JP2512843Y2 - Shaft coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a convex groove that engages with a concave groove formed on an end surface of a drive shaft and a convex groove that engages with a concave groove formed on an end surface of a driven shaft. A groove having a ridge and parallel planes respectively forming the two convex ridges being orthogonal to each other, and eccentricity between the drive shaft and the driven shaft is allowed The present invention relates to a shaft coupling in which the projection and the ridge are engaged with each other without play, and the turning torque is not increased by the eccentricity of the drive shaft and the driven shaft.

[Prior Art] FIG. 4 has been conventionally used for connection between a rotary shaft of a throttle valve arranged in an intake passage of an engine and a rotary shaft of a throttle valve opening sensor for detecting an opening of the throttle valve. 1 is a perspective view showing a configuration of an existing shaft coupling, wherein reference numeral 1 is a rotary shaft of a throttle valve, 2 is a rotary shaft of an opening sensor of the throttle valve, 3 is a shaft joint, and the rotary shaft of the throttle valve is shown. Groove 4 formed on the end surface of shaft (drive shaft) 1
And the convex ridge 5 engaging with the concave groove 4 of the rotation shaft (driven shaft) 2 of the throttle valve opening sensor are parallel planes forming the two convex ridges 5, respectively. 6 are orthogonal to each other and are parallel to each other by a groove 7 parallel to the parallel plane 6.
It is divided into two ridges. The shaft coupling 3 is made of a synthetic resin, and the mutually parallel ridges 8 divided by the groove 7 can be elastically curved. A rib 9 is formed outward at the tip of each of the two parallel ridges 8 that are parallel to each other. When the ridges 5 are respectively inserted into the concave grooves 4, the ribs 7 divide into two. The two parallel protrusions 8 which are parallel to each other are elastically curved inward, and the rib 9 and the concave groove 4 are formed.
And the eccentricity of the throttle valve rotation shaft 1 and the rotation shaft 2 of the throttle valve opening sensor are parallel to each other and form a groove. Is allowed by the sliding of the rib 9 and the rib 9 in the contact line direction.

Since the frictional force caused by the slipping appears as an increase in the rotational torque of the rotary shaft of the throttle valve, it becomes a problem as the electronic control of the ignition system and fuel system of the engine progresses to the motorcycle. It was A two-wheeled vehicle in which the throttle valve opening is manually operated is required to have a smooth operation feeling of the throttle valve as compared with a four-wheeled vehicle in which the throttle valve opening is operated by the force of the foot.

FIG. 5 shows the structure of the Oldham's joint for plane reciprocating motion disclosed in Japanese Utility Model Publication No. 54-161445. Reference numeral 1 is a drive shaft, 2 is a driven shaft, and 3 is a shaft joint formed on the end surface of the drive shaft 1. The concave groove 4 and the convex groove 5 formed on the end surface of the shaft coupling 3 facing the end surface are engaged with each other, and the convex groove 5 formed on the end surface of the driven shaft 2 is engaged.
And a recess formed in the end surface of the shaft coupling 3 facing the end surface of the driven shaft 2 are engaged with each other. Between the end face of the drive shaft 1 and the end face of the shaft joint 3 facing the end face, and between the end face of the driven shaft 2 and the end face of the shaft joint 3 facing the end face, there is a plane reciprocating bearing 10a. Although it is arranged, it is possible to prevent the driving torque from increasing due to the sliding frictional force between the opposing end surfaces due to the eccentricity between the driving shaft 1 and the driven shaft 2, but it is possible to prevent the driving torque from increasing due to the parallel plane. An increase in drive torque due to sliding friction with the parallel planes forming the protrusions 5 is not eliminated, and the drive shaft 1 is formed by the clearance between the parallel planes forming the concave grooves 4 and the parallel planes forming the protrusions 5. There is play in the direction of rotation with the driven shaft 2.

