JP3906562B2 - Motor holding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor holding device that holds a motor mounted on a part with high vibration such as a vehicle.
[0002]
[Prior art]
For example, in a motor holding structure used as a drive source of a constant speed traveling device of a vehicle, as shown in FIG. 9, a mounting plate 3 is fixed to an end surface portion of the motor 1 on the protruding side of the rotary shaft 2 with a screw 4, The upper and lower ends of the mounting plate 3 are press-fitted into fitting grooves 7 and 8 provided in the resin housing 5 and the base 6, thereby fixing the rotating shaft 2 protruding side of the motor 1. On the other hand, the holding structure on the opposite side (bearing guide portion 9 side) of the rotating shaft 2 of the motor 1 is formed by the protrusions 10, 11 formed on the housing 5 and the base 6. The bearing guide part 9 side of the motor 1 is held by sandwiching the outer peripheral part up and down. Further, the motor terminal 12 is press-fitted into the connection groove 14 of the terminal 13 which is insert-molded in the base 6, so that the motor terminal 12 is electrically connected to the terminal 13.
[0003]
[Problems to be solved by the invention]
However, the above conventional holding structure is a structure in which the motor 1 is mainly held by the mounting plate 3 on the protruding side of the rotary shaft 2, and the bearing guide portion 9 side of the motor 1 moves in the vertical direction by the protruding portions 10 and 11. Therefore, the vibration load in the left-right direction on the bearing guide portion 9 side is applied to the connection groove 14 of the terminal 13 via the terminal 12 of the motor 1 as it is.
[0004]
In this holding structure, in a constant speed traveling device or the like mounted on a portion where vibration is not very strong (for example, vibration acceleration is 5G or less), there is not much problem with respect to left and right vibration loads. When used in a part with severe vibration conditions (for example, vibration acceleration of 10 to 40 G) such as an engine or a transfer like an actuator used in a -4WD switching device, the terminal 12 of the motor 1 to the terminal 13 The vibration load in the left-right direction applied to the connection groove 14 becomes too large, and the connection groove 14 is gradually expanded by the vibration load, and there is a possibility that a contact failure between the terminal 12 and the terminal 13 may occur. As a countermeasure, if the entire outer peripheral portion of the motor 1 on the bearing guide portion 9 side is fixed, the apparatus is increased in size and the number of assembling steps is increased, and the demand for downsizing and assembling improvement cannot be satisfied.
[0005]
The present invention has been made in consideration of such circumstances. Therefore, the object of the present invention is to stably hold the motor even when it is mounted in a place where the vibration conditions are severe. It is an object of the present invention to provide a motor holding device that can prevent poor contact with a terminal and satisfy the demands for miniaturization and cost reduction.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a motor holding device according to claim 1 of the present invention includes a holding plate and a terminal made of a metal plate in which a holding hole for holding a bearing support portion protruding toward one end of the motor is formed. Are integrated by resin insert molding to form a terminal assembly, and at the inner edge of the holding hole, a plurality of protrusions for supporting the outer periphery of the bearing support are formed, and the bearing support is While pressing into the holding hole of the holding plate and fixing the terminal assembly to the housing, the bearing support part side of the motor is fixed by the plurality of protrusions of the holding plate , and the bearing support part is By press-fitting into the holding hole of the holding plate, the terminal of the motor is press-fitted into the connection hole formed in the terminal so as to be integrally connected thereto. Than it is.
[0007]
In this way, the periphery of the bearing support portion of the motor can be held by the holding plate, so that the vibration load on the bearing support portion side of the motor can be reliably received by the holding plate, and the connection portion between the motor terminal and the terminal The vibration load applied to can be reduced. For this reason, even if it is mounted in a place where vibration conditions are severe, it is possible to prevent an excessive vibration load from being applied to the connection portion between the motor terminal and the terminal, and to prevent contact failure of the motor terminal over a long period of time. . In addition, since the bearing support portion having a smaller diameter than the outer periphery of the motor is held by the holding plate, the motor holding structure can be downsized as compared with the case where the outer periphery portion of the motor is held. Furthermore, since the holding plate is insert-molded in the terminal assembly, the holding plate can be fixed at the same time by attaching the terminal assembly to the housing, so that it is not necessary to fix the holding plate alone and the assembling property can be improved. . Also, by integrating the holding plate and the terminal with the terminal assembly, it is possible to prevent positional displacement between the holding plate and the terminal during assembly, and press-fitting the bearing support portion into the holding hole of the holding plate and the motor terminal to the terminal Can be reliably and easily connected.
