KR200195467Y1 - Gear transmittion apparatus for industrial machinery - Google Patents

Abstract

The present invention relates to a gear transmission for industrial machinery used in mixers, kneading dough for confectionery and baking, which rotates by receiving power from a motor as a power source, and is provided on a shift lever installed to protrude to one side of the gear box. The gear shaft is configured to be shifted by the input shaft, the input shaft being rotatably supported by the gear box and having a connection member condensed to receive power from the motor; A drive gear in which an orbital bearing is embedded in an open state toward the inner side of the gear box and formed integrally with the input shaft; Internal toothed splines formed in the center of the interlocking gear meshed with one side of the drive gear and external toothed splines penetrating in a meshed state are formed, and both ends are interlocked spline shafts freely rotatable with support bearings attached to the gearbox. ; A first stage interlocking gear formed integrally with the interlocking gear and installed on the interlocking spline shaft; Located on the interlocking spline shaft on the opposite side facing the interlocking gear and the first-speed interlocking gear, the second-speed interlocking gear and the third-speed interlocking gear are spaced apart at regular intervals with the internal tooth spline formed to engage with the external tooth spline of the interlocking gear. An interlock transmission gear body that is integrally formed; One end is supported to rotate separately from the drive gear in the state of being inserted into the idle bearing of the drive gear, the other end is protruded toward the power transmission unit while the rotation is freely installed in the support bearing attached to the gear box. A drive spline shaft in which a transmission output shaft is integrally formed; The first stage drive gear is slidably engaged to the spline formed on the outer circumferential surface of the driving spline shaft, and is engaged with and separated from the first stage interlocking gear in the order of the position furthest from the position closest to the driving gear side; A two-speed drive gear meshed with and separated from the gear, and a three-speed drive gear meshed with and separated from the three-speed interlocking gear; A four-stage drive gear formed in an inner tooth shape at the center of the first-stage drive gear side of the drive transmission gear body and engaged with the drive gear; Slidably installed on the guide shaft fixed in the same axial direction while being positioned at the same height as the drive spline shaft, the drive transmission gear body is inserted into the circular groove formed on the outer circumferential surface of the drive transmission gear body to the left A gear shifting bundle having an arc-shaped operation section for moving to the right; It is fixed to the outer end side of the rotating shaft rotatably attached to one side wall of the gear box by a support bearing, and the operating rotary body to set the gear shift position in accordance with the number of gears indicated on the gear shift indicator attached to the gear box outer surface; ; And an actuating gear which is squeezed to the inner end side of the rotating shaft and is engaged with the rack gear formed on the gear shifting block to move the gear shifting unit left and right.

Description

Gear transmission apparatus for industrial machinery

The present invention relates to a gear transmission for industrial machinery used in a mixer mechanism for kneading confectionery and baking.

In general, the confectionery and bakery industry kneads a large amount of flour and uses a mixer mechanism that rotates the flour dough by power without resorting to manpower. Beyond that, the rotation speed can be changed.

BACKGROUND OF THE INVENTION [0002] The gear transmission used in the mixer mechanism of the prior art is used by modifying the gear transmission normally mounted on a rear wheel drive vehicle.

Since the gear transmission of the car is expensive to produce, the new gear transmission cannot be mounted on the mixer mechanism, so it is necessary to modify the gear transmission of the junk removed from used or scrapped cars which can be purchased at a very low price. In recent years, more front-wheel drive cars are being produced than rear-wheel drive cars.

Therefore, there are many difficulties to secure the second-hand gear transmission mounted on the rear wheel drive car.

In addition, since the gear transmission of the rear wheel drive car is very complicated in structure, it requires a lot of manpower and time to be modified to be driven by the power of an electric motor. It has been pointed out that it takes a lot of time and effort to do so.

The present invention has been made in view of the above-mentioned problems in the prior art, and has a simple structure compared to the gear transmission mounted on a rear wheel drive car and has a gear transmission capable of shifting gears from 1 to 4 gears. In addition, the structure of the gear transmission is simple, so even an inexperienced user can easily assemble the gear arrangement structure while reducing the assembly time and reduce the processing cost of the gear transmission. Another purpose is to make it possible to supply to the consumer at relatively low production cost, and to make it easier to identify the failure part when a failure occurs, and also to quickly replace parts such as failure parts. It was designed for a purpose.

