CN103447872A - Self-adapting tapping machine with retractable motor inner shaft - Google Patents

Abstract

The invention relates to a self-adaptive tapping machine with a retractable motor inner shaft, which includes a motor assembly and a screw nut transmission mechanism; the motor assembly includes a casing, a stator, a rotor core, a motor main shaft, a front cover and a rear cover; the motor main shaft consists of The shaft sleeve body coaxially fixed in the central hole of the rotor iron core and the inner shaft coaxially movably sleeved in the shaft sleeve body body, the inner shaft cannot rotate relative to the shaft sleeve body but can move axially relative to the shaft sleeve body, the inner shaft The front end is connected with a tap or a die; the screw nut transmission mechanism includes a main screw, a rear fixing plate, a main nut, a guide rod and a pitch adaptation spring; the pitch of the main nut and the main screw is greater than or equal to that of the tap or the die. The invention can not only use the inner shaft of the motor to rotate with the main screw while the main nut does not rotate to realize the rapid advance and retreat of the idle stroke, but also can automatically adapt to the pitch of the tap or die to complete the tapping through the pitch adaptation spring to compress the main nut, which is beneficial Simplify the structure and improve work efficiency.

Description

Self-adaptive tapping machine with retractable motor inner shaft

technical field

The invention relates to a tapping machine in mechanical processing equipment, in particular to a self-adaptive tapping machine with a retractable motor inner shaft.

Background technique

Existing automatic tapping machine is generally made up of three-phase asynchronous motor, belt, main shaft, lifting cover, electromagnetic clutch, screw mandrel and gear, and motor is connected with main shaft and screw mandrel by gear and belt. The feed speed required for rapid advance and retreat and synchronous tapping is completed by switching gears with different numbers of teeth with an electromagnetic clutch. The switch is used to commutate the power supply to realize the positive and negative rotation of the motor to drive the main shaft and the screw to forward and reverse, and to control the forward and backward of the main shaft. To achieve synchronous tapping.

The disadvantage of this structure is that the gears need to be replaced when taps or dies with different pitches are tapped, and the motor is used to control the main shaft, and the electromagnetic clutch is used to switch the gear teeth to complete the idle stroke fast forward and backward and the working stroke to advance and retreat according to the pitch. The structure is relatively complicated. , the manufacturing precision is high, and the cost is also high.

Contents of the invention

In order to overcome the above defects, the present invention provides a self-adaptive tapping machine with a retractable motor inner shaft, which can not only use the inner shaft of the motor to rotate with the main screw while the main nut does not rotate to realize rapid advance and retreat in idle strokes, but also can The main nut is compressed by the pitch adaptation spring to automatically adapt to the pitch of the tap or die to complete the tapping, which is beneficial to simplify the structure and improve work efficiency.

The technical solution adopted by the present invention is as follows: a self-adaptive tapping machine with a retractable motor inner shaft, which is characterized in that it includes a motor assembly and a screw nut transmission mechanism;

The motor assembly includes a housing for fixed installation and connection with an external frame, a stator fixed in the housing, a rotor core movably arranged in the middle of the stator, a motor shaft arranged in the middle of the rotor core, and a motor shaft installed in the housing respectively. The front cover and the rear cover at the front and rear ends; the motor shaft is composed of a shaft sleeve body coaxially fixed in the central hole of the rotor iron core and an inner shaft coaxially movably sleeved in the shaft sleeve body body, and the shaft sleeve body passes through the motor The bearing is connected with the housing or with the front cover and the back cover in rotation. The inner shaft cannot rotate relative to the sleeve body but can move axially relative to the sleeve body. The front end of the inner shaft is provided with a connecting part for installing taps or dies;

The screw nut transmission mechanism includes a main screw, a main nut, a guide rod, a rear fixing plate and a pitch adaptation spring; the rear end of the inner shaft is coaxially fixedly connected with the front end of the main screw; the main nut is located between the rear cover and the rear Between the fixed plates, the main nut and the main screw are threaded and paired, and the pitch of the main nut and the main screw is greater than or equal to the pitch of the tap or die to be installed; the front end of the guide rod is fixedly connected with the back cover, and the guide rod The middle section moves through the guide perforation arranged in the main nut body, and the rear end of the guide rod is fixedly connected with the rear fixing plate; the pitch adapts to the spring sleeve and is placed on the outer periphery of the guide rod and compresses between the main nut and the rear fixing plate.