[0008]
Moreover, the present invention is the inner edge portion of the holding hole of the hold plate, so to form a plurality of projections for supporting an outer peripheral portion of the bearing support portion, only a plurality of projections of the inner edge of the retaining hole bearing It is only necessary to contact or press contact with the outer periphery of the support part, and a gap can be provided between the inner edge of the holding hole and the outer periphery of the bearing support part, so that pressure input when press-fitting the bearing support part into the holding hole is possible. Can be reduced, and the press-fitting work of the bearing support portion can be easily performed. In addition, since the present invention is configured such that the press-fitting direction of the bearing support portion into the holding hole of the holding plate and the press-fitting direction of the motor terminal into the connection hole of the terminal are the same direction, the bearing support portion is held. At the same time as press-fitting into the hole, the motor terminal can also be press-fitted into the connection hole, and the assembly of the motor can be further improved.
[0009]
According to a second aspect of the present invention, the holding plate and the terminal are insert-molded into the terminal assembly in a state where the holding plate and the terminal are joined by the connecting portion, and the connecting plate is cut off after the insert molding so that the holding plate and the terminal are separated. Anyway. In this way, it is not necessary to position the holding plate and the terminal separately at the time of insert molding, the positioning structure of the mold can be simplified, and the parts can be efficiently set in the mold. In addition to reducing the molding cost, it is easy to manage parts before molding.
[0010]
According to a third aspect of the present invention, the motor terminals are arranged on both sides of the bearing support portion, and connection holes are formed in portions of the terminals extending on both sides of the holding holes, and the motor terminals are press-fitted into the connection holes. You may make it connect electrically. In this way, the press-fitting direction of the bearing support part into the holding hole of the holding plate and the press-fitting direction of the motor terminal into the connection hole of the terminal are the same direction, so the bearing support part is press-fitted into the holding hole. At the same time, the motor terminal can be press-fitted into the connection hole, and the assembly of the motor can be further improved.
[0011]
In this case, as in claim 4, the portion of the terminal in which the connection hole is formed is bent into a U shape or a V shape so that the center portion of the connection hole is lowered when viewed from the motor side. The connecting hole may be formed so that the gap becomes narrower from both ends toward the center. In this way, since the connection hole can be tapered, the motor terminal can be easily press-fitted into the connection hole, and the pressure contact force of the motor terminal can be sufficiently secured in the portion where the gap of the connection hole becomes narrow. Therefore, both press-fit workability and electrical connection reliability can be achieved.
[0012]
According to a fifth aspect of the present invention, a guide wall that is in contact with or close to the outer peripheral surface of the motor may be integrally formed in the terminal assembly. In this way, when the bearing support portion is press-fitted into the holding hole of the holding plate, the bearing support portion can be guided toward the holding hole by the guide wall integrally formed with the terminal assembly. The press-fitting can be easily performed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment in which the present invention is applied to an actuator of a 2WD-4WD switching device for a vehicle will be described with reference to FIGS. As shown in FIG. 8, the motor 22 for driving the actuator 21 is housed in a container-like housing 23, and the rotation of the motor 22 is decelerated by a reduction mechanism composed of a plurality of gears 52 to 55. It is converted into a linear slide motion of the rack 56. When the actuator rod 25 slides integrally with the rack 56, the 2WD-4WD switching device is switched. As shown in FIG. 1, the motor 22 has a rotating shaft 24 protruding at the upper end side and a bearing support portion 32 protruding at the lower end side, and two motor terminals 36 are provided downward at positions on both sides of the bearing support portion 32. ing.