The present invention as a means for achieving the above object,

In that the gear is rotated by receiving power from the motor as a power source, and is configured to be gear shifted by a shift lever installed to protrude to an outer side of the gear box.

An input shaft which is rotatably supported on one side of the gear box and is coupled to a connection member receiving power from the motor;

A drive gear formed integrally with the input shaft and installed inside the gear box, and having a ball bearing dedicated therein;

Internal toothed spline formed in the center of the interlocking gear meshed with one side of the drive gear and an external toothed spline penetrating in a meshed state are formed, and both ends are interlocked spline shafts which are freely rotated by support bearings attached to the gear box. and;

A first stage interlocking gear formed integrally with the interlocking gear and installed on the interlocking spline shaft;

Located on the interlocking spline shaft on the opposite side facing the interlocking gear and the first-speed interlocking gear, the second-speed interlocking gear and the third-speed interlocking gear are spaced apart at regular intervals with the internal tooth spline formed to engage with the external tooth spline of the interlocking gear. An interlock transmission gear body that is integrally formed;

One end is supported to rotate separately from the drive gear in the state of being inserted into the idle bearing of the drive gear, the other end is protruded toward the power transmission unit while the rotation is freely installed in the support bearing attached to the gear box. A drive spline shaft in which a transmission output shaft is integrally formed;

The first stage drive gear is slidably engaged to the spline formed on the outer circumferential surface of the driving spline shaft, and is engaged with and separated from the first stage interlocking gear in the order of the position furthest from the position closest to the driving gear side; A two-speed drive gear meshed with and separated from the gear, and a three-speed drive gear meshed with and separated from the three-speed interlocking gear;

A four-stage drive gear formed in an inner tooth shape at the center of the first-stage drive gear side of the drive transmission gear body and engaged with the drive gear;

Slidably installed on the guide shaft fixed in the same axial direction while being positioned at the same height as the drive spline shaft, the drive transmission gear body is inserted into the circular groove formed on the outer circumferential surface of the drive transmission gear body to the left A gear shifting bundle having an arc-shaped operation section for moving to the right;

It is fixed to the outer end side of the rotating shaft rotatably attached to one side wall of the gear box by a support bearing, and the operating rotary body to set the gear shift position in accordance with the number of gears indicated on the gear shift indicator attached to the gear box outer surface; ; And

An actuating gear on the inner end side of the rotating shaft and engaged with the gear gear formed on the gear shifting unit to move the gear shifting unit left and right;

It is characterized by consisting of

In addition, one end of each of the input shaft, the driving spline shaft, and the interlocking spline shaft is characterized in that the female screw portion to facilitate the separation of the shaft,

In addition, while forming a gear on each of the upper and lower surfaces of the gear shift, the arc-shaped movement is characterized in that it is configured to protrude in a position biased to one side.

1 is a state of use of one embodiment of the present invention applied to the mixer mechanism.

2 to 6 is a cross-sectional view of the operating state of the gear transmission which is the main part of the present invention,

2 is a gear shifted to the first stage,

3 is a state in which the gear is shifted in two stages,

Figure 4 is a gear shifted to three stages,

5 is a state in which the gear is shifted to four gears,

6 is a state in which the gear is shifted to neutral.

7 is a cross-sectional view taken along the line A-A of FIG.

Figure 8 is a plan view of the gear transmission which is the main part of the present invention.

9 is a cross-sectional view taken along the line B-B in FIG.

※ Explanation of code for main part of drawing

1: gearbox 2: input shaft

3: drive spline shaft 4: drive transmission gear body

5: Interlocking Spline Shaft 6: Gear Shifting Bundle

7: rotating shaft 11: motor

21,25,26,27: support bearing 22: connecting member

23: drive gear 24: bearing for idle

28, 32, 57: female thread part 31: shift output shaft

41: 1st stage drive gear 42: 2nd stage drive gear

43: three-speed drive gear 44: four-speed drive gear

45: circular groove 51: interlocking gear

52: 1-speed interlocking gear 53: Interlocking gear body

54: 2nd gear interlocking gear 55: 4th gear interlocking gear

56: spacing 61: guide shaft

62: Recreational Gear 63: Arc-Type Operation

71: operating gear 72: operating rotating body

73: manual lever 74: shift indication scale

75: gear shift indication board

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a state of use of one embodiment applying the present invention to the mixer mechanism, Figures 2 to 6 is a cross-sectional view of the operating state of the gear shifting gear shifting from the first stage to the fourth stage and the neutral state, which is the main part of the present invention. FIG. 7 is a sectional view taken along the line AA of FIG. 2, and FIG. 8 is a plan configuration diagram of the gear transmission which is the main part of the present invention, and FIG. 9 is a sectional view taken along the line BB of FIG.

