JPH0558957U - Relay transmission shaft - Google Patents

Abstract

(57) [Summary] [Structure] The female coupling 1 is fitted to one end of the first shaft 20, the tip of the second shaft 21 is inserted into the receiving hole 4 of the female coupling 1, and the dovetail portion 12 is axially moved. By being extruded, the dovetail groove 3 is meshed and coupled. [Effect] Since the shaft is jointed by the coupling composed of the dovetail groove and the dovetail portion, the joint transmission shaft can be constructed very easily.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a relay transmission shaft suitable for transmitting a small torque.

[0002]

[Prior Art]

 Transmission shafts for mechanically transmitting power to a remote place are well known. If the transmission shaft does not have a certain degree of straightness, shaft runout will occur, so it is necessary to draw a thick round bar with a lathe to manufacture a good quality shaft. However, the transmission shaft due to this cutting becomes expensive.

Therefore, a method is conceivable in which a shaft made by an inexpensive drawing process is connected by an appropriate shaft joint.

[0004]

[Problems to be solved by the device]

 Flange type shaft couplings (JISB1451, 1452), spinning frame type universal shaft couplings (JISB1454), etc. are used as the above-mentioned suitable shaft couplings. is there.

In recent years, a sufficiently long transmission shaft having a diameter of about 1 to 3 mm has been adopted inside a video deck or the like, and it is necessary to join such a long transmission shaft with an appropriate shaft coupling. However, since a shaft joint standardized by JIS or a deformed joint thereof is too large and heavy, a more preferable intermediate transmission shaft is required.

[0006]

[Means for Solving the Problems]

 Therefore, the present invention is to be fitted to one end of the first shaft, a female coupling having a receiving hole for the second shaft and a dovetail groove for male coupling at the tip, and the female coupling. The coupling is composed of a male coupling having a protruding dovetail portion.

[0007]

[Action]

 The female coupling is fitted to one end of the first shaft, the tip of the second shaft is inserted into the receiving hole of the female coupling, and the dovetail portion is pushed out in the axial direction, so that the dovetail portion is meshed and coupled.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a female coupling according to the present invention. The female coupling 1 is formed by integrally forming dovetail grooves 3 and 3 at the tip of a cylindrical coupling body 2 and having a second shaft at the center of the shaft. The receiving hole 4 and the receiving hole 5 for the first shaft are formed so as to penetrate therethrough.

The female coupling 1 is made of POM (polyoxymethylene, also called polyacetal). POM is an engineering plastic excellent in mechanical strength and rigidity, fatigue resistance and dimensional stability, and has a very low specific gravity of 1.41 to 1.42.

FIG. 2 is a plan view of the female coupling, which is characterized in that the dovetail groove 3 has its inlet sandwiched by the ridges 6 and 6 having θ1 of 45 °.

FIG. 3 is a perspective view of a male coupling according to the present invention. The male coupling 10 has a dovetail portion 12, 12 protruding from the front surface of the coupling body 11, and a hole 13 is formed at the center of the shaft. , Has a collar 14.

The dovetail portion 12 has the shape of a pigeon tail and is used in pairs with the dovetail groove 3.

FIG. 4 is a plan view of the male coupling, and the convex portions 15 and 15 of the dovetail portion 12 are projected at θ2 of 45 °. The male coupling 10 is also made of the POM.

An example in which the first shaft and the second shaft are coupled by the above male coupling and female coupling will be described below.

FIGS. 5 (a) and 5 (b) are views showing the coupling of the relay transmission shaft of the present invention. As shown in FIG. 5 (a), the first shaft 20 is press-fitted into the receiving hole 5 of the female coupling 1. On the other hand, the second shaft 21 is inserted into the hole 13 of the male coupling 10. The protruding dimension d of the second shaft 21 is the same as or slightly smaller than the length of the receiving hole 4 of the second shaft.

Then, when the second shaft 21 is pushed out and inserted into the receiving hole 4 of the second shaft, and the male coupling 10 is strongly pressed against the female coupling 1, the dovetail groove 3 widens the inlet within the range of elastic deformation. The dovetail portion 12 contracts within the range of elastic deformation, so that the dovetail portion 12 meshes with the dovetail groove 3 as shown in FIG. 5B.

Since the second shaft 21 is inserted deeply into the female coupling 1, there is no concern that the male coupling 10 will move in the radial direction and come off, and the transmission torque will be transmitted from the dovetail portion 12 to the dovetail groove 3 or the same. On the contrary, it is transmitted smoothly.

Moreover, since the dovetail portion 12 and the dovetail groove 3 have some play in the diameter and the axial direction, the runout of one shaft is not transmitted to the other shaft.

FIG. 6 is a view showing an example of use of the relay transmission shaft of the present invention (the view is to be seen in the direction of the reference numeral). The first shaft 20 is a worm 23 and the second shaft 21 is a pulley. The 24 fixed components are connected to each other by the male and female couplings 1 and 10 as shown in FIG. 5 to form a relay transmission shaft.

When the intermediate transmission shaft is received by the bearing pieces 25 and 26 and the pulley 24 is rotated via the loading motor 27, the small pulley 28 and the belt 29, the worm 23 rotates the wheel 30.

In the figure, 31 is a retaining piece, which prevents the female / male couplings 1 and 10 from being separated by suppressing the flange 14 of the male coupling 10.

The relay transmission shaft structure of the present invention can be widely applied to small general-purpose machines as well as tape decks.

[0024]

[Effect of the device]

 As described above, according to the present invention, since the shaft is intermediately connected by the coupling including the dovetail groove and the dovetail portion, the intermediate transmission shaft can be constructed very easily. Therefore, the present invention provides a small-sized transmission shaft suitable for a small torque transmission system.

[Brief description of drawings]

FIG. 1 is a perspective view of a female coupling according to the present invention.

FIG. 2 is a plan view of a female coupling according to the present invention.

FIG. 3 is a perspective view of a male coupling according to the present invention.

FIG. 4 is a plan view of a male coupling according to the present invention.

FIG. 5 is a schematic diagram of the coupling of the relay transmission shaft of the present invention.

FIG. 6 is a view showing an example of using the relay transmission shaft of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Female coupling, 2 ... Coupling main body, 3 ... Dovetail groove, 4 ... Receiving hole for 2nd axis, 6 ... Convex ridge, 10 ... Male coupling, 11 ... Coupling main body, 12 ... Dovetail part, 15 ... convex part, 20 ... primary axis, 21 ... secondary axis.

Claims (1)

[Scope of utility model registration request] 1. A first shaft, a female coupling fitted to one end of the first shaft, having a receiving hole for the second shaft and a dovetail groove for a male coupling at the tip, and the dovetail groove. It consists of a male coupling with a protruding dovetail portion that fits into the shaft and a second shaft that penetrates and supports this male coupling. The tip of the second shaft is inserted into the receiving hole of the female coupling, and the dovetail portion is inserted into the shaft. It is a relay transmission shaft formed by engaging the dovedale portion with the dovetail groove by pushing in the direction.