CN201291333Y - Spiral bevel gear digital control lapping device - Google Patents

Abstract

The utility model discloses a numerical-control spiral bevel gear lapping machine. The machine comprises a lathe body, an upright post, a driving case, a driven case and a numerical-control system, wherein a driving guide rail and a driven guide rail are arranged on the lathe body; the upright post is arranged on the driving guide rail; an automatic moving mechanism is arranged between the bottom of the upright post and the lathe body; the driving case is laterally hung at the lateral surface of the upright post, and an automatic moving mechanism is arranged at the bottom of the driving case; the driven case is arranged on the driven guide rail of the lathe body, and an automatic moving mechanism is arranged between the bottom of the driven case and the lathe body; the driving case and the driven case are respectively provided with a driving main shaft and a driven main shaft, and the inner holes of the driving main shaft and the driven main shaft are respectively provided with a driving gear and a driven gear. The machine has the beneficial effects that the structure is compact, and the operator can access a workpiece to the utmost extent; the automatic gear recognition is realized and the installation distance and the lateral gap of the bevel gear pair are adjusted; by adopting the electrical main shaft technology, the zero transmission of the revolving of the two main shafts, thereby improving the speed, keeping the dynamic stability when in high speed, and improving the production efficiency.

Description

A CNC grinding machine for spiral bevel gears

technical field

The utility model relates to a bevel gear pair numerical control gear grinding machine, in particular to a spiral bevel gear numerical control gear grinding machine.

Background technique

The CNC spiral bevel gear grinding machine is used for high-speed and precise grinding of spiral bevel gears and hypoid gears. Its purpose is to correct the deformation of the gear heat treatment, improve the tooth surface finish, improve the position and size of the contact area, and achieve stable transmission. Reduce noise and improve carrying capacity. The processing method is to install a pair of bevel gears on the two corresponding main shafts of the gear grinding machine, and maintain a certain side clearance, and at the same time grind the large and small wheels in the axial direction and offset distance. ~50Nm braking torque, and add a certain flow rate and pressure of grinding fluid to the meshing point of the two wheels, and grind until the tooth surface turns white and the contact area meets the requirements.

The structure of the prior art bevel gear grinding machine tool mainly includes: bed, slide plate, small wheel headstock, large wheel headstock, hydraulic system and loading device, pneumatic device, grinding liquid supply device and electrical control part; The small wheel spindle box is vertically installed and fixed, and the spindle motor is used to drive the active spindle to rotate through the belt pulley. The big wheel spindle box is installed inside the big wheel box, and the servo motor installed on the adjustment slide plate on the side of the big wheel box drives the worm gear and the ball screw to make the screw move in a straight line to push the driven box to make the big gear required for grinding teeth. (that is, driven wheel) movement perpendicular to the axis direction of the pinion (ie, driving wheel), the axial movement of the pinion, and the axial movement of the large gear. The main wheel headstock is hung on the adjustment slide plate, and the manual screw pair makes the adjustment slide plate move vertically to adjust the installation distance of the driving wheel. Through the oil cylinder, the large wheel box and the driven box can move forward and backward together, and the hand wheel behind the large wheel box can be used to adjust the installation distance of the driven wheel. After the big wheel box advances in place, it is tightened with a disc spring. The loading method adopts a hydraulic motor to load through a proportional valve and a proportional amplifier.

The above-mentioned prior art spiral bevel gear grinding machine has the following defects: 1. The machine tool has a complex structure, many parts, difficult manufacturing and assembly, difficult adjustment, and prone to failure. 2. The gear installation distance is manually adjusted, and the error is large. 3. Belt drive, large and small wheel spindles have lost rotation, and the reaction torque is not accurate, which affects the processing quality 4. Low degree of automation and low efficiency. 5. High labor intensity.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the above-mentioned technologies, to provide a fully automatic 90° installation of various parameters of the spiral bevel gear pair, and to directly load the motor to the main shaft through electrical control, so as to maintain the dynamic stability during high-speed grinding. The position and size of the contact area can be controlled, the structure is simple and compact, the occupied area is small, and the efficiency is high.

