JP3729370B2 - Small motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small motor used to drive a fluid pump.
[0002]
[Prior art]
As a small motor for driving a fluid pump, an armature core and a commutator are fixed on a single-axis armature shaft provided in an armature, and an armature coil is wound around the armature core and electrically connected to the commutator, It is known that an eccentric cam provided in a pump is coupled to an end of an armature shaft. When the armature rotates by energizing the commutator, the eccentric cam rotates together with the armature shaft, the piston that contacts the eccentric cam reciprocates, and the piston reciprocates, so that one of the valves coupled to the piston The fluid was sucked in and the fluid was discharged on the other side of the valve.
[0003]
[Problems to be solved by the invention]
However, in the above small motor, the vibration of the pump piston motion is transmitted to the end of the armature shaft through the eccentric cam, so that a large impact force is applied to the armature core, commutator, and armature coil through the armature shaft. As a result, there is a problem that the armature coil is cut between the armature core and the commutator. Further, in the above small motor, since the rotational force for moving the eccentric cam of the pump is the same as the rotational force generated by the armature core, there is a problem that the starting torque of the armature must be increased. The problem was to solve the problem.
[0004]
OBJECT OF THE INVENTION
The small motor according to the present invention provides a small motor that can be started with a small starting torque while preventing the armature coil from being disconnected by reducing the vibration transmitted from the pump to the armature core and the commutator. The purpose is that.
[0005]
[Structure of the invention]
[0006]
[Means for Solving the Problems]
In the small motor according to the first aspect of the present invention, the first shaft coupled to the eccentric cam provided in the pump, the one end portion coupled to the first shaft and the other end portion of the shaft of the first shaft. A second shaft extending in a direction and elastically deformable by twisting between one end and the other end, and a pipe disposed outside the second shaft and coupled to the other end of the second shaft ElementConsisting ofAn armature shaft, an armature core fixed to a pipe member of the armature shaft, a commutator fixed to a pipe member in the vicinity of the armature core, and an armature wound around the armature core and electrically connected to the commutator A coil, a bearing that rotatably supports the armature shaft, a brush that can be electrically connected to the commutator and disposed outside the commutator, and a magnet disposed outside the armature coreThe bearing includes a first end bearing that rotatably supports one end portion of the first shaft, a second end bearing that rotatably supports the other end portion of the pipe member, and the first end bearing and the other end. An intermediate bearing disposed between the side bearing and rotatably supporting the other end of the first shaft and one end of the pipe member.It is characterized by having a configuration.
[0007]
Claims of the invention2In the small motor according to the present invention, the second shaft is provided with a second shaft main body having an outer diameter smaller than the inner diameter of the pipe member, and at one end of the second shaft main body, The first shaft side fixing portion to be fitted and fixed is formed, and the pipe member side fixing portion to be fixed to the pipe member is formed at the other end portion of the second shaft main body. It is a feature.
[0008]
Claims of the invention3In the small motor according to the above, the pipe member is provided with a pipe member main body that is disposed outside the second shaft in a non-contact manner with the second shaft, and at one end of the pipe member main body, the second shaft and A non-contact portion arranged in a non-contact manner on the first shaft is formed, and a coupling portion to be coupled to the pipe member side fixing portion of the second shaft is formed at the other end portion of the pipe member main body. It is characterized by having a configuration.
[0009]
Claims of the invention4In the small motor according to the first aspect, the intermediate bearing is disposed outside the other end portion of the first shaft and rotatably supports the other end portion of the first shaft.Between the first shaft receiving portion, the pipe member receiving portion that is disposed outside the one end portion of the pipe member and rotatably supports the one end portion of the pipe member, and between the first shaft receiving portion and the pipe member receiving portion. The other end portion of the first shaft and the one end portion of the pipe member are integrally formed with a non-contact intermediate escape portion.It is characterized by having a configuration.
[0010]
Claims of the invention5In the small motor according to the first aspect, the intermediate bearing is disposed outside the other end portion of the first shaft and rotatably supports the other end portion of the first shaft.A first intermediate bearing and a second intermediate bearing that are formed independently of the first intermediate bearing and are disposed outside the one end portion of the pipe member and rotatably support the one end portion of the pipe member are provided.It is characterized by having a configuration.
