JP2523276B2 - Connection structure of throttle opening detector with vaporizer - Google Patents

Description

The present invention relates to a structure for connecting a throttle opening detector to a carburetor.

[Prior Art] As a throttle opening detector for a carburetor used in an outboard engine or the like, one disclosed in Japanese Patent Laid-Open No. 59-190087 has been proposed. This throttle opening detector includes a detection shaft connected to the throttle shaft of the carburetor, and a contact provided at an end of the detection shaft is slidably contacted with a resistance board,
It is possible to detect the opening degree of the throttle shaft by the sliding position of the contact point on the resistance board.

Here, when the throttle opening detector is attached to the carburetor and its detection shaft is connected to the throttle shaft,
Since the contact provided on the detection shaft is weak against vibration, the vibration on the carburetor side is not transmitted to the detection shaft and a minute change in the throttle opening can be detected. It is desired that there is no backlash and that the workability of connecting the detection shaft and the throttle shaft is good.

On the other hand, the conventional connection structure between the throttle opening detector and the carburetor has a convex portion (or concave portion) provided at the end of the detection shaft and a concave portion (or convex portion) provided at the end of the throttle shaft. And a guide cylinder is attached to the outer peripheral portions of both shafts around the fitting portion, a structure in which the detection shaft and the throttle shaft are connected by an Oldham joint, or a detection shaft and the throttle shaft are connected to the outer peripheral parts of both. A structure is used in which a tubular rubber body fitted to the connection is used for connection.

[Problems to be Solved by the Invention] However, in the above-described conventional structure, the guide cylinder cannot eliminate the misalignment due to the unavoidable tolerance between the detection shaft and the throttle shaft. Since the convex portion and the concave portion are strongly pressed against each other due to the misalignment, a relatively large frictional force is generated between both shafts, so that the vibration on the carburetor side is easily transmitted to the detection shaft. Moreover, the presence of rattling on the fitting portion of both shafts is inevitable, and there is a limit to the improvement of detection accuracy.
Also, due to the misalignment of both shafts, the workability of connecting both shafts is poor.

Further, in the above-mentioned conventional structure, it is inevitable that there is rattling on the joint between the detection shaft and the throttle shaft and the Oldham joint, and there is a limit to the improvement of detection accuracy. Even if the Oldham coupling is made of elastic rubber or the like and the rattle is eliminated, the tightening margin of the joint between the shaft and the Oldham joint becomes excessive, resulting in a large frictional force between the shaft and the Oldham joint. Therefore, the vibration on the carburetor side is easily transmitted to the detection shaft, and the workability of connecting them is poor.

Further, in the above-mentioned conventional case, if the rigidity of the rubber body is set to be relatively small so as to reliably absorb the misalignment due to the tolerance between the detection shaft and the throttle shaft, the rubber body is distorted by the rotational torque of the throttle shaft. , The detection accuracy decreases.

When connecting the throttle opening detector to the carburetor, it is desirable to be able to keep the operating force of the throttle shaft low.

An object of the present invention is to make it possible to detect the throttle opening degree with high accuracy without transmitting vibration on the carburetor side to the detection shaft, and while suppressing the operating force of the throttle shaft to a low level.

[Means for Solving the Problems] The present invention includes a detection shaft connected to a throttle shaft of a carburetor, a contact provided at an end of the detection shaft is slidably contacted with a resistance board, and the contact is slidably contacted with the resistance board. In the connection structure with the carburetor of the throttle opening detector that detects the opening of the throttle shaft depending on the position, the shaft end of the throttle shaft is projected from the carburetor body, and extends at a right angle to the throttle shaft. An end of the existing driving arm is fixed, a bracket fixed to the carburetor body and supporting the detection shaft is provided, and a driven end extending at a right angle to the detection shaft is provided at the shaft end of the detection shaft. One end of the arm is fixed, both arms are formed of a resin material, and the other end of the driving arm and the other end of the driven arm are connected to each other via an engaging portion formed integrally with both arms. Both arms Are engaged in their rotational direction on the radius of gyration of the.

