JP2811544B2 - Fuel cut actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic operation device for an engine applied to start and stop operations of a diesel engine, and to open and close a fuel cutoff valve provided in a fuel supply pipe of the diesel engine. The present invention relates to a fuel cut actuator used for a fuel cell.

[0002]

2. Description of the Related Art A fuel cut actuator S is
As shown in FIG. 14, the fuel cutoff valve B provided in the fuel supply pipe P of the diesel engine E is opened and closed. When the diesel engine E is stopped, the cable K is operated by the fuel cut actuator S. , The fuel cut-off valve B is closed. On the other hand, when the diesel engine E is started, the fuel cut-off actuator S pushes the cable K to open the fuel cut-off valve B.

FIG. 9 shows one of the conventional examples, in which a speed reducer 101 is assembled to a motor M, and a crank 103 is fixed to an output shaft 102 of the speed reducer 101.
03 and spring 104, and spring 1
04 and a cable 105. This cable 105 is tube 1 so as not to be exposed.
As shown in FIG. 9, the crank 103 rotates by the motor drive, and the cable 105 connected to the crank 103 slides in the tube 106 as shown in FIG. 9.

However, in the conventional example shown in FIG. 9, since the crank 103 rotates to slide the cable 105 via the spring 104, the cable 105 is fixed despite the outside of the cable 105 being fixed. It slides within the tube 106 itself. For this reason, cable 1
05 is not a linear direction, so the cable 10
5 and the tube 106 are rubbed,
5 is damaged.

As shown in FIG. 10, there is also known a technique in which a cable 105 reciprocates in a linear direction by reciprocating a slide plate 110 by driving a motor M. That is, the motor M and the speed reduction unit 111 are provided, and a worm (not shown) is formed on the output shaft of the motor M. The worm meshes with a worm wheel 113 supported by a gear shaft 112 in the gear case of the reduction unit 111.
An output bolt 114 is screwed and fixed to the upper surface of the drawing 13 in the drawing.

A long slide plate 110 is provided between the open end of the gear case and a cover 115 that closes the gear case so as to reciprocate in the left-right direction above the gear shaft 112. This slide plate 110
A concave guide 116 for slidably fitting an output bolt 114 on the worm wheel 113 side is fixed on the lower surface of the drawing in a state orthogonal to the slide plate 110, whereby the slide plate 110 Is reciprocated in a linear direction following the rotational motion of the motor. Reference numeral 117 denotes a coil spring for stroke correction, and reference numeral 118 denotes a connecting member.

In the conventional fuel cut actuator S shown in FIG. 10, damage to the cable 105 is reduced. However, since the sliding parts such as the connecting member 118 at the end of the slide plate 110 connected to the cable 105 and the coil spring 117 for stroke correction are exposed outside, the fuel cut actuator is directly exposed to water and mud. Since there is no possibility that the transmission of the output of S will be hindered, it is necessary to cover all of them with case 119 (indicated by a virtual line).

[0008] For this reason, when the whole cable is enlarged and the cable is damaged, the connecting portion between the cable and the actuator is covered by the case, so that only the cable cannot be replaced, and the entire actuator must be replaced. was there.

In the technique shown in FIG. 10, since the output shaft is fixed to the rotating portion (disk portion) of the worm wheel 113, it is difficult to waterproof because it is hard to waterproof, and it is necessary to make a unit. Therefore, there is a problem that the whole becomes large and the cost becomes high, and solving this has been a problem.

[0010] In order to solve the problem of the enlargement as described above, techniques as shown in FIGS. 11 to 13 have been proposed. This technology uses an output case that is supported by an actuator case 120 (upper case 120a, lower case 120b) and a guide portion 121 that is linearly provided inside the actuator case 120 so as to reciprocate along the linear direction. The actuator case 120 is provided with a casing fixing portion 125 for fitting a casing 124 of a cable 123 with a tubular casing connected to a fuel cutoff valve of a diesel engine. The output slide block 122 includes: This is provided with a cable locking portion 126 for locking a distal end locking portion of a cable protruding from an end of the casing 124 (see Japanese Utility Model Laid-Open No. 5-84162). In FIG. 11,
Reference numeral 127 denotes a spring, reference numeral 128 denotes a pin groove, and reference numeral 129 denotes a connecting pin.