[0011]
[Effects of the Invention]
In the small motor according to the first aspect of the present invention, when a rotational force is applied to the pipe member from the armature core, the second shaft accumulates the rotational energy and then transmits the rotational energy to the first shaft. Therefore, the starting torque required when the armature starts rotating is reduced. Further, when the energization to the commutator is cut during the rotation of the armature, the kinetic energy of the pump piston is applied as an impact force to the first shaft through the eccentric cam, and the impact applied to the first shaft. A force is applied to one end of the second shaft. At this time, the other end of the second shaft is separated in the axial direction of the first shaft, and the other end of the pipe member is coupled to the other end of the second shaft. The impact force applied to one end of the first shaft is attenuated while it is transmitted from the other end of the first shaft to the other end of the second shaft. Therefore, the impact force applied to the first shaft is reduced and transmitted to the pipe member to which the armature core and the commutator are fixed.Further, the armature shaft is configured such that the first shaft is rotatably supported by the one end side bearing and the intermediate bearing, and the pipe member is rotatably supported by the other end side bearing and the intermediate bearing. When a rotational force is applied from the core, the pipe member can transmit the rotational force from the armature core to the second shaft without swinging because the other end of the pipe member is rotatably supported by the other end bearing. Further, this rotational force is smoothly transmitted to the first shaft that is rotatably supported by the intermediate bearing.
[0012]
Claims of the invention2In the small motor according to the second shaft disposed inside the pipe member, the first shaft-side fixing portion at one end of the second shaft body is coupled to the first shaft, while the second shaft Since the pipe member side fixing portion at the other end of the shaft body is fixed to the pipe member, the pipe member to which the armature core and the commutator are fixed is not directly coupled to the first shaft. Therefore,In the operation of claim 1In addition, the impact force applied to the first shaft is alleviated during the period from the second shaft main body of the second shaft to the pipe member fixing portion, and is hardly transmitted to the pipe member.
[0013]
Claims of the invention3In the small motor according to the first aspect, the pipe member whose coupling portion is coupled to the pipe member side fixing portion of the second shaft is disposed in a non-contact manner outside the second shaft, and the non-contact portion is the first non-contact portion. It is arranged away from the shaft. Therefore, the claim2In addition to the above action, the impact force applied to the first shaft is not directly transmitted to the non-contact portion of the pipe member or the pipe member body of the pipe member.
[0014]
Claims of the invention4In the small motor related to the armature shaft, the pipe member isPipe member receiving portion and other end side bearing provided in the intermediate bearingWhile being rotatably supported byThe first shaft is rotatably supported by a first shaft receiving portion integrally formed with the pipe member receiving portion and the one end side bearing through an intermediate relief portion on the intermediate bearing. Therefore, in addition to the operation of the first, second, or third aspect, the bearing for supporting the other end portion of the first shaft and the bearing for supporting the one end portion of the pipe member are separately provided. The number of man-hours required for creation is greatly reduced.
[0015]
Claims of the invention5In the small motor related to the armature shaft, the pipe member isSecond intermediate bearing and other end bearingWhile being rotatably supported byThe first shaft is rotatably supported by the one end side bearing and the first intermediate bearing. Therefore, in addition to the operation of the first, second or third aspect, the pipe member transmits the rotational force applied from the armature core to the second shaft without shaking at both ends. The first shaft transmits the rotational force applied from the second shaft to the pump side without shaking at both ends.
[0016]
【Example】
1 to 3 show a first embodiment of a small motor according to the present invention.
[0017]
The illustrated small motor 1 mainly includes a motor case 2, a first magnet 3, a second magnet 4, an armature 5, a first bearing 6, a second bearing 7, an intermediate bearing 8, and a first brush 9. The armature 5 includes the first shaft 11, the second shaft 12, and the pipe member 13, the armature core 15, the commutator 16, and the armature coil 17. And are provided. The motor case 2 is coupled to a pump case 19 containing a pump 18.
[0018]
The motor case 2 is open at one end and closed at the other end, and has a first magnet 3 and a second magnet 4 attached to the inside thereof. The first and second magnets 3 and 4 are magnetized with N and S poles at opposite positions, respectively, and an armature 5 is disposed inside the first and second magnets 3 and 4.
[0019]
A second bearing 7 for rotatably supporting the other end portion of the armature shaft 14 provided in the armature 5 is fixed inside the closed end portion of the motor case 2. The end of the motor case 2 is screwed to the pump case 19.