In addition, the above-mentioned technical solution of the present invention has also made the following further improvements:

In order to achieve automatic phase change after tapping, so that the tap or die can automatically withdraw, the self-adaptive tapping machine also includes a phase change travel switch and a travel limit screw, and the phase change travel switch is installed on the rear cover On the side facing the rear fixed plate, there is a gap in the body of the main nut to avoid interference with the operation of the commutation travel switch; the travel limit screw is installed at the position corresponding to the rear end of the main screw rod and the commutation travel switch, and the commutation travel When the switch touches the travel limit screw, it can start the motor assembly to rotate in reverse.

In order to quickly control the motor assembly to stop rotating after a tapping cycle is over, and make each component automatically return to the initial state, the self-adaptive tapping machine also includes a parking brake mechanism, which includes a driving disc, Bearing shaft, two-way bearing washer, two-way bearing, one-way bearing washer, one-way bearing key, one-way bearing, friction disc, anti-rotation disc, fixing screw, bearing shaft screw, spacing screw, brake spring, stop adjustment screw and stop stroke switch;

The bearing shaft and the rear section of the main screw are coaxially socketed, and the bearing shaft screw locks the bearing shaft and the main screw together from the rear side of the bearing shaft forward;

The middle part of the drive disc is connected to the bearing shaft through bi-directional bearings for bi-directional rotation. There are through holes around the drive disc to facilitate the guide rod and pitch to adapt to the spring's movable insertion. The stroke limit screw is fixed and installed on the front side of the drive disc;

The friction disc is located on the rear side of the driving disc and is connected to the bearing shaft through a one-way bearing for one-way rotation. The one-way bearing is key-connected between the inner ring of the one-way bearing and the outer circle of the bearing shaft. Lock the friction disc and the outer ring of the one-way bearing together inwardly;

The anti-rotation plate is located between the friction plate and the rear fixed plate, and the brake spring compresses and acts between the anti-rotation plate and the rear fixed plate. There are through holes around the anti-rotation plate to facilitate the guide rod and thread pitch to adapt to the spring’s movable insertion; The front section is threadedly connected with the threaded hole in the middle of the anti-rotation plate, the middle section of the distance limiting screw is movably inserted in the through hole in the middle of the rear fixing plate, and the rear end of the distance limiting screw is provided with an outer hole larger than the through hole in the middle of the rear fixing plate. flange;

The stop adjustment screw and the stop travel switch are respectively installed at the positions corresponding to the rear side of the driving disc and the front side of the anti-rotation disc. When the stop travel switch touches the stop adjustment screw, it can control the power supply of the motor assembly to be disconnected;

The two-way bearing washer is arranged between the end of the thread section of the main screw rod, the front end of the inner ring of the two-way bearing, and the front end of the bearing shaft, and the one-way bearing washer is arranged between the rear end of the inner ring of the two-way bearing and the front end of the inner ring of the two-way bearing.

In order to make the self-adaptive tapping machine of the present invention have a waterproof function, the outer circle of the front end of the shaft sleeve body protruding from the housing is formed with external threads, and a waterproof cover with an annular groove structure is provided on the rear end surface through it. The internal thread fits and connects on the external thread at the front end of the shaft sleeve body, and the front end surface of the front cover is provided with a convex ring structure corresponding to the groove structure of the rear end surface of the waterproof cover, and the adjacent parts of the waterproof cover and the front cover are kept There are gaps.

The outer circle of the shaft sleeve body is tightly fitted and fixedly installed in the central hole of the rotor core. The front section of the inner shaft is the optical axis, and the rear section of the inner shaft is connected with the inner spline of the shaft sleeve body through the outer spline, so that the inner shaft The shaft cannot rotate relative to the sleeve body but can move axially relative to the sleeve body. During specific implementation, the inner shaft and the sleeve body can also be connected in other ways so that the inner shaft cannot rotate relative to the sleeve body but can move axially relative to the sleeve body, and is not limited to the ones shown in the accompanying drawings. Spline structure.