[0011]

However, in the technique shown in FIGS. 11 to 13, the guide portion 121 and the output slide block 122 are provided, and the cable 123 is reciprocated in a linear direction, and the upper case 120a is connected to the lower case 120a. Although the entire body is covered with the case 120b, the size can be reduced. However, if the cable 123 is damaged, the case 120 (the upper case 120a and the lower case
Since the whole is covered by 0b), only the cable 123 cannot be replaced, and the problem that the entire actuator must be replaced has not been solved.

In general, the functions required of the fuel-cut actuator include a configuration in which the cable is not damaged by driving the motor, and a configuration in which the sliding portion of the cable is not directly exposed to water or mud. To do,
If only the cable is damaged, only the cable can be replaced with a structure that allows easy connection and disconnection of the cable.
It is desirable to satisfy all elements. However, in the prior art, miniaturization and the like were performed at the expense of any one of these three elements.

[0013] In spite of the desire to share and reuse parts, particularly in terms of cost reduction and environmental considerations, conventional fuel cut actuators require a motor,
A unit is integrated by incorporating a connecting member, a rotating member, and the like, and the degree of freedom is restricted.

In the fuel cut actuator, since the output shaft and the rotating portion of the reduction portion are fixed, waterproofing is difficult, and the fuel cut actuator has to be formed into a unit which is hardly exposed to the outside. For this reason, there has been a problem that the cable and the connecting member cannot be replaced or that the actuator case needs to be replaced after being removed. Also, the pulling length of the cable cannot be changed between the rotating member and the cable, or the actuator case needs to be removed and replaced according to the pulling strength.

An object of the present invention is to provide a fuel cut actuator which satisfies all of the three elements without sacrificing any of the three elements as in the prior art. Another object of the present invention is to
It is an object of the present invention to provide a fuel cut actuator which can easily replace a cable, can adjust the tensile strength of the cable, can share and reuse parts, is versatile, and is suitable for cost reduction and environment.

[0016]

According to a first aspect of the present invention, there is provided a fuel cut actuator comprising a bracket, a motor having a speed reduction portion having an output shaft exposed to the outside, and a rotating member mounted on the output shaft of the speed reduction portion. An elastic member having one end attached to an end of the rotating member, a connecting member provided at the other end of the elastic member, a cable connected to the connecting member, and an actuator case; The motor and the actuator case are assembled, the elastic member is reciprocally moved linearly by the rotation of the rotating member, the cable is reciprocated linearly moved, the connecting member is a connecting portion with the elastic member and the The actuator case has a guide portion for the connection member, and the guide portion guides the connection member. Characterized by comprising covering the elastic member causes sliding Te.

The speed reducer includes a worm formed on a motor output shaft, and a worm wheel gear meshing with the worm. It is preferable that the rotating member be configured to rotate.

Further, it is more preferable that the actuator case is configured so as not to cover the rotating member and not to cover a connecting portion of the connecting member to the cable.

[0019]

The fuel cut actuator of the present invention
Since the actuator case has a guide portion of the connecting member and guides and slides the connecting member to the guide portion, the cable performs a linear sliding motion, so that the cable is damaged by the driving of the motor. Can be configured not to receive. Further, since the actuator case covers the connecting member and the elastic member, it is possible to prevent the sliding portion of the cable from being directly exposed to water or mud.

Further, since the connecting member has a connecting portion with the elastic member and a connecting portion with the cable, if only the cable is damaged, it is possible to make the structure easy to attach and detach the cable. Can be easily replaced.
As described above, since the output shaft is exposed to the outside, and the connecting member has a connecting portion with the elastic member and a connecting portion with the cable, the assembling operation can be performed from outside the fuel cut actuator. Yes, cable replacement is easy.