[0020]
The pump case 19 is disposed on the protruding side of the armature shaft 14 disposed in the motor case 2. A round hole shaft hole 19 a into which the armature shaft 14 is inserted is formed at the center of the pump case 19.
[0021]
A first bearing 6 is fixed in the shaft hole 19a near one end on the opposite side to the motor case 2. The intermediate bearing 8 is fixed to the other end of the shaft hole 19a on the motor case 2 side.
[0022]
The first bearing 6 is a slide bearing, and one end portion of the first shaft 11 provided in the armature shaft 14 is inserted into the first bearing 6.
[0023]
The second bearing 7 is a sliding bearing, and the other end portion of the pipe member 13 is inserted into the second bearing 7.
[0024]
The intermediate bearing 8 is a slide bearing. The intermediate bearing 8 includes a first shaft receiving portion on the inner peripheral portion of a cylindrical bearing body 8a and a first shaft 11 provided on the armature shaft 14. 8b is formed. A pipe member receiving portion 8c is formed on the inner peripheral portion of the bearing body 8a on the pipe member 13 side. Between the first shaft receiving portion 8b and the pipe member receiving portion 8c, a middle escape portion 8d having a larger inner diameter than the first shaft receiving portion 8b and the pipe member receiving portion 8c is formed. . In the intermediate bearing 8, since the first shaft receiving portion 8b, the pipe member receiving portion 8c, and the middle escape portion 8d are integrally formed with the bearing body 8a, the intermediate bearing 8 is easily formed as a single structure.
[0025]
The armature 5 disposed inside the first and second magnets 3 and 4 includes an armature shaft 14, an armature core 15, a commutator 16, and an armature coil 17.
[0026]
As described above, the armature shaft 14 includes the first shaft 11, the second shaft 12, and the pipe member 13.
[0027]
The first shaft 11 is provided with a first shaft main body 11 a having a round bar shape having a length approximately equal to a shaft hole 19 a formed in the pump case 19. The center of the first shaft body 11a is a cam fixing portion 11b. An eccentric cam 20 provided in the pump 18 is fixed to the cam fixing portion 11b.
[0028]
A second shaft insertion hole 11c having a round hole shape is formed at the other end portion of the first shaft body 11a. A first shaft side fixing portion 12b provided on the second shaft 12 is coupled to the second insertion hole 11c. At this time, the second shaft insertion hole 11d is formed in a penetrating shape in the axial direction of the first shaft body 11a, and the first shaft side fixing portion 12b provided on the second shaft 12 is further extended. The first shaft 12 may be rotatably supported by the first bearing 6 by coupling the second shaft 12 through the second shaft insertion hole 11c formed and penetrating through the second shaft 12. .
[0029]
Since the first shaft 11 has one end inserted into the first bearing 6 and the other end inserted into the first shaft receiving portion 8b provided in the intermediate bearing 8, the first shaft 11 The bearing 7 and the intermediate bearing 8 are rotatably supported at two points.
[0030]
The second shaft 12 has a length dimension larger than that of the first shaft in the same direction as the axial direction of the first shaft 11, and the second shaft 12 includes the motor case 2. A second shaft body 12a having a round bar shape having an outer diameter smaller than the outer diameter of the first shaft 11 is provided as having a length slightly larger than the length. The second shaft main body 12a has a smaller outer diameter than the first shaft 11 and the pipe member 13, and the distance from one end to the other end is large.
[0031]
The first shaft 11 is fixed to one end of the second shaft main body 12a on the first shaft 11 side with an outer diameter smaller than the outer diameter of the first shaft main body 11a of the first shaft 11. A portion 12b is formed. The second shaft 12 is integrally coupled to the first shaft 11 by fitting the first shaft-side fixing portion 12 b into the second shaft insertion hole 11 c of the first shaft 11. At this time, the second shaft 12 may be integrally formed with the first shaft 11 assuming that one end of the second shaft body 12a is continuous with the other end of the first shaft 11, in which case Since the second shaft 12 is not formed independently of the first shaft 11, the man-hours can be reduced.
[0032]
At the other end of the second shaft main body 12a, a pipe member having an outer diameter dimension larger than the outer diameter dimension of the second shaft main body 12a and slightly smaller than the inner diameter dimension of the pipe member 13 and having an axial shape. A side fixing portion 12c is formed. The pipe member side fixing portion 12 c is fixed to the other end portion of the pipe member 13 at a coupling portion 13 b provided in the pipe member 13.