The connecting part arranged at the front end of the inner shaft for installing taps or dies includes a collet and a collet nut, the middle part of the front end of the inner shaft is provided with an inner taper hole for connecting with the collet, and the outer periphery of the front end of the inner shaft is provided with a External thread for collet nut connection.

Compared with the prior art, the present invention has the following beneficial effects:

(1) Since the present invention decomposes the motor shaft into a shaft sleeve body and an inner shaft, the shaft sleeve body is fixedly installed in the central hole of the rotor iron core, and the inner shaft cannot rotate relative to the shaft sleeve body but can move axially relative to the shaft sleeve body , so the inner shaft can be directly used as the lifting shaft during work, and the inner shaft is connected with the main screw to rotate while the main nut does not rotate to realize rapid advance and retreat in idle strokes, thereby saving the transmission shaft, belt, clutch and speed change mechanism, and simplifying the structure.

(2) Since the present invention presses the main nut to automatically adapt to the pitch of the tap or die through the pitch adaptation spring, it can automatically adjust the position of the main nut to complete automatic tapping, eliminating the trouble of replacing gears and improving work efficiency.

Description of drawings

Fig. 1 is an outline drawing of an embodiment of an adaptive tapping machine with a retractable motor inner shaft provided by the present invention.

Fig. 2 is a schematic diagram of the internal structure of the present invention.

Fig. 3 is a B-B sectional view of Fig. 2 .

The symbols in the figure are explained as follows:

101, housing, 102, rotor core, 103, shaft sleeve body, 104, inner shaft, 105, rear cover, 106, waterproof cover, 107, front cover, 108, motor bearing;

201, main screw rod, 202, main nut, 203, guide rod, 204, rear fixed plate, 205, rear fixed plate screw, 206, pitch adaptation spring;

301, driving disc, 302, bearing shaft, 303, two-way bearing washer, 304, two-way bearing, 305, one-way bearing washer, 306, one-way bearing key, 307, one-way bearing, 308, friction disc, 309, stop disc , 310, fixing screw, 311, bearing shaft screw, 312, spacing screw, 313, brake spring;

401, travel limit screw, 402, commutation travel switch, 403, shutdown adjustment screw, 404, shutdown travel switch;

501, collet, 502, collet nut.

Detailed ways

The content of the present invention will be described in detail below in conjunction with specific embodiments, working principles and accompanying drawings:

(1) Example:

Figures 1 to 3 are structural schematic diagrams of an embodiment of an adaptive tapping machine with a retractable motor inner shaft provided by the present invention, including a motor assembly, a screw nut transmission mechanism, and a parking brake mechanism.

The motor assembly adopts a squirrel-cage motor, including a housing 101 for fixed installation and connection with an external frame, a stator 109 fixed in the housing 101, a rotor core 102 movably arranged in the middle of the stator 109, and a rotor core 102 arranged in the rotor. The motor shaft in the middle of the iron core 102 and the front cover 107 and the rear cover 105 are respectively installed at the front and rear ends of the casing 101 .

The central hole of the rotor core 102 is reamed, and the inner diameter of the rotor core 102 after reaming is not greater than the inner diameter of the fence cage in the rotor core 102; It consists of an inner shaft 104 with external splines. The rear end surface of the shaft sleeve body 103 is located at the outer end surface of the motor bearing 108 at the rear of the housing 101. The outer circle of the shaft sleeve body 103 is tightly fitted and fixed in the central hole of the rotor iron core 102. The front section of the inner shaft 104 is an optical axis, and the front end of the optical axis is provided with an inner taper hole and an outer thread for installing a chuck 501 of a tap or a die. The outer circle of the front end of the shaft sleeve body 103 is machined with external threads, and a waterproof cover 106 with an annular groove structure on the end surface is connected to the external threads of the front end of the shaft sleeve body 103 through internal thread fitting, and the outer end surface of the front cover 107 is provided with There is a protruding ring structure corresponding to the annular groove structure of the waterproof cover 106, and there is a gap between adjacent parts of the two.

The main screw 201 and the rear section of the inner shaft 104 are connected as one, and the screw nut transmission mechanism includes the main screw 201, the main nut 202, the guide rod 203, the rear fixing plate 204, the rear fixing plate screw 205, and the travel limit screw 401 and commutation travel switch 402.

