JP4248358B2 - Connecting structure of motor and clutch / brake unit and clutch / brake unit - Google Patents

Description

  The present invention relates to a connection structure between a motor and a clutch / brake unit, and a clutch / brake unit suitable for application to this structure.

  Conventionally, for example, Patent Document 1 discloses a clutch / brake unit that is used by incorporating a clutch mechanism and a brake mechanism in a casing and connected to a motor.

  The principal part is shown in FIG.

  A pinion 6 is attached to the motor shaft 4 of the motor 2. A hollow portion 12 is formed on the input shaft 10 of the clutch / brake unit 8, and an inner tooth 14 that can mesh with the pinion 6 of the motor shaft 4 is formed on the hollow portion 12.

  The clutch / brake unit 8 includes a clutch mechanism 18 and a brake mechanism 20 in the casing 16, and the clutch mechanism 18 can connect or disconnect the input shaft 10 and the output shaft 22. The mechanism 20 can brake the rotation of the output shaft 22.

  The output shaft 22 of the clutch / brake unit 8 is formed with a pinion 23 having the same tooth shape as that of the pinion 6 of the motor shaft 4 and can mesh with an input shaft (not shown) of the speed reducer 24. With this configuration, the clutch / brake unit 8 can be interposed between the motor 2 and the speed reducer 24, and the motor 2 and the speed reducer 24 can be directly connected as necessary.

  By the way, in such a connection structure, the inner teeth 14 that can mesh with the pinion 6 on the motor shaft 4 side must be formed on the hollow portion 12 of the input shaft 10 of the clutch / brake unit 8. However, there is a problem that this processing is relatively difficult and tends to be expensive. In particular, when the pinion 6 attached to the motor shaft 4 is a special pinion such as a helical pinion, there is a problem that the formation of the internal teeth 14 becomes more difficult and expensive.

  Further, when the pinion 6 is a type of pinion that generates an axial component force (axial load) as it rotates, such as a helical pinion, the rotation of the motor shaft 4 is accelerated, decelerated, and stopped. Since the magnitude of the axial load changes and the direction in which the axial load is applied is reversed, an impact sound called a so-called “rattle noise” is generated, fretting is likely to occur, and durability is also improved. There was also a problem that it was easily lowered. In applications in which the clutch / brake unit 8 is interposed, the rotation of the motor shaft 4 is frequently accelerated, decelerated, and stopped, and this problem is particularly likely to become apparent.

  Therefore, when the pinion 6 is a pinion that generates an axial load, such as a helical pinion, an adhesive is filled between the pinion 6 and the internal teeth 14, and both the pins 6 and 14 are bonded and fixed. Is common.

  However, in this connection method, the processing of the inner teeth 14 of the hollow portion 12 of the input shaft 10 is originally difficult, and an additional bonding step is required, so that preparation and securing of an adhesive is also required, which reduces the manufacturing cost. Invited further increase. Further, once it is fixed with an adhesive, even if a request to remove the clutch / brake unit 8 and connect the motor 2 and the speed reducer 14 directly is generated, the motor 2 and the clutch / brake unit 8 There was a problem that separation was impossible.

Japanese Patent Publication No.62-2168

  The present invention has been made to solve such a conventional problem. Even when a helical pinion or the like is attached to the tip of the motor shaft, the input of the clutch / brake unit is provided. The shaft can be fixed and connected without any special inner peripheral processing and without applying adhesive, which can realize low cost, low vibration, low noise and improved durability. It is an object of the present invention to provide a motor / clutch / brake unit connection structure that can be freely connected / disconnected to / from the motor side as required, and a clutch / brake unit suitable for application to this structure. Yes.

The present invention relates to a connection structure of a motor having a pinion on a motor shaft and a clutch / brake unit having a clutch mechanism and a brake mechanism built in a casing, and the pinion is inserted into an input shaft of the clutch / brake unit. is the hollow portion is formed Rutotomoni, the end portion outer periphery of the input shaft, the stepped portion having a bottom which is smaller in diameter than the outer periphery of the input shaft, and a termination portion is larger in diameter than the bottom portion is formed By arranging a clamp ring having a slit that can be narrowed in the circumferential direction at the bottom of the stepped portion , the input shaft of the clutch / brake unit and the pinion are connected by friction engagement, It solves the problem.