[Operation] According to the present invention, there are the following operation effects.

The rotational torque of the throttle shaft is transmitted to the detection shaft by the engagement of a driving arm extending in the direction perpendicular to the throttle shaft and a driven arm extending in the direction perpendicular to the detection shaft, and the engagement of both arms. The contact force generated at the joint part becomes smaller in proportion to the arm length of both arms, and the friction force generated at the engaging part of both arms can be made smaller, so the vibration generated at the carburetor side Transmission is blocked by the engaging parts of both arms and does not reach the detection axis. As a result, the contact provided on the detection shaft is always in stable sliding contact with the resistance plate, and no malfunction occurs.

Since the driving arm and the driven arm are formed of a resin material, and the engaging portions for engaging the driving arm and the driven arm are integrally formed on both arms, the structure of the engaging portion is simplified and both arms are formed. The friction coefficient of the engaging portion becomes low, the frictional force generated in the engaging portion can be further reduced, and the transmission of vibration from the throttle shaft side to the detection shaft can be blocked more reliably.

Since the driving arm and the driven arm are made of resin material, the weight of the portion overhanging from the throttle shaft and the detection shaft is light, and the throttle shaft operating force is low despite the fact that the detection shaft is connected to the throttle shaft. Can be suppressed.

Since both arms made of resin material and the throttle shaft and the detection shaft are separate members, the throttle shaft and the detection shaft are securely supported on the carburetor body and the bracket without wear, and the throttle opening It is possible to improve the detection accuracy of.

[Embodiment] FIG. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view schematically showing a main portion of FIG.
FIG. 3 is a perspective view schematically showing the main part of FIG. 1 in an exploded manner.

In the outboard motor 10, a clamp bracket 12 is fixed to a hull 11, and a swivel bracket 14 is attached to the clamp bracket 12 via a tilt shaft 13. Swivel bracket
A propulsion unit 18 is supported on the steering shaft 14 via a steered shaft 15 and upper and lower support members 16 and 17. An engine 19 is mounted on top of the propulsion unit 18, and the output of the engine 19 is a propeller.
It is said that 20 can be transmitted. The engine 19 is housed in the cowling 21.

The engine 19 is a V-type 6 cylinder engine, and the engine 19
A carburetor 24 (24A to 24C) and an intake box 26 are connected to each cylinder via an intake manifold 22 (22A to 22C). An intake passage 27 is formed in the carburetor 24, and the intake passage 27
Can be opened and closed by a throttle valve 29 fixed to the throttle shaft 28.

The carburetor 24 is provided with a throttle opening detector 30 that detects the opening of the throttle valve 29. The throttle opening detector 30 includes a housing 33 including a base portion 31 and a cap portion 32, a detection shaft 34 rotatably supported by the base portion 31 of the housing 33, and penetrating inside and outside the housing 33.
A resistance board 35 fixed to the inner surface of the cap portion 32 of the housing 33, and a resistance board 35 provided at the end of the detection shaft 34 located inside the housing 33 and having a predetermined size in the resistance board 35 in the axial direction of the detection shaft 34. The contact point 36 is configured to be capable of sliding contact with the resistance board 35 in a state of contacting with the contact pressure. That is, the throttle opening detector 30 is capable of detecting the throttle opening by the potentiometer method.
The rotation angle position of the detection shaft 34 can be detected by the sliding contact position of the contact 36 that rotates together with the detection shaft 34 with respect to the resistance board 35.

Here, the housing 33 of the throttle opening detector 30 is
It is fixed to the carburetor 24 by bolts 38 together with the bracket 37 via a gate-shaped mounting bracket 37.