The main screw 201 and the inner shaft 104 can also be directly manufactured as one part. The upper end of the main screw 201 is columnar and has an internally threaded hole in the center. The central part of the main nut 202 has a threaded through hole, and there are 4 cylindrical guide perforated disks on the periphery, and there is a gap to avoid the interference of the commutation travel switch 402 installed on the back cover 105 . The main nut 202 is screwed into the main screw 201 . The pitch of the screwed paired main screw rod 201 and main nut 202 is greater than or equal to the pitch of the tap or die to be installed. Guide rod 203 is columnar, altogether 4, and one end has step threaded shaft, is screwed on the back cover 105 after passing 4 guide perforations on the main nut 202, and the other end center of guide rod 203 has threaded blind hole. There is a stepped through hole in the center of the rear fixed plate 204, and there are also 4 stepped through holes corresponding to the four cylindrical guide holes around the main nut. The four rear fixed plate screws 205 are screwed through the four stepped through holes on the rear fixed plate 204. Closed in the threaded inner hole of the guide rod 203, the rear fixing plate 204 is fixed on the upper end of the guide rod 203.

There are two pitch adaptation springs 206 , which are symmetrically compressed and sleeved on the guide rod 203 between the main nut 202 and the rear fixing plate 204 .

The parking brake mechanism is divided into two parts, one part is installed on the rear end of the main screw rod 201, including the driving disc 301, the bearing shaft 302, the two-way bearing washer 303, the two-way bearing 304, the one-way bearing washer 305, the one-way bearing key 306, One-way bearing 307, friction disc 308, set screw 310 and bearing shaft screw 311, the other part is installed on the rear fixed plate 204, including anti-rotation disc 309, spacing screw 312 and brake spring 313.

There is a stepped hole in the center of the driving disc 301, which is equipped with a two-way bearing 304, and there are also 4 through holes corresponding to the 4 through holes on the main nut 202, and the two guide rods 203 of the suit with the thread pitch adaptation spring 206 are respectively integrally worn. Through two through holes which are opposite, and there is a gap with the diameters of these two through holes, the other two guide rods 203 pass through the other two through holes, and are movably fitted with the holes. The plane of the driving disc 301 is also provided with two threaded through holes, one is equipped with a travel limit screw 401, the screw head is facing the position corresponding to the commutation travel switch 402, and the other is equipped with a stop adjusting screw 403, the screw The head faces the anti-rotation disk 309.

The bearing shaft 302 has a stepped shaft shape with a keyway, the outer diameter is concentric with the inner hole, and the two ends of the inner hole have stepped reaming. The diameter of the reamed hole at one end is fixedly matched with the columnar head of the main screw 201, and the reamed hole at the other end can accommodate the head of the fixing screw.

The friction disc 308 is a disc-shaped part with a stepped hole in the center and a threaded hole in the side.

The two-way bearing washer 303 and the one-way bearing washer 305 are both flat washers.

The one-way bearing 307 is set in the central step hole of the friction disc 308, and the fixing screw 310 installed in a threaded hole on the side of the friction disc 308 is locked on the keyway of the outer ring of the one-way bearing 307, and the friction disc 308 and the one-way The outer ring of the bearing 307 is connected as a whole.

One end of the bearing shaft 302 passes through the inner hole of the one-way bearing 307, stops at the step of the bearing shaft 302, and is fixedly fitted with the inner hole through the one-way bearing key 306, passes through the one-way bearing washer 305, and then passes through The inner hole of the two-way bearing 304 presses the two-way bearing washer 303 and locks it through the bearing shaft screw 311, and is sleeved on the columnar head of the main screw rod 201.

There is a threaded hole in the center of the anti-rotation disc 309, and there are 4 through holes corresponding to the 4 through holes of the driving disc. The two guide rods 203 fitted with the pitch adaptation springs 206 pass through the two opposite passages as a whole. hole, and there is a gap with the diameter of these two through holes, and the other two guide rods 203 pass through the other two through holes, and become a movable fit with these two through holes. Corresponding to the position of the stop adjustment screw 403, a stop travel switch 404 is installed.

