JP4878458B2 - Geared motor - Google Patents

Description

  The present invention relates to a geared motor such as a hypoid gear type.

  A hypoid gear type geared motor is known in Japanese Patent Laid-Open No. 2000-274493 (Patent Document 1). The Patent Document 1 includes a motor portion having a motor shaft provided with a hypoid pinion and a bracket that supports the motor shaft, and a pair of casing members that can be separated in a predetermined direction. There is described a hypoid gear type geared motor comprising a hypoid gear meshing with the hypoid pinion by a casing member and a reduction gear provided with a gear case for rotatably supporting an output shaft driven to rotate by the hypoid gear.

JP 2000-274493 A

  The geared motor is composed of a motor part and a speed reducer part, and is provided on a pinion (bevel gear) provided at the tip of the rotating shaft of the motor part and an intermediate shaft connected to the output shaft via a gear group. A gear (bevel gear) is engaged with each other to transmit the rotational power of the rotary shaft to the intermediate shaft. By the way, the assembly accuracy of the pair of bevel gears greatly affects the performance (allowable transmission power, life, noise, etc.) when the bevel gears transmit power. In recent years, the machining accuracy of machine tools has improved, and the accuracy of individual bevel gears has also improved. However, as a geared motor for actually transmitting power, components such as frames and bearings that constitute the geared motor Accumulation of various components such as the accuracy of the component and the assembly accuracy of the components affect the accuracy, so the assembly accuracy as one component of the geared motor is not dependent on the accuracy of the bevel gear alone. Adjustment work to obtain However, as described above, since the accuracy of each element (part) constituting the geared motor is affected, in general, the geared motor is temporarily assembled and the umbrella including the accuracy of each component and the accuracy of assembly is included. Adjustment of the assembly accuracy of the bevel gear requires considerable effort, such as checking the meshing state of the gear, performing adjustment according to the result, and repeating the adjustment operation until the required accuracy is obtained.

  An object of the present invention is to solve the above-mentioned problems by simplifying the labor required for adjustment work, so that no skill is required and a pinion (bevel gear) and a gear (bevel gear) required in a shorter time It is an object of the present invention to provide a geared motor and its assembling adjustment method capable of obtaining the above-described meshing assembly accuracy.

  In order to achieve the above object, the present invention provides a geared motor that includes a motor unit and a reduction gear unit, and that decelerates the rotational force of the rotation shaft of the motor unit in the reduction gear unit and transmits it to the output shaft. The axial direction of the rotating shaft of the motor unit and the axial direction of the intermediate shaft provided in the speed reducer unit are orthogonal to each other (including the case where they are orthogonal with an offset like a hypoid gear type geared motor). A pinion (bevel gear) provided at the tip of the rotating shaft and a gear (bevel gear) provided on the intermediate shaft are meshed to transmit rotational force to the intermediate shaft, and the rotation As a mechanism for finely adjusting the shaft in the axial direction with respect to the housing of the motor unit, a bearing for supporting the rear end side of the rotating shaft can be finely adjusted in the axial direction with respect to the housing of the motor unit. The intermediate shaft is connected to the speed reducer As a mechanism that can be finely adjusted in the axial direction with respect to the housing of the present invention, a bearing that supports one end of the intermediate shaft can be finely adjusted in the axial direction with respect to the housing of the reduction gear unit. .

  The present invention also provides a geared motor having a motor unit and a speed reducer unit, wherein the rotational force of the rotating shaft of the motor unit is decelerated in the speed reducer unit and transmitted to the output shaft. And the axial direction of the intermediate shaft provided in the speed reducer section are orthogonal to each other (including the case where they are orthogonal to each other with an offset like a hypoid gear type geared motor), and the rotational force of the rotating shaft is converted to the intermediate shaft. The pinion provided at the tip of the rotating shaft and the gear provided at the intermediate shaft are meshed so that the rotating shaft is connected to the housing on the rear end side of the motor unit. As a mechanism for fine adjustment in the axial direction, the housing holding the bearing that supports the rear end side of the rotating shaft is finely adjusted in the axial direction by a screw mechanism with respect to the housing (end bracket) on the rear end side of the motor unit. to be able to do And a housing holding a bearing for supporting one end side of the intermediate shaft as a mechanism capable of finely adjusting the intermediate shaft in an axial direction with respect to a housing on one end side of the reduction gear portion. It is characterized in that it can be finely adjusted in the axial direction by a screw mechanism with respect to the casing (casing).