The technical solution to solve the above technical problems is: a spiral bevel gear CNC gear grinding machine, the spiral bevel gear CNC gear grinding machine includes: bed, column, driving box, driven box, numerical control system; set on the bed There are active guide rails and driven guide rails at 90° to each other. The column is set on the active guide rail on the bed, and an automatic moving mechanism is set between the bottom of the column and the bed to move along the active guide rail; the side of the active box is hung on the column On the side, the bottom of the active box is provided with an automatic moving mechanism that can move vertically along the side of the column; The moving automatic movement mechanism; the driving box and the driven box are respectively provided with a driving main shaft and a driven main shaft placed vertically and horizontally, and the inner holes of the driving main shaft and the driven main shaft are respectively installed with the driving gear mandrel and the driven gear of the ground driving gear. The driven gear mandrel of the gear; the driving main shaft and the driven main shaft are respectively directly connected to and driven by the motors installed inside the driving box and the driven box.

The beneficial effects of the utility model are: the utility model realizes three mutual perpendicular directions by two numerical control axes installed on the bed at 90° to each other to realize the automatic movement mechanism in the horizontal direction and the automatic movement mechanism installed on the column to realize the vertical direction. The linear motion; the built-in motor installed in the main and driven boxes drives the main shaft to rotate to complete the installation distance of the spiral bevel gear pair with an angle of 90° to the shaft, the contact surface and the meshing and loading of the grinding motion gear pair. The utility model solves the problems of automatic tooth recognition, automatic meshing and adjustment of backlash, loading and torque display, automatic detection and compensation of movement according to the set program in the bevel gear grinding process, and becomes the final sequence of bevel gear secondary processing. The specific advantages are:

1. The machine tool has a compact structure and a small footprint, allowing the operator to get close to the workpiece as much as possible.

2. It can automatically recognize the teeth and adjust the installation distance and backlash of the bevel gear pair.

3. The electric spindle technology is adopted to realize the zero transmission of the rotation of the two spindles, which can increase the speed and maintain the dynamic stability at high speed.

4. Significantly improve production efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the utility model;

Fig. 2 is a sectional view of the active box in Fig. 1;

Fig. 3 a is a sectional view of the driven box and a schematic diagram of the automatic movement structure in Fig. 1;

Fig. 3b is a 180-degree partial cross-sectional view of A-A in Fig. 3a;

Fig. 3c is a 180-degree partial cross-sectional view of B-B of Fig. 3a;

Fig. 3d is a partial view of A direction of Fig. 3a;

Figure 3e is a partial sectional view of C-C in Figure 3d;

Fig. 4 is a sectional view of the column and the automatic moving structure;

Figure 5. Schematic view of a ground bevel gear pair and its mandrel.

"Description of Serial Numbers in the Attached Drawings"

100: bed

101: active guide rail; 102: driven guide rail

200: active box

201: Active spindle 202: Sliding sleeve 203: Active box

204: Cylinder 205: Push rod 206: Cylinder

207: Tie rod 208: Flange 209: Disc spring

210: cooling water jacket 211: screw 212: flange

213: Motor 214: Elastic sleeve 215: Motor jacket

216: Flange 217: Piston 218: Piston

300: driven box

301: Driven spindle 302: Pull rod 303: Flange

304: cooling water jacket 305: elastic sleeve 306: driven box

307: Push rod 308: Motor jacket 309: Cylinder

310: Cylinder 311: Piston 312: Piston

313: Flange 314: Motor 315: Flange

316: screw 317: disc spring 318: servo motor

319: Bearing seat 320: Coupling 321: Ball screw pair

322: Ball screw nut 323: Guide pin 324: Piston

325: Spring 326: Cylinder 327: Flange

328: Proximity switch 329: Bearing 330: Washer

331: Washer 332: Nut 333: Screw

334: pipe joint 335: screw 336: screw

337: Proximity switch bracket

400: column

401: Servo motor 402: Coupling 403: Nut

404: Bearing 405: Screw 406: Bearing seat

407: Ball screw pair 408: Screw 409: Balance cylinder

410: screw 411: nut 412: transition joint

413: Nut 414: Joint bearing 415: Nut

416: Column 417: Servo motor 418: Coupling

419: Nut 420: Washer 421: Washer

422: Bearing 423: Ball screw pair 424: Nut seat

425: Bearing seat 426: Vertical guide rail 427: Ball screw nut

501: Driving gear mandrel 502: Driven gear mandrel

503: driving gear 504: driven gear

Detailed ways

Embodiments of the utility model are described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the utility model provides a spiral bevel gear CNC gear grinding machine, the CNC bevel gear grinding machine includes: bed 100, column 400, driving box 200, driven box 300, numerical control system (Fig. not shown); the bed 100 is provided with a driving guide rail 101 and a driven guide rail 102 at 90° to each other.