  In the present invention, the concept of “an internal tooth that meshes with the pinion mounted on the motor shaft is formed in the hollow part of the input shaft of the clutch / brake unit” is separated from the idea of “friction fastening”. To connect.

  As a result, even if the pinion mounted on the motor shaft is a special type of pinion such as a helical pinion, it can be easily connected without being completely different from its tooth profile, and high-cost internal teeth The forming step is not necessary.

  Also, since the motor shaft and the input shaft of the clutch / brake unit are completely fixed and integrated in both the axial direction and the rotational direction, the situation where the magnitude and direction of the axial load changes frequently Even if it is used in the above, there will be no “rattle noise”, fretting, or durability. Further, since no adhesive or the like is used for fixing and integration, re-separation is possible.

  Further, when the present invention is viewed from the clutch / brake unit side, the state on the motor shaft side to be fastened is not particularly limited due to the characteristic of “friction fastening”. That is, the type of pinion mounted (or formed) on the motor shaft is not limited. The present invention is applicable even when the pinion itself is not mounted and is connected to the motor shaft itself.

Therefore, for example, in the case where a request to intervene a clutch / brake unit between the motor and the speed reducer later occurs with respect to the existing equipment in which the motor and the speed reducer are directly connected, The clutch / brake unit can be easily inserted regardless of the shape of the motor shaft.
Furthermore, in the present invention, the input shaft of the clutch and brake unit, the pinion is hollow portion formed to be inserted Rutotomoni, the end portion outer periphery of the input shaft, is smaller in diameter than the outer circumference of the input shaft A step portion having a bottom portion and a terminal portion having a larger diameter than the bottom portion is formed, and a clamp ring having a slit that can be narrowed in the circumferential direction is arranged at the bottom portion of the step portion. It is also possible to carry the clamp ring integrally with the clutch / brake unit by connecting the clamp ring to the step portion from the beginning. Moreover, there is no possibility that the clamp ring will inadvertently enter the casing along the input shaft.
A similar effect is that a clamp ring having a slit that can be narrowed in the circumferential direction on the outer periphery of the input shaft and having a free inner diameter smaller than the outer periphery of the input shaft is disposed. It can also be obtained by the configuration.

  According to the present invention, the configuration of the input portion of the clutch / brake unit can be simplified, and the motor and the clutch / brake unit can be freely connected and disconnected at any time regardless of the type of pinion attached to the motor shaft. Therefore, cost reduction, vibration reduction, noise reduction, and durability improvement can be realized.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 are a front view and a side view of a partially broken clutch / brake unit according to an example of an embodiment of the present invention, and FIG. 3 is an enlarged view of the vicinity of a frictional fastening member (portion III in FIG. 1). 4 is an enlarged view of the vicinity of the IV portion in FIG. 3, and FIGS. 5 and 6 are a front view and a side view showing the structure in a state where the friction fastening member is removed. In addition, the partial fracture | rupture of FIG. 1 is corresponded in the arrow II-II cross section of FIG.

  The clutch / brake unit 30 includes a clutch mechanism 34 and a brake mechanism 36 inside a casing 32 (see FIG. 5). The clutch mechanism 34 can connect or disconnect the input shaft 38 and the output shaft 40 of the clutch / brake unit 30, and the brake mechanism 36 can brake the rotation of the output shaft 40. The basic structure of the clutch mechanism 34 and the brake mechanism 36 is not particularly different from the conventional structure.

  The input shaft 38 of the clutch / brake unit 30 is formed with a hollow portion 38H into which the helical pinion 28 of the motor shaft 26 is inserted. The input shaft 38 has a slit 42 formed along the axial direction from the outer peripheral side of the input shaft 38 to the inner peripheral side of the hollow portion 38H. The inner diameter Do of the hollow portion 38H of the shaft 38 can be changed. The tip 42A of the slit 42 is subjected to circular processing to prevent stress concentration.