  Further, the present invention is characterized in that in the geared motor, a bearing that supports the tip end side of the rotating shaft is provided on a partition member that partitions the motor portion and the speed reducer portion.

  In the geared motor according to the present invention, the pinion and the gear are formed with a hypoid.

  By the way, in order to make the description clearer, for the sake of convenience, one pinion (bevel gear) is connected to the pair of pinions (bevel gear) and gear (bevel gear) with the bevel gear A and the other gear (bevel gear). The bevel gear B is assumed.

  Considering the assembled state of the bevel gear, the factors constituting the accuracy include the positional relationship between the bevel gear A and the bevel gear B, as well as the rotational center axes of the bevel gear A and the bevel gear B ( The angle formed by each rotation center axis, etc. In addition, in the case of a bevel gear such as a hypoid gear where the rotation center axes do not intersect each other, the distance (offset amount) of the rotation center axis is also included) and the rotation of the bevel gear A The distance at which the bevel gear B is assembled from the center of the shaft, conversely, the distance at which the bevel gear A is assembled from the center of the rotation shaft of the bevel gear B (hereinafter referred to as the assembling distance), and further, the rotating shaft and bearing for supporting these bevel gears Accuracy of the frame of the gear box, etc. Among these factors, the shaft angle formed by the rotation center of the bevel gear A and the bevel gear B and the offset amount are determined by the accuracy (machining accuracy, etc.) of the rotation shaft and frame that support them. What can be adjusted by assembling the gear is the adjustment of the assembling distance. The adjustment of the assembling distance may allow a slight error of several microns to several tens of microns when high accuracy is required, and is a portion having a considerable man-hour in the assembly work of the gear box.

  Therefore, if it is possible to adjust the assembly distance of the bevel gear A and the bevel gear B from outside the geared motor after the geared motor is assembled, the geared motor can be assembled without worrying about the accuracy of the assembly distance. In practice, it is possible to adjust the assembling distance in a state including the error of each element constituting the geared motor, and at the same time, it is possible to save troubles such as readjustment and reassembly. In addition, there is no need to worry about assembly errors due to reassembly.

  According to the present invention, in a geared motor, the man-hours required for adjusting the assembly accuracy of a pinion (bevel gear) provided at the tip of the rotating shaft and a gear (bevel gear) provided at the intermediate shaft can be reduced. By reducing as much as possible, the cost can be reduced in various aspects such as labor costs, accuracy measuring tools, adjustment time, etc., and the skill of the adjustment is not required, and the required man-hours are further reduced. Also, a reduction in the probability of assembly failure or the like can be expected.

  An embodiment of a geared motor according to the present invention will be described with reference to the drawings.

  FIGS. 1A and 1B are structural views showing an embodiment of a hypoid gear type geared motor which is a geared motor according to the present invention.

  In the hypoid gear type geared motor according to the present invention, as shown in FIG. 1A, the motor part 1 and the speed reducer part 2 are partitioned by a partition member 3. The motor unit 1 includes a rotating shaft 4 supported at both ends, a rotor 5 provided around a position on the rotating shaft 4, a stator 6 disposed in the outer circumferential direction of the rotor 5, and the periphery of the stator 6. And a casing 7 surrounding the casing. An end bracket 9 for supporting the rear end side opposite to the output side (front end side) of the rotating shaft 4 via the bearing 8 of the assembly position adjusting mechanism A portion of the bevel gear is attached to the opening of one end of the casing 7. It is done. That is, at the center portion of the end bracket 9, the bevel gear assembly position adjusting mechanism A section is provided so that the assembly position adjustment of the bevel gear 11 can be performed with accuracy of several microns to several tens of microns with the geared motor assembled. Will be provided. A partition member 3 that supports the output side (front end side) of the rotating shaft 4 via a bearing 10 is attached to the opening at the other end of the casing 7. A first pinion 11 made of, for example, a hypoid is formed at an output end portion (tip portion) located on the speed reducer portion 2 side of the rotating shaft 4. Therefore, the bearing 10 that supports the distal end side of the rotating shaft 4 is installed at a position from the motor portion 1 of the partition member 3.