The column 400 is arranged on the active guide rail 101 on the bed 100, and an automatic movement mechanism that moves along the active guide rail 101 is arranged between the bottom of the column 400 and the bed 100; the active box 200 is hung on the side of the column 400, and the active box The bottom of the 200 is provided with an automatic movement mechanism that can move vertically along the side of the column 400; the driven box 300 is arranged on the driven guide rail 102 on the bed 100, and a An automatic moving mechanism that moves along the driven guide rail 102; the driving box 200 and the driven box 300 are respectively provided with a driving main shaft 201 and a driven main shaft 301 placed vertically and horizontally to each other, and the inner holes of the driving main shaft 201 and the driven main shaft 301 are installed respectively. Grinding the driving gear mandrel 501 of driving gear 503 and the driven gear mandrel 502 of driven gear 504; Connect directly and be driven by it.

As shown in Figures 1 and 4, the automatic movement mechanism that moves along the active guide rail 101 between the bottom of the column 400 and the bed 100 includes: a servo motor 417, a ball screw pair 423 connected to the servo motor, a ball screw The bar pair is connected to the nut seat 424 at the bottom of the column 400 , and the nut seat 424 is fixed at the bottom of the column 400 .

The ball screw pair 423 is installed in the nut seat 424 , supported by the bearing 422 , and fixed on the bearing seat 425 through the washers 420 and 421 and the nut 419 . The end of the ball screw pair 423 is directly connected to the servo motor 417 through a coupling 418, the servo motor 417 is fixed to the end surface of the bearing seat 425 by screws, and the bearing seat 425 is fixed to the bed 100 by screws. The servo motor 417 drives the ball screw pair 423 to make the column 400 move linearly along the driving guide rail 101 .

As shown in Figure 4, the automatic moving mechanism that the active box 200 moves vertically along the side of the column 400 includes: a servo motor 401 installed on the top of the column 400; a ball screw pair 407 connected with the servo motor 401; The ball screw nut 427 fixedly connected to the lever pair 407 is fixed on the bottom of the active box body 203 .

More specifically: the automatic movement mechanism along the vertical direction between the bottom of the column 400 and the active box 200 is: the ball screw pair 407 is supported by the bearing 404, fixed on the bearing seat 406 by the nut 403, and the end of the lead screw 407 The part is directly connected with the servo motor 401 through the coupling 402, the servo motor 401 is fixed to the end surface of the bearing seat 406 by screws, and the bearing seat 406 is fixed on the column 416 by the screws 405. The ball screw pair 407 is fixed to the driving box 203 by screws on the end face of the nut. The servo motor 401 drives the ball screw pair 407 to make the active box 200 move linearly in the vertical direction along the vertical guide rail 426 (see FIG. 1 ). The balance cylinder 409 is connected with the active box 200 through the nut 411, the transition joint 412, the nut 413, the joint bearing 414 and the nut 415, which can help the ball screw pair 407 to share a part of the weight of the active box 200 and reduce the wear of the ball screw pair 407. Extend the service life of the ball screw pair 407. The upper and lower parts of the joint bearing 414 allow an offset of ±2.5 degrees, which can protect the cylinder when the cylinder rod is not parallel to the movement direction of the active box 200 . Under the situation that servomotor 401 cuts off suddenly, balance cylinder 409 can make active box 200 not slide down by accumulator (in pneumatic control part), avoids causing accident.

As shown in Fig. 3a to Fig. 3e, an automatic moving mechanism that moves along the driven guide rail 102 is provided between the bottom of the driven box 300 and the bed 100, including: a servo motor 318 supported on the bed 100, a servo motor connected to the The ball screw pair 321 of the motor, the ball screw nut 322 connected with the ball screw pair, and the flexible transmission mechanism that pushes the driven box 300 to move are fixedly connected between the ball screw nut 322 and the through hole at the bottom of the driven box body 306 .