FIG. 6 shows the structure of the Oldham joint disclosed in Japanese Utility Model Laid-Open No. 62-45424, which is formed on the end surface of the joint 3 and the parallel plane forming the convex ridge 5 formed on the end surface of the drive shaft 1 or the driven shaft 2. The rolling contact 10b is arranged between the parallel plane forming the groove 4 and the frictional force of the slip between the groove 4 and the ridge 5 due to the eccentricity between the drive shaft 1 and the driven shaft 2. Although the increase of the turning torque is canceled, it is impossible to make the distance between the parallel plane forming the concave groove 4 and the parallel plane forming the convex groove 5 and the diameter of the contactor 10b completely equal. Therefore, the play in the rotational direction between the drive shaft 1 and the driven shaft 2 is not eliminated.

[Problems to be solved by the invention] There is no play in the rotating direction between the drive shaft (throttle valve rotating shaft) and the driven shaft (rotating shaft of the throttle valve opening sensor), and the drive shaft and the driven shaft are free. It is an object of the present invention to obtain a shaft coupling that does not cause an increase in turning torque due to eccentricity with.

[Means for Solving the Problem] The present invention has a convex groove that engages with a concave groove formed on the end surface of the drive shaft and a convex groove that engages with a concave groove formed on the end surface of the driven shaft.
The parallel planes respectively forming the two convex ridges are orthogonal to each other, and the eccentricity between the drive shaft and the driven shaft forms the concave groove or the convex ridge between the concave groove and the convex ridge. In a shaft coupling that is allowed by a change in relative position along the parallel plane and is made of synthetic resin, each of the protrusions has two parallel grooves formed by a groove parallel to the parallel plane that forms the protrusion. It is divided into two bulges which can be elastically bent, and through holes are alternately bored in the bisected two ridges at equal intervals, and spheres are rotatably arranged in the through holes. The concave groove formed on the end surface of the drive shaft and the concave groove formed on the end surface of the driven shaft can be elastically engaged with each other without a gap.

[Operation] The shaft joint is made of synthetic resin, and the spherical body is positioned in the through hole formed in one of the convex ridges which is divided into two by the groove and can be elastically curved, and is driven with the other convex ridge. Since it is elastically compressed and arranged between the shaft or the driven shaft and one surface of the parallel plane forming the concave groove formed on the end face of the shaft or the driven shaft, the drive shaft and the passive shaft engage with the shaft joint without play, Due to the eccentricity of the drive shaft and the driven shaft, the positional deviation between the concave groove formed in the end face of the drive shaft or the driven shaft and the convex ridge formed in the end face of the shaft coupling is
Since the rotation is performed via the rolling sphere, the torque of the drive shaft does not increase.

It is sufficient for the diameter of the through hole in which the sphere is arranged to be larger than the diameter of the sphere by at least ½ of the amount of eccentricity that can occur between the drive shaft and the driven shaft. Even when the value is smaller than the above value, if the through hole and the sphere are in a loose state, the sphere of the ball bearing can roll in the same manner as the sphere retainer can be positioned and rolled by the drive shaft. There is no increase in the turning torque due to the eccentricity with the driven shaft.

[Embodiment] FIG. 1 is a perspective view showing a structure of a shaft coupling of the present invention and a relationship between a drive shaft and a driven shaft. Reference numeral 1 is a drive shaft (throttle valve rotating shaft) and 2 is a driven shaft (throttle valve). (Rotation axis of the opening sensor), 3 is a shaft joint, 4 is a concave groove formed in the end surface of the drive shaft 1 or the driven shaft 2, and 5 is a convex groove formed in the end surface of the shaft joint 3. By the groove 7 parallel to the parallel plane 6 forming the ridge 5,
It is divided into two ridges 8 parallel to each other. The shaft coupling 3 is made of a synthetic resin material (for example, polyacetal) and can be elastically bent. That is, it has flexibility. Reference numeral 10 denotes a sphere made of, for example, stainless steel (SUS440 or SUJ), which is arranged in a through hole 11 formed in the bisected convex ridge 8. The through holes 11 are alternately formed in the two protrusions 8 at equal intervals.

In the embodiment shown in FIG. 1, one through-hole 8a has two through holes 11a.
If one is formed, another through hole 8b is formed with one through hole 11 at an intermediate position between the above two through holes 11. The number of the through holes 11 is not necessarily limited to two in one convex ridge 8 and one in the other convex ridge 8, and may be three in one and two in the other.
All of those in which the spheres 10 are arranged by alternately piercing at equal intervals are included.