  On the outer periphery of the end portion of the hollow portion 38H of the input shaft 38, a stepped portion 44 is formed in a ring shape in the circumferential direction as shown in enlarged views in FIGS. The stepped portion 44 has a smooth portion 44A whose bottom portion is processed to an outer diameter d2 smaller than the outer diameter d1 of the input shaft, a boundary portion 44B slightly cut from the smooth portion 44A, and the boundary portion 44B. The terminal portion 44C is processed into an outer diameter d3 slightly larger than the outer diameter d2 of the rising smooth portion 44A. That is, d2 <d3 <d1. Although the boundary portion 44B does not necessarily have a cut shape, it is difficult to actually perform processing in which the outer diameter d3 is slightly larger than the outer diameter d2. In order to alleviate this, it is preferable to use a cut shape. A clamp ring 50 constituting the main body of the frictional fastening member is disposed so as to straddle the smooth portion 44A and the end portion 44C of the stepped portion 44. However, the step 50E corresponding to the end portion 44C of the clamp ring 50 has a step, and is not in contact with the end portion 44C (see FIG. 4). As a result, the clamp ring 50 and the input shaft 38 can come into contact with each other with the smooth portion 44A as a reference.

  The clamp ring 50 is provided with a slit 50A that can be narrowed in the circumferential direction, and has the shape of an alphabet “C” as a whole. Further, a notch 50C for screwing a bolt (not shown) is provided in a part of the outer periphery 50B, and the slit 50A can be tightened by the screwed bolt. The casing 32 is formed with a long hole 32A having an elliptical cross section for allowing the bolt to be screwed.

  The inner diameter D1 of the inner peripheral surface facing the smooth portion 44A when the clamp ring 50 is free (when not clamped by a bolt) is smaller than the outer diameter d1 of the input shaft 38 (D1 <d1). In addition to facilitating the installation of the crank ring 50 to the stepped portion 44, the crankring 50 is set to have a smaller diameter than the outer diameter d3 of the end portion 44C of the stepped portion 44 (D1 <d3).

  The output shaft 40 of the clutch / brake unit 30 is directly cut by a helical pinion 60 having the same tooth shape as that of the helical pinion 28 of the motor shaft 26.

  Reference numeral 62 in FIG. 5 is a bearing for supporting the input shaft 38, and reference numeral 64 is a retaining ring for restricting the movement of the bearing 62 in the input shaft axis direction.

  Next, the operation of the clutch / brake unit 30 according to this embodiment will be described.

  When the clutch / brake unit 30 is connected to the helical pinion 28 of the motor shaft 26, the helical pinion 28 is first inserted into the hollow portion 38 </ b> H of the input shaft 38. At this time, the clamp ring 50 may be engaged with the stepped portion 44 from the beginning, or may be engaged with the stepped portion 44 after the helical pinion 28 is inserted.

  Since the inner diameter D1 of the clamp ring 50 when it is free (not tightened by bolts) is smaller than the outer diameter d1 of the input shaft 38, the clamp ring 50 can be easily installed on the stepped portion 44. In addition, there is no risk that the crank ring 50 will inadvertently enter the casing 32 along the input shaft 38.

  Since the inner diameter D1 of the clamp ring 50 is set to be smaller than the outer diameter d3 of the terminal end portion 44C of the stepped portion 44, the clamp ring 50 is reliably prevented from falling off from the input shaft 38. It is also possible to carry the clamp ring 50 integrally with the clutch / brake unit by engaging the clamp ring 50 with the stepped portion 44 from the beginning. The clamp ring 50 is installed on the stepped portion 44 with the clamp ring 50 slightly expanded.

  In applications where the clutch / brake unit 30 is required to be mounted, the rotation, deceleration, and stop of rotation of the motor shaft 26 are frequently repeated. In the connection structure according to the present embodiment, Since the input shaft 38 of the clutch / brake unit 30 is completely integrated both in the axial direction and in the rotational direction, even if the helical pinion 28 is mounted on the motor shaft 26. There is no concern about the occurrence of problems due to the generation of axial component forces. Accordingly, there is no need for such treatment as bonding, which not only reduces the number of connecting steps, but also facilitates re-separation after assembly once.