As described above, in the present invention, the actuator case has the guide portion of the connecting member, guides the connecting member to slide on the guide portion, and covers the elastic member. The cover can be a minimum necessary portion, and versatility can be enhanced.

[0022]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 6 show an embodiment of a fuel cut actuator according to the present invention.
2 is a plan view of the fuel cut actuator, FIG. 2 is a side view of the fuel cut actuator, FIG. 3 is a plan view of the cover member, FIG. 4 is a view as seen from the arrow AA in FIG. 3, and FIG. FIG. 6 is an exploded perspective view of the fuel cut actuator.

The fuel cut actuator S according to the present embodiment includes a bracket 10, a speed reduction unit 20, a motor M
, Rotating member 30, elastic member 40, connecting member 50
, The cable 60, and the actuator case 70 as main components.

The bracket 10 of this embodiment is for fixing the cable 60 and attaching it to the vehicle. As shown in FIG. 6, a cable fixing plate 11 is provided at one end. An opening 12 for exposing the output shaft 21 of the reduction section 20 is formed on the side opposite to the opening.

Engaging portions 13 and 14 for attachment to the vehicle body are formed at predetermined height positions.
4 has screw holes 13a and 14a. Further, connection screw holes 15a, 15b, and 15c with the deceleration portion 20;
Mounting screw holes 16a, 16 of actuator case 70
b and 16c are respectively formed at predetermined positions.

The motor M of this embodiment is a drive source,
It is assembled integrally with 0. That is, a worm is formed on the output shaft (not shown) of the motor M, and the worm and the worm wheel gear mesh with each other. The center shaft of the worm wheel gear is configured as the output shaft 21. The distal end side of the output shaft 21 of this example is a screw 22.

The worm, the worm wheel, the bearing of the output shaft 21 and the like are accommodated in a casing 23 of the speed reducer 20. At a predetermined position of the casing 23, a screw hole 24 which is aligned with the connection screw holes 15a, 15b, 15c of the bracket 10 for assembly with the bracket 10.
a, 24b and 24c are formed.

The output shaft 21 is sealed by a bearing to be waterproof. By providing the output shaft 21 on the center shaft of the worm wheel gear in this manner, waterproofing is facilitated by the worm wheel gear bearing and the like. The output shaft 21 is connected to a rotating member 30 described below.

The rotating member 30 of this embodiment is formed of an L-shaped crank member, and has a connecting hole 31 formed so that one end is fixed to the output shaft 21, and the other end is connected to the elastic member 40. Projection 32 is formed as described above. The rotating member 30 is assembled with the output shaft 21 by a nut 34 via a washer 33.

The elastic member 40 of this embodiment is for appropriately correcting the difference between the opening / closing stroke of the fuel cut-off valve and the reciprocating stroke of the actuator, and is constituted by a coil spring. Part 32
And key portions 41 and 42 to be respectively engaged with the connecting member 50 described below.

The connecting member 50 of this embodiment has a connecting portion (cable connecting hole) 51 with the elastic member 40 and a connecting portion (connecting pin) 52 with the cable 60. That is, it is a member having a U-shaped cross section formed by connecting opposed wall surfaces 53 and 54 with a connection surface 55, and a cable connection hole 5 is provided near one end of the wall surface 53 on the upper surface (FIG. 6) side of the opposed wall surface.
1 is formed, and the cable connection hole 51 is
1a is formed.

Holes 52a and 52b are formed in opposed wall surfaces 53 and 54 near the end opposite to the cable connection hole 51. The connection pins 52c are provided in the holes 52a and 52b. This connecting pin 52
c extends through the holes 52a, 52b of the opposed wall surfaces 53, 54 and projects from the opposed wall surfaces 53, 54. As shown in FIG. 6, the connecting pin 52c of the present example
A head 52d, a foot 52e, and a groove 52f are formed on the foot side.

Then, the connecting pin 52c is passed through the hole 52a from the wall surface 53 via the ring 55a, and
The ring 55b is attached to the foot 52e extending from the front end 4, and the ring stopper 55c is fitted into the groove 52f on the foot side. At this time, two rings 56a and 56b are provided inside the opposed wall surfaces 53 and 54. The key portion 42 of the elastic member 40 is located between the two rings 56, a, and 56b so as to be clamped. Accordingly, the key portion 42 of the elastic member 40 is sandwiched between the rings 56a and 56b, and the connecting member 50 is sandwiched between the rings 55a and 55b.