[0033]
The second shaft 12 rotates together with the pipe member 13 and is given to the pipe member side fixing portion 12c when a rotational force is applied to the pipe member side fixing portion 12c from the armature core 15 fixed to the pipe member 13. The transmitted rotational force is transmitted to the first shaft 11. At this time, the second shaft 12 receives a rotational force from the pipe member 13, and the pipe member side fixing portion 12 c is twisted with respect to the first shaft side fixing portion 12 b at one end, thereby causing the second shaft 12. Since the shaft 12 accumulates rotational energy and then transmits the rotational force to the first shaft 11, the armature 5 can be started to rotate even with a small starting torque.
[0034]
The second shaft 12 has a smaller outer diameter than the first shaft 11 and the pipe member 13, and the distance from one end to the other end is large. When impact energy is applied to one end portion of the first shaft 11, the impact energy is elastically absorbed and attenuated to the other end portion.
[0035]
A pipe member 13 is disposed outside the second shaft 12. As shown in FIG. 2, the pipe member 13 has an inner diameter that is larger than the outer diameter of the second shaft body 12 a of the second shaft 12, and is a portion protruding from the first shaft 11. A pipe member main body 13 a having a length dimension slightly smaller than the entire length of the second shaft 12 and having a cylindrical shape that covers substantially the entire second shaft 12 is provided.
[0036]
In the pipe member main body 13a, a coupling portion 13b is formed on the inner peripheral portion of the other end portion. Since this coupling portion 13b has an inner diameter dimension slightly larger than the outer diameter dimension of the pipe member side fixing portion 12c of the second shaft 12, it is coupled to the pipe member side fixing portion 12c of the second shaft 12. Yes. For the connection at that time, laser welding, shrink fitting, serration, rolling, or the like is used, but laser welding is preferably used.
[0037]
As shown in FIG. 3, the pipe member main body 13a is formed with a non-contact portion 13c at one end. The non-contact portion 13c has a length that is slightly smaller than the entire length of the second shaft 12 at the portion where the pipe member main body 13a protrudes from the first shaft 11, and thus the first shaft 11 The first shaft 11 is not in contact with the other end of the first shaft 11. Further, since the pipe member main body 13a has an inner diameter dimension larger than the outer diameter dimension of the second shaft main body 12a of the second shaft 12, the non-contact portion 13c has a second shaft main body 12a of the second shaft 12. There is no contact.
[0038]
In the pipe member 13, the coupling portion 13 b at the other end is coupled to the pipe member side fixing portion 12 c at the other end of the second shaft 12, and the non-contact portion 13 c at one end is the other end of the first shaft 11. Since the second shaft 12 is also arranged away from the second shaft body 12a, when the rotational force from the armature core 18 is applied, the rotational force is applied to the second shaft 12 through the coupling portion 13b. Tell. At that time, the pipe member main body 13a and the non-contact portion 13c do not contact the second shaft main body 12a at all.
[0039]
One end of the pipe member 13 is inserted into the pipe member receiving portion 8c of the intermediate bearing 8 described above, while the other end is inserted into the second bearing 7 described above. The two bearings 7 are rotatably supported at two points.
[0040]
In the armature shaft 14, the first shaft 11 is supported by the first bearing 6 and the first shaft receiving portion 8 b of the intermediate bearing 8, and the pipe member 13 is the pipe member receiving portion 8 c of the intermediate bearing 8 and the second bearing. 7 is supported by 4 points as a whole.
[0041]
In the armature shaft 14, one end of the pipe member 13 is supported by the pipe member receiving portion 8 c of the intermediate bearing 8, while the other end of the pipe member 13 is supported by the second bearing 7. There is no vibration at both ends.
[0042]
In the armature shaft 14, one end of the first shaft 11 is supported by the first bearing 6, while the other end of the first shaft 11 is supported by the first shaft receiving portion 8 b provided in the intermediate bearing 8. Since the shaft 18 is supported, the eccentric cam 20 provided in the pump 18 is provided with the rotational force applied from the second shaft 12 by the support of the first shaft receiving portion 8b of the first bearing 6 and the intermediate bearing 8 which are close to each other. It is converted without loss to the rotational force for rotating.