Reference numeral 1 denotes a gear box, in which the input shaft 2 receiving power from the motor 11, which is a power source, is rotatably supported by the support bearing 21 on the rear wall of the gear box 1. It is installed.

On the outer end side of the input shaft 2 protruding to the outside of the gear box 1, a connection member 22 receiving power from the motor 11 is condensed, and the connection member 22 is an output shaft of the motor 11. It can be selected as a pulley or chain gear depending on the power train condensed on the

For example, when the power transmission body condensed to the output shaft of the motor 11 is a pulley, the connection member 22 is a pulley connected by a belt, and when the power transmission body is a chain gear, the connection member 22. Is the chain gear connected to the chain.

A drive gear 23 is formed at an inner end side of the input shaft 2 protruding into the gear box 1, and the drive gear 23 is preferably processed to be integrally formed with the input shaft 2.

In the center of the drive gear 23 is formed a cylindrical groove which is open inward, the ball bearing 24 is forcibly fitted into the cylindrical groove.

One end of the drive spline shaft 3 installed inside the gearbox 1 so that the center line of the input shaft 2 coincides with the center shaft is inserted into the idle bearing 24 of the drive gear 23 so as to be supported at idle. On the other end, the power transmission unit in a state in which rotation is freely supported by the support bearing 25 on a wall surface defining the power transmission unit 12 formed in an extended state on one side of the gear box 1. 12) The shift output shaft 31 is formed integrally extending to protrude toward the inside, the outer peripheral surface of the drive spline shaft 3 has a spline structure with a wide pitch interval, the outer peripheral surface of the shift output shaft 31 is pitch Splined structure with narrow spacing.

In the drive transmission gear body 4 which is slidably engaged with the spline outer circumferential surface of the drive spline shaft 3, the drive gear 41 having the largest outer diameter from the first stage drive gear 41 having the largest outer diameter is 2 to 2. The stage drive gear 42 and the third stage drive 43 are sequentially formed at positions spaced apart at predetermined intervals, and an inner tooth type that is engaged with the drive gear 23 on the central side of the first stage drive gear 41. Four-stage drive gear 44 is formed.

A circular groove 45 is formed between the first stage and second stage drive gears 41 and 42 of the drive transmission gear body 4.

On the other hand, both ends of the interlocking spline shaft 5 in which the interlocking gears meshing with each of the first to third gears formed in the drive transmission gear body 4 are installed in the gearbox 1. (27) is rotatably installed, and the outer peripheral surface of the interlocking spline shaft (5) has a narrow spline structure.

On one side of the interlocking spline shaft 5, an interlocking gear 51 meshed with the drive gear 23 is fixedly installed, and the interlocking gear 51 has a first stage interlocking gear 52 having the smallest outer diameter. It is formed integrally spaced apart at intervals, and on the other side, the interlock transmission gear body 53 is installed, the second gear link gear 54 and the third gear link gear 55 is provided on the interlock gear shift body 53. It is formed to be spaced apart at set intervals.

The first stage interlocking gear 52 integrally formed with the interlocking gear 51 and the second interlocking gear 54 of the interlocking wall gear body 53 are engaged with the spline formed on the outer circumferential surface of the interlocking spline shaft 5. A spacing holder 56 having an internal tooth type spline formed therein is installed so that the interlocking gear 51, the first stage interlocking gear 52, the second stage interlocking gear 54, and the third stage interlocking gear 55 are located at a predetermined position. It is configured to rotate in a fixed state.

In addition, the gear transmission bundle 6 is slidably installed horizontally in the guide shaft 61 fixedly installed in parallel with the drive spline shaft 3 in the gear box 1. Recreational gears 62 are formed on each of the upper and lower surfaces of the transmission bundle 6, and one surface of the gear transmission bundle 6 includes a circular groove 45 formed on the outer circumferential surface of the drive transmission gear body 4; Slidingly inserted is formed arc-shaped operating period 63 for moving the drive transmission gear body 4 to the left, right sides, the arc-shaped operating interval 63 is not in the center of the gear shift bundle (6) It is formed to protrude from a position biased to one side.