  The speed reducer unit 2 has a first gear 12 made of, for example, a hypoid that meshes with a first pinion 11 provided at the tip of the rotating shaft 4, and both ends of the assembly position adjusting mechanism B unit of the bevel gear. An intermediate shaft 13 that is rotatably supported by a bearing 18 and a bearing 19 provided in the casing 17, and a second gear 15 that meshes with a second pinion 14 provided at an intermediate position of the intermediate shaft 13. And an output shaft 16 rotatably supported by bearings 21 and 22 provided in the casing 17 at both ends, and a casing 17 surrounding them. On one side of the intermediate shaft 13, the bevel gear assembly position adjustment mechanism B section is provided so that the assembly position adjustment of the bevel gear 12 can be performed with accuracy of several microns to several tens of microns with the geared motor assembled. Will be provided.

  Furthermore, the partition member 3 is attached to one end opening of the casing 17, and the output shaft 16 is inserted into the other end of the casing 17.

  The partition member 3 is inserted through the distal end portion of the rotating shaft 4, closes the other end opening portion of the casing 7 and the opening portion of the casing 17, and partitions between the motor portion 1 and the speed reducer portion 2. Yes.

  Further, in the space 18 defined by the partition member 17 and the casing 17, a gear group such as the first gear 12, the second pinion 14, the second gear 15, and the first pinion 11 are lubricated. Lubricating oil is enclosed. Between the partition member 3 and the shaft portion of the rotary shaft 4, an oil seal 23 and a shielding member 24 that shields the space on the speed reducer portion side of the oil seal 23 and the inside of the speed reducer portion 2 are provided.

  In addition, the axial direction of the rotating shaft 4 and the axial direction of the intermediate shaft 13 are disposed so as to be orthogonal in the state shown in FIGS. Further, when the first pinion 11 and the first gear 12 are hypoids, the hypoid gear 12 is configured to mesh with the hypoid pinion 11 with an offset α as shown in FIG. .

  Therefore, when the rotating shaft 4 of the motor unit 1 is driven, the rotational force of the rotating shaft 4 is a gear group composed of the first pinion 11 to the first gear 12, the second pinion 14, and the second gear 15. And is transmitted to the output shaft 16 through deceleration. That is, the power transmission between the intermediate shaft 13 and the output shaft 16 is not limited to the configuration shown in FIG.

  Next, the assembly position adjustment method and mechanism of the bevel gear in the geared motor, which is a feature of the present invention, will be described with reference to FIG. 1, FIG. 2, and FIG.

  FIG. 2 is an enlarged view of portions A and B of the bevel gear assembly position adjusting mechanism in the geared motor shown in FIG. One bevel gear assembly position adjusting mechanism A part is an opening formed in the center part of the end bracket 9 constituting the motor part 1 and having a female thread 32 having a pitch of about 0.2 to 0.3 mm. 30 and the outer ring portion of the bearing 8 that supports the rear end of the rotating shaft 4 are fixed (held), the outer periphery thereof is threaded, and the rotating shaft 4 can be finely moved in the direction of the arrow 35 in the opening 30. A housing 31 having a screw mechanism for screw fitting and a cover member 33 for fixing and sealing the housing 31 to the end bracket 9 after the assembly adjustment of the bevel gear 11 is completed. In the assembly work, the housing 31 that fixes (holds) the outer ring portion of the bearing 8 that supports the rear end of the rotary shaft 4 is screwed (screwed) into the opening 30 formed in the center of the end bracket 9. Thus (screw mechanism), the first pinion 11, the rotary shaft 4 and the bearing 8 are assembled as one unit (hereinafter referred to as unit A) of the geared motor.

  The assembly position adjusting mechanism B of the other bevel gear has a female thread processing 42 formed on one end side of the intermediate shaft 13 of the casing 17 constituting the reduction gear unit 2 and having a pitch of about 0.2 to 0.5 mm. The above-described opening 40 and the outer ring portion of the bearing 18 that supports one end of the intermediate shaft 13 are fixed (held), and the outer periphery is subjected to male threading so that the intermediate shaft 13 can be finely moved in the arrow direction 45. The housing 41 includes a screw mechanism that is screwed into the opening 40, and a lid member 43 that fixes and seals the housing 41 to the casing 17 after the assembly adjustment of the bevel gear 12 is completed. In the assembling work, the housing 41 that fixes (holds) the outer ring portion of the bearing 18 that supports one end of the intermediate shaft 13 is screwed (screwed) into the opening 40 formed on one end side of the intermediate shaft 13 of the casing 17. ) (Screw mechanism), the first gear 12, the intermediate shaft 13, and the bearing 18 are assembled as one unit (hereinafter referred to as unit B) of the geared motor.

