JPH0711875U - Servo motor with rotation detector - Google Patents

Abstract

(57) [Summary] [Structure] The anti-load side end portion 31 of the rotary shaft 3 protruding from the anti-load side bracket 2 of the servomotor 1 and the rotation portion 41 of the rotation detector 4 fixed to the anti-load side end portion 31. And a ring-shaped leaf spring 5 having an axially elastic portion that connects the anti-load side bracket 2 and the fixed portion 43 of the rotation detector 4 to each other. A protrusion formed by axially projecting the insertion hole 51 of the screw 6 fixed to the side bracket 2 and the fixing portion 43 and the insertion hole 51 of the screw 6 fixed to either or both of the anti-load side bracket 2 and the fixing portion 43. The portion 52 and the flat spring portion 53 are provided between the insertion holes 51. [Effect] It is possible to provide a servomotor with a rotation detector that has a simple structure and can reduce the number of assembly and processing steps.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a servomotor with a rotation detector in which a rotation detector is integrally mounted on the anti-load side.

[0002]

[Prior art]

 Conventionally, a servomotor with a rotation detector has a servomotor and a rotation detector so that the coupling between the servomotor and the rotation detector does not allow displacement in the rotation direction but only displacement in the axial direction. Japanese Patent Laid-Open No. 2-42068 discloses a method in which the above are coupled via a leaf spring. That is, for example, as shown in FIG. 5, the anti-load side end portion 31 of the rotary shaft 3 is projected from the anti-load side bracket 2 of the servo motor 1, and the anti-load side end portion 31 has the anti-load side end portion 31 with the rotating portion 41 of the rotation detector 4. The hollow shaft 42 to which is fixed is fitted and fixed. The fixed portion 43 including the light emitting portion, the light receiving portion, the printed circuit board and the like of the rotation detector 4 is supported by the hollow shaft 42 via a bearing 44. The fixing portion 43 of the rotation detector 4 is mounted on the anti-load side bracket 2 via a ring-shaped leaf spring 5 having an elastic portion in at least a part thereof at positions equidistantly spaced in the circumferential direction. It is fixed by 6. When the leaf spring 5 is fixed to the anti-load side bracket 2 and the fixed portion 43, a spacer 7 or the like is inserted between the leaf spring 5 and the anti-load side bracket 2 and the fixed portion 43, and the leaf spring 5 and the anti-loaded side are inserted. A space is provided between the bracket 2 and the fixed portion 43. In addition, instead of inserting the spacer 7, there is one in which a protrusion protruding in the axial direction is provided on each end surface of the anti-load side bracket and the fixed portion that face each other, and the leaf spring is fixed to the protrusion (for example, Japanese Patent Publication No. 3-53564).

[0003]

[Problems to be solved by the device]

 However, in the former conventional technology, a spacer is inserted to provide a gap between the anti-load side bracket and the leaf spring and between the fixed part of the rotation detector and the leaf spring, so the number of parts increases. However, there is a drawback that it takes a lot of assembly man-hours. Also, in the latter prior art, the structure of the fixed part of the anti-load side bracket and the rotation detector becomes complicated, and the die cast mold becomes complicated when the fixed part is made by die casting etc. There were problems such as equipment costs becoming expensive. It is an object of the present invention to provide a servomotor with a rotation detector that has a simple structure and can reduce the number of assembly / processing steps and equipment costs.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides an anti-load side end portion of a rotary shaft protruding from an anti-load side bracket of a servo motor, a rotation part of a rotation detector fixed to the anti-load side end portion, and A servomotor with a rotation detector, comprising a ring-shaped leaf spring that connects an anti-load side bracket and a fixed portion of the rotation detector to each other, wherein the leaf spring is attached to the anti-load side bracket. And a screw insertion hole that is fixed to the fixing portion, and a protrusion that axially protrudes around the insertion hole of the screw that is fixed to the anti-load side bracket and / or the fixing portion. It is a thing.

[0005]

[Action]

 By means of the above means, the leaf spring is formed with a protruding portion formed by axially projecting the periphery of the insertion hole of the screw fixed to the anti-load side bracket and the fixed part of the rotation detector by press working, etc. A flat spring portion is formed between them. Therefore, when the leaf spring is fixed to the anti-load side bracket and the fixed part, a gap can be maintained between the end face of the anti-load side bracket and the fixed part and the spring part by the height of the protrusion, and the spacer Does not need

[0006]

