CN211219508U

CN211219508U - Device for mounting a key in a key groove of a rotating shaft of an electric machine

Info

Publication number: CN211219508U
Application number: CN201921653146.0U
Authority: CN
Inventors: 蔡荣振; 张海东
Original assignee: Siemens Motor China Co ltd
Current assignee: Siemens Electromechanical Technology Jiangsu Co ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-08-11
Anticipated expiration: 2029-09-29

Abstract

The utility model relates to a device in keyway for inciting somebody to action pivot is installed to key, include: the supporting body is provided with a through hole, a limiting space, a communicating space and a clamping space which are sequentially arranged along the mounting direction and are communicated with each other; a pressing block arranged in the limiting space of the supporting body; a movable rod extending through the through hole of the support body and connected to the pressing block; wherein the clamping space is configured to receive and fix the shaft in the mounting direction, the communication space is configured to receive a key and to open the key groove of the shaft to the key, wherein the movable rod has a relatively rotatable connection with the press block and a threaded connection with the through hole, the spacing space is configured to rotationally fix the press block in a direction perpendicular to the mounting direction and to be drivingly translatable in the mounting direction by the movable rod to effect the mounting. The utility model discloses a device can realize the installation of key safely, swiftly, steadily.

Description

Device for mounting a key in a key groove of a rotating shaft of an electric machine

Technical Field

The utility model relates to a device in the keyway that is arranged in installing motor shaft with the key.

Background

In order to meet the quality requirement of the motor product, the motor is generally required to be subjected to various performance tests so as to detect whether the performance of the motor is qualified. For performance testing, it is common for low speed motors to pre-install the key into the keyway. Because the cooperation of key and keyway is interference fit, all can use the hammer to strike and install the key usually, then hold on the fan of motor with encoder etc..

However, the final no-load test of the spindle motor needs to be performed at 6000-10000 rpm. Because of such a high test rotation speed, in order to prevent the key from flying away from the key groove during the test, the key cannot be mounted in the key groove in advance, but the key is mounted after the final test process. However, because the encoder is installed at the fan end of the main shaft, the encoder is in poor contact when the hammer is normally used to knock the installation key, so that the installation accuracy of the encoder is affected, and the performance of the motor is affected.

Common tools like clamps also do not allow for the installation of a key into a keyway in a motor shaft because such common tools do not allow for the slow, safe pressing of the key, potentially resulting in damage to the key or keyway. Damage to the keyway represents a greater economic loss.

SUMMERY OF THE UTILITY MODEL

An exemplary embodiment is directed to overcoming the above and/or other disadvantages in the related art and providing a device capable of safely mounting a key in a key groove of a rotating shaft of a motor.

The technical problem is solved by the following technical scheme.

An apparatus for mounting a key into a keyway of a motor shaft according to an exemplary embodiment includes: the supporting body is provided with a through hole, a limiting space, a communicating space and a clamping space which are sequentially arranged along the mounting direction and are communicated with each other; a pressing block arranged in the spacing space of the support body; a movable rod extending through the through hole of the support body and having a protruding end protruding from the support body to which torque can be applied and a connecting end protruding into the stopper space to be connected with the pressing block; wherein the clamping space is configured to receive and fix the rotary shaft in the mounting direction, the communication space is configured to receive a key and to open a key groove of the rotary shaft to the key, wherein the movable rod has a relatively rotatable connection with the press block and a threaded connection with the through hole, and the spacing space is configured to rotationally fix the press block in a direction perpendicular to the mounting direction and to be driveably translated by the movable rod in the mounting direction to effect the mounting.

The utility model discloses based on following recognition: by providing the bearing body, the pressure piece and the movable rod as defined above, the shaft is fixed on the one hand by means of the clamping space conforming to the shape of the shaft, and on the other hand the pressure piece is entrained by means of the rotating movable rod, during which the pressure piece cannot rotate due to the limiting effect of the limiting space, but can only be driven in translation by the movable rod in the installation direction, so that the key is pressed safely into the key slot. Therefore, the key can be installed in the key groove of the motor rotating shaft in an installation mode which is simple and safe to operate and low in cost through the device of the exemplary embodiment.

According to one embodiment, the support body is designed as a single piece. This makes it possible to dispense with the assembly step of the support body, making the use of the device more time-saving and convenient.

According to a preferred embodiment, the support body is constructed in two parts. This makes it possible to assemble the support body according to the actual use, making the use of the device more flexible.

Preferably, the support body includes a stopper and a holder that are separated from each other, the stopper having the through hole and the stopper space, and a connecting member that fixedly connects the stopper and the holder in an installation direction, the holder having the communicating space and the holder space. By this configuration, different clamping members can be selected according to the size of the rotating shaft while providing the same limiting member, thereby reducing the cost to some extent.