Recreational gear 62 formed on the lower surface of the gear shift bundle 6 is rotatably installed on one side wall of the gear box (1) is affixed to the inner end side of the rotary shaft (7) protruding into the gear box (1) It is to be meshed with the operating gear 71, the operating rotary body 72 is condensed to the outer end side of the rotary shaft 7, the manual lever 73 is attached to the operating rotary body 72, the rotary shaft 7 is manually It is configured to operate rotation.

A shift indication scale 74 indicating a gear shift position is displayed on one side of the outer circumferential surface of the operating rotating body 72, and a gear is provided on the outer surface of the gear box 1 in which the operating rotating body 72 is installed. Gear shifting indicator 75 is attached to check the shift state, that is, whether the gear is shifted from the first gear to the fourth gear and neutral.

Both ends of the first to third stage drive gears formed on the outer periphery of the drive transmission gear body 4 and the first and second stage interlocking gears installed on the interlocking spline 5 are rounded at the ends in an inclined state. It is formed in the shape, the drive gear 23 and the internal gear type four-stage drive gears 44 are formed in a rounded triangular shape inclined only one end facing each other, and in the case of the three-stage interlocking gear 55 It is formed in a rounded triangular shape with only one end inclined toward the inside of the gear box 1. Thus, both ends or one end of each drive and interlocking gear are inclined and rounded in a triangle shape. The driving and interlocking gears to be engaged can be smoothly coupled and separated even in a rotating state, and also to be able to pass quickly.

On the other hand, in the configuration of the embodiment, the configuration in which the protruding position of the arc-shaped operation section 63 of the gear shift bundle 6 to one side is biased to one side for the following reasons.

That is, when the first stage drive gear 41 of the drive transmission gear body 4 is engaged with the first stage interlocking gear 52, the internal gear type four stage drive gear 44 is the drive gear 23. Although the distance to be meshed with is short, the distance with which the three-stage drive gear 43 is meshed with the three-stage interlocking gear 55 is formed long. Therefore, even when the circular groove 45 formed on the outer circumferential surface of the drive transmission gear body 4 is formed at the center position adjacent to the second stage drive gear 42, when the drive transmission gear body 4 is shifted to four steps. Since the distance is short and the distance at the time of shifting to three gears becomes long, the arc-shaped operation period 63 is formed in a state biased toward the drive gear 23 side.

In addition, the reason why the gear gear 62 is formed on both the upper and lower surfaces of the gear shifting bundle 4 is that even if the installation position of the operating gear 71 is changed in the state where the arc-shaped operation section 63 is biased to one side. This is to allow the shifting operation from the first gear to the fourth gear of the drive transmission gear body 4.

One end of each of the input shaft 2, the drive spline shaft 3, and the interlocking spline shaft 5 is provided with female threads 28, 32, 57 for easy disassembly.

The gear shifting device of the present invention having the above configuration is designed to use the rotational output of the shifting output shaft 31 projecting to the opposite position of the input shaft 2, and the present invention is applied to the mixer mechanism as an embodiment. The transmission gear shaft (8) is fixed to the transmission output shaft (31) protruding inward of the power transmission portion (11) formed on one side of the gear box (1), and the transmission output shaft (31). The kneading member 92 attached to the lower end of the vertical rotation shaft (9) as a structure for fixing the rotary gear (91) meshing with the power transmission gear (8) installed perpendicular to the vertical rotation shaft (9). It is to knead flour by shifting from 1 to 4 gears.

The operation of the present invention configured as described above will be described.

First, when the drive gears of the stages formed in the drive transmission gear body 4 are operated in a neutral state, when the motor 11, which is the power source, is driven, the rotational power of the motor 11 is connected to the connection member 22. The input shaft 2 is rotated, and when the rotary shaft input shaft 2 is rotated in this way, the drive gear 23 formed at the inner end side of the input shaft 2 also rotates together, wherein only the idle rotation of the drive gear 23 is performed. The drive spline shaft 3, which is supported in the state of being inserted into the bearing 24, is stopped because it does not receive the rotational force, while the interlocking gear 51 engaged with the drive gear 23 transmits the rotational force. Since the interlocking gear 51 and the interlocking spline shaft 5 and the first to third interlocking gears 52, 54 and 55 are rotated together at the same speed.