[0043]
In the armature shaft 14, an eccentric cam 20 provided in the pump 18 is fixed to the cam fixing portion 11 b of the first shaft 11. In the pump 18, the first and second pistons 23 and 24 biased by the first and second return springs 21 and 22 are pressed against the eccentric cam 20, and the first and second pistons are pressed. 23 and 24 are connected to the first and second valves 25 and 26, respectively. In the pump 18, the first and second pistons 23 and 24 reciprocate against the first and second return springs 21 and 22 by the rotation of the eccentric cam 20, and the first and second pistons 23. , 24 reciprocally move, the first and second valves 25, 26 open and close the fluid flow path, and suck and discharge the fluid.
[0044]
An armature core 15 is fixed to the outer side of the center of the pipe member 13 of the armature shaft 14. As shown in FIG. 2, the armature core 15 is formed with a winding portion 15 a having a predetermined number of slots (12 slots). A commutator 16 is fixed on the pipe member 13 in the vicinity of the armature core 15. The commutator 16 is provided with the same number of commutator pieces 16 a as the winding portions 15 a of the armature core 15. In the armature core 16, the armature coil 17 that is electrically connected to the commutator piece 16a is wound around the winding portion 15a. The armature core 16 is disposed in a non-contact manner on the inner peripheral portions of the first and second magnets 3 and 4 described above.
[0045]
On the outside of the commutator 16 of the armature 5, first and second brushes 9 and 10 are arranged to face each other so as to be electrically connectable to the commutator piece 16 a. The first and second brushes 9 and 10 are held in a state of being pressed toward the commutator pieces 16a and 16a arranged to face each other by a brush spring (not shown) attached to the closing side of the motor case 2. It is electrically connected to an external control circuit (not shown) by an external connection wiring (not shown).
[0046]
The armature 5 is electrically connected to the first brush 9 and the first brush 9 when the power supply potential is applied to the first brush 9 from the control circuit through the external connection wiring and the second brush 10 is grounded. One of the commutator pieces 16a connected, the armature coil 17 in the winding portion 15a electrically connected to the commutator piece 16a, and another commutator piece 16a electrically connected to the armature coil 17 A current of a power source flows through the second brush 10 electrically connected to the commutator piece 16a, and a magnetic force is generated in the winding portion 15a of the armature core 15. The magnetic force generated from the armature core 15 is , Armature shaft by electromagnetic induction by the magnetic force generated by the second magnets 3 and 4 The rotational force in the forward direction is applied to the 4 of the pipe member 13.
[0047]
The armature 5 is applied to the pipe member side fixing portion 12c because the pipe member 13 to which the rotational force in the positive direction is applied is connected to the pipe member side fixing portion 12c of the second shaft 12 at the connecting portion 13b. The second shaft 12 and the first shaft 11 are rotated forward by the positive rotational force thus generated, and the eccentric cam 20 is rotated forward.
[0048]
In the small motor 1 having such a structure, after the motor case 2 is coupled to the pump case 19, the pump case 19 is fixed to a panel in the engine room, and the flow path provided in the pump case 19 is provided on the vehicle body side. The external connection wiring is electrically connected to the control circuit and mounted on the vehicle body.
[0049]
When a current is supplied from the first brush 9 toward the second brush 10 from the control circuit, a positive rotational force is applied to the pipe member 13, so that the pipe member side fixing portion of the second shaft 12 is provided. 12c is twisted with respect to the first shaft side fixing portion 12b at one end, and rotational energy is temporarily stored in the second shaft main body 12a, and then transmitted to the first shaft 11 to rotate the armature shaft 14, As the eccentric cam 20 of the pump 18 rotates, the first and second pistons 23 and 24 reciprocate against the first and second return springs 21 and 22, and the first and second pistons 23. , 24 reciprocally move, the first and second valves 25, 26 open and close the fluid flow path, and suck and discharge the fluid.
[0050]
When the armature shaft 14 starts to rotate, the pipe member side fixing portion 12c of the second shaft 12 is twisted with respect to the first shaft side fixing portion 12b at one end, so that the second shaft main body 12a has rotational energy. In order to transmit the rotational force to the first shaft 11, the armature 5 starts to rotate with a small starting torque.