Here, the connecting member may be provided such that the stopper and the holder are in contact with each other or not in contact with each other in the mounting direction. In this case, various configurations and connection methods of the connecting element can be used, as long as the connecting element makes it possible to fixedly connect the limiting element and the clamping element in the installation direction. For example, the connection may be a form-fit or friction-transmitting connection.

According to a preferred embodiment, the clamping space corresponds to the outer shape of the spindle. The rotary shaft can thereby be fixed in the mounting direction by a simple form fit.

According to a preferred embodiment, the connecting end of the movable lever is provided with an annular groove in the radial direction, the pressure piece is provided with a receiving opening for receiving the connecting end of the movable lever and a bore extending transversely to the axial direction of the movable lever through the pressure piece as far as the receiving opening, the movable lever and the pressure piece are connected by a pin extending through the bore and engaging in the annular groove, wherein the pin forms a positive-locking connection with the annular groove of the movable lever. Due to the form-fitting connection of the annular groove and the pin, the movable rod is fixedly connected with the pressure piece in the axial direction, and the movable rod can rotate relative to the pressure piece. In addition, due to the form-fit connection of the annular groove and the pin, the friction surface between the movable rod and the pressure piece is small during the rotary motion of the movable rod relative to the pressure piece, so that the rotary motion of the movable rod relative to the pressure piece can be realized in a labor-saving manner.

In order to ensure the connection of the movable rod to the pressure piece, the number of the through holes may be two or more and are preferably arranged opposite to each other.

According to a preferred embodiment, a locking groove for locking the connecting end of the movable lever in the installation direction is formed in the pressure piece, the axial contour of the connecting end of the movable lever being adapted to the contour of the locking groove. By this embodiment, the connection of the movable rod to the pressure piece is simplified.

Here, preferably, the pressing piece is a single piece, and the clamping groove extends to an edge of the pressing piece. Alternatively, the pressing block is a separate piece, and the clamping groove is located in the central area of the pressing block.

According to a preferred embodiment, the movable lever is provided with a projection which can be placed against the side of the pressure piece facing away from the key in the installation direction. The projection can additionally exert an axial force on the pressure piece in order to drive the pressure piece in the direction of the key.

According to a preferred embodiment, the support body is further provided with a stop on the side of the clamping space opposite to the side in which the spindle is inserted, configured to axially position the spindle. The shape of the stop can be designed according to the corresponding end of the rotating shaft.

Generally speaking, the device according to the exemplary embodiment can safely install the key into the key groove of the motor rotating shaft, avoids the influence on the installation precision of the encoder and further on the performance of the motor caused by knocking the installation key by using the hammer, and is simple and rapid to operate and low in cost.

Drawings

The above features, technical characteristics, advantages and modes of realisation of the present invention will be further described in the following detailed description of preferred embodiments thereof, in conjunction with the accompanying drawings. Wherein:

figure 1 schematically illustrates one implementation of an apparatus according to an exemplary embodiment,

FIGS. 2A-C schematically illustrate a first connection of the movable rod and the mass in the device according to an exemplary embodiment, in which a perspective view (A) of the movable rod and a perspective view (B) of the mass adapted to the rod are shown, respectively; a schematic sectional view (C) of the connection manner of the movable bar and the pressing block in the connected state,

figure 3 schematically shows a further implementation of the device according to an exemplary embodiment,

FIGS. 4A-C schematically illustrate a second connection of the movable rod and the mass in the device according to an exemplary embodiment, in which a perspective view (A) of the movable rod and a perspective view (B) of the mass adapted to the rod are shown, respectively; a schematic sectional view (C) of the connection manner of the movable bar and the pressure piece in the connected state.

In the figure:

1 device 10 support 10a stopper 10b holder

10c connecting piece 101 through hole 102 spacing space 103 communicating space

104 clamping space

11-pressing block 111 containing hole 112 punched hole 11a clamping groove

12a connecting end

12b protruding end 121 of movable rod 12a is provided with a circular groove 122 boss

13 pin 2 key 3 shaft 3a key groove

Detailed Description

Fig. 1 schematically shows an embodiment of a device 1 according to an exemplary embodiment for mounting a key 2 into a key slot 3a of a motor shaft extension 3. The device 1 comprises a support body 10, a pressure piece 11 and a movable rod 12. The support body 10 is constructed in one piece and has a through hole 101, a stopper space 102, a communicating space 103, a clamping space 104 arranged in this order in the mounting direction and communicating with each other. A pressure piece 11 is arranged in a limiting space 102 of the supporting body 10, wherein a movable rod 12 extends through a through hole 101 of the supporting body 10 and has a protruding end protruding from the supporting body 10 and capable of being applied with torque and a connecting end protruding into the limiting space 102 to be connected with the pressure piece 11. The spindle 3 has been mounted in the clamping space 104 of the support body 10 and the key 2 has been placed in the communication space 103 of the support body 10 but has not yet been pressed into the key slot, the clamping space 104 fixing the spindle 3 in the mounting direction M, but here for the sake of clarity a gap is left between the clamping space 104 and the spindle 3. Furthermore, the movable lever 12 has a relatively rotatable connection to the pressure piece 11 and a threaded connection to the through-opening 101. Here, the limiting space 102 is open to the outside in a direction perpendicular to the drawing plane. Here, the spacing space 102 is configured such that the pressure piece 11 is rotationally fixed in a direction perpendicular to the mounting direction M, while being translationally drivable in the mounting direction M by the movable rod 12 to effect mounting of the key 2 in the keyway 301 of the rotary shaft 3.

