temperature-sensitive wax 37 thermally expand.

When the temperature-sensitive wax 37 thermally expands, the plunger 34 is pushed out by the elastic membrane 36 , the semi-fluid 38 and the piston 35b, and the bracket sleeve 32 is pushed down against the main body return spring 31 .

A hollow protrusion 40 protruding downward from the central portion is formed at the bottom 33 of the bracket sleeve 32 , and a flange 41 is formed outward at the lower end of the protrusion 40 .

The protruding part 40 is inserted into the hollow part of the flange part 41 and can move relative to the starting fuel supply valve 11, and the flange parts 18, 41 can prevent the two from being disengaged.

A valve spring 42 (Fig. 1) is installed between the starting oil supply valve 11 and the protrusion 40, and is used to push the starting oil supply valve 11 along the direction protruding from the protrusion 40 so that the flange part 18 is in contact with the protrusion. The edge 41 is engaged.

Next, the operation of the jump mechanism will be described with reference to FIGS. 5-10 . First, as shown by the wax temperature rising curve of the solid line in Fig. 5C, after starting from a cold state (A), it becomes a normal operation after a warm-up operation (D-F), and the ambient temperature of the engine during this period varies with It rises with the passage of time after starting.

As the warm-up time elapses, the air-fuel ratio gradually increases after startup as shown in FIG. 5A , and the air-fuel mixture concentration gradually becomes leaner.

The change in the air amount shown in FIG. 5B is also the same as the change in the air-fuel ratio, and the air amount gradually decreases. This air volume is smaller than the supply volume in the dotted line characteristic which tends to be oversupplied in the oversupply region.

In Fig. 7, when the starting fuel supply valve is close to the unstable region and reaches the jump starting point D, the stroke from temperature a to c is constant.

The temperature c is the temperature when the prior art example (dotted line) enters the unstable region, and it crosses the fully closed position from the same jump end point F to reach the G point, which greatly exceeds the stroke amount.

This point G coincides with the point corresponding to temperature c when it is extended from point D without jumping, and a point between points DF corresponding to the fully closed temperature b when the extended line of point D is at the fully closed position Point E shown in the figure.

After the engine stops, as the temperature of the wax decreases, the valve stroke returns in a straight line from point G to point D without jumping.

When the starter fuel valve is fully closed, the amount of overtravel beyond the fully closed position to reach the overtravel position OS is a predetermined stroke amount ST0. Points H·I are different temperature points at the over-moving position OS.

In this way, when entering the unstable region, the valve stroke jumps in steps of points D·E·F·G, passes through the unstable region in the shortest time between points FG, and the starting fuel supply valve is quickly fully closed.

At this time, the air-fuel ratio changes in a stepwise manner at points P·Q·R in FIG. 5A . Point R is the air-fuel ratio at idling speed after the starting fuel supply valve is fully closed, and it becomes the air-fuel ratio at this idling state after it is fully closed.

Even compared with the conventional example (dotted line), the air-fuel mixture concentration is equal between points PQ, and the warm-up time T3 is substantially equal to T4 in the conventional example.

That is, it is possible to secure the same characteristics of the air-fuel ratio and time required for warming up as those of the prior art example.

The change in the air amount shown in Fig. 5B also changes in a p·q·r step like the air-fuel ratio. Through this change, compared with the conventional example (dotted line), it is possible to avoid the oversupply region and make the air The amount is appropriate to suppress unnecessary engine rev rise.

In addition, it is also possible to maintain a larger amount of air than that of the comparative example (two-dashed line) so that the rotation of the engine does not become unstable. After fully closed, it becomes the air volume at idle speed.

As shown by the encircled portion in FIG. 5B , the characteristics at the time of jumping can be changed by the shape of the annular groove 15 .

That is, when the upper part 16 of the cross-sectional shape of the annular groove 15 is at right angles, that is, as shown by M, it is the same as the above-mentioned case, and the characteristic is a step shape changing at right angles at points p·q·r.

On the other hand, for the situation that the cross-sectional shape of the upper part shown by N is the inclined surface 19, the points p and q1 shown by the thick dashed line p·q1·r are generally stepped with some inclination, and the inclination can pass through the slope of the inclined surface 19. The tilt can be set arbitrarily.

