JPH026292Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a spur gear used in general machinery, etc., and particularly to a spur gear that can be easily attached to and detached from a shaft.

Prior Art Conventionally, spur gears used in various machine tools, looms, etc. sometimes have to be replaced due to processing reasons or damage. Since it needs to be removed, it takes time to attach and detach, and there are problems such as having to center it again when it is attached.

From this point of view, sprocket wheels are split in half and then assembled into one piece. However, once split, it becomes difficult to achieve accuracy, and once assembled, dowel pins, etc. are used for positioning. It is also possible to drive the gear into the gear, but with this method it is difficult to remove the gear once it has been assembled, and it takes a lot of time.

Purpose of the invention The purpose of this invention is to provide a segmented spur gear that does not have the above-mentioned problems.It is designed to be easily attached and detached without removing the shaft, and without compromising installation accuracy. be.

Structure of the invention The split spur gear according to this invention is a split spur gear in which two separated left and right split gears are bolted together by a connecting member and connected integrally at their mating surfaces, and the left and right split gears are integrally connected at their mating surfaces. The split gear has a shaft hole in the center and a fully geared spur gear is placed between the shaft hole and at two positions on the center line passing through the bottom of the tooth, which serve as positioning recesses for the mating surface. Drill a positioning hole,
Thereafter, the left and right gears are cut along the center line to form the left and right gears, and when the left and right split gears are connected, positioning pins having an outer diameter equal to the inner diameter of the positioning hole are positioned at the mating surfaces of the left and right split gears. It is characterized in that it is connected by the connecting member in close contact with the inner peripheral surface of the recess.

Embodiments This invention will be explained below with reference to illustrated embodiments.

In FIG. 1, reference numeral 1 denotes a spur gear with completed gear cutting, and the disc-shaped portion 2 of the spur gear 1 has positioning holes 5, 5 centered on the central axis A-A passing through the corresponding tooth bottoms 3, 4. are drilled symmetrically about the center,
Furthermore, bolt holes 6, 6, 7, and 7 are drilled symmetrically on the left and right sides of the disc-shaped portion around the central axis A-A,
8 is a central shaft hole, and 9 is a tooth.

FIGS. 2 and 3 show the spur gear 1 cut into two split gears 1a,
1b shows the state in which the divided gears 1a and 1b are placed in the original state of the spur gear 1. A gap S is formed. Further, at both ends of the mating surfaces 10 and 11, divided tooth bottoms 3a and 3b, which are formed by dividing and cutting the tooth bottoms 3 and 4, are provided.
4a and 4b are formed respectively, and furthermore, positioning recesses 5a and 4b are formed by the positioning hole 5 and the shaft hole 8, respectively.
5b, and shaft recesses 8a, 8b are formed to face each other. 12 is a positioning pin located between the positioning recesses 5a and 5b of the divided gears 1a and 1b, and the positioning pin 12 has an outer diameter equal to the inner diameter of the positioning hole 5 and
a, 1b When assembling each positioning recess 5a, 5b
The surface of the positioning pin 12 and the curved surfaces of the positioning recesses 5a, 5b are in close contact with each other, and the two split gears 1a, 1b are centered, and the outer shape formed by them is is made to be the same as the outer shape of the original spur gear 1, and a gap S similar to that described above is formed between the respective mating surfaces 10 and 11.

4 and 5, reference numeral 13 denotes a fan-shaped plate-shaped connecting member located between the split gears 1a and 1b in FIG. 2, and between the bolt holes 6 and 6 or between the bolt holes 7 and 7. Bolt holes 14, 14 are drilled at corresponding intervals. Also, Figures 6 and 7
In the figure, reference numeral 15 denotes a gear holder for attaching the assembly of split gears 1a and 1b to the shaft, and the gear holder 15 has screw holes 16 at the same relative positions with respect to the center corresponding to the bolt holes 6, 6, 7, and 7. ,16,
17, 17 are provided, 18 is a shaft hole, and 19 is a threaded portion for a set screw 21 to be described later.