The distance limiting screw 312 is a stepped shaft part with an externally threaded shaft at one end and a screwdriver groove at the other end. The threaded shaft end passes through the stepped hole in the center of the rear fixing plate 204 and passes through the inner hole of the brake spring 313 to be fixed on the anti-rotation disc 309. On the threaded hole in the center, the brake spring 313 is in a semi-compressed state, and the cylindrical section in the middle section of the spacer screw 312 and the step through hole in the center of the rear fixing plate 204 become a movable fit.

(2) The working principle of the present invention is described as follows:

Before starting the machine, the stop adjusting screw 403 is in the position of pressing the stop travel switch 404, the end face of the friction disc 308 is attached to the front face of the anti-rotation disc 309, and bears the elastic force of the brake spring 313, and the outer flange of the rear end of the distance limiting screw 312 There is a gap between the front end step surface and the rear end surface of the rear fixed plate 204, the rear end surface of the anti-rotation disc 309 and the front end surface of the rear fixed plate 204, the size of the gap is arbitrary, and the height of the travel limit screw 401 is adjusted.

When starting up, the motor assembly is energized, and the sleeve body 103 fixedly connected with the rotor core 102 drives the waterproof cover 106, the inner shaft 104 of the spline structure, the main screw 201, the bearing shaft 302, the two-way bearing washer 303, and the inner ring of the two-way bearing 304 , the inner ring of the one-way bearing washer 305, the one-way bearing 307, the bearing shaft screw 311, the collet 501, the collet nut 502 and the tap or die synchronously forward. Because the inner and outer rings of the one-way bearing 307 are in a state of relative motion when they are forward rotating, the rear end face of the friction disc 308 connected to the outer ring of the one-way bearing 307 is attached to the front end face of the anti-rotation disc 309, and is pressed by the elastic force of the brake spring 313. Friction resistance is generated, so the friction disc 308 does not rotate. The main nut 202 is restricted by the pressure of the guide rod 203 and the pitch adapting spring 206 and cannot rotate, and rests on the rear end surface of the rear cover 105 . The main screw rod 201 that is screwed through the main nut 202 rotates with the inner shaft 104, the driving disc 301, the bearing shaft 302, the two-way bearing washer 303, the two-way bearing 304, the one-way bearing washer 305, the one-way bearing key 306, and the one-way bearing. To the bearing 307, the friction disc 308, the fixing screw 310, the bearing shaft screw 311, the collet 501, the collet nut 502 and the tap or die synchronously advance downwards, this is the transmission mechanism of the screw nut, the rotor core 102 of the motor assembly rotates One turn, the inner shaft 104 and the main screw 201 advance the distance of the pitch of the main screw 201 with one tooth. Affected by the elastic force of the brake spring 313 , the anti-rotation disc 309 and the spacing screw 312 also move downward along with the main screw 201 .

When the front-end stepped surface of the distance-limiting screw 312 rear end outer flange of the distance-limiting screw 312 hits the rear end face of the rear fixed plate 204, the stop disc 309 connected with the distance-limiting screw 312 is hindered and stops moving forward, and the main screw 201 takes the The friction disc 308 breaks away from the contact with the front end surface of the anti-rotation disc 309 and continues to move forward.

When the tap or die that rotates along with the main screw 201 touches the workpiece, the speed of tapping advance is controlled by the pitch of the tap or die itself, and the main screw 201 advances a distance of one tap or die pitch per revolution to enter the work. Stroke, when the pitch of the main screw 201 is greater than the pitch of the tap or the die, it is equivalent to the slowing down of the main screw 201 while the rotational speed remains unchanged, because the advancing distance generated by the main screw 201 per revolution relative to the main nut 202 is inherent Therefore, the resistance when the main screw rod 201 advances slowly will force the main nut 202 screwed on the main screw rod 201 to overcome its own weight, friction and pitch adaptation spring 206 to retreat to compensate for the distance gap. (When the pitch of the main screw 201 is equal to the pitch of the tap or the die, it is synchronous tapping, and there is no problem of the speed change of the main screw 201 and the retreat of the main nut 202.)