Manual operation of the operating rotary body 72 protruding on one side of the gear box 1 in a state in which the first to third stage interlocking gears installed on the driving gear 23 and the interlocking spline shaft 5 are rotating as described above. Holding the lever 73 and rotating operation so that the shift indication scale 74 is matched to the first position of the gear shift indicating plate 75, the rotating shaft 7 and the operating gear 71 rotate, and the operating gear In accordance with the rotation operation of the 71, the gear shift bundle 6 in which the gear gear 62 is formed is moved horizontally in the direction of rotation of the operation gear 71 by the guide shaft 61 and the drive spline shaft at the same time. The drive transmission gear body 4 slidably installed at (3) is moved so that the first stage drive gear 41 is engaged with the rotating first stage interlocking gear 52, and the other two to four stages. Drive and interlocking gears are in a separated state, and thus the first stage drive gear 41 is connected to the first stage. When the gear 52 is engaged with the gear 52, the drive transmission gear body 4 and the drive spline shaft 3 rotate at the same rotation speed, and thus the transmission output shaft 31 integrally formed with the drive spline shaft 3 is It is to transmit the rotational force at the speed gear shifted to the first stage (see Fig. 2).

When the gear is shifted to the second gear in the state in which the gear is shifted to the first gear as described above, the manual gear lever 73 of the operating rotating body 72 is held, and the shift indication scale 74 is marked on the gear shift indicator 75. When the rotational operation is made to coincide with the two-stage display position, the gear shifting unit 6 moves the drive transmission gear body 4 to the two-speed gear shifting position. The gear 41 is separated from the first stage interlocking gear 52 and the second stage drive gear 42 is meshed with the second stage interlocking gear 54 (see FIG. 3). Even when shifting is performed, when the shift indication scale 74 displayed on the outer circumferential surface of the operating rotating body 72 is rotated to coincide with the three-step display position of the gear shift indicating plate 75, the two-stage drive gear 42 Is separated from the two-stage interlocking gear 54 and the three-stage drive gear 43 is coupled to the three-stage interlocking gear 55. (See FIG. 4), the manual shift so that the shift indication scale 74 coincides with the four-step display position of the gear shift indicator 75 is also performed when the gear is shifted to the fourth gear while the gear is shifted to the third gear. When the operating rotary body 72 is rotated by holding the lever 73, the three-stage drive gear 43 is separated from the three-stage interlocking gear 55, and the drive transmission gear body 4 moves toward the driving gear 23. The internal gear type four-stage drive gear 44 is coupled to the drive gear 23 (see FIG. 5). In this case, the two-stage drive gear is shifted to four-stage gears in the three-stage gear shift state. (42) and the first stage drive gear 41 passes through the second stage interlocking gear 54 and the second stage interlocking gear 52, wherein the drive transmission gear body 4 is gear shifted to the third stage in advance. The gear shifting operation from the 3rd to the 4th stage is performed because it moves and passes in the state of rotation by the rotational inertia force when rotating It will be made smoothly.

When the gear shift is selected from the first gear to the fourth gear as described above, and the gear shift output shaft 31 is to be stopped in the process of transmitting the shifted rotation output through the shift output shaft 31, the operation rotary body 72 ) When the shift display scale 74 displayed on one side is matched to the neutral position N respectively displayed between the step display positions of the gear shift indicator 75, the respective drive gears are separated from the respective interlocking gears. Since the rotational power transmitted to the input shaft 2 is transmitted only to the interlocking spline shaft 5 and not to the driving spline shaft 3, the motor 11 is shifted to the first to fourth gears. Only the shift output shaft 31 can be temporarily stopped without stopping).

On the other hand, when using a gear transmission configured as described above when a failure occurs, or when the first to fourth gears and interlocking gears are worn out and want to replace them, put a jig on one side of the gearbox (1) to the jig Since the above-mentioned disassembly tool draws the input shaft 2 by screwing the male screw of the disassembly tool (not shown) which is held in a fixed state to the female screw portion 28 formed at one end of the input shaft 2. Since the drive gear 23 integrally formed at the inner end side of the input shaft 2 is in a state of pushing the support bearing 21, the input shaft 2 can be easily disassembled, and the input shaft 2 is disassembled. Next, when the male screw of the disassembly tool is screwed into the female screw part 32 formed at one end of the driving spline shaft 3 and pulled out, the support bearing 25 also comes out of the wall of the gear box 1, so that the driving spline shaft (3) can be easily disassembled, and the external thread of the interlocking spline shaft 5 can be easily assembled by screwing the male screw of the disassembling tool to the female screw portion 57 formed at one end of the interlocking spline shaft 5. Interlocking gear body 53 and interlocking gear 56 formed with interlocking gear 51 and first-stage interlocking gear 52 and two- and three-stage interlocking gears 54 and 55 engaged with the spline formed thereon; The dismantling is performed while the gearbox 1 remains intact while the interlocking spline shaft 5 is pulled out while pushing the support bearing 26 out.