In the case of N, when the claw 24 is rotated counterclockwise in the figure when the claw 24 enters the annular groove 15, the contact point between the claw 24 and the inclined surface 19 will deviate and slowly move downward. The oil supply valve 11 is disengaged while being activated. Therefore, this situation corresponds to the form of disengagement by the movement of the starter fuel supply valve 11 itself.

In the invention of the present application, although the pawl 24 enters the annular groove 15 and contacts the slope 19 as in N to allow the movement of the starter fuel supply valve 11, the state of making the movement slow is also included in the engagement.

When restarting in a hot state, the cooling characteristics are shown in Figure 6. The dotted line in the figure is the prior art example with heat-insulating cap, and the two-dot dash line is the comparative example in which the heat-insulating cap is removed from the prior art example. The thick solid line is characteristic of the invention of the present application, and corresponds to a case where the set stroke is shorter than that of the comparative example.

That is, in the comparative example with a long set stroke, the time to cool down to the point X of temperature d in Fig. 7 is T5, as shown in Fig. 6A·6B, which is similar to the conventional example (dotted line) suitable for hot restart In contrast, the priming valve opens very early, and as a result, the mixture becomes too rich.

On the other hand, according to the present invention, since the set stroke is set to be short, at point J corresponding to T6 which is longer than T5, the temperature b finally reaches the fully closed position, and the starter fuel supply valve starts to open.

It can also be seen from Fig. 6A·6B that the position (time) of point J is similar to the time when the starting oil supply valve starts to open in the prior art example (dotted line), even at a later position than the prior art example. Therefore, even without the thermal cap and heating block (ヒ一トマス) in the prior art, it is possible to open the priming fuel supply valve to the same extent as the prior art or even slower than it, thereby avoiding the state where the air-fuel ratio is too rich .

8 to 10 show the operation state of the starter fuel supply valve for exerting the above-mentioned characteristics, and the symbols A to K assigned to the operation correspond to the respective stages A to K shown in FIGS. 5 to 7 .

First, when fully open (A), the claw 24 of the jumping link 20 is in a non-engaged state with the annular groove 15, and the starting fuel supply valve 11 can move freely downward relative to the jumping link 20.

When the temperature-sensitive wax is heated and the plunger 34 begins to extend downward, the plunger 34 begins to push the bottom 33 of the bracket sleeve 32 to move downward (B).

At this stage, the valve spring 42 engages the flange portion 41 of the protrusion 40 with the flange portion 18 of the priming fuel supply valve 11, and the priming fuel supply valve 11 moves downward integrally with the protrusion 40 to turn the priming fuel supply The opening portion 6 of the oil passage 3 is reduced to W1(C). This W1 is slightly larger than the micro opening W that enters the unstable region.

Before long, when the opening degree of the opening 6 of the starting oil supply passage 3 reaches a small opening degree W that becomes an unstable region (point D in FIG. 7 ), the annular groove 15 of the starting oil supply valve 11 and the jumping link 20 The claws 24 are at the same height, and the claws 24 are engaged with the annular groove 15 to prevent the starter fuel supply valve 11 from moving downward (D).

At this stage, since there is a slight gap S between the top 27 of the arm portion 22 and the bottom 33 of the bracket sleeve 32, the bracket sleeve 32 can continue to descend although the starting oil supply valve 11 stops.

Since the small gap S determines the jumping range (between points DF in FIG. 7 ), the jumping range can be adjusted arbitrarily by changing the small gap S appropriately.

From this D stage to the E stage in FIG. .

Soon, the bottom of the bottom 33 is close to the top 27 (E) of the arm 22. When the contact occurs, the arm 22 will turn counterclockwise in the figure against the link spring 21, and the claw 24 will be released from the annular groove 15. open (F).

In this way, the starting oil supply valve 11 moves downward quickly under the pressure of the valve spring 42 until the flange 18 engages with the flange 41 and stops, so that the starting oil supply passage 3 is in a fully closed state (G).

When the plunger 34 continues to extend, the starting oil supply valve 11 moves too much and descends integrally with the protrusion 40, and its bottom contacts the upper end of the starting oil supply needle valve regulating nozzle 8, thereby stopping the movement (H). The amount of movement of the starter valve 11 from the fully closed position to this state is the overtravel amount ST0.

Thereafter, the starting oil supply valve 11 stops moving downward, and the plunger 34 stretches proportionally with the rise of the wax temperature, so only the protrusion 40 descends in the starting oil supply valve 11 (refer to I in FIG. 10 ). .