The flexible transmission mechanism includes: a cylinder 326 with a piston 324 inside; one end of the cylinder 326 is connected to one side of the through hole at the bottom of the driven box body 306, and the other end of the cylinder 326 is connected to the flange 327; the inner hole of the piston 324 is fastened Set on the outer diameter of the ball screw nut 322, one end of the piston 324 is installed in the inner hole of the flange 327, and the other end of the piston 324 is installed in the through hole at the bottom of the box body 306; between the piston 324 and the flange 327 Spring 325 is housed; Pneumatic pipe joint 334 communicating with air source is housed on flange plate 327;

More specifically: the automatic movement mechanism of the driven box 300 along the bed rail 102 horizontal direction is: a piston 324 is installed in the bottom hole of the driven box 306, the piston 324 is installed in the cylinder 326, and one end of the piston 324 is installed In the flange 327, the other end is installed in the hole at the bottom of the casing 306. The flange 327 , the cylinder 326 and the casing 306 are fixed together by screws 335 , 336 , so that the piston 324 can move slightly in the cylinder 326 and be guided by the flange 327 and the casing 306 . The guide pin 323 prevents the piston 324 from turning as it moves. The ball screw nut 322 is fastened in the hole of the piston 324 by screws; one side of the ball screw pair 321 is fitted in the ball screw nut 322, and the other side of the ball screw pair 321 is supported by the bearing 329, and the washer 330 , 331 and nut 332 are fixed on the bearing seat 319; the end of the ball screw pair 321 is directly connected with the servo motor 318 through the coupling 320, the servo motor 318 is fixed to the end surface of the bearing seat 319 by screws, and the bearing seat 319 passes through Screws 333 are fixed to the bed. Between the piston 324 and the flange 327, there are four springs 325 arranged at intervals. The flange 327 is equipped with a pneumatic pipe joint 334, which is always connected to the air source during the movement of the driven box 300, so as to ensure that there is no gap at the connecting end surface P of the piston 324 and the cylinder 326, and to ensure that the driving and driven cones When the gears are engaged, the driven wheel is always attached to the tooth surface of the driving bevel gear. The servo motor 318 drives the ball screw pair 321 to make the ball screw nut 322 and the piston 324 move axially. The piston 324 pushes the spring 325 , and the spring 325 pushes the driven box 300 to move linearly along the driven guide rail 102 . The spring 325 acts as a flexible transmission. The proximity switch 328 is used to confirm the position of the piston 324, that is, when there is no gap at the connecting end surface of the piston 324 and the cylinder 326, the switch is turned on. When the driven box advances in place, that is, when the main and driven bevel gears are meshed without backlash, the spring 325 is compressed, and a gap appears at the connecting end face of the piston 324 and the cylinder 326, the gas in the cylinder 326 is compressed, and the pressure rises to make the pressure switch ( In the pneumatic control part (not shown in the figure) signal, the electric control system will make the servo motor 318 stop rotating, the leading screw 321 also stops rotating, the nut 322 and the piston 324 stop moving, and the driven box 300 stops advancing. At this time, under the action of the built-in motors 213 and 314, the driving and driven bevel gears start to mesh on both sides, and rotate slowly in the forward and reverse directions to detect the burr on the gear tooth surface and the pitch error, and finally determine the driven gear. The ideal installation distance. Now under the effect of spring 325 and cylinder 326, driven box 300 can float along driven guide rail 102 on the bed, and when guaranteeing that the driving and driven bevel gears mesh, the driven gear is always attached to the tooth surface of the driving bevel gear.

As shown in Figure 2, the connection structure between the driving main shaft 201 and the motor 213 installed inside the driving box 200 is: a motor 213 is arranged in the driving box 203, and the rotor of the motor 213 is sleeved on the outer diameter of the driving main shaft 201; Sliding sleeve 202 is installed in the center hole of the front end of the main shaft 201, and disc spring 209 is housed between one side of the sliding sleeve 202 and the center hole of the active main shaft 201, and the inner diameter of the sliding sleeve 202 is equipped with a pull bar 207 whose two ends are longer than the sliding sleeve, and the pull rod 207 One end of the pull rod 207 is inserted into the inner hole of one end of the push rod 205 slidingly; The piston 217 and the piston 218 are connected, and the cylinder 204 and the cylinder 206 are arranged in the active box 203 .