[0051]
When a current from the first brush 9 to the second brush 10 is supplied from the control circuit, the eccentric cam 20 rotates and the first and second pistons 23 and 24 reciprocate. The reciprocating motion of the first and second pistons 23 and 24 and the rotation of the eccentric cam 20 generate vibration, and the vibration is directly transmitted to the first shaft 11. The vibration transmitted to the first shaft 11 is damped while propagating from one end of the second shaft 12 to the pipe member-side fixing portion 12c at the other end. The vibration transmitted to 16 is reduced.
[0052]
4 and 5 show a second embodiment of the small motor according to the present invention, and only the periphery of the armature shaft is shown.
[0053]
In the small motor 1 in this case, the intermediate bearing 8 in the first embodiment is composed of a first intermediate bearing 27 and a second intermediate bearing 28 formed independently of the first intermediate bearing 27. The parts are the same as in the first embodiment.
[0054]
The first intermediate bearing 27 is disposed outside the other end portion of the first shaft 11, and the other end portion of the first shaft 11 is inserted into the inner peripheral portion of the first shaft 11. The other end is rotatably supported.
[0055]
The second intermediate bearing 28 is disposed on the outer side of one end of the pipe member 13, and the non-contact portion 13 c provided at one end of the pipe member 13 is inserted into the inner peripheral portion, whereby one end of the pipe member 13 is inserted. The part is supported rotatably.
[0056]
In this case, one end of the first shaft 11 is rotatably supported by the first bearing 6, while the other end is rotatably supported by the first intermediate bearing 27 independently of the pipe member 13. ing. Therefore, both ends of the relatively short first shaft 11 are securely supported at positions that are not greatly separated from each other, so that the eccentric cam of the pump 18 with respect to the cam fixing portion 11 b of the first shaft 11. Even if a bending stress is applied from 20, a large shake does not occur at the end.
[0057]
The pipe member 13 has one end rotatably supported by the second intermediate bearing 28 and the other end rotatably supported by the second bearing 7 independently of the first shaft 11. Yes. For this reason, when the second shaft 12 is twisted by the rotational force applied to the pipe member 13 to which the armature core 15 is fixed, the pipe member 13 does not receive the stress accompanying the twist.
[0058]
The second shaft 12 has one end coupled to the first shaft 11 supported by the first intermediate bearing 27 together with the other end of the first shaft 11, so that the cam of the first shaft 11 Even if a bending stress is applied from the eccentric cam 20 of the pump 18 to the fixed portion 11b, a large shake does not occur at the end portion.
[0059]
The small motor 1 in this case operates in the same manner as in the first embodiment.
[0060]
When a current is supplied from the first brush 9 toward the second brush 10 from the control circuit, a positive rotational force is applied to the pipe member 13, so that one end is the other end of the first shaft 11. In the second shaft 12, which is supported by the first intermediate bearing 27 together with the portion, while the pipe member side fixing portion 12 c at the other end is rotatably supported by the second bearing 7 together with the coupling portion 13 b of the pipe member 13. The pipe member side fixing portion 12c is twisted with respect to the first shaft side fixing portion 12b at one end, and rotational energy is temporarily stored in the second shaft body 12a, and then transmitted to the first shaft 11 to be armature shaft. 14 rotates and the eccentric cam 20 of the pump 18 rotates, so that the first and second pistons 23 and 24 move forward against the first and second return springs 21 and 22. Moving, by the first, second piston 23, 24 reciprocates, the first, second valve 25, 26 opens the flow path of the fluid, and closing, aspirating fluids, discharges.
[0061]
When the armature shaft 14 starts to rotate, the pipe member side fixing portion 12c of the second shaft 12 is twisted with respect to the first shaft side fixing portion at one end, whereby the second shaft main body 12a generates rotational energy. After the accumulation, the armature 5 starts to rotate with a small starting torque in order to transmit the rotational force to the first shaft 11.
[0062]
When a current from the first brush 9 to the second brush 10 is supplied from the control circuit, the eccentric cam 20 rotates and the first and second pistons 23 and 24 reciprocate. The reciprocating motion of the first and second pistons 23 and 24 and the rotation of the eccentric cam 20 generate vibration, and the vibration is directly transmitted to the first shaft 11. The vibration transmitted to the first shaft 11 is damped while propagating from one end of the second shaft 12 to the pipe member-side fixing portion 12c at the other end. The vibration transmitted to 16 is reduced.
[0063]
FIGS. 6 and 7 show a third embodiment of the small motor according to the present invention, and only the periphery of the armature shaft is shown.
