Motor

Abstract

To reduce the risk of occurrence of abnormal noise based on vibrations when a motor 1 is driven, in the motor 1 having a structure in which a terminal cover 16 is attached to a motor case 11.SOLUTION: The motor 1 comprises: the cylindrical motor case 11 for housing a rotor 7 and a stator 9 therein; the terminal cover 16 attached to an outer periphery 2 of the motor case 11; an insertion part 4 provided on the motor case 11; and an inserted part 5 provided on the terminal cover 16, wherein the terminal cover 16 is attached to the motor case 11 with the insertion part 4 of the motor case 11 pressed into the inserted part 5.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a motor, and more particularly to a motor having a structure in which a terminal cover is attached to a motor case. [Background technology]

[0002] A prior art document for this type of motor is Patent Document 1. Patent Document 1 discloses a motor having a structure in which a terminal cover is attached to a motor case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] CN218449655U Summary of the Invention [Problem to be solved by the invention]

[0004] In a motor having a terminal cover attached to a motor case, the motor case and the terminal cover may be connected with a clearance between them. In this case, when the motor is driven and vibration occurs, the vibration is transmitted separately to the parts of the motor case and the terminal cover that face each other through the clearance, and the parts vibrate separately and collide with each other, which may cause abnormal noise.

[0005] An object of the present invention is to reduce the risk of abnormal noise caused by vibrations during motor operation in a motor having a structure in which a terminal cover is attached to a motor case. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, one aspect of the motor of the present invention comprises a cylindrical motor case that houses a rotor and a stator inside, a terminal cover attached to the outer periphery of the motor case, an insertion portion provided on the motor case, and an inserted portion provided on the terminal cover, and the terminal cover is attached to the motor case with the insertion portion of the motor case pressed into the inserted portion.

[0007] According to this aspect, the terminal cover is attached to the motor case with the inserting portion of the motor case pressed into the receiving portion. That is, since the inserting portion is pressed into the receiving portion, the vibration of the motor is not transmitted to the receiving portion and the inserting portion separately, but vibrates as a unit, thereby reducing the risk of abnormal noise. Also, since the inserting portion is pressed into the receiving portion, the two portions are firmly in contact with each other due to the repulsive force caused by the press-fitting. This allows the terminal cover to be held with less risk of being displaced by the motor case.

[0008] The present invention is also characterized in that, in the motor of the above-mentioned aspect, the inserted portion comprises a root portion protruding from the surface of the cover body of the terminal cover, and an arm portion extending from the tip of the root portion along the surface of the cover body and at a distance from the surface, and the arm portion is a tip portion in the direction extending from the root portion, and the distance between the contact surface that comes into contact with the insertion portion and the surface of the cover body is a dimension such that the insertion portion is pressed in, and the base end portion connected to the root portion faces the insertion portion with a gap. Here, "the dimension at which the insertion portion is pressed-in" in "...the distance between the contact surface and the surface of the cover body is the dimension at which the insertion portion is pressed-in" means that the distance between the contact surface and the surface of the cover body is formed smaller than the thickness of the insertion portion.

[0009] According to this aspect, the arm portion includes the base end portion connected to the root portion and the tip end portion connected to the base end portion. The contact surface of the tip end portion contacts the insertion portion in a press-fit state, but the base end portion faces the insertion portion with a gap therebetween and do not contact each other. If the base end is also in a pressed-in contact with the insertion portion, like the tip end, the stress due to the press-fitting would be concentrated at the connection portion between the base end and the root portion, making it more susceptible to damage. However, in the present embodiment, the base end is not in contact with the insertion portion, so the stress can be distributed and mitigated throughout the base end, reducing the risk of damage. In addition, the repulsive force from the arm portion due to the press-fit of the insertion portion is concentrated on the contact surface of the tip portion, which makes it even more difficult for the vibration of the motor to be transmitted separately to the inserted portion and the insertion portion, and makes them vibrate together, thereby further reducing the risk of abnormal noise.

