JPH10159862A - Shaft coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow common use for different shaft diameters by inserting a turning shaft and a driven shaft into shaft holes in the first and second members, each of which consists of two split bodies and can be freely expanded/shrunk in the diameter direction, and connecting both members together in the axial direction by means of a shearing key type third member. SOLUTION: The first and second members 1, 2 are constructed of half-cylinder type joining bodies 10a, 10b, 20a, 20b, which are prepared by division into two pieces along the center of shaft holes 11, 12 individually. The first and second members 1, 2 are joined mutually by means of bolts 12, 22 crossing the axial directon at right angles, and an interval between the joined faces is expanded/shrunk so as to expand/shrink diameters of the shaft holes 11, 21, so that a turning shaft and a driven shaft whit different diameters can be connected together. On the member 1 lower end face and the member 2 upper end face, grooves 13, 23 provided with dovetail type cross sections are formed through the center orthogonally to the axial direction. In the member 3, which is a shearing key with a double enveloping type cross section, the upper half part is inserted into the groove 13 while the lower half part is inserted into the groove 23, and the members 1, 2 are connected together in the axial direction by means of the member 3. The member 3 inserted into the grooves 13, 23 is prevented from coming off by means of a stopper 5. Therefore, several kinds of shafts with different shaft diameters can be connected together by means of a single shaft coupling, and their stocks can be reduced greatly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft joint for connecting two rotating shafts having different shaft diameters in the axial direction.

[0002]

2. Description of the Related Art Conventionally, both shafts are connected to each other such as a drive shaft of an actuator of a butterfly valve and a valve rod for supporting a valve body, and the rotating power of one shaft (rotating shaft) is applied to the other shaft. In order to transmit to the (driven shaft), a shaft joint that can connect both shafts to each other is used. Conventionally known shaft joints are connected by one shaft joint having a joint portion that matches the cross-sectional shape of the shaft end of both shafts. For this reason, every time the shaft diameter or combination of the rotating shaft and the driven shaft is different, it is necessary to prepare shaft joints according to each shaft diameter and combination, and the number of prepared shaft joints is enormous. And the amount, location, and cost of stocking parts are increasing. For example,
When the actuator has 14 types of drive shaft diameters, 14 types of shaft joints have to be prepared even if the valve rod diameter is 5 types.

[0003] Japanese Patent Application Laid-Open No. Hei 5-288223 discloses an invention of a shaft joint. The shaft joint disclosed in this publication discloses an eccentricity, an eccentricity and an eccentricity between a rotating shaft and a driven shaft. The purpose of the present invention is to cope well with the thrust movement, and does not mean that a plurality of shafts having different shaft diameters can be shared by a smaller number of shaft joints and connected.

[0004]

The present invention achieves a common shaft joint by using a plurality of rotation shafts and driven shafts having different shaft diameters as shaft joints capable of coping with different shaft diameters. It is intended to provide a joint without thrust movement at the joint part.

[0005]

In order to solve the above-mentioned problem, the present invention adopts a second aspect of the present invention which comprises two divided bodies which penetrate a shaft hole at the center and are freely expandable and contractable in a radial direction perpendicular to the axial direction. A first member, a third member in the form of a shear key that engages with both members across the joining end surfaces of the first and second members,
A rotation shaft and a driven shaft are inserted and fixed in shaft holes of the first and second members, and the first and second members are axially connected by a third member.

Further, a groove having a dovetail shape in cross section is formed in the joint end face between the first member and the second member, and the third member is a shear key having a drum shape in cross section which is engaged with the groove.

Further, the groove into which the third member is engaged is defined by the first and second grooves.
It is characterized in that it is formed on both end faces of the member.

Further, the stopper is provided to prevent the third member from coming off.

Furthermore, the diameter of the first member and the diameter of the second member are different.

[0010] Further, the present invention is characterized in that a rotating shaft or a driven shaft is integrally connected to the first member or the second member in advance.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below. The shaft joint according to the present invention moves the first member fixed to the rotating shaft end, the second member fixed to the driven shaft end, and the first member and the second member in the axial direction (thrust movement). And a third member capable of blocking and coupling. The first member and the second member each have a hole-shaped shaft chuck portion capable of receiving the shaft end of the rotating shaft or the driven shaft and holding the shaft end in a fixed state, and a direction orthogonal to the axial direction. It is possible to change the inner diameter of the shaft chuck portion within a predetermined range. The third member is composed of a shear key-shaped member disposed over the joint between the first member and the second member, and joins the first and second members while preventing thrust movement. A key member-shaped third member insertion portion for receiving the third member is formed on the joint surface between the first member and the second member.

The first member and the second member are composed of two parts which are divided into two parts along the axis. The diameter of the shaft chuck part is changed by changing the joining interval between the two parts, so that different diameters are obtained. Can accept and hold the axis. The two parts are joined by a bolt. The shaft chuck portion is formed in a rectangular tube shape having a rectangular cross section, but is not limited to this. Any shape may be used as long as it can hold the shaft inserted into the shaft chuck in a detented state. One of the first member and the second member may be integrally connected to the rotating shaft or the driven shaft. The key member-shaped third member insertion portion may be formed not only on one end surface in the axial direction of the first and second members but also on both end surfaces, and may be connectable from any of the upper and lower directions in the axial direction.