Fig. 2 schematically shows a first connection of the movable rod 12 and the pressure piece 11 in the device 1.

Fig. 2A shows a perspective view of the movable lever 12. The connecting end 12a of the movable rod 12 is designed here as a truncated cone. Alternatively, a cylindrical connection end is also possible.

Fig. 2B shows a perspective view of the pressure piece 11 fitted to the movable lever 12 of fig. 2A. As can be seen, a locking groove 11a is formed in the pressure piece 11, wherein the locking groove 11a of the pressure piece 11 extends to two opposing edges of the pressure piece 11 in order to facilitate the connection of the pressure piece 11 and the movable rod 12 to each other. The locking groove 11a is designed here as a truncated cone groove.

Fig. 2C is a schematic sectional view showing a connection manner of the movable bar 12 and the pressure piece 11 in the connected state. It can be seen that the axial contour of the connecting end 12a of the movable lever 12 is adapted to the matching contour of the latching groove 11a, so that the connecting end 12a of the movable lever 12 latches in the installation direction. When connecting the pressure piece 11 to the movable lever 12, the movable lever 12 is first passed through the through-opening 101, and then the pressure piece 11 is pushed with its latching groove 11a extending perpendicular to the plane of the drawing, for example, in fig. 1, into the stop space 102, so that the connecting end 12a of the movable lever 12 engages in the latching groove 11a of the pressure piece 11 exactly in the direction perpendicular to the plane of the drawing, for example, in fig. 1, in order to form a positive-locking connection.

With the key 2 and the spindle 3 mounted in place, the protruding end 12b of the movable rod 12 is rotated manually or with a tool, so that the movable rod 12 pushes the pressing piece 11 in the direction of the key 2 in the axial direction thereof, that is, the mounting direction M, and after the pressing piece 11 comes into contact with the key 2 on the side of the pressing piece 11 facing the key 2, the pressing piece 11 starts to press the key 2 into the key groove of the spindle 3 until the key 2 is completely fitted into the key groove.

Fig. 3 schematically shows a further embodiment of the device 1 according to an exemplary embodiment, wherein the bearing body 10 is of a split type, i.e. is formed from a limiting element 10a, a clamping element 10b and a connecting element 10c which fixedly connects the limiting element 10a and the clamping element 10b in the installation direction M, wherein the limiting element 10a has a through-opening 101 and a limiting space 102, and the clamping element 10b has a clamping space 104 and a communication space 103. The communicating space 103 communicates the stopper space 102 of the stopper 10a with the holding space 104 of the holding member 10 b. The connecting member 10c may be bolted to the limiting member 10a and the clamping member 10b, respectively, or alternatively, other detachable connections may be used. The sides of the stop element 10a and the clamping element 10b facing each other may be in contact with each other as shown in fig. 2, or may be at a distance from each other, as long as the pressure piece 11 is always in the stop space 102 before reaching the end position.

In the embodiment shown in fig. 4, a second connection of the pressure piece 11 to the movable lever 12 in the device 1 is schematically shown.

Fig. 4A shows a perspective view of the movable lever 12, from which it can be seen that the connecting end 12a of the movable lever 12 is provided with a radially encircling annular groove 121 and with a projection 122.

Fig. 4B shows a perspective view of the pressure piece 11 fitted to the movable lever 12 of fig. 4A. It can be seen that the pressure piece 11 is provided with a receiving opening 111 for receiving the connecting end 12a of the movable rod 12 and a bore 112 extending transversely to the axial direction of the movable rod 12. The through hole 112 extends through the pressure piece 11 up to the receiving hole 111. The pressure piece 11 is designed here in one piece, but can also be designed in two pieces.