  That is, in the assembly work of the geared motor, the unit A is assembled with the threaded portion 32 of the opening 30 of the end bracket 9 in an integrated state with the housing 31, and the unit B is integrated with the housing 41 in the casing. 17 to the threaded portion 42 of the opening 40. At this time, the positional relationship of the housing 31 with respect to the end bracket 9 and the positional relationship of the housing 41 with respect to the casing 17 are determined by how much the housings 31 and 41 are screwed. Further, since the first pinion (bevel gear) 11 and the first gear (bevel gear) 12 are part of the unit A and B that are integrated, the end bracket (housing) 9 and the casing (housing). That the positional relationship between the body 17 and the housings 31 and 41 is determined because the end bracket 9 and the casing 17 represent a part of the same geared motor, and the positional relationship between the end bracket 9 and the casing 17 is determined. Since the housings 31 and 41 can be screwed and assembled to determine the positional relationship, the positional relationship between the first pinion 11 and the first gear 13 is also determined.

  In other words, when trying to finely adjust the positional relationship between the first pinion 11 and the first gear 12 so that the required performance is sufficiently exhibited, the screwed amount of the housings 31 and 41 is reduced to 0. Fine adjustment to about 3 mm or less and fine adjustment of the assembly positions of the units A and B, that is, the first pinion (bevel gear) 11 and the first gear (bevel gear) 12 in the directions of 35 and 45 may be performed. Therefore, the housing 41 can be removed from the casing (housing) even after the parts inside the geared motor are assembled without taking the trouble of disassembling the geared motor housing and adjusting the assembly position inside the housing. ) The intermediate shaft 13 is finely moved in the axial direction 45 by screwing into the opening 40 of the 17, and the rotary shaft 4 is finely moved in the axial direction 35 by screwing the housing 31 into the opening 30 of the end bracket (housing) 9. In addition, the assembly position of the first pinion (bevel gear) 11 and the first gear (bevel gear) 12 can be finely adjusted. When the housing 41 is screwed into the opening 40 of the casing (housing) 17, the bearing 19 fixed to the intermediate shaft 13 slightly moves in the axial direction with respect to the casing 17, so that the intermediate shaft 13 moves in the axial direction. It will be slightly moved. When the housing 31 is screwed into the opening 30 of the end bracket (housing) 9, the bearing 10 fixed to the rotating shaft 4 finely moves with respect to the partition member 3, so that the rotating shaft 4 is pivoted. The rotating shaft 4 slightly moves in the axial direction by finely moving with respect to the partition member 3 in the direction 35. Since 11 is a pinion and 12 is a gear, the fine adjustment amount of the rotary shaft 4 can be larger than the fine adjustment amount of the intermediate shaft 13. Therefore, it is preferable to adjust the intermediate shaft 13 at the beginning and make the final fine adjustment on the rotating shaft 4.

  In addition, fine adjustment after assembly by the above method also means fine adjustment in the state that the parts that affect the accuracy related to the assembly position are assembled. Unlike the assembling procedure, fine adjustments are made with the accuracy of various parts taken into account, so that the influence of assembly errors can be suppressed to the limit.

  Further, in the above assembling position adjustment, a structure using a housing is adopted. However, the same effect can be obtained as long as a fine adjustment amount by a screw can be secured.

  Next, the procedure for adjusting the assembly position of the geared motor according to the present invention will be described with reference to FIG. First, the housing (first screw) 41 is turned (S31), and it is determined whether a specified value is reached (S32). If it is determined that the specified value has been reached, then the housing (second screw) 31 is turned (S33), and it is determined whether the specified value has been reached (S34). If it is determined that the specified value has been reached, the housings 41 and 31 are fastened with the lid members 43 and 33 and fixed to the housings 9 and 17, and the assembly position adjustment of the geared motor is completed. Thus, according to the present invention, it can be easily adjusted because the geared motor can be adjusted in the assembled state. The determination as to whether the value has reached the specified value is made by examining the sound generated from the meshing portion after actually operating.

  In the present invention, the expression “screw in” is used when assembling the housing, but this includes both the operation of tightening the screw and the operation of loosening it. Furthermore, although the expressions “assembly position” and “assembly accuracy” are used, it is added that both are used as consent.