[0064]
In the small motor 1 in this case, the first intermediate bearing 27 in the second embodiment is omitted, and the intermediate bearing 8 supports only one end of the pipe member 13 so as to be rotatable. The parts are the same as in the first embodiment.
[0065]
The intermediate bearing 8 is disposed outside the one end portion of the pipe member 13, and the non-contact portion 13 c provided at the one end portion of the pipe member 13 is inserted into the inner peripheral portion, whereby the one end portion of the pipe member 13 is inserted. It is rotatably supported.
[0066]
In this case, one end of the first shaft 11 is rotatably supported by the first bearing 6, but the other end is not supported. However, since the other end portion of the first shaft 11 is coupled to one end portion of the second shaft 12, the first and second shafts 11 and 12 are configured such that one end portion of the first shaft 11 is first. On the other hand, the other end of the pipe member 13 is rotatably supported by the second bearing 7 at the other end of the second shaft 12. It is supported by.
[0067]
The small motor 1 in this case also operates in the same manner as in the first embodiment.
[0068]
When a current is supplied from the first brush 9 toward the second brush 10 from the control circuit, a positive rotational force is applied to the pipe member 13, so that one end of the first shaft 11 is connected to the first shaft 11. In the combined body of the first shaft 11 and the second shaft 12, the other end of the second shaft 12 is rotatably supported by the second bearing 7. The pipe member side fixing portion 12c of the second shaft 12 is twisted with respect to the first shaft side fixing portion 12b at one end, and rotational energy is temporarily accumulated in the second shaft body 12a, and then the first shaft. 11, the armature shaft 14 rotates and the eccentric cam 20 of the pump 18 rotates, so that the first and second pistons 23 and 24 resist the first and second return springs 21 and 22. When the first and second pistons 23 and 24 reciprocate, the first and second valves 25 and 26 open and close the fluid flow path, and suck and discharge the fluid. To do.
[0069]
When the armature shaft 14 starts to rotate, the pipe member side fixing portion 12c of the second shaft 12 is twisted with respect to the first shaft side fixing portion at one end, whereby the second shaft main body 12a generates rotational energy. After the accumulation, the armature 5 starts to rotate with a small starting torque in order to transmit the rotational force to the first shaft 11.
[0070]
When a current from the first brush 9 to the second brush 10 is supplied from the control circuit, the eccentric cam 20 rotates and the first and second pistons 23 and 24 reciprocate. The reciprocating motion of the first and second pistons 23 and 24 and the rotation of the eccentric cam 20 generate vibration, and the vibration is directly transmitted to the first shaft 11. The vibration transmitted to the first shaft 11 is damped while propagating from one end of the second shaft 12 to the pipe member-side fixing portion 12c at the other end. The vibration transmitted to 16 is reduced.
[0071]
【The invention's effect】
According to the small motor of the first aspect of the present invention, when a rotational force is applied to the pipe member from the armature core, the second shaft accumulates the rotational energy and then transmits the rotational energy to the first shaft. Therefore, the starting torque required when the armature starts rotating is reduced. Therefore, an excellent effect that the load on the armature is reduced is achieved. Further, when the energization to the commutator is cut during the rotation of the armature, the kinetic energy of the pump piston is applied as an impact force to the first shaft through the eccentric cam, and the impact applied to the first shaft. A force is applied to one end of the second shaft. At this time, the other end of the second shaft is separated in the axial direction of the first shaft, and the other end of the pipe member is coupled to the other end of the second shaft. The impact force applied to one end of the first shaft is attenuated while it is transmitted from the other end of the first shaft to the other end of the second shaft. Therefore, the impact force applied to the first shaft is reduced and transmitted to the pipe member to which the armature core and the commutator are fixed. Therefore, since the impact on the pump side is not directly transmitted to the armature core and the commutator, there is an excellent effect that the armature does not cause rotation failure and the reliability can be improved.Further, the armature shaft is configured such that the first shaft is rotatably supported by the one end side bearing and the intermediate bearing, and the pipe member is rotatably supported by the other end side bearing and the intermediate bearing. When a rotational force is applied from the outer core, the pipe member can transmit the rotational force from the armature core to the second shaft without shaking because the other end of the pipe member is rotatably supported by the other end bearing. Also, this rotational force has an excellent effect of being smoothly transmitted to the first shaft that is rotatably supported by the intermediate bearing.