Fig. 4C shows a schematic cross-sectional view of the pressure piece 11 and the movable lever 12 in the connected state. It can be seen that a pin 13 is inserted into this bore 112, the pin 13 extending through the pressure piece 11 and into the annular groove 121 of the movable rod 12, the pin 13 being intended to form a positive-locking connection with the annular groove 121 of the movable rod 12, so that the movable rod 12 is fixedly connected in the axial direction to the pressure piece 11, while the movable rod 12 can rotate relative to the pressure piece 11. The pin 13 may be designed to be either threaded or unthreaded with the bore 112. The number of perforations may be two or more and are preferably arranged oppositely. It can also be seen that the projection 122 rests against the side of the pressure piece 11 facing away from the key 2, which projection 122 can additionally exert an axial force on the pressure piece 11 in order to drive the pressure piece 11 in the direction of the key 2.

It should be noted that the first connection method of the movable lever and the pressing block shown in fig. 2 may be applied to the case where the apparatus 1 shown in fig. 1 has the integrated support body 10, or may be applied to the case where the apparatus 1 shown in fig. 3 has the divided support body 10. Similarly, the second connection of the movable lever and the pressure block shown in fig. 4 can be applied to the case where the apparatus 1 shown in fig. 3 has the separate-type support body 10, or to the case where the apparatus 1 shown in fig. 1 has the integrated-type support body 10.

Although exemplary embodiments have been described in the foregoing description, it should be noted that a large number of variants are possible. Furthermore, it should be noted that the exemplary embodiments described are merely examples and should not be considered as limiting the scope of protection, applicability, or configuration of the device according to the exemplary embodiments in any way. Rather, the summary and the description of the embodiments are provided to guide the person skilled in the art in the implementation of at least one exemplary embodiment, in which various modifications are possible in the function and arrangement of the elements described without departing from the scope of protection defined by the claims and the equivalent combination of features.

Claims

1. A device (1) for fitting a key (2) into a keyway (3a) of a rotating shaft (3) of an electric machine, the device (1) comprising:

a support body (10) having a through hole (101), a limit space (102), a communication space (103), and a holding space (104) which are arranged in order in the mounting direction and communicate with each other,

a pressure piece (11) arranged in a limiting space (102) of the support body (10),

a movable rod (12) extending through the through hole (101) of the support body (10) and having a torque-applicable protruding end (12b) protruding from the support body (10) and a connection end (12a) protruding into the limit space (102) to connect with the pressure piece (11),

wherein the clamping space (104) is configured to receive and fix the rotary shaft (3) in the mounting direction, the communication space is configured to receive the key (2) and to open the key groove (3a) of the rotary shaft (3) to the key (2),

wherein the movable rod (12) has a relatively rotatable connection to the pressure piece (11) and a threaded connection to the through-opening (101), the limiting space (102) being configured such that the pressure piece (11) is rotationally fixed in a direction perpendicular to the installation direction and can be driven in the installation direction by the movable rod (12) for translation in order to achieve the installation.

2. Device (1) according to claim 1, characterized in that the support body (10) is constructed in one piece.

3. Device (1) according to claim 1, characterized in that the support body (10) is constructed in two parts.

4. Device (1) according to claim 3, wherein the supporting body (10) comprises a separate retaining element (10a) and a clamping element (10b) and a connecting element (10c) for fixedly connecting the retaining element (10a) and the clamping element (10b) in the mounting direction, the retaining element (10a) having the through-opening (101) and the retaining space (102) and the clamping element (10b) having the communicating space and the clamping space (104).

5. Device (1) according to claim 1, characterized in that the clamping space (104) corresponds to the outer shape of the spindle (3).

6. Device (1) according to claim 1, characterized in that the connecting end (12a) of the movable rod (12) is provided with an annular groove (121) in the radial direction, the pressure piece (11) is provided with a receiving bore (111) for receiving the connecting end (12a) of the movable rod (12) and a through-bore (112) extending through the pressure piece (11) transversely to the axial direction of the movable rod (12) as far as the receiving bore (111), the movable rod (12) and the pressure piece (11) being connected by a pin (13) extending through the through-bore (112) and engaging in the annular groove (121), wherein the pin (13) forms a form-fitting connection with the annular groove (121) of the movable rod (12).

7. Device (1) according to claim 1, characterized in that a latching groove (11a) for latching the connecting end (12a) of the movable lever (12) in the mounting direction is formed in the pressure piece (11), the axial contour of the connecting end (12a) of the movable lever (12) being adapted to the contour of the latching groove (11 a).

8. Device (1) according to claim 7, characterized in that the pressing piece (11) is in one piece and the clamping groove (11a) extends to the edge of the pressing piece (11), or in that the pressing piece (11) is in a separate piece and the clamping groove (11a) is located in the central region of the pressing piece (11).

9. Device (1) according to claim 1, characterized in that the movable lever (12) is provided with a projection (122) which can bear in the mounting direction against a side of the pressure piece (11) facing away from the key (2).

10. Device (1) according to claim 1, characterized in that the support body (10) is further provided with a stop on the side of the clamping space (104) opposite to the side in which the spindle (3) is inserted, configured to axially position the spindle (3) accommodated in the clamping space (104).