  Since the helical pinion 60 having the same tooth shape as the helical pinion 28 formed on the motor shaft 26 is formed on the output shaft 40 of the clutch / brake unit 30, when the clutch / brake unit 30 is not mounted, the helical pinion 28 Can be directly connected to a counterpart machine such as a speed reducer (24: see FIG. 7).

  In other words, the clutch / brake unit 30 can be freely inserted between the motor and the speed reducer and can be freely removed without any adapter.

  In the present invention, when viewed from the viewpoint of the clutch / brake unit alone, the pinion inserted into the hollow portion of the input shaft is not limited to the helical pinion. Further, it is not always necessary to be a pinion, and may be a motor shaft itself. Furthermore, the drive source arranged in the preceding stage is not limited to the motor.

  The present invention is applicable when a clutch / brake unit is connected to a drive source such as a motor.

The front view of a partially broken clutch / brake unit according to an example of an embodiment of the present invention Side view Enlarged view of the clamp ring Enlarged view around arrow IV in Figure 3 Front view of a partially broken state with the clamp ring removed Side view Sectional view showing a configuration example of a conventional clutch / brake unit

Explanation of symbols

26 ... motor shaft 28 ... helical pinion 30 ... clutch / brake unit 32 ... casing 34 ... clutch mechanism 36 ... brake mechanism 38 ... input shaft 38H ... hollow portion 40 ... output shaft 42 ... slit 44 ... stepped portion 50 ... clamp ring (friction) Fastening member)
50A ... Slit

Claims (4)

In the connection structure of a motor with a pinion on the motor shaft and a clutch / brake unit with a clutch mechanism and a brake mechanism built in the casing,
The input shaft of the clutch and brake unit, the pinion is hollow portion formed to be inserted Rutotomoni, the end portion outer periphery of the input shaft, and a bottom portion smaller in diameter than the outer periphery of the input shaft, than bottom section A step portion having a terminal portion having a large diameter is formed,
By arranging a clamp ring having a slit that can be narrowed in the circumferential direction at the bottom of the stepped portion ,
A connection structure between a motor and a clutch / brake unit, wherein the input shaft of the clutch / brake unit and the pinion are connected by frictional engagement. In the connection structure of a motor with a pinion on the motor shaft and a clutch / brake unit with a clutch mechanism and a brake mechanism built in the casing,
On the input shaft of the clutch / brake unit, a hollow portion is formed into which the pinion is inserted,
A clamp ring having a slit that can be narrowed in the circumferential direction on the outer periphery of the input shaft , and having a free inner diameter set smaller than the outer periphery of the input shaft ,
A connection structure between a motor and a clutch / brake unit, wherein the input shaft of the clutch / brake unit and the pinion are connected by frictional engagement. In the clutch and brake unit, which is built in the casing and includes a clutch mechanism and a brake mechanism and is connected to the drive source.
A hollow portion into which an output shaft of the driving source or a pinion provided on the output shaft can be inserted is formed on the input shaft, and
On the outer periphery of the end portion of the input shaft, a step portion having a bottom portion having a smaller diameter than the outer periphery of the input shaft and a terminal portion having a larger diameter than the bottom portion is formed,
The bottom portion of the stepped portion has a slit that can be narrowed in the circumferential direction, and is equipped with a friction fastening member that can clamp the output shaft of the drive source or a pinion provided on the output shaft. Clutch / brake unit. In the clutch and brake unit, which is built in the casing and includes a clutch mechanism and a brake mechanism and is connected to the drive source.
A hollow portion into which an output shaft of the driving source or a pinion provided on the output shaft can be inserted is formed on the input shaft, and
The outer periphery of the input shaft, a pinion inner diameter of the free state is provided in the output shaft or output shaft of the driving source is smaller than the outer periphery of the input shaft and having a Semachijimi capable slits in the circumferential direction A clutch and brake unit equipped with a clampable friction fastening member.

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