[0014]
Next, the holding structure of the motor 22 will be described with reference to FIGS. As shown in FIG. 5, the terminal assembly 26 that holds the lower end side of the motor 22 is formed by insert-molding a holding plate 27 and a terminal 28 with an insulating resin. The holding plate 27 and the terminal 28 are formed by punching one metal plate, for example, and the one holding plate 27 and the two terminals 28 are connected to a plurality of connecting portions 29 (until the insert molding is completed. 5 and FIG. 6 are connected by hatching). And after insert molding, by cutting off each connection part 29, it is cut into the holding plate 27 and each terminal 28, and is electrically insulated. Each connecting portion 29 is formed so as to be exposed from the resin together with a holding hole 33, a connecting hole 37, a fixing portion 35, and a tip portion 47 of the terminal 28, which will be described later. The terminal assembly 26 is integrally formed with a guide wall 31 that guides the outer periphery of the motor 22 during assembly.
[0015]
As shown in FIG. 4, a circular holding hole 33 is formed in the holding plate 27 at a position corresponding to the bearing support portion 32 of the motor 22, and a plurality of protrusions 34 are formed at the inner edge of the holding hole 33. It is formed so as to support the outer peripheral portion of the bearing support portion 32 at equal intervals (the number and shape of the protrusions 34 may be changed as appropriate). The bearing support portion 32 is press-fitted into the holding hole 33 so that the lower end side of the motor 22 is held by the holding plate 27. As shown in FIGS. 5 and 6, a fixing portion 35 for fixing to the housing 23 is integrally formed at the right end portion of the holding plate 27.
[0016]
The left end portion of each terminal 28 is formed so as to extend on both sides of the holding hole 33, and the connection hole 37 of the motor terminal 36 is formed in the left end portion of each terminal 28. Thereby, the press-fitting direction of the motor terminal 36 is the same direction as the press-fitting direction of the bearing support portion 32. The motor terminal 36 is press-fitted into each connection hole 37 so that the motor terminal 36 and the terminal 28 are electrically connected. A portion of the terminal 28 where the connection hole 37 is formed is bent in a U shape or a V shape so that the center portion of the connection hole 37 is lowered when viewed from the motor 22 side [FIG. The connection hole 37 is formed so that the gap becomes narrower from both ends toward the center, thereby forming the connection hole 37 in a tapered hole shape.
[0017]
The terminal assembly 26 is fixed to the housing 23 by inserting and tightening a screw 40 (see FIG. 2) into a screw hole 35a formed in the fixing portion 35. In this fixed state, as shown in FIG. 1, the guide wall 31 of the terminal assembly 26 is accommodated in the space between the side wall portions 38 and 39 integrally formed in the housing 23.
[0018]
As shown in FIG. 1, a mounting plate 41 is fixed to the upper end side of the motor 22 (the projecting side of the rotary shaft 24) with screws 42, and through holes 43 formed on both side portions of the mounting plate 41 have side wall portions. Both side portions of the mounting plate 41 are fixed to the housing 23 by screws 46 in a state where they are fitted to the positioning convex portions 44 on the upper end surfaces of 38 and 39.
[0019]
Next, the assembly procedure of the motor 22 will be described. The bearing support portion 32 of the motor 22 is press-fitted into the holding hole 33 of the holding plate 27, and at the same time, the motor terminal 36 is press-fitted into the connection hole 37 of the terminal 28. Thereby, the bearing support portion 32 side of the motor 22 is held by the holding plate 27 of the terminal assembly 26, and the motor terminal 36 is electrically connected to the terminal 28. When the bearing support portion 32 is press-fitted into the holding hole 33, the bearing support portion 32 can be guided toward the holding hole 33 by the guide wall 31 formed integrally with the terminal assembly 26. It can be done easily.
[0020]
Thereafter, as shown in FIG. 7, the tip portion 47 of the terminal 28 is inserted into a connector 48 formed in the housing 23. In this case, as shown in FIG. 3 (b), since the tip portion 47 of the terminal 28 is bent upward at a right angle in advance, when the tip portion 47 of the terminal 28 is inserted into the connector 48, the terminal With the left side (motor 22 side) of the assembly 26 facing upward, the tip portion 47 of the terminal 28 is inserted into the connector 48. Thereafter, the terminal 28 is provided in the housing 23 while the terminal assembly 26 is tilted downward. The terminal assembly 26 is bent along the convex portion 49 so as to be along the bottom surface of the housing 23.