More specifically: a built-in motor 213 and a motor casing 215 are installed in the active box body 203 through the flange 212 and the flange 216 . The central hole of the motor 213 rotor is equipped with a driving main shaft 201 that rotates with the motor rotor, and a pull bar 207 for loading and unloading workpieces, a sliding sleeve 202 and a disc spring 209 are installed in the central hole of the driving main shaft 201. A push rod 205 for pushing the pull rod 207 and an elastic sleeve 214 for preventing the front end of the push rod 205 from drooping are installed inside. Two cylinders 204 and 206 that drive the movement of the push rod 205 are installed at the rear end of the active box body 203 , and the piston 217 and the piston 218 of the two cylinders are all installed at the tail end of the push rod 205 . The disc spring 209 makes the pull rod 207 clamp the workpiece, and the piston 217 and the piston 218 make the pull rod 207 loosen the workpiece. The front end of the driving main shaft 201 on which the driving gear 503 is installed protrudes from one end of the cooling water jacket 210 , and the cooling water jacket 210 is connected with the driving box 203 through screws 211 and flanges 212 .

As shown in Figure 3a, the connection structure between the driven main shaft 301 and the motor 314 installed inside the driven box 300 is: a motor 314 is arranged in the driven box 306, and the rotor of the motor 314 is set outside the driven main shaft 301 On the diameter; one end of the pull rod 302 is slid in the center hole of the front end of the driven spindle 301, and a disc spring 317 is installed between the pull rod 302 and the center hole of the driven spindle 301, and one end of the disc spring 317 contacts the flange 303, and the flange 303 is fixed in the center hole of the driven main shaft 301, and the other end of the disc spring 317 contacts the stepped shaft end face of the pull rod 302; the other end of the pull rod 302 is slidably fitted on the push rod 307; Piston 311, piston 312 in cylinder 309, cylinder 310) of driven main shaft 301 rear end are connected, and described cylinder 309, cylinder 310 are arranged in driven casing 306.

More specifically: a built-in motor 314 and a motor casing 308 are installed in the driven box body 306 through the flange 313 and the flange 315 . The driven main shaft 301 that rotates with the motor rotor is installed in the central hole of the motor 314 rotors, the pull bar 302 and the disc spring 317 for loading and unloading workpieces are installed in the driven main shaft 301 central hole, and the driven main shaft 301 central hole is equipped with The push rod 307 that pushes the pull rod 302 and the elastic sleeve 305 that prevents the front end of the push rod from drooping. Two cylinders 309 and 310 that drive the movement of the push rod 307 are installed at the rear end of the driven box body 306 , and the piston 311 and the piston 312 of the two cylinders are all installed at the tail end of the push rod 307 . The disc spring 317 makes the pull rod 302 clamp the workpiece, and the piston 311 and the piston 312 make the pull rod 302 loosen the workpiece. The front end of the driven main shaft 301 on which the driven gear 504 is installed protrudes from one end of the cooling water jacket 304 , and the cooling water jacket 304 is connected with the driven box 306 through screws 316 and flanges 315 .

The utility model controls the motor 213 and the motor 314 built in the active box body and the driven box body through the numerical control system so as to realize the loading of the active main shaft and the driven main shaft.

Claims (7)