As shown in FIGS. 2 and 3, the detection shaft 34 of the throttle opening detector 30 and the throttle shaft 28 of the carburetor 24 project from the carburetor body 101 at the shaft end of the throttle shaft 28. Then, one end of a driving arm 39 extending in the direction perpendicular to the throttle shaft 28 is fixed to this shaft end, which is fixed to the carburetor body 101 and allows the detection shaft 34 to be pivotally supported. A bracket 37 is provided, one end of a driven arm 40 extending in a direction perpendicular to the detection shaft 34 is fixed to the shaft end of the detection shaft 34, and both arms 39 and 40 are formed of a resin material, and The other end of the drive arm 39 and the other end of the driven arm 40 are integrally formed on both arms 39, 40 through engaging portions 39A, 40A (hole 39A, pin 40A). , Are made interlockable by engaging in their direction of rotation on a turning radius of 40 You. At this time, the driving arm 39 and the driven arm 40 are engaged with each other while the square hole portion 39A provided in the driving arm 39 and the square pin portion 40A provided in the driven arm 40 are fitted. Pin 40A and hole
39A has a square shape, and they are in surface contact with each other and engage with each other.

The driving arm 39 and the driven arm 40 are each made of a synthetic resin material having a low friction coefficient.

 Next, the operation of the above embodiment will be described.

The rotational torque of the throttle shaft 28 is transmitted to the detection shaft 34 by the engagement of a driving arm 39 extending in the direction perpendicular to the throttle shaft 28 and a driven arm 40 extending in the direction perpendicular to the detection shaft 34. The contact force generated at the engaging portions of both arms 39, 40 is reduced in proportion to the length of the arms of both arms 39, 40, and the friction force generated at the engaging portions of both arms 39, 40 is reduced. Therefore, the transmission of vibration generated on the carburetor 24 side is blocked by the engaging portions of both arms 39 and 40, and the detection axis
No more than 34. As a result, the contact provided on the detection shaft 34 is always stably in sliding contact with the resistance board 35, and no malfunction occurs.

The driving arm 39 and the driven arm 40 are formed of a resin material, and the engaging portions (39A, 40A) for engaging the driving arm 39 and the driven arm 40 are integrally formed on both arms 39, 40. The structure of the joints (39A, 40A) is simplified and the friction coefficient of the engaging parts of both arms 39, 40 is reduced,
By further reducing the frictional force generated by the engaging portion, it becomes possible to more reliably interrupt the transmission of vibration from the throttle shaft 28 side to the detection shaft 34.

Since the driving arm 39 and the driven arm 40 are made of a resin material, the weight of the portion overhanging from the throttle shaft 28 and the detection shaft 34 is reduced, and the throttle shaft 28 is connected to the detection shaft 34 in spite of being connected to the throttle shaft 28. The operating force of the shaft 28 can be kept low.

Since the arms 39 and 40 formed of a resin material and the throttle shaft 28 and the detection shaft 34 are separate members, the throttle shaft 28 and the detection shaft 34 do not wear against the carburetor body 101 and the bracket 37, respectively. The shaft is reliably supported, and the accuracy of detecting the throttle opening can be improved.

The holes 39A and the pin portions 40A of the arms 39 and 40 are angular and are in surface contact with each other, and are engaged with each other with a relatively low surface pressure. Even smaller, it is possible to more reliably block the transmission of vibrations from the throttle shaft 28 side to the detection shaft 34.

Further, the both arms 39, 40 are engaged in both directions of the opening direction and the closing direction of the throttle valve 29 via the fitting of the hole portion 39A and the pin portion 40A, respectively. Although rattling is involved in the engaging portion, the rotation angle of both shafts 28, 34 based on this rattling becomes small in proportion to the arm length of the engaging portion, and as a result, the throttle shaft 28 and detection Hysteresis (play) on the shaft 34 is minimized, and detection accuracy can be improved.

Further, the hole portion 39A as an engaging portion of the both arms 39, 40.
When there is rattling in the mating part between the pin 40A and the pin portion 40A, this rattling can be made relatively large for the above reason,
The workability of connecting the detection shaft 34 and the throttle shaft 28 is improved.

Further, since the hole portion 39A and the pin portion 40A of both the arms 39 and 40 are deeply fitted and engaged with each other, the throttle shaft 28 is securely engaged and disengaged from any vibration. It is possible to reliably transmit the change in the opening of the detection shaft 34 to the detection shaft 34.