[0010] Furthermore, in the motor of the present invention described above, the base end portion is formed in a stepped shape having two or more steps.

[0011] According to this aspect, the base end portion is formed in a stepped shape having two or more steps, so that the stress can be dispersed and alleviated more effectively than in a case of one step, and the risk of breakage can be further reduced.

[0012] The present invention is also characterized in that, in the motor of the above-mentioned aspect, the motor case is composed of a pair of a first case and a second case joined to the first case to be integrated, the insertion portion is composed of a first insertion portion provided in the first case and a second insertion portion provided in the second case, the terminal cover is a single body, the inserted portion is composed of a first inserted portion into which the first insertion portion is inserted and a second inserted portion into which the second insertion portion is inserted, and the motor case and the terminal cover are integrated by inserting the first insertion portion of the first case from a first direction into the first inserted portion of the single terminal cover and inserting the second insertion portion of the second case into the second inserted portion of the terminal cover from a second direction opposite to the first direction.

[0013] According to this aspect, the motor case and the terminal cover are integrated by inserting the first insertion portion of the first case from a first direction into the first insertion portion of the unitary terminal cover, and inserting the second insertion portion of the second case into the second insertion portion of the terminal cover from a second direction opposite to the first direction. This allows the first case and the second case to be easily attached to the unitary terminal cover. Furthermore, by subsequently fixing the first case and the second case together, the terminal cover can be held in the motor case with little risk of being displaced.

[0014] Furthermore, in the motor of the above aspect of the present invention, the length of the arm portion of the first inserted portion is different from the length of the arm portion of the second inserted portion.

[0015] According to this aspect, the arm portion of the first inserted portion and the arm portion of the second inserted portion have different lengths, which can further reduce the risk of abnormal noise due to vibration of the motor. Effect of the Invention

[0016] According to the present invention, in a motor having a structure in which a terminal cover is attached to a motor case, it is possible to reduce the risk of abnormal noise being generated due to vibrations when the motor is driven. [Brief description of the drawings]

[0017] [Figure 1] 1 is a perspective view of a main portion of a motor according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of a main part of the motor according to the first embodiment. [Diagram 3] FIG. 2 is a perspective view of a motor case according to the first embodiment. [Figure 4] FIG. 4 is a rear view of the terminal cover according to the first embodiment. [Diagram 5] FIG. 2 is an exploded perspective view of a motor case and a terminal cover according to the first embodiment. [Figure 6] 11 is an enlarged rear view of a main part in a state where the second insertion portion of the second case is inserted into the second inserted portion of the terminal cover in the first embodiment. FIG. [Figure 7] 4 is a perspective view of a state in which a first insertion portion of a first case is inserted into a first inserted portion of a terminal cover in accordance with the first embodiment. FIG. [Figure 8] 4 is a perspective view of a state in which a second insertion portion of a second case is inserted into a second inserted portion of a terminal cover in accordance with the first embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a motor according to the present invention will be described in detail with reference to FIGS. In the following description, the three mutually orthogonal axes are referred to as the X-axis, Y-axis, and Z-axis, as shown in each figure. The directions indicated by the arrows on the three axes (X, Y, Z) are the + directions of each direction, and the opposite directions are the - directions. The Z-axis direction corresponds to the vertical direction, i.e., the direction in which gravity acts, the +Z direction indicates a vertical upward direction, and the -Z direction indicates a vertical downward direction. The X-axis and Y-axis directions correspond to the horizontal direction. The +Y direction indicates the front direction of the motor, and the -Y direction indicates the rear direction of the motor. The +X direction indicates the right direction of the motor, and the -X direction indicates the left direction of the motor.

