JPH04111923U - Shaft with helical gear - Google Patents

Abstract

(57) [Summary] [Purpose] Form a twisted ridge in the same direction as the helical gear helix angle on the inner peripheral surface of the center hole of the helical gear or the outer peripheral surface of the pipe material, and This prevents loosening between the helical gear and the pipe material due to the axial thrust generated by the helical gear. [Structure] The shaft 1 with a helical gear has a tube material 2 and a helical gear 3. A helical protrusion 5 is formed in the same direction as the helical angle of the gear 3. On the other hand, the center hole 6 of the helical gear 3 has a slightly larger diameter than the twisted convex strip 5 of the tube material 2. And the center hole 6 of this helical gear 3
By inserting the twisted protrusion 5 of the tube material 2 into the tube material 2 and expanding the diameter of the small diameter portion 4 of the tube material 2 from the inside, the tube material 2 and the helical gear 3 are connected.
are fixed to obtain a shaft 1 with a helical gear.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a shaft with a helical gear.

0002

[Conventional technology]

Conventionally, a shaft with a helical gear was made using a splined pipe material. Insert into the center hole of the gear and pressurize the inner circumferential surface of the pipe material where this spline is formed. It is known that the diameter is expanded and a helical gear is fixed to the pipe material via a spline. Ru.

0003

[Problem that the idea aims to solve]

However, in the case where the helical gear is fixed to the pipe material through the above spline, This occurs in helical gears because the spline is formed parallel to the axis of the pipe material. Due to the axial thrust generated, slack may occur between the helical gear and the pipe material, causing it to come off in the axial direction. There were some problems.

0004 In view of this, the present invention is designed to prevent loosening against the axial thrust generated by helical gears. This was made for the purpose of providing a shaft with a helical gear.

[0005]

[Means to solve the problem]

Insert a tube into the center hole of the helical gear, pressurize the inner circumferential surface of the tube, and expand the diameter of the tube. In the case of an integrated helical gear, the outer peripheral surface of the pipe material or the center of the helical gear A screw having the same direction as the helix angle of the helical gear on either side of the inner peripheral surface of the hole. A helical gear is formed by forming twisted protrusions and fixing a helical gear to the pipe material via this twisted protrusion. It is characterized by:

[0006]

[Effect]

In the above-mentioned shaft with helical gear, the screw of the gear is inserted between the pressure contact surface of the tube material and the gear. A twisted protrusion is formed in the same direction as the twist angle, and the pipe material is fixed via this twisted protrusion. Therefore, the axial thrust of the helical gear is held by the twisted protrusion, and the axial thrust of the helical gear is The load applied to the tooth surface is carried by the twisted ridges between the pressure contact surfaces, so a strong bonding condition can be obtained. This prevents the helical gear from loosening or coming out of the pipe material.

[0007]

【Example】

Hereinafter, the present invention will be explained with reference to embodiments shown in FIGS. 1 to 5.

[0008] A shaft with a helical gear 1 has a tube material 2 as a shaft and a helical gear 3. are doing. The tube material 2 has a small diameter portion 4 having a length approximately corresponding to the tooth width of the helical gear 3. It is formed by machining, and the outer peripheral surface of this small diameter portion 4 has a torsion of the helical gear 3. Twisted protrusions 5 having the same direction as the corners are formed. Helical gear 3 is inside A center hole 6 having a diameter into which the twisted convex strip 5 is inserted is formed.

[0009] Since the tube material 2 and the helical gear 3 are constructed in this way, the twisted protrusion of the tube material 2 5 is formed into the center hole 6 of the helical gear 3, and The small diameter portion 4 is expanded by pressurizing the diameter of the portion 4 from the inside of the tube material 2 using the pressure expanding means. The twisted convex strip 5 is press-fitted into the inner circumferential surface of the center hole 6, and the tube material 2 and helical gear 3 are fixed. be done.

0010 Note that the pressurizing diameter expansion means involves pressurizing fluid into the pipe material 2 by applying bulge pressure, and increasing the flow rate. The diameter of the tube material 2 is expanded by the pressure of the body, and the twisted convex strips 5 formed on the outer circumferential surface of the tube material 2 are expanded. A method of press-fitting and fixing into the inner peripheral surface of the center hole 6 of the helical gear 3, or a method of fixing it to the inner peripheral surface of the center hole 6 of the helical gear 3, or An expansion rod having a diameter slightly larger than the inner diameter of the small diameter part 4 is inserted from the end on the large diameter part 7 side of 2. A method in which the diameter of the small diameter portion 4 is expanded by press fitting, and the twisted convex strip 5 is press fitted into the center hole 6 and fixed. This can be done by law etc.

[0011] The shaft 1 with a helical gear formed in this way is shown in FIG. Even if the axial thrust Pa due to the tangential force P of the gear 3 acts, this axial thrust Pa will be The helical gear 3 is received by the twisted protrusion 5 so that it does not become looser than the tube material 2.

0012 In this example, twisted convex stripes were formed on the outer circumferential surface of the pipe material. A twisted protrusion is formed on the inner circumferential surface of the center hole of the gear, and the pipe material is attached to the twisted protrusion. The diameter may be expanded and fixed under pressure, but the invention is not limited to this. stop The twisted protrusions may be provided on either side of the material having the greater hardness.

[0013]

[Effect of the idea]

As explained above, the present invention applies to A twisted protrusion having the same direction as the helical gear's helical angle is formed on either side. Since the helical gear is fixed to the pipe material through this twisted protrusion, the helical gear The axial thrust acting on the tooth surface of the gear is absorbed by the twisted protrusions, resulting in a strong force. A firm bond is obtained, so there is no loosening between the helical gear and the pipe material. Therefore, there is no need for a rotation stopper, etc., and an inexpensive shaft with a helical gear can be obtained. play.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of a shaft with a helical gear according to the present invention.

FIG. 2 is a vertical cross-sectional view of a shaft with a helical gear.

FIG. 3 is a perspective view of a tube material in which twisted protrusions are formed on the small diameter portion.

FIG. 4 is a perspective view of a helical gear.

FIG. 5 is an explanatory diagram of the force acting on the helical gear and the twisted protrusions.

[Explanation of symbols]

1 Shaft with helical gear 2 Piping material 3 Helical gear 4 Small diameter section 5 Twisted ridges 6 Center hole

Claims (1)

[Scope of utility model registration request] Claim 1: A tube material is inserted into a center hole of a helical gear, and the inner circumferential surface of this tube material is expanded under pressure to integrate the helical gear into the tube material, wherein the outer circumferential surface of the tube material or A twisted protrusion having the same direction as the helical angle of the helical gear is formed on either one of the inner circumferential surfaces of the center hole of the helical gear, and the helical gear is attached to the pipe material through this twisted protrusion. A shaft with a helical gear that is fixed.