In addition, after disassembling the input shaft (2), the drive spline shaft (3) and the interlocking spline shaft (5) as described above, each of the gear parts are replaced, the new gear parts are placed in the gearbox (1) in the assembly order. If you put each axis in order in the state in the state and each support bearing is assembled by interference type, the assembly work can be easily completed.

According to the present invention as described above, the one end of the drive spline shaft is connected to the ball bearing dedicated to the revolving bearing embedded in the drive gear integrally formed on the inner end side of the input shaft receiving the power of the motor to rotate the input shaft and the drive spline shaft respectively And a means for slidably configuring the drive transmission gear body in which the first to fourth stage drive gears are formed on the drive spline shaft, so that the structure of the gear transmission can be simplified, and the drive transmission gear The gear shifting operation is easy because the gear can be shifted by moving the body horizontally. In particular, the gear shifting device of the present invention has a simple structure, and even an inexperienced person can perform the assembly work while only knowing the assembly position of each part. Not only can it be easily disassembled, it is easy to replace parts. It is a practical design that provides an advantage such as.

Claims (3)

In that the gear is rotated by receiving power from the motor as a power source, and is configured to be gear shifted by a shift lever installed to protrude to an outer side of the gear box. An input shaft which is rotatably supported on one side of the gear box and is coupled to a connection member receiving power from the motor; A drive gear formed integrally with the input shaft and installed inside the gear box, and having a ball bearing dedicated therein; Internal toothed spline formed in the center of the interlocking gear meshed with one side of the drive gear and an external toothed spline penetrating in a meshed state are formed, and both ends are interlocked spline shafts which are freely rotated by support bearings attached to the gear box. and; A first stage interlocking gear formed integrally with the interlocking gear and installed on the interlocking spline shaft; Located on the interlocking spline shaft on the opposite side facing the interlocking gear and the first-speed interlocking gear, the second-speed interlocking gear and the third-speed interlocking gear are spaced at regular intervals with the internal tooth spline formed to engage with the external tooth spline of the interlocking shaft. An interlock transmission gear body that is integrally formed; One end is supported to rotate separately from the drive gear in the state of being inserted into the idle bearing of the drive gear, the other end is protruded toward the power transmission unit while the rotation is freely installed in the support bearing attached to the gear box. A drive spline shaft in which a transmission output shaft is integrally formed; The first stage drive gear is slidably engaged to the spline formed on the outer circumferential surface of the driving spline shaft, and is engaged with and separated from the first stage interlocking gear in the order of the position furthest from the position closest to the driving gear side; A two-speed drive gear meshed with and separated from the gear, and a three-speed drive gear meshed with and separated from the three-speed interlocking gear; A four-stage drive gear formed in an inner tooth shape at the center of the first-stage drive gear side of the drive transmission gear body and engaged with the drive gear; Slidably installed on the guide shaft fixed in the same axial direction while being positioned at the same height as the drive spline shaft, the drive transmission gear body is inserted into the circular groove formed on the outer circumferential surface of the drive transmission gear body to the left A gear shifting bundle having an arc-shaped operation section for moving to the right; It is fixed to the outer end side of the rotating shaft rotatably attached to one side wall of the gear box by a support bearing, and the operating rotary body to set the gear shift position in accordance with the number of gears indicated on the gear shift indicator attached to the gear box outer surface; ; And An actuating gear on the inner end side of the rotating shaft and engaged with the gear gear formed on the gear shifting unit to move the gear shifting unit left and right; Gear transmission for industrial machinery, characterized in that the configuration. The method of claim 1, And one end of each of the input shaft, the driving spline shaft, and the interlocking spline shaft to form a female screw portion for facilitating the separation of the shafts. The method of claim 1, The gear transmission device for the industrial machine tool, characterized in that to form a rack gear on each of the upper and lower surfaces of the gear transmission, the arc-shaped movement between the protruding from the position biased to one side.