[0021]
At this time, as shown in FIG. 2, the terminal assembly 26 is positioned with respect to the housing 23 by fitting the positioning hole 50 of the terminal assembly 26 to the positioning pin 51 on the bottom surface of the housing 23. Further, the through-hole 43 of the mounting plate 41 previously attached to the upper end side of the motor 22 is fitted into the positioning convex portion 44 of the housing 23, and the mounting plate 41 is fixed to the side wall portions 38 and 39 of the housing 23 with screws 46. At the same time, the fixing portion 35 of the terminal assembly 26 is fixed to the bottom wall of the housing 23 with the screw 40. Thereby, the assembly of the motor 22 is completed.
[0022]
By the way, in the conventional motor holding structure shown in FIG. 9, the movement of the motor 1 on the bearing guide portion 9 side is restricted by the protrusions 10 and 11 in the vertical direction. The vibration load in the direction is applied to the connection groove 14 of the terminal 13 through the terminal 12 of the motor 1 as it is. For this reason, when the vibration conditions are severe, the connection groove 14 is gradually expanded by the vibration load, and there is a possibility that a contact failure between the terminal 12 and the terminal 13 may occur.
[0023]
On the other hand, in the motor holding structure of the present embodiment, since the periphery of the bearing support portion 32 of the motor 22 can be held by the holding plate 27, the vibration load on the bearing support portion 32 side of the motor 22 is surely secured by the holding plate 27. The vibration load applied from the motor terminal 36 to the connection hole 37 of the terminal 28 can be reduced. For this reason, it is possible to prevent the connection hole 37 of the terminal 28 from being deformed by a vibration load from the motor terminal 36 even in a place where the vibration conditions are severe, and to prevent contact failure between the motor terminal 36 and the terminal 28 for a long period of time. And the reliability of the electrical connection can be improved.
[0024]
Further, since the holding plate 27 is insert-molded into the terminal assembly 26, the holding plate 27 can be fixed at the same time by attaching the terminal assembly 26 to the housing 23, and it is not necessary to fix the holding plate 27 alone. . In addition, since the press-fitting direction of the bearing support portion 32 to the holding hole 33 of the holding plate 27 and the press-fitting direction of the motor terminal 36 to the connection hole 37 of the terminal 28 are the same direction, the bearing support portion 32 becomes the holding hole 33. At the same time as the press fitting, the motor terminal 36 can also be press fitted into the connection hole 37. Further, by integrating the holding plate 27 and the terminal 28 by the terminal assembly 26, it is possible to prevent the positional deviation between the holding hole 33 of the holding plate 27 and the connection hole 37 of the terminal 28 during assembly, and the bearing to the holding hole 33. The press-fitting of the support portion 32 and the press-fitting of the motor terminal 36 into the connection hole 37 can be reliably and easily performed, and the assembling property of the motor 22 can be improved in combination with the circumstances described above.
[0025]
Further, since the bearing support portion 32 having a smaller diameter than the outer periphery of the motor 22 is held by the holding plate 27, the motor holding structure can be reduced in size as compared with the case where the outer peripheral portion of the motor 22 is held. It can meet the demand for space saving.
[0026]
In addition, the holding plate 27 and the terminal 28 are insert-molded into the terminal assembly 26 in a state where the holding plate 27 and the terminal 28 are coupled to each other. After the insert molding, the connecting portion 29 is cut off to separate the holding plate 27 and the terminal 28. In insert molding, it is not necessary to position the holding plate 27 and the terminal 28 separately, the positioning structure of the molding die can be simplified, and the parts can be efficiently set in the molding die. Can be reduced. In addition, since it is not necessary to separately manage the holding plate 27 and the terminal 28 before molding, it is easy to manage the parts before molding. However, in the present invention, the holding plate and the terminal may be separately formed and insert-molded, and even in this case, the intended object of the present invention can be sufficiently achieved.
[0027]
Further, in the present embodiment, the connection hole 37 forming portion of the terminal 28 is bent in a U shape or a V shape so that the central portion of the connection hole 37 is lowered when viewed from the motor 22 side, and Since the connection hole 37 is formed so that the gap becomes narrower from the both ends toward the center, the connection hole 37 can be tapered, and the motor terminal 36 can be easily press-fitted into the connection hole 37. The contact force of the motor terminal 36 can be sufficiently secured at the portion where the gap of the connection hole 37 becomes narrow, and both press-fit workability and electrical connection reliability can be achieved.