[0019] [Embodiment 1] The motor 1 of this embodiment is a stepping motor, and serves as a drive source for sliding a head-up display device (not shown) in the axial direction of a rotation shaft (to be described later). Of course, the motor 1 of the present invention is not limited to a motor used for sliding the head-up display device. As shown in FIG. 1, the motor 1 of this embodiment includes a cylindrical motor case 11 that houses a rotor 7 and a stator 9 therein, and a terminal cover 16 that is attached to the outer periphery 2 of the motor case 11. Fig. 2 is a perspective view showing a state in which the terminal cover 16 is attached to the motor case 11. Fig. 3 is a perspective view of the motor case 11, Fig. 4 is a rear view of the terminal cover 16, and Fig. 5 is an exploded perspective view of Fig. 3. In these figures, other motor components such as the rotor 7 and stator 9 are omitted from the drawings in order to make the drawings easier to understand. This also applies to the following figures.

[0020] As shown in Figures 3 and 5, motor case 11 is provided with an insertion portion 4. Furthermore, as shown in Figures 4 and 5, terminal cover 16 is provided with an inserted portion 5. Terminal cover 16 is attached to motor case 11 with insertion portion 4 of motor case 11 press-fitted into inserted portion 5. The structure in which insertion portion 4 is press-fitted into inserted portion 5 will be described later. As shown in Fig. 4, the inserted portions 5 of the terminal cover 16 are provided as a pair separated in the X-axis direction. The pair of inserted portions 5, 5 are arranged symmetrically with respect to the YZ plane. As shown in Fig. 3, the inserting portions 4 of the motor case 11 are also provided as a pair separated in the X-axis direction. The pair of inserting portions 4, 4 are arranged symmetrically with respect to the YZ plane. 1, the motor 1 includes a bearing 15 that supports one end (+Y side) of the rotating shaft 3, and a plate 17 that is fixed to the motor case 11 and holds the bearing 15. The motor 1 further includes a spring member 21. The spring member 21 is fixed to the plate 17 and applies an elastic force F to the bearing 15 that holds one end of the rotating shaft 3 in a direction toward the other end of the rotating shaft 3 (-Y direction).

[0021] In this embodiment, as shown in Figures 4 and 5, the inserted portion 5 has a root portion 10 protruding from the surface 8 of the cover body 6 of the terminal cover 16, and an arm portion 13 extending from a tip 12 of the root portion 10 along the surface 8 of the cover body 6 and at a distance S from the surface 8. The arm portion 13 has a tip portion 14 in a direction extending from the base portion 10, and a contact surface 18 that comes into contact with the insertion portion 4, and the distance between this contact surface 18 and the surface 8 of the cover body 6 is a dimension that allows the insertion portion to be pressed in. Here, the "extended direction" of the "tip portion 14 in a direction extending from the base portion 10" is, as can be seen from Fig. 4, a direction that intersects with the Y-axis direction and the Z-axis direction and is substantially along the X-axis. Specifically, since the motor case 11 is cylindrical, the "extended direction" is a direction that is along the outer periphery 2 of the cylindrical shape.

[0022] As shown in Fig. 8, the arm portion 13 is configured such that the base end portion 19 connected to the root portion 10 faces the insertion portion 4 with a gap g therebetween. That is, as shown in Fig. 4, the distance S1 between the base end portion 19 of the arm portion 13 and the surface 8 of the terminal cover 16 is greater than the distance S2 between the tip portion 14 and the surface 8. This creates the gap g (Fig. 6). 4, the distance S2 between the contact surface 18 of the arm portion 13 and the surface 8 of the cover body 6 is set to a dimension that allows the insertion portion 4 to be press-fitted. That is, the distance S2 is set to be smaller than the thickness t (FIG. 8) of the insertion portion 4. As shown in FIG. 8, when the insertion portion 4 is inserted into the inserted portion 5, the tip portion 14 is pushed open and becomes larger than the distance S2, and the distance in this state is the same as the thickness t of the insertion portion 4.