When the adjustable stroke limit screw 401 on the driving disk 301 moving downward together hits the commutation stroke switch 402 fixed on the back cover 105, the tapping working stroke is in place, the motor assembly controlled by the external electrical device reverses, and the tap Or the die is withdrawn from the workpiece along the thread produced by the workpiece, and at the same time, the pitch adaptation spring 206 synchronously presses the main nut 202 back to the initial position.

In the same way, after the tap or die exits the workpiece, it will retreat at the speed of the initial idle stroke.

When the stop adjustment screw 403 on the driving disc 301 retreating together hits the stop travel switch 404 fixed on the stop disc 309, the power supply of the motor assembly controlled by the external electrical appliance is disconnected, but the motor assembly is still rotating inertially, and the main screw rod 201 Together with the one-way bearing 307 and the friction disc 308, the disc 309 is still pressed against the disc 309, forcing the disc 309 to overcome its own weight and the elastic force of the brake spring 313 to retreat a certain distance before stopping. Since the inner and outer rings of the one-way bearing 307 are in a state of being unable to move relative to each other in the reverse direction, it is equivalent to that the inner and outer rings are fixed together. Therefore, the friction disc 308 connected to the outer ring of the one-way bearing 307 will rotate synchronously with the main screw 201. When friction When the rear end surface of the disk 308 is pressed against the anti-rotation disk 309, friction will be generated between the rear end surface of the friction disk 308 and the front end surface of the anti-rotation disk 309, so that the inertial rotation of the motor assembly is stopped quickly, and one working cycle is completed.

By designing the elastic force of the brake spring 313 and the length of the middle section of the spacing screw 312, the anti-rotation disc 309 after a working cycle can be controlled at a position not in contact with the rear fixed plate 204, that is, return to the initial state.

Claims (6)

1. the interior retractable self adaptation tooth machining unit of axle of motor, is characterized in that: comprise electric machine assembly and screw-and-nut mechanism;

Described electric machine assembly comprises housing (101) for being connected with the fixed installation of outside frame, be fixed on stator (109) in housing (101), be movably set in stator (109) middle part rotor core (102), be located at the electric machine main shaft in the middle part of rotor core (102) and protecgulum (107) and the bonnet (105) that is installed on respectively housing (101) rear and front end; The sleeve body (103) of described electric machine main shaft in coaxially being fixedly installed in rotor core (102) medium pore and the interior axle (104) coaxially be movably set in sleeve body (103) body form, sleeve body (103) is by motor bearings (108) and housing (101) or be rotationally connected with protecgulum (107) and bonnet (105), interior axle (104) can not rotate but can move axially by relative sleeve body (103) relative to sleeve body (103), and the front end of interior axle (104) is provided with for the attaching parts of screw tap or screw die are installed;

Described screw-and-nut mechanism comprises that driving screw (201), mother nut (202), guide rod (203), rear fixed plate (204) and pitch adapt to spring (206); The rear end of described interior axle (104) coaxially is fixedly connected with the front end of driving screw (201); Described mother nut (202) is positioned between bonnet (105) and rear fixed plate (204), mother nut (202) and driving screw (201) screw thread screw up pairing and are connected, and the pitch of mother nut (202) and driving screw (201) is more than or equal to the screw tap that will install or the pitch of screw die; The front end of described guide rod (203) is fixedly connected with bonnet (105), the movable guiding perforation through being arranged in mother nut (202) body in the stage casing of guide rod (203), and the rear end of guide rod (203) is fixedly connected with rear fixed plate (204); Described pitch adapts to spring (206) and is placed on guide rod (203) periphery and compression between mother nut (202) and rear fixed plate (204).

2. the retractable self adaptation tooth machining unit of axle in motor according to claim 1, it is characterized in that: described self adaptation tooth machining unit also comprises commutation travel switch (402) and stroke limit screw (401), described commutation travel switch (402) is installed on the upper side towards rear fixed plate (204) of bonnet (105), is provided with the breach of avoiding interfering commutation travel switch (402) work in mother nut (202) body; Described stroke limit screw (401) is installed on the position corresponding with commutation travel switch (402), driving screw (201) rear end, and described commutation travel switch (402), can the reverse rotation of starter motor assembly when touching stroke limit screw (401).