1. A kind of spiral bevel gear numerical control grinding machine, this spiral bevel gear numerical control grinding machine comprises: bed, column, driving box, driven box, numerical control system; The driving guide rail (101) and the driven guide rail (102) of 90° are characterized in that the column (400) is arranged on the active guide rail (101) on the bed (100), at the bottom of the column (400) and the bed An automatic moving mechanism that moves along the active guide rail (101) is arranged between the bodies (100); the active box (200) is side hung on the side of the column (400), and the bottom of the active box (200) is provided with a device that can vertically move along the side of the column (400). The automatic movement mechanism that moves in the direction; the driven box (300) is arranged on the driven guide rail (102) on the bed (100), and the bottom of the driven box (300) and the bed (100) are provided with An automatic moving mechanism that moves along the driven guide rail (102); the driving box (200) and the driven box (300) are respectively provided with a driving main shaft (201) and a driven main shaft (301) placed vertically and horizontally, and the driving main shaft (201 ) and the inner hole of the driven main shaft (301) are installed respectively the driven gear mandrel (501) of the ground driving gear (503) and the driven gear mandrel (502) of the driven gear (504); the driving main shaft (201) and the driven main shaft (301) are respectively directly connected with and driven by the motors (213, 314) installed in the active box (200) and the driven box (300). 2. A numerically controlled gear grinding machine for spiral bevel gears according to claim 1, characterized in that, between the bottom of the column (400) and the bed (100), there is a device that moves along the active guide rail (101). The automatic moving mechanism includes: a servo motor (417), a ball screw pair (423) connected to the servo motor, a nut seat (424) at the bottom of the ball screw pair connected to the column (400), and the nut seat (424) is fixed on the column (400 )bottom. 3. The CNC gear grinding machine for spiral bevel gears according to claim 1, characterized in that, between the bottom of the driven box (300) and the bed (100), there is a driven guide rail (102 ) moving automatic mechanism includes: a servo motor (318) supported on the bed (100), a ball screw pair (321) connected to the servo motor, a ball screw nut (322) connected to the ball screw pair, A flexible transmission mechanism for pushing the driven box (300) to move is fixedly connected between the ball screw nut (322) and the through hole at the bottom of the driven box (306). 4. A kind of spiral bevel gear CNC gear grinding machine according to claim 3, characterized in that, the flexible transmission mechanism comprises: a cylinder (326) with a piston (324) inside; one end of the cylinder (326) is connected On one side of the through hole at the bottom of the driven box (306), the other end of the cylinder (326) is connected to the flange (327); the inner hole of the piston (324) is tightly fitted on the outer diameter of the ball screw nut (322) One end of the piston (324) is installed in the inner hole of the flange (327), and the other end of the piston (324) is installed in the through hole at the bottom of the casing (306); between the piston (324) and the flange (327) A spring (325) is installed between them; the pneumatic pipe joint (334) connected to the air source is installed on the flange (327); the proximity switch (328) for confirming the position of the piston (324) is installed on the flange (327) on the proximity switch bracket (337). 5. A kind of spiral bevel gear CNC gear grinding machine according to claim 1, characterized in that, the automatic movement mechanism for the active box (200) to move vertically along the side of the column (400) comprises; installed on the column ( 400) the servo motor (401) on the top; the ball screw pair (407) connected with the servo motor (401); the ball screw nut (427) fixedly connected with the ball screw pair (407), the ball screw Nut is fixed on the bottom of active casing (203). 6. A kind of spiral bevel gear numerical control grinding machine according to claim 1, characterized in that, the connecting structure between the driving main shaft (201) and the motor (213) installed inside the driving box (200) is: A motor (213) is arranged in the active casing (203), and the rotor of the motor (213) is sleeved on the outer diameter of the active main shaft (201); A disc spring (209) is arranged between one side of the cover (202) and the central hole of the driving main shaft (201), and the inner diameter of the sliding sleeve (202) is equipped with a pull rod (207) whose two ends are longer than the sliding sleeve, and one end of the pull rod (207) Located in the center hole of the front end of the driving spindle (201), the other end of the pull rod (207) is slidably inserted into the inner hole at one end of the push rod (205); the other end of the push rod (205) runs through the center hole of the driving spindle (201) and the driving spindle ( 201) The cylinders (204, 206) at the rear end are connected to the pistons (217, 218), and the cylinders (204, 206) are arranged in the active box (203). 7. The CNC gear grinding machine for spiral bevel gears according to claim 1, characterized in that, the connection structure between the driven main shaft (301) and the motor (314) installed inside the driven box (300) is : be provided with motor (314) in driven casing (306), the rotor sleeve of motor (314) is on the outer diameter of driven main shaft (301); Pull bar ( 302), a disc spring (317) is installed between the pull rod (302) and the center hole of the driven main shaft (301), and one end of the disc spring (317) contacts the flange (303), and the flange (303) is fixed In the center hole of the driven main shaft (301), the other end of the disc spring (317) contacts the stepped shaft end face of the pull rod (302); the other end of the pull rod (302) is slidably fitted on the push rod (307); the push rod (307) The other end passes through the central hole of the driven main shaft (301) and is connected with the piston (311, 312) in the cylinder (309, 310) rear end of the driven main shaft (301), and the cylinder (309, 310) is arranged on the driven box ( 306) within.

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