The actuator case 70 of the present embodiment is shown in FIG.
As shown in FIG. 6 to FIG. 6, it has a rectangular hollow cylindrical shape, and a bottom surface 71 extends in a longitudinal direction from an upper surface 72.
Further, guide grooves 71 a and 72 a as guide portions are formed on the inner facing surface of the upper surface 72. Further, the connecting holes 73a, 73b, 73
c is the mounting hole 16a, 16b,
16c.

A connecting pin 61 is connected to one end of the cable 60.
The other end is connected to a fuel cutoff valve B provided in a fuel supply pipe P of the diesel engine E, as shown in FIG. The connecting pin 61 of this example has a cylindrical shape. The cable 60 is fixed to the bracket 10 by the cable fixing plate 11.

Next, the assembling of the fuel cut actuator S having the above configuration will be described. That is, as shown in FIG.
At this time, the output shaft 21 of the speed reduction unit 20 is exposed through the opening 12 of the bracket 10.

Next, the connecting screw holes 15a, 15b, 15c of the bracket 10 and the screw holes 24a, 24b, 24c of the speed reduction unit 20 are assembled together with the screws 26a, 26b, 26c. Then, the output shaft 21 of the speed reduction unit 20 is inserted into the connection hole 31 of the rotating member 30, and integrally connected with the nut 34 via the washer 31.

The actuator case 70 is provided with connecting holes 73a, 73b, 73c of the actuator case 70.
Then, the bracket 10 is assembled integrally with the bracket 10 by using screws, anchor clips 74a, 74b and 74c in the mounting holes 16a, 16b and 16c of the bracket 10.

The projection 32 of the rotating member 30 and the key 41 of the elastic member 40 are assembled. Next, the key portion 42 on the other end side of the elastic member 40 is connected to the connecting pin 52 of the connecting member 50.
c. At this time, the key portion 42 of the elastic member 40 is engaged so as to be located between the rings 56a and 56b.

Then, the connecting member 50 is disposed in the actuator case 70. At this time, the actuator case 7
The connecting pins 5 are formed in the guide grooves 71a and 72a formed in
The head 52d of 2c and the tip of the foot 52e are engaged.
Next, the cable 6 is inserted into the cable connection hole 51 of the connection member 50.
The 0 connection pin 61 is engaged.

Thus, the connecting member 50 is located in the actuator case 70 and is connected to the cable 60 on the one hand and to the elastic member 40 on the other hand. Further, in this example, when the projection 32 is at the position P, the cable connection hole 51 of the connection member 50 is configured to be exposed from the actuator case 70.

Next, the operation of the fuel cut actuator S having the above configuration will be described. When the motor M is driven, a worm (not shown) of the output shaft of the motor M rotates, and a worm wheel gear meshing with the worm rotates. Since the center axis of the worm wheel gear is the output shaft 21, the rotation of the worm wheel gear causes the output shaft 21 to rotate.

Then, with the rotation of the output shaft 21, the rotating member 30 connected to the output shaft 21 rotates. The rotating member 30 slides the connecting member 50 connected via the elastic member (spring) 40 in the actuator case 70. At this time, the connecting pins 52c of the connecting member 50 are connected to the guide grooves 71a, 7
2a and is guided by the guide grooves 71a and 72a to perform a linear reciprocating motion. And this connecting member 5
The cable 60 connected to 0 also performs a linear reciprocating motion.

Since the elastic member 40 and the connecting member 50 are covered by the actuator case 70, these members are protected from being directly exposed to water and mud. In the position P, the cable connection hole 51 is
The cable 60 is configured to be exposed from the
It has a structure that can be easily detached only.