3. the retractable self adaptation tooth machining unit of axle in motor according to claim 2, it is characterized in that: described self adaptation tooth machining unit also comprises the shutdown braking mechanism, described shutdown braking mechanism comprises driving disc spacing pressing (301), bearing shaft (302), two-way bearing washer (303), two-way bearing (304), unilateral bearing packing ring (305), unilateral bearing key (306), unilateral bearing (307), frictional disk (308), spline dish (309), hold-down screw (310), bearing shaft screw (311), range line screw (312), brake spring (313), shut down adjustment screw (403) and shut down travel switch (404),

Bearing shaft (302) coaxially is socketed with the back segment of driving screw (201), and bearing shaft screw (311) is locked together bearing shaft (302) and driving screw (201) forward from bearing shaft (302) rear side;

Driving disc spacing pressing (301) middle part is connected with bearing shaft (302) Double-directional rotary by two-way bearing (304), the surrounding of driving disc spacing pressing (301) is provided with to be convenient to guide rod (203) and pitch and to adapt to the through hole that spring (206) activity places, and described stroke limit screw (401) is fixedly mounted on the front side of driving disc spacing pressing (301);

Frictional disk (308) is positioned at driving disc spacing pressing (301) rear side and is connected with bearing shaft (302) one-directional rotation by unilateral bearing (307), unilateral bearing key (306) is connected between the cylindrical of the inner ring of unilateral bearing (307) and bearing shaft (302), and hold-down screw (310) inwardly is locked together frictional disk (308) and the outer ring of unilateral bearing (307) from the peripheral part side direction of frictional disk (308);

Spline dish (309) is positioned between frictional disk (308) and rear fixed plate (204), brake spring (313) compression is between spline dish (309) and rear fixed plate (204), and the surrounding of spline dish (309) is provided with to be convenient to guide rod (203) and pitch and to adapt to the through hole that spring (206) activity places; The leading portion of range line screw (312) is threaded with the screwed hole of being located at spline dish (309) middle part, the stage casing activity of range line screw (312) is set in the through hole of being located at rear fixed plate (204) middle part, and the rear end of range line screw (312) is provided with the outward flange that is greater than rear fixed plate (204) middle through-hole;

Shut down adjustment screw (403) and be installed on respectively driving disc spacing pressing (301) rear side and corresponding position, spline dish (309) front side with shutdown travel switch (404), described shutdown travel switch (404) is when touching shutdown adjustment screw (403), and the power supply that can control electric machine assembly disconnects;

Two-way bearing washer (303) is located between the front end of inner ring front end, bearing shaft (302) of the thread segment latter end of driving screw (201) and two-way bearing (304), and unilateral bearing packing ring (305) is located between the inner ring front end of the inner ring rear end of two-way bearing (304) and two-way bearing (304).

4. the retractable self adaptation tooth machining unit of axle in motor according to claim 1, it is characterized in that: the leading section cylindrical car that sleeve body (103) stretches out housing (101) is shaped with external screw thread, the waterproof cover (106) that rear end face is provided with the annular recess structure is connected on the external screw thread of sleeve body (103) leading section by its internal thread fit, the front end face of protecgulum (107) is provided with the bulge loop structure corresponding to waterproof cover (106) rear end face groove structure, and maintains gap between the adjacent regions of waterproof cover (106) and protecgulum (107).

5. according to the retractable self adaptation tooth machining unit of axle in the described motor of any one in claim 1-4, it is characterized in that: the cylindrical of sleeve body (103) is tightly fixed and is arranged in the medium pore of rotor core (102), the leading portion of interior axle (104) is optical axis, the back segment of interior axle (104) is connected by the internal spline of external splines and sleeve body (103), thereby makes interior axle (104) not rotate but can move axially by relative sleeve body (103) relative to sleeve body (103).

6. the retractable self adaptation tooth machining unit of axle in motor according to claim 5, it is characterized in that: the described attaching parts for screw tap or screw die are installed that are arranged at interior axle (104) front end comprise chuck (501) and chuck nut (502), interior axle (104) front center is provided with the internal taper hole for being connected with chuck (501), and interior axle (104) front end periphery is provided with the external screw thread for being connected with chuck nut (502).

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