FIG. 10 shows the state of the starter fuel supply valve 11 corresponding to I·J·K in FIG. 6C , and in the I stage immediately after the engine stops, it is in the overmoving state as described above.

Thereafter, as the wax cools, the plunger 34 rises integrally with the starting oil supply valve 11, and the annular groove 15 approaches the claw 24 (J) in the fully closed position, and the starting oil supply passage 3 is opened soon, and the claw 24 Engages with the annular groove 15 (D).

However, since the lower part of the annular groove 15 is the inclined portion 17, when the protruding portion 40 and the starting oil supply valve 11 continue to rise integrally, the claw 24 slides over the inclined portion 17 and escapes from the annular groove 15, allowing the starting oil supply The oil valve 11 moves upward, and further returns to the set stroke from the fully open position. K indicates the fully open position.

Therefore, the change of the valve stroke during this period is carried out in a straight line like G·J·D·K in Figure 7, and there is no step-like change (G·F·D) caused by jumps.

The present invention is not limited to the above configurations, but various modifications are possible. For example, the jumping mechanism may use a jumping member deformed at a certain temperature such as a shape memory alloy or a bimetal, which engages or disengages the starter fuel supply valve at a predetermined temperature corresponding to the aforementioned small opening.

According to the first invention, a jumping mechanism is provided, which temporarily stops or moves the starting oil supply valve at a small opening, so that the stroke of the starting oil supply valve changes in steps, so that the starting oil supply valve can be skipped. The unstable region just before the oil valve closes.

Therefore, even if the set stroke is short, there is no danger of the engine stopping or a sharp drop in output when passing through an unstable region, and the engine speed will not rise unnecessarily due to excessive air supply. Therefore, it is possible to stabilize the rotation of the engine in the vicinity of a small opening, and to provide a sufficient warm-up time.

In addition, since the setting stroke of the starting fuel supply valve is short, even at the same temperature, it is closed to a greater degree than that of the prior art example, so that the opening of the starting fuel supply valve after the engine stops can be delayed, even if no heat preservation cap is set in the wax element. Or a heating block is also available.

Therefore, it can be closed slowly in the case of cold start, on the contrary, it can be delayed in the case of hot restart, so that both cold start and hot start can be realized, and the insulation cap and heating block can be omitted. The auxiliary starting device is miniaturized.

According to the second invention, the jumping mechanism has a jumping link, and the jumping link is supported on the immovable part, and is temporarily engaged with the starting oil supply valve with a small opening to stop or move slowly, and then the telescopic member of the wax element Or start the movement of the oil supply valve itself to disengage, so a jump mechanism with a relatively simple structure and reliable operation can be obtained.

According to the third invention, the jumping mechanism adopts a jumping member, and the jumping member is supported on the non-moving part, and is temporarily engaged with the starting fuel supply valve at the above-mentioned small opening, and is released by deformation at a predetermined temperature, so that the jumping can be simplified. mechanism.

Claims (2)

1. an auxiliary starting device is installed on Carburetor, and it has starting delivery valve and wax element, and this starting delivery valve is used to open and close the starting oil supply gallery that leads to Carburetor and its aperture is regulated, and the wax element is used for moving and starts delivery valve; It is characterized in that, be provided with hopping mechanism, make the starting delivery valve temporarily stop to move or slowly moving under the aperture on starting oil supply gallery little before being about to full cut-off, make its fast moving then and enter full-shut position, make the stroke of starting delivery valve be step-like variation thus, this hopping mechanism has the jump connecting rod, this jump link supporting is in motionless portion, with the starting delivery valve temporary joint under the above-mentioned small aperture, and remove by the telescoping member of wax element or moving of starting fuel tap self after this and to engage.

2. an auxiliary starting device is installed on Carburetor, and it has starting delivery valve and wax element, and this starting delivery valve is used to open and close the starting oil supply gallery that leads to Carburetor and its aperture is regulated, and the wax element is used for moving and starts delivery valve; It is characterized in that: be provided with hopping mechanism, make the starting delivery valve temporarily stop to move or slowly moving under the aperture on starting oil supply gallery little before being about to full cut-off, make its fast moving then and enter full-shut position, make the stroke of starting delivery valve be step-like variation thus, this hopping mechanism has the jump member, this jump member supporting is in motionless portion, with the starting delivery valve temporary joint under the above-mentioned small aperture, and will engage releasing by the distortion under the set point of temperature.

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