【Example】

 The present invention will be described with reference to the embodiments shown in the drawings. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which a leaf spring 5 is attached to a fixing portion 43. In the drawing, the anti-load side end portion 31 of the rotary shaft 3 is projected from the anti-load side bracket 2 of the servo motor 1, and the hollow shaft 42 to which the rotary portion 41 of the rotation detector 4 is fixed is fixed to the anti-load side end portion 31. The fixed portion 43 of the rotation detector 4 is fitted and fixed, and is supported by the hollow shaft 42 through a bearing 44. The anti-load side bracket 2 is provided with a ring-shaped leaf spring 5 having an elastic portion in the axial direction. The structure in which the fixed portions 43 of the rotation detector 4 are fixed by screws 6 at positions at substantially equal intervals in the circumferential direction is almost the same structure as the conventional example shown in FIG. Reference numeral 45 is an escape hole for passing a driver or the like when fixing the leaf spring 5 to the anti-load side bracket 2 with a screw 6, and 11 is a cover for covering the rotation detector 4, which is different from the conventional example. It is a point. That is, the leaf spring 5 is provided with two insertion holes 51 for inserting the screws 6 for fixing to the anti-load side bracket 2 and the fixing portion 43 of the rotation detector alternately on the same pitch circle. The periphery of each insertion hole 51 that contacts the bracket 2 on the non-load side and the fixed portion 43 is alternately protruded in the opposite axial direction by press working or the like to form the protrusion 52 (52a, 52b). A flat plate-shaped spring portion 53 that can be displaced in the axial direction is formed between the 51. Therefore, when the leaf spring 5 is fixed to the anti-load side bracket 2 and the fixing portion 43, a gap is formed between the end surface of the anti-load side bracket 2 and the fixing portion 43 and the spring portion 53 by the height of the protruding portion 52. Can be maintained. Further, the end face of the fixed portion 43 of the rotation detector 4 may be formed in a flat shape, and the leaf spring 5 has the protruding portion 52 formed by press working which requires a small number of working steps, a simple mold and easy mass production. Therefore, the processing man-hours and equipment costs are low, and the structure that allows the axial displacement of the leaf spring 5 does not require a spacer, etc., and the number of parts is small, and the assembly is easy and simple. You can If a protrusion that can be used to mount the leaf spring 5 is provided on either the anti-load side bracket 2 or the fixed portion 43, the area around the insertion hole of the screw fixed to the protrusion is provided. The protrusion may be omitted. Further, in the above-described embodiment, an example in which two insertion holes 51 for the leaf spring 5 for fixing to the anti-load side bracket 2 and the fixing portion 43 are provided respectively, but the number of the insertion holes 51 is two, respectively. The number is not limited, and two or more may be provided at equal intervals on the pitch circle. Further, in the above embodiment, an example in which the insertion holes 51 are provided on the same pitch circle has been described, but as shown in FIG. 3, the insertion hole 51a for fixing to the anti-load side bracket 2 and the rotation detector 4 are fixed. It may be provided on a pitch circle different from the insertion hole 51b for fixing to the portion 43. Further, for example, when the diameter of the pitch circle of one of the insertion holes 51b is small, a plurality of insertions are made in one protrusion 52b protruding around the hole through which the rotary shaft 3 at the center of the leaf spring 5 penetrates. The hole 51b may be provided. In this case, a part of the spring portion 53 becomes a curved surface. Further, in the case of providing one protruding portion 52b in which the central portion of the leaf spring 5 is protruded, the spring portion 53 is lifted from the surface of the insertion hole 51a as shown in FIG. It is possible to displace in the axial direction without projecting the periphery. Therefore, it is not necessary to form a protruding portion around the insertion hole 51a, and the plate can be formed in a flat plate shape, and the end surface of the anti-load side bracket 2 can be formed in a flat plate shape. In the above-described embodiment, the anti-load side end 31 of the rotary shaft 3 is formed as a straight shaft and the hollow shaft 42 of the rotation detector 4 is fitted and fixed. The hollow shaft 42 may be fitted and fixed by taper connection. In this case, since the torque transmission path from the servo motor 1 to the rotation detector 4 can be completely integrated, the rotation of the servo motor 1 can be detected with high accuracy.

[0007]

[Effect of device]

 As described above, according to the present invention, the fixing spring is provided between the anti-load side bracket of the servo motor and the fixed portion of the rotation detector, and the fixing spring is inserted with the fixing screw. Of the insert hole is formed by axially projecting by pressing or the like to form a protruding part, and a flat spring part is formed between the insert holes, so that the bracket on the non-load side and the fixing part are fixed. Since the space is maintained between the end face and the spring part, it is not necessary to insert a spacer separately and it is not necessary to provide a protrusion on the end face of the anti-load side bracket and the fixed part, so the structure is There is an effect that it is possible to provide a servo motor with a rotation detector that is simple and can reduce the assembly and processing man-hours. Further, since the end portion of the rotation shaft of the servo motor on the side opposite to the load and the rotation portion of the rotation detector are fitted and fixed by taper coupling, the rotation of the servo motor can be detected with high accuracy.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a fixed portion and a leaf spring of the rotation detector of the present invention are fixed to each other.

3 (a) is a front view and FIG. 3 (b) is a side sectional view taken along the line AA, showing another embodiment of the leaf spring of the present invention.

4 (a) is a front view and FIG. 4 (b) is a side sectional view taken along the section A'-A 'showing another embodiment of the leaf spring of the present invention.

FIG. 5 is a side sectional view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 servo motor, 2 anti-load side bracket, 3 rotation shaft, 31 anti-load side end part, 4 rotation detector, 41 rotation part, 42 hollow shaft, 43 fixed part, 44 bearing, 5 leaf spring, 51 insertion hole, 52 Projection part, 53 Spring part, 6
screw

Claims (2)

[Scope of utility model registration request] 1. An anti-load side end portion of a rotary shaft protruding from an anti-load side bracket of a servo motor, a rotation portion of a rotation detector fixed to the anti-load side end portion, the anti-load side bracket, and the rotation. In a servomotor with a rotation detector, which comprises a ring-shaped leaf spring that is coupled to a fixed portion of a detector and has an elastic portion in the axial direction, a screw fixed to the anti-load side bracket and the fixed portion of the leaf spring. With a rotation detector, and a projection part that axially projects the circumference of the insertion hole of the screw fixed to both or one of the anti-load side bracket and the fixing part. Servomotor. 2. The servomotor with a rotation detector according to claim 1, wherein an end portion of the rotation shaft of the servomotor on the side opposite to the load is fixed to the rotation portion of the rotation detector by taper coupling.