[0028]
Incidentally, the holding hole of the hold plate formed on the non-circular shape such as a polygon with a plurality of projections of the inner peripheral edge, a plurality of portions of the inner edge of the retaining hole (portion corresponding to the plurality of protrusions) bearing It is good also as a structure contact | abutted or press-contacted to the outer periphery of the support part 32. FIG.
[0029]
In the above embodiment, the present invention is applied to the actuator of the 2WD-4WD switching device. However, the present invention may be applied to an actuator mounted in a place where vibration conditions are severe such as an engine or a transfer. Of course, the present invention may be applied to an actuator mounted in a place where vibration is not so strong, or may be applied to an actuator mounted in a device other than a vehicle.
[0030]
In addition, in the present invention, the shapes of the terminal assembly 26, the holding plate 27, and the terminal 28 are changed as appropriate, the position of the connection hole 37 of the terminal 28 (position of the motor terminal 36) is changed as appropriate, or the upper end side of the motor 22 is changed. Needless to say, various modifications can be made without departing from the scope of the invention, for example, the fixing structure of the rotating shaft 24 projecting side may be appropriately changed.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing a motor assembled state to a housing in an embodiment of the present invention. FIG. 2 is a plan view showing a motor assembled state to the housing. Is a plan view showing a state where a motor is attached to a terminal assembly, (b) is a side view thereof. [FIG. 4] A partially enlarged bottom view showing a state where a motor is attached to a terminal assembly [FIG. 5] A plan view of the terminal assembly [FIG. 6] Plan view showing the connection state of the holding plate and the terminal before insert molding [FIG. 7] A longitudinal sectional view of the main part for explaining the method of assembling the terminal assembly [FIG. 8] A plan view of the actuator [FIG. This shows the state of assembly of the motor to the conventional housing, (a) is a longitudinal side view of the main part, (b) is an overall vertical front view.
DESCRIPTION OF SYMBOLS 21 ... Actuator, 22 ... Motor, 23 ... Housing, 24 ... Rotating shaft, 26 ... Terminal assembly, 27 ... Holding plate, 28 ... Terminal, 29 ... Connection part, 31 ... Guide wall, 32 ... Bearing support part, 33 ... Holding Holes 34... Projections 35. Fixing parts 36. Motor terminals 37. Connection holes 41. Mounting plates 48. Connectors 50.

Claims (5)

A motor holding device that holds the bearing support portion side of the motor in the housing in a state where the terminal of the motor from which the bearing support portion protrudes on one end side is electrically connected to the terminal,
A metal plate holding plate in which a holding hole for holding the bearing support portion is formed and the terminal are integrated by resin insert molding to form a terminal assembly, and the inner edge of the holding hole has the Forming a plurality of protrusions that press fit and support the outer periphery of the bearing support,
The bearing support portion is press-fitted into the holding hole of the holding plate, and the terminal assembly is fixed to the housing, thereby fixing the bearing support portion side of the motor with the plurality of protrusions of the holding plate , and The bearing support portion is press-fitted into the holding hole of the holding plate, so that the motor terminal is press-fitted into the connection hole formed in the terminal and electrically connected to the holding hole. A motor holding device. The holding plate and the terminal are insert-molded into the terminal assembly in a state where they are connected by a connecting portion, and after the insert molding, the connecting portion is cut off so that the holding plate and the terminal are separated. The motor holding device according to claim 1 . Terminals of the motor are arranged on both sides of the bearing support part,
3. The motor holding device according to claim 1, wherein a connection hole for electrically connecting the terminal by press-fitting is formed in a portion of the terminal extending on both sides of the holding hole. The portion of the terminal where the connection hole is formed is bent in a U shape or a V shape so that the center portion of the connection hole is lower when viewed from the motor side, and the connection hole is The motor holding device according to claim 3 , wherein the gap is narrowed from both ends toward the center. Wherein the terminal assembly, the motor holding apparatus according to any one of claims 1 to 4 in contact with or close to the guide wall to the outer circumferential surface of the motor is characterized in that it is integrally molded.

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