2 is a longitudinal sectional view of the shaft coupling 3 of the present invention after the drive shaft 1 and the driven shaft 2 are engaged, and FIG. 3 is a sectional view taken along the line III-III of FIG. In FIG. 3, the sphere 10 is not taken in cross section. Before the convex ridge 5 and the spherical body 10 of the shaft coupling 3 are inserted into the concave groove 4 of the drive shaft 1 or the driven shaft 2, a half of the width w of the groove 7 that divides the convex ridge 5 and the spherical body 10 are formed. The protrusion 5 of the shaft coupling (that is, the protrusion 8 divided into two by the groove 7) is formed so that twice the difference h from the diameter d of the groove is larger than the width W of the groove 4. )
Since the bisected ridges 8 are elastically curved in a direction in which they approach each other and are inserted into the groove 4 together with the spherical body 10, the drive shaft 1 and the driven shaft 2 are connected to each other without play in the rotational direction. The positional deviation between the concave groove 4 and the convex groove 5 due to the eccentricity between the two shafts is performed via the rolling sphere 10, and the eccentricity is allowed without increasing the torque. Generally, it is sufficient that the eccentricity between the drive shaft 1 and the driven shaft 2 is within 0.3 mesh, and the gap between the through hole 11 and the spherical body 10 is between 0.1 and 0.2 mesh.

The shaft joint of the present invention has been described with reference to the shaft joint connecting the rotary shaft of the throttle valve and the rotary shaft of the throttle valve opening sensor as an example. The invention is not limited to the shaft coupling used for connecting the valve opening sensor to the rotating shaft.

[Advantages of the Invention] As described above, the shaft coupling of the present invention can connect the drive shaft and the driven shaft without play in the rotation direction, and does not increase the rotation torque due to the eccentricity between the two shafts. There are advantages.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of the shaft joint of the present invention and the relationship between the drive shaft and the driven shaft, and FIG. 2 is a longitudinal sectional view of the shaft joint of the present invention after engagement of the drive shaft and the driven shaft. , Fig. 3 is III- of Fig. 2.
It is a III cross-section arrow view. FIG. 4 shows a structure of a shaft coupling conventionally used for connecting a throttle valve rotation shaft arranged in an intake passage of an engine and a rotation shaft of a throttle valve opening sensor for detecting an opening of the throttle valve. Fig. 5 is a perspective view showing Fig.
FIG. 6 is a block diagram of the Oldham joint for plane reciprocating motion disclosed in No. 445, and FIG. 6 is a block diagram of the Oldham joint disclosed in Japanese Utility Model Laid-Open No. 62-45424. 1 ... driving shaft, 2 ... driven shaft, 3 ... shaft joint, 4 ... concave groove, 5 ... convex, 6 ... parallel plane, 7 ... groove, 8 ... 2
Divided convexity, 10 …… sphere, 11 …… through hole.

Claims (1)

(57) [Scope of utility model registration request] 1. A ridge (5) engaging with a groove (4) formed on an end surface of a drive shaft (1) and a groove (4) formed on an end surface of a driven shaft (2). And a convex ridge (5) that fits,
The parallel planes respectively forming the two convex ridges (5) are orthogonal to each other, and the eccentricity between the drive shaft (1) and the driven shaft (2) is the same as the concave groove (4) and the convex ridge. A shaft coupling which is allowed by a change in relative position with the ridge (5) along the parallel plane forming the concave groove (4) or the convex groove (5) and which is a synthetic resin molding, Of said ridge (5) is bisected into two parallel, resiliently bendable ridges (8) by a groove (7) parallel to the parallel plane forming said ridge (5), Through holes (11) are alternately bored at equal intervals in the two divided ridges (8), and spherical bodies (10) are rotatably arranged in the through holes (11). Concave groove (4) and driven shaft (2) formed on the end face of (1)
Elastically in each of the concave grooves (4) formed on the end surface of
A shaft coupling that can be engaged without a gap.