The third member in the form of a shearing key is a key member having a drum-shaped cross section whose center is constricted. The upper half portion is the third member insertion portion of the first member, and the lower half portion is the third member of the second member. The first member and the second member are connected by the third member by being inserted into the member insertion portions, respectively, and the first and second members are brought closer to each other by the key action of the third member, so that the first member and the second member are firmly connected. The joined state appears, and the axial movement of the first and second members is prevented.

[0014]

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 5, (1) is a first member constituting a shaft joint according to the present invention, and (2) is a second member, and both members have substantially the same structure. The two members (1) and (2) are cylindrical members formed at the center through the square cylindrical shaft holes (11) and (21), and the shear key inserted across the joint surface of the two members. With the third member (3) in the shape of
Connected in the axial direction. Both members (1) and (2) are semi-cylindrical divided bodies (10a) (10b) (20a) divided into two along the center of the shaft hole.
(20b) consists of a joined body, each joined body (10a) (10b)
Alternatively, (20a) and (20b) are joined to each other by bolts (12) and (22) extending in a direction perpendicular to the axial direction, and the joined bodies (10a) (10b) or ( The distance between the joining surfaces 20a and 20b can be enlarged or reduced. By increasing or reducing the distance between the joining surfaces, it is possible to increase or decrease the diameter of the shaft holes (11) and (21). Within the range of the expansion and contraction, the rotation shaft (4) or the driven shaft having a different diameter can be used. Can be connected. FIG. 4 shows a state where the diameter of the shaft hole (11) is expanded, and the shaft hole (1) is enlarged.
1) can be scaled in the range of l ₁ to l ₂ .

The third member (3) is inserted into the mutually joined end surfaces of the first member (1) and the second member (2), ie, the lower end surface of the first member and the upper end surface of the second member in FIG. (13) and (23), which are third member insertion portions having a dovetail shape in cross section, are formed in the direction perpendicular to the axial direction through the center. Third member (3)
Is a shearing key having a central section of a drum-shaped cross section. The first half is inserted into the groove (13) of the first member, and the lower half is inserted into the groove (23) of the second member. Member (1) and second member (2)
And can be connected to each other in the axial direction. When the third member is connected, the shape of the third member (3) is in the shape of a drum, and the grooves (13) and (23) for inserting the third member are in the shape of a dovetail. The tightening force due to the wedge effect of the groove and the key acts, and the first member (1) and the second member (2) can be connected while approaching each other. The third member (3) inserted into the groove is prevented from coming off by the stopper (5).

FIG. 6 shows a modification of the shaft joint according to the present invention, in which grooves (13) and (13) for inserting the third member into both upper and lower end surfaces of the first member (1) and the second member (2). 23)
The other points are substantially the same as those shown in FIGS. By forming the grooves (13) and (23) on both end surfaces of the first and second members (1) and (2), both members (1) and (2) can be joined at any end surface, The workability of connecting the rotation shaft and the driven shaft is improved. FIG. 7 shows the first member and the second member having different diameters, and the other points are the same as those shown in FIGS. The embodiment of FIG. 7 is suitable for connection when the diameters of the rotation shaft and the driven shaft are different, such as a large-diameter rotation shaft and a small-diameter driven shaft. In this case, the third member (3)
Use a member whose length matches the diameter of the small-diameter member (2). FIG. 8 shows the first member (1) in which the rotating shaft (4) is integrally connected in advance. Of course, the driven shafts may be integrally connected.

[0017]

According to the present invention, several types of shafts having different shaft diameters can be connected by one shaft joint, and the stock amount of the shaft joint can be greatly reduced. Also, the first
Since the member and the second member are connected by the third member capable of exerting a tightening force by a wedge effect, thrust movement in the axial direction can be prevented, and the shaft can be surely integrated. Further, even after the equipment is mounted, it is possible to change the shaft and connect the shafts with different shaft diameters at the equipment mounting site.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a shaft joint according to the present invention.

FIG. 2 is a perspective view showing a state where shafts are connected;

FIG. 3 is an exploded perspective view.

FIG. 4 is a plan view of a first member.

FIG. 5 is a side view of the same.

FIG. 6 is a perspective view showing a modification.

FIG. 7 is a perspective view showing another modification.

FIG. 8 is a perspective view showing still another modification.

[Explanation of symbols]

 (1) First member (2) Second member (3) Third member (4) Rotating shaft (5) Stopper (10) Split body (10a) Joint body (10b) Joint body (11) Shaft hole (12 ) Bolt (20) Split body (20a) Joint body (20b) Joint body (21) Shaft hole (22) Bolt

Claims (6)

[Claims] 1. A first and a second member which penetrates a shaft hole at the center and is expandable and contractable in a radial direction perpendicular to an axial direction, and straddles a joint end face between the first and the second members. And a third member in the form of a shear key engaged with both members. The rotation shaft and the driven shaft are inserted and fixed in the shaft holes of the first and second members. A shaft joint, wherein members are connected in an axial direction. 2. A groove-shaped groove having a dovetail shape in a joint end surface between a first member and a second member, and a third member is a shearing key having a drum-shaped cross-section which is engaged with the groove. The described shaft joint. 3. The shaft joint according to claim 2, wherein grooves into which the third member is engaged are formed on both end surfaces of the first and second members. 4. The shaft joint according to claim 1, wherein the stopper prevents the third member from coming off. 5. The shaft joint according to claim 1, wherein the first member and the second member have different diameters. 6. The shaft joint according to claim 1, wherein a rotation shaft or a driven shaft is integrally connected to the first member or the second member in advance.