8 and 9 show the split spur gear assembled from the above-mentioned parts and attached to a predetermined shaft 20. The gear holder 15 is attached to the shaft 20 in advance.
are fitted and fixed with setscrews 21, and the split gears 1a, 1b are inserted into their respective shaft recesses 8a, 8b.
sandwich and position the shaft 20 with the mating surfaces 10 and 1.
1 to face each other, and each positioning recess 5
The positioning pins 12, 12 are interposed between the positioning recesses 5a, 5b, and the split gears 1a, 1b are brought close together until the curved surfaces of the positioning recesses 5a, 5b and the outer surfaces of the positioning pins 12, 12 are brought into close contact. , 13 are positioned between the two split gears 1a, 1b in a direction perpendicular to the mating surfaces 10, 11, and the bolt holes 14, 6 and bolt holes 1
Match bolts 4 and 7 and tighten each bolt 22.
Then, when each tightening bolt 22 is screwed into each threaded hole 16, 17 of the gear holder 15, the split gears 1a, 1b become an integral body concentric with the shaft 20, and are fixed to the gear holder 15, and their The outer shape is the same as that of the spur gear 1, forming a predetermined gear.

Function The split spur gear with the above configuration is meshed with a spur gear (not shown) and transmits rotation to other shafts by rotation of the shaft 20, but the rotation ratio may be changed or damaged due to processing reasons. If replacement is required, first remove each tightening bolt 22, remove the connecting members 13, 13, and separate the split gears 1a, 1b left and right and remove them from the shaft 20. Next, another required divided gear divided in the same manner as described above is attached to the gear holder 15 by the same procedure.
When the split spur gear is fixed to the split spur gear, the assembled split spur gear is concentric with the above and has a predetermined external shape, meshes with the mating spur gear, and can be used immediately.

Effects of the invention As is clear from the above explanation, according to this invention, the gears can be attached and detached while the shaft remains fixed, the attachment and detachment operations are easy and can be completed in a short time, and the gears can be separated. Because the center line passes through the corresponding tooth bottom, each tooth profile remains in its perfect shape and there is no problem in meshing.Furthermore, both split gears are automatically assembled and assembled using positioning pins. This is very convenient because they are aligned, and even when removed, the positioning pin is simply placed in a clamped manner between the two split gears, so they can be easily separated.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention. Fig. 1 is a front view of the spur gear before division, and Fig. 2 shows the spur gear in Fig. 1 divided along the center line A-A and then separated by positioning pins. Front view of split gear arranged in assembled state,
Figure 3 is a side view of the split gear taken along the - line in Figure 2, Figure 4 is a front view of the connecting member, Figure 5 is a side view, Figure 6 is a front view of the gear holder, and Figure 7 is the same line. FIG. 8 is a partially cutaway front view of the split spur gear in an assembled state, and FIG. 9 is a partially cutaway side view taken along the - line in FIG. 8. 1...Spur gear, 1a, 1b...Divided gear, 3,
4...Tooth bottom, 5a, 5b...Positioning recess, 1
0,11...Mating surface, 12...Positioning pin, 1
3...Connection member.

Claims (1)

[Scope of Claim for Utility Model Registration] A split spur gear formed by two separated left and right split gears bolted together by a connecting member and integrally connected at mutual mating surfaces, wherein the left and right split gears are A spur gear with a shaft hole in the center and which has been completely gear-cut is drilled with positioning holes that will serve as positioning recesses for the mating surface at two positions on a center line that passes through the shaft hole and the bottom of the tooth. established,
Thereafter, the left and right gears are cut along the center line to form the left and right gears, and when the left and right split gears are connected, positioning pins having an outer diameter equal to the inner diameter of the positioning hole are positioned at the mating surfaces of the left and right split gears. A split spur gear, characterized in that the split spur gear is connected by the connecting member in close contact with the inner circumferential surface of the recess.