 FIG. 4 is a perspective view showing a main part of a modified example of the present invention.

In FIG. 4, 51 is a throttle shaft of a carburetor, 52 is a driving arm, 61 is a detection shaft of a throttle opening detector, 62 is a driven arm, and 63 is an elastic body (coil spring). Both arms
52 and 62 are each formed of a synthetic resin material having a low friction coefficient. The elastic body 63 is interposed between the housing of the throttle opening detector and the driven arm 62, and
The planar engaging portion 62A of 62 is replaced with the planar engaging portion 52A of the driving arm 52.
The driven arm 62 so that it always presses with relatively low surface pressure.
Is giving a repulsive torque to. That is, the driven arm 62 of the detection shaft 61 is rotated in the opening direction by transmitting the rotational torque of the throttle shaft 51 from the driving arm 52 when the throttle shaft 51 is opened, and is repelled when the throttle shaft 51 is closed. The body 63 rotates in the closing direction together with the driving arm 52 while being pressed by the driving arm 52 by the elastic force of the body 63.

Therefore, also in the case of the above modification, the workability of connecting the detection shaft 61 and the throttle shaft 51 can be improved, and the throttle opening can be detected with high accuracy without transmitting the vibration on the carburetor side to the detection shaft 61. It will be possible. In this modification, the driving arm 52 and the driven arm 62 are always in pressure contact with each other by the elastic force of the elastic body 63 and are in an integrated state,
There is no possibility of inconvenience due to so-called rattling and rattling between the two arms.

Since the present invention does not have the joining means between the ends where the detection shaft and the throttle shaft are butted against each other,
The mounting space for the throttle opening detector in the axial direction of the throttle shaft can be made relatively small.

The present invention is also applicable to the case where a contact provided on the detection shaft uses a throttle opening detector that is in sliding contact with the resistance board in the direction perpendicular to the detection shaft.

[Advantages of the Invention] As described above, according to the present invention, it is possible to detect the throttle opening degree with high accuracy without transmitting a signal on the carburetor side to the detection shaft and while suppressing the operating force of the throttle shaft to be low. be able to.

[Brief description of drawings]

FIG. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, FIG. 2 is a sectional view schematically showing an essential part of FIG. 1, and FIG. 3 is an essential part of FIG. FIG. 4 is a schematic exploded perspective view, and FIG. 4 is a perspective view showing a main part of a modified example of the present invention. 19 …… Engine, 24 …… Vaporizer, 28 …… Throttle shaft,
30 …… Throttle opening detector, 34 …… Detecting axis, 35 …… Resistor board, 36 …… Contact point, 37 …… Bracket, 39 …… Driving arm, 30A …… Hole part (engaging part), 40… ... driven arm, 40A ...
… Pin part (engagement part), 40 …… Driven arm, 51 …… Throttle shaft, 52 …… Driving arm, 61 …… Detecting shaft, 62 …… Driven arm, 101 …… Vaporizer body.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G01B 7/30 G01B 7/30 C

Claims (1)

(57) [Claims] 1. A detection shaft connected to a throttle shaft of a carburetor, a contact provided at an end of the detection shaft is slidably contacted with a resistance board, and the opening of the throttle shaft is adjusted by a sliding contact position of the contact with the resistance board. In the connection structure of the throttle opening detector to detect and the carburetor, the shaft end of the throttle shaft is projected from the carburetor body, and one end of the driving arm extending in the direction perpendicular to the throttle shaft is attached to this shaft end. Fixed, provided with a bracket that is fixed to the carburetor body and axially supports the detection shaft, and fixes one end portion of the driven arm extending in the direction perpendicular to the detection shaft to the shaft end of the detection shaft, These arms are formed of a resin material, and the other end of the driving arm and the other end of the driven arm are connected to each other on the turning radius of both arms via an engaging portion integrally formed on both arms. Rotation of Connection structure between the carburetor of the throttle opening detector, characterized in that engaged in the direction.