As described above, the elastic member 40 can be covered with the actuator case 70 to cover the water-bearing and mud-bearing parts, and except for this cover part, the distance from the output shaft 21 to the cable 60 can be reduced. By exposing the portion to the outside and further exposing the cable connecting hole 51 of the connecting member 50 to the outside with the cable 60 being most loosened, the exchange of the cable 60 can be extremely easily performed.

FIG. 7 is a perspective view showing another example of the rotating member. In the above embodiment, an example in which an L-shaped crank is used as the rotating member 30 has been described. However, in the rotating member 80 of the present embodiment, a connecting portion 81 with the output shaft 21 is formed at the center.
1, connecting arms 82 and 83 having different lengths are formed on both sides. The coupling arms 82 and 83 have engaging holes 82a and 83a, respectively.
Are formed.

The connecting portion 81 of this embodiment is formed as a connecting hole, and the connecting arms 82 and 83 of this embodiment are formed of plate members having substantially the same width. The connection between the output shaft 21 and the elastic member 40 is the same as in the above-described embodiment. Further, in this example, when the elastic member 40 is a coil spring, the distance between the key portion 41 and the coil portion is increased, or the shape of the key portion 41 is set by providing a step to prevent interference with the rotating member 40. To prevent.

With this configuration, for example, the output shaft 2
Engagement hole (connection portion) between the first connection portion 81 and the elastic member 40
If the distances from 82a and 83a are P1 <P2, P1
Assuming that the cable pulling length at time ₁ is l ₁ and the cable pulling length at P ₂ is l ₂ , then l ₁ <l ₂ , and by selecting the coupling portions (that is, the engaging holes 82 a and 83 a), Changing the cable pull length is very easy. Since the output shaft 21 and the rotating member 80 are formed so as to be exposed to the outside, the elastic member 40 and the rotating member 80 are formed.
It is very easy to connect with the, and it is versatile.

FIG. 8 is a perspective view showing still another example of the rotating member. In each of the above-described examples, the example in which the crank-shaped member is used has been described. However, in the present embodiment, the rotating member 90 is illustrated in the case of using a disk-shaped member. That is, in the center of the disk main body 90a,
A connection hole (connection portion) 91 with the output shaft 21 is formed.
A plurality of connecting holes 92 a, 92 b, 92 c, 92 having different distances from the connecting hole 91, respectively, on the outer periphery of the connecting hole 91.
forming d. For example, in this example, every 90
a, 92b, 92c, 92d are P1 <P2 <P3 <P4
And

Accordingly, the connection holes 92a, 92b, 9
By selecting one of 2c and 92d, 4
It is possible to select different types of cable pulling length.

In this embodiment, each of the connection holes 92a, 92b, 92
Although an example is shown in which c and 92d are configured to be 90 degrees, it is also possible to form more connection holes and increase the distance in order. Note that, also in this embodiment, the elastic member 40 has the same configuration as the embodiment of FIG.

Since the rotating member 90 is exposed to the outside as described above, the elastic member 40 connected to the rotating member 90
By changing the connection state of the cable 60, it is extremely easy to change the pulling length of the cable 60.

In addition to the above, each of the above embodiments has the following operational effects. That is,
Since the actuator case 70 is formed so as not to cover the motor M, the heat generated by the motor M does not remain, and
It is not easily transmitted to the worm wheel gear of 0 and does not adversely affect it.

Since the actuator case 70 is configured as a cover having a minimum necessary size, it is sufficient to cover the azimuth to be wet or muddy, and it is not necessary to cover in all directions. Become.

When the projection 32 is at the position P, the connecting member 50 is exposed at the end of the cover, so that the cable can be easily replaced. Since the fixing hole for the vehicle body is separate from the actuator case 70, it is not limited to a specific vehicle, and has great versatility.

[0057]

According to the fuel cut actuator of the present invention, the minimum required portion of the actuator is wetted,
Since the mud bearing portion is covered, the versatility can be increased.