  According to the present invention, in a geared motor that decelerates high-speed rotation of a motor and outputs rotational power, it is easy to adjust the assembly position that can exhibit the performance required by the pair of bevel gears in the rotational power transmission mechanism in the speed reducer section. It becomes possible to.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows one Embodiment of the hypoid gear type geared motor which is one of the geared motors concerning this invention, (a) is a front fragmentary sectional view, (b) is a plane fragmentary figure. It is detail drawing which expands and shows the assembly position adjustment mechanism A part and B part of the bevel gear shown to Fig.1 (a), (a) is a figure which shows a cover member, (b) is the assembly position of a bevel gear It is detail drawing of the adjustment mechanism A part and B part. It is a flowchart figure which shows the assembly position adjustment procedure of the bevel gear in the geared motor which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor part, 2 ... Reduction gear part, 3 ... Partition member, 4 ... Rotary shaft, 5 ... Rotor, 6 ... Stator, 7 ... Casing, 8 ... Bearing, 9 ... End bracket (housing), 10 ... Bearing, DESCRIPTION OF SYMBOLS 11 ... 1st pinion (bevel gear), 12 ... 1st gear (bevel gear), 13 ... Intermediate shaft, 14 ... 2nd pinion, 15 ... 2nd gear, 16 ... Output shaft, 17 ... Casing ( Casing), 18 ... bearing, 19 ... bearing, 21, 22 ... bearing, 23 ... oil seal, 24 ... shielding member, 30 ... opening, 31 ... housing, 32 ... screw processing part, 33 ... lid member, 40 ... opening 41 ... Housing, 42 ... Screw processing part, 43 ... Lid member.

Claims (3)

In a geared motor that has a motor part and a speed reducer part and decelerates the rotational force of the rotating shaft of the motor part in the speed reducer part and transmits it to the output shaft,
The rotational force of the rotation shaft of the motor unit to transfer to the intermediate shaft provided in the reduction gear portion, and a bevel gear provided on the rotating shaft bevel gear and the intermediate shaft provided at the distal end of the Mesh and configure
On one end portion side of the rotating shaft, there is a bearing that supports one end portion of the rotating shaft, and a housing that holds an outer ring portion of the bearing and is threaded on the outer periphery, A rotary shaft position in which the housing on one end side of the rotary shaft of the applied motor part and the housing are screwed to form a screw mechanism, and the rotary shaft is adjusted in the axial direction by the screw mechanism Provide an adjustment mechanism,
A bearing that supports one end of the intermediate shaft on one end side of the intermediate shaft, and a housing that holds an outer ring portion of the bearing and is threaded on the outer periphery thereof, An intermediate shaft in which the housing on one end side of the intermediate shaft of the speed reducer portion and the housing are screwed together to form a screw mechanism, and the intermediate shaft is axially adjusted by the screw mechanism A geared motor comprising a position adjusting mechanism. The geared motor according to claim 1, wherein
The rotating shaft position adjusting mechanism is provided in a housing of the motor unit,
The geared motor, wherein the intermediate shaft position adjusting mechanism is provided in a housing of the speed reducer section. In a geared motor that has a motor part and a speed reducer part and decelerates the rotational force of the rotating shaft of the motor part in the speed reducer part and transmits it to the output shaft,
The pinion provided at the tip of the rotating shaft and the gear provided on the intermediate shaft are meshed so that the rotational force of the rotating shaft of the motor portion is transmitted to the intermediate shaft provided in the speed reducer portion. And configure
On one end portion side of the rotating shaft, there is a bearing that supports one end portion of the rotating shaft, and a housing that holds an outer ring portion of the bearing and is threaded on the outer periphery, Rotating shaft position adjustment for forming a screw mechanism by fitting the housing on one end side of the rotating shaft of the applied motor part with the housing, and adjusting the position of the rotating shaft in the axial direction by the screw mechanism Provided a mechanism,
A bearing that supports one end of the intermediate shaft on one end side of the intermediate shaft, and a housing that holds an outer ring portion of the bearing and is threaded on the outer periphery thereof, An intermediate shaft position in which the housing on one end side of the intermediate shaft of the speed reducer unit and the housing are fitted to form a screw mechanism, and the intermediate shaft is adjusted in the axial direction by the screw mechanism Provide an adjustment mechanism,
A lid member for fixing the housing of the rotating shaft position adjusting mechanism to a housing on one end side of the rotating shaft of the motor unit and closing an opening formed on the housing on one end side of the rotating shaft; ,
A lid member that fixes a housing of the intermediate shaft position adjusting mechanism to a housing on one end side of the intermediate shaft of the speed reducer unit and closes an opening formed in the housing on one end side of the intermediate shaft And a geared motor.

Images