JPH039952Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention belongs to the field of tightening mechanical parts, and is mainly used as a centering jig for various gears provided as machine elements.

(Prior art) Conventionally, the various gears mentioned above have boss parts etc. machined according to their own design specifications, and during the machining, centering is done based on the outer diameter, but the meshing of the gears is a tight circle. As a result, the conventional machining method has a defect in that the axis to be machined and the center of the pitch circle are misaligned, resulting in uneven transmission.

(Problems to be solved by the invention) In order to solve the defects of the above-mentioned prior art, the invention
The gear to be processed (hereinafter referred to as the processing gear)
The technical problem is to provide a centering jig that can perform centering based on the pitch circle of .

(Means for solving the problem) The present invention has a fixed shaft protruding from the center of one side of the disk,
A worm gear is rotatably fitted onto the fixed shaft, a worm is pivotally supported at the end of one side of the disk and engages with the worm gear, and a worm gear is fitted on the other side of the worm gear.
A spiral groove having the same predetermined curve as an outline is dug in the divided phase, and one end of a guide shaft inserted through a long groove penetrating the disk is slidably engaged in the spiral groove, and the edge of the disk surface is slidably engaged. Guided at an equal distance from the center, the middle part of the guide shaft is slidably locked toward the center of the disk on the other side of the disk, and the master gear is rotatably engaged with the other end of the guide shaft. On one side of each master gear, a ring plate with an outer diameter larger than that of the gear is protruded, and on the other side of the disk, roughly L-shaped stators are bolted at three equal locations on their long sides. It is locked so that it can be pressed and released. Here, examples of the spiral groove include an Archimedes spiral.

(Function) According to the above configuration, the axis of each master gear can be lengthened or shortened at equal distances from the center of the fixed shaft.

(Example) To explain the present invention in detail with reference to an example, as shown in FIG.
A worm gear 3 is rotatably fitted onto the fixed shaft 2, and a worm 4 is provided at the lower part of one side of the disk 1.
is pivotally supported and meshed with the worm gear 3, one side plate surface of the worm gear 3 is covered with a hollow disk 5 and connected to the disk 1, and the other side plate surface of the worm gear 3 is connected to the worm gear 3.
Digging a spiral groove 6 (a spiral groove that gives uniform linear motion toward the center like an Archimedean spiral) having the same predetermined curve as an outline in the divided phases,
A cam follower 7 is slidably engaged with the spiral groove 6, and the cam follower 7 is rotatably engaged with the tip of a guide shaft 9 inserted through a long groove 8 provided through the disk 1. The upper part of the guide shaft 9 is guided at an equal distance from the center of the disk surface, and has a trapezoidal cross section as a piece 10, which is integral with the other side of the disk 1.
A guide shaft 12 is integrated coaxially with the upper surface (other side surface) of the piece 10, and a master gear 14 is exchangeably engaged with the guide shaft 12 via a bearing 13. A ring plate 15 having an outer diameter larger than that of the gear 14 is integrally formed on one side of each master gear 14, and substantially L-shaped stators 16 are installed at three equal locations on the other side of the disk 1. It is locked on its long side with a bolt so that it can be pressed and released.

According to the above configuration, each master gear 14
are selected so that the modules of the processing gear 17 are equal, and since the axis of the master gear 14 can be lengthened or shortened at equal distances from the center of the fixed shaft 2, the ring plate 15 protruding from one side of the master gear 14
When the worm gear 3 is rotated by gradually rotating the worm 4, the three master gears 14 simultaneously move the machining gear 17 at the same pitch circle from the center of the fixed shaft 2.
The machining gear 17 is clamped by a substantially L-shaped stator 16, and the fixed shaft 2 is locked to the chuck of a lathe, so that the machining gear 17 aligns the machining axis with the center of the pitch circle. Then, the boss portion etc. are processed.

(Effect of the invention) As described above, according to the centering jig a of the invention,
The machining gear 17 is a master gear 1 whose axis is located equidistantly from the center of the fixed shaft 2 in its pitch circle.
By holding with the pitch circle of No. 4, accurate centering can be performed with a simple operation, and it is possible to provide a precision machined gear 17 in which the machining axis and the center of the pitch circle coincide.

[Brief explanation of the drawing]

Fig. 1 is a side view of a main part of the centering jig a according to the present invention cut away, Fig. 2 is a view taken in the direction of the P arrow in Fig. 1, and Fig. 3 is a view taken in the direction of the Q arrow in Fig. 2. . In the figure, 1 is a disk, 2 is a fixed shaft, 3 is a worm gear, 4 is a worm, 5 is a hollow disk, 6 is a spiral groove,
7 is a cam follower, 8 is a long groove, 9 and 12 are guide shafts, 10 is a piece, 11 is a dovetail groove, 13 is a bearing, 1
4 is a master gear, 15 is a wheel plate, 16 is a stator,
17 is a processing gear, and a is a centering jig.

Claims (1)

[Scope of utility model registration request] A fixed shaft is provided protruding from the center of one side of the disc, a worm gear is rotatably fitted onto the fixed shaft, a worm is pivotally supported at the end of one side of the disc, and engages with the worm gear, and the worm gear is attached to the other side of the disc. A spiral groove having the same predetermined curve as an outline is dug in the phase divided into three parts, and one end of a guide shaft inserted through a long groove penetrating the disk is slidably engaged in the spiral groove. The guide shaft is guided at an equal distance from the center of the disk surface, and the middle part of the guide shaft is slidably locked toward the center of the disk on the other side of the disk, and the master gear is rotatably attached to and detached from the other end of the guide shaft. A wheel plate whose outer diameter is larger than the outer diameter of the gear is protruded from one side of each master gear, and approximately L-shaped stators are installed at three equal locations on the other side of the disk. A centering jig that is secured on the long side with a bolt so that it can be pressed and released.