Since the actuator case has a guide portion for the connecting member and guides and slides the connecting member on the guide portion, the cable performs a linear sliding motion, so that the cable cannot be driven by the motor. Cable so that it is not damaged. Further, since the actuator case covers the connecting member and the elastic member, it is possible to prevent the sliding portion of the cable from being directly exposed to water or mud. Since the connecting member has a connecting portion with the elastic member and a connecting portion with the cable, if only the cable is damaged, the structure can be easily detached and attached, and only the cable replacement is required. Can be easily done.

Since the output shaft is exposed to the outside and the connecting member has a connecting portion with the elastic member and a connecting portion with the cable, the assembling operation is performed from outside the fuel cut actuator S. Can be easily replaced.

As described above, in the present invention, the actuator case has the guide portion of the connecting member, and guides and slides the connecting member on the guide portion, and covers the elastic member. Can be used as a cover for the minimum necessary portion, and the versatility can be increased.

[Brief description of the drawings]

FIG. 1 is a plan view of a fuel cut actuator according to the present invention.

FIG. 2 is a side view of the fuel cut actuator.

FIG. 3 is a plan view of a cover member.

FIG. 4 is a view as viewed from an arrow AA in FIG. 3;

FIG. 5 is a side view of the cover member.

FIG. 6 is an exploded perspective view of a fuel cut actuator according to the present invention.

FIG. 7 is a perspective view showing another example of the rotating member.

FIG. 8 is a perspective view showing still another example of the rotating member.

FIG. 9 is a plan view showing a conventional fuel cut actuator.

FIG. 10 is an explanatory sectional view showing another conventional example.

FIG. 11 is an explanatory sectional view showing still another conventional example.

FIG. 12 is a partial plan view of FIG. 11;

FIG. 13 is an explanatory perspective view of a conventional slide and guide.

FIG. 14 is a schematic explanatory view showing a connection state between a fuel cut actuator and a diesel engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bracket 11 Cable fixing plate 12 Opening 13, 14 Engagement part 13a, 14a Screw hole 15a, 15b, 15c Connection screw hole 16a, 16b, 16c Mounting hole 20 Reduction part 21 Output shaft 23 Casing 24a, 24b, 24c Screw Hole 30 Rotating member 31 Connection hole 32 Projection 33 Washer 34 Nut 40 Elastic member 41, 42 Lock part 50 Connection member 51 Connection part (cable connection hole) 51a Notch 52 Connection part (connection pin) 52a, 52b Hole 52c Connection pin 52d Head 52e Foot 52f Groove 53,54 Wall 55 Connection surface 55a, 55b, 56a, 56b Ring 60 Cable 61 Connection pin 70 Actuator case 71 Bottom surface 71a, 72a Guide groove 72 Top surface 73a, 73b, 73c Connection hole 80 Rotating member 81 Connecting portions 82, 83 Connecting arms 82a, 83a Engaging holes 90 Rotating member 90a Disc body 91 Connecting holes (connecting portions) 92a, 92b, 92c, 92d Connecting holes M Motor S Fuel cut actuator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F02M 37/00 311

Claims (4)

(57) [Claims] 1. A motor having a bracket, a speed reducer having an output shaft exposed to the outside, a rotating member mounted on the output shaft of the speed reducer, and an elastic member having one end attached to an end of the rotary member. A member, a connecting member provided at the other end of the elastic member, a cable connected to the connecting member, and an actuator case, and assembling the motor and the actuator case to the bracket, and rotating the rotating member. An actuator formed by causing the elastic member to reciprocate linearly to cause the cable to reciprocate linearly, wherein the connecting member has a connecting portion to the elastic member and a connecting portion to the cable, and the actuator case is A fuse having a guide portion of a connecting member, wherein the guide portion guides and slides the connecting member and covers the elastic member. -L-cut actuator. 2. The fuel cut actuator according to claim 1, wherein the speed reduction unit includes a worm formed on a motor output shaft, and a worm wheel gear that meshes with the worm. A fuel cut actuator which is output by a central axis of a worm wheel gear and rotates the rotating member. 3. The fuel cut actuator according to claim 1, wherein the actuator case does not cover the rotating member. 4. The fuel cut actuator according to claim 1, wherein the actuator case does not cover a connecting portion of the connecting member to a cable.