[0023] 4 and 6, in this embodiment, the base end 19 of the arm portion 13 is formed in a two-step shape. Therefore, the size of the gap g is not uniform over the entire length of the base end 19, but varies depending on the position. The size of the gap g is formed to be smaller near the tip end 14 than near the base portion 10. Although the base end portion 19 has a two-step staircase structure in this embodiment, it may have three or more steps.

[0024] In this embodiment, the motor case 11 is configured as a pair of a first case 111 and a second case 112 joined to the first case 11 to be integrated. The insertion portion 4 is configured as a first insertion portion 41 provided in the first case 111 and a second insertion portion 42 provided in the second case 112. The terminal cover 16 is a unitary piece. The inserted portion 5 is composed of a first inserted portion 51 into which the first insertion portion 41 is inserted, and a second inserted portion 52 into which the second insertion portion 42 is inserted.

[0025] 5, the first insertion portion 41 of the first case 111 is inserted from the first direction D1 into the first inserted portion 51 of the unitary terminal cover 16. This results in the state shown in FIG. Next, the second insertion portion 42 of the second case 112 is inserted into the second inserted portion 52 of the terminal cover 16 from the second direction D2 opposite to the first direction D1. This causes the motor case 11 and the terminal cover 16 to be integrated together, resulting in the state shown in FIG. 2. The first case 111 and the second case are integrated together by welding. Note that they may also be integrated together by fastening with screws or the like instead of welding. 8 shows a state in which the second insertion portion 42 of the second case 112 is first inserted from the second direction D2 into the second inserted portion 52 of the unitary terminal cover 16. In this case, the first insertion portion 41 of the first case 111 is then inserted into the first inserted portion 51 of the terminal cover 16 from the first direction D1.

[0026] As shown in FIG. 6, in this embodiment, the length L1 of the arm portion 13 of the first inserted portion 51 and the length L2 of the arm portion 13 of the second inserted portion 52 are configured to be different. Here, length L2 of arm portion 13 of second inserted portion 52 is formed longer than length L1 of arm portion 13 of first inserted portion 51. Specifically, there is a difference in length of tip end 14, and the length of base end 19 is the same. That is, the length of tip 14 of second inserted portion 52 is formed longer than the length of tip 14 of first inserted portion 51. As a result, contact surface 18 of tip 14 of second inserted portion 52 has a larger surface area than contact surface 18 of tip 14 of first inserted portion 51.

[0027] <Explanation of Effects of First Embodiment> (1) In this embodiment, the terminal cover 16 is attached to the motor case 11 with the insertion portion 4 of the motor case 11 pressed into the insertion portion 5. That is, since the insertion portion 4 is pressed into the insertion portion 5, the vibration of the motor 1 is not transmitted to the insertion portion 5 and the insertion portion 4 separately, but they vibrate together, thereby reducing the risk of abnormal noise. Also, since the insertion portion 4 is pressed into the insertion portion 5, the two portions come into firm contact with each other due to the repulsive force caused by the press-fitting. This allows the terminal cover 16 to be held in the motor case 11 with little risk of being displaced.

[0028] (2) In this embodiment, the arm portion 13 includes a base end 19 connected to the root portion 10, and a tip end 14 connected to the base end 19. The tip end 14 has a contact surface 18 that contacts the insertion portion 4 in a press-fit state, but the base end 19 faces the insertion portion 4 with a gap g therebetween, and the two do not contact each other. If the base end 19 is also in contact with the insertion section 4 in a press-fit state, as with the tip end 14, the stress due to the press-fitting will concentrate on the connection portion between the base end 19 and the root portion 10 and become prone to breakage, but in this embodiment, the base end 19 is not in contact with the insertion section 4, so the stress can be dispersed and mitigated throughout the base end 19. This can reduce the risk of breakage of the connection portion between the base end 19 and the root portion 10. In addition, the repulsive force from the arm portion 13 due to the press-fit of the insertion portion 4 is concentrated on the contact surface 18 of the tip portion 14. This makes it even more difficult for the vibration of the motor 1 to be transmitted separately to the inserted portion 5 and the insertion portion 4, and they vibrate more unitarily, thereby further reducing the risk of abnormal noise being generated.

[0029] (3) In this embodiment, the base end 19 is formed in a stepped shape with two or more steps, which can disperse and relieve the stress more than a single step, and can further reduce the risk of damage to the connection between the base end 19 and the root portion 10.

[0030] (4) In addition, in this embodiment, the first insertion portion 41 of the first case 111 is inserted into the first insertion portion 51 of the unitary terminal cover 16 from the first direction D1, and the second insertion portion 42 of the second case 112 is inserted into the second insertion portion 52 of the terminal cover 16 from the second direction D2 opposite to the first direction D1, thereby integrating the motor case 11 and the terminal cover 16. This allows the first case 111 and the second case 112 to be easily attached to the unitary terminal cover 16. Furthermore, by subsequently fixing the first case 111 and the second case 112 together, it is possible to hold the terminal cover 16 in the motor case 11 with little risk of it being displaced.

[0031] (5) In this embodiment, the length L1 of the arm portion 13 of the first inserted portion 51 is different from the length L2 of the arm portion 13 of the second inserted portion 52. This can further reduce the risk of abnormal noise due to vibration of the motor 1.

[0032] [Other embodiments] The motor 1 according to the present invention is based on the configuration described above, but it is of course possible to modify or omit some parts of the configuration without departing from the spirit of the present invention. [Explanation of symbols]

[0033] 1 ... motor, 2 ... outer periphery, 3 ... rotating shaft, 4 ... insertion part, 5 ... inserted part, 6: cover body, 7: rotor, 8: surface, 9: stator, 10: base portion, 11...motor case, 12...tip, 13...arm portion, 14...tip portion, 15...bearing, 16...terminal cover, 17...plate, 18...contact surface, 19: base end portion, 21: spring member, 41: first insertion portion, 42: second insertion portion, 51: first inserted portion; 52: second inserted portion; 111: first case; 112...second case, 1...first direction, D2...second direction, F...elastic force, g...gap, L1: length of the arm of the first inserted part, L2: length of the arm of the second inserted part, S...spacing, S1...spacing, S2...spacing, t...thickness

Claims

1. a cylindrical motor case that houses the rotor and the stator; a terminal cover attached to an outer periphery of the motor case; An insertion portion provided in the motor case; An insertion portion provided on the terminal cover, the terminal cover is attached to the motor case in a state in which the insertion portion of the motor case is press-fitted into the insertion portion, A motor characterized by:

2. 2. The motor according to claim 1, The inserted portion is a base portion protruding from a surface of the cover body of the terminal cover; an arm portion extending from a tip of the base portion along the surface of the cover body and spaced apart from the surface, The arm portion is a distance between a contact surface of the cover body and a surface of the cover body that is in contact with the insertion portion and is a dimension such that the insertion portion is press-fitted into the contact surface of the cover body, The base end portion connected to the base portion faces the insertion portion with a gap therebetween. A motor characterized by:

3. 3. The motor according to claim 2, The base end portion is formed in a step shape having two or more steps. A motor characterized by:

4. The motor according to any one of claims 1 to 3, The motor case includes: The housing is configured by a pair of a first case and a second case joined to the first case to be integrated with the first case, the insertion portion includes a first insertion portion provided in the first case and a second insertion portion provided in the second case, The terminal cover is a unitary body, the inserted portion includes a first inserted portion into which the first insertion portion is inserted and a second inserted portion into which the second insertion portion is inserted, The first insertion portion of the first case is inserted into the first insertion portion of the unitary terminal cover from a first direction, and the second insertion portion of the second case is inserted into the second insertion portion of the terminal cover from a second direction opposite to the first direction, thereby integrating the motor case and the terminal cover. A motor characterized by:

5. 5. The motor according to claim 4, The length of the arm portion of the first inserted portion is different from the length of the arm portion of the second inserted portion. A motor characterized by:

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