[0072]
Claims of the invention2According to the small motor according to the second shaft disposed inside the pipe member, the first shaft side fixing portion at one end of the second shaft body is coupled to the first shaft, Since the pipe member side fixing portion at the other end of the shaft main body 2 is fixed to the pipe member, the pipe member to which the armature core and the commutator are fixed is not directly coupled to the first shaft. Therefore,Effects of the Invention of Claim 1In addition, the impact force applied to the first shaft is relaxed during the period from the second shaft main body of the second shaft to the pipe member side fixing portion, and it is difficult to directly transmit to the pipe member. There is an excellent effect that power is efficiently absorbed.
[0073]
Claims of the invention3According to the small motor according to the present invention, the pipe member whose coupling portion is coupled to the pipe member side fixing portion of the second shaft has the pipe member main body arranged in a non-contact manner outside the second shaft, and the non-contact portion is Located away from the first shaft. Therefore, the claimInvention of 2 descriptionIn addition to the above effect, the impact force applied to the first shaft is not directly transmitted to the non-contact portion of the pipe member or the pipe member body of the pipe member, and thus is not transmitted to the armature core and the commutator. Excellent effect.
[0074]
Claims of the invention4According to the small motor related to the armature shaft, the pipe member isPipe member receiving portion and other end side bearing provided in the intermediate bearingWhile being rotatably supported byThe first shaft is rotatably supported by a first shaft receiving portion integrally formed with the pipe member receiving portion and the one end side bearing through an intermediate relief portion on the intermediate bearing. Therefore, in addition to the effects of the first, second, or third aspect of the invention, a bearing for supporting the other end of the first shaft and a bearing for supporting the one end of the pipe member are provided separately. The number of man-hours required for creation is greatly reduced compared toThere is an excellent effect.
[0075]
Claims of the invention5According to the small motor related to the armature shaft, the pipe member isSecond intermediate bearing and other end bearingWhile being rotatably supported byThe first shaft is rotatably supported by the one end side bearing and the first intermediate bearing. Therefore, in addition to the effect of the invention according to claim 1, 2 or 3, the pipe member transmits the rotational force applied from the armature core to the second shaft without shaking at both ends, and the first member The shaft can transmit the rotational force applied from the second shaft to the pump side without vibration at both ends.There is an excellent effect.
[Brief description of the drawings]
FIG. 1 is a partially broken front view of a first embodiment of a small motor according to the present invention.
FIG. 2 is a longitudinal side view showing an assembly relationship between an armature shaft and an armature core in the small motor shown in FIG. 1;
FIG. 3 is a perspective view illustrating a combination of an intermediate bearing and an armature shaft in the small motor shown in FIG. 1;
FIG. 4 is a longitudinal front view around an armature shaft of a second embodiment of the small motor according to the present invention.
5 is a perspective view for explaining a combination of an intermediate bearing and an armature shaft in the small motor shown in FIG. 4; FIG.
FIG. 6 is a longitudinal front view around an armature shaft of a third embodiment of the small motor according to the present invention.
7 is a perspective view for explaining a combination of an intermediate bearing and an armature shaft in the small motor shown in FIG. 6; FIG.
[Explanation of symbols]
1 Small motor
3 (Magnet) First magnet
4 (Magnet) Second magnet
6 (Bearing) (One-end bearing) First bearing
7 (Bearing) (Other end bearing) Second bearing
8 (Bearing) Intermediate bearing
8b First shaft receiving portion
8c Pipe member receiving part
8d Middle escape part
9 (Brush) 1st brush
10 (Brush) Second brush
11 First shaft
12 Second shaft
12a Second shaft body
12b 1st shaft side fixing | fixed part
12c Pipe member side fixing part
13 Pipe members
13a Pipe member body
13b joint
13c Non-contact part
14 Armature shaft
15 Armature Core
16 Commutator
17 Armature coil
18 Pump
20 Eccentric cam
27 First intermediate bearing
28 Second intermediate bearing

Claims (5)

A first shaft coupled to an eccentric cam provided in the pump, and one end coupled to the first shaft and the other end extending in the axial direction of the first shaft; An armature shaft comprising: a second shaft that can be elastically deformed by torsion between the other end portions; and a pipe member that is disposed outside the second shaft and coupled to the other end portion of the second shaft; An armature core fixed to the pipe member of the armature shaft, a commutator fixed to the pipe member in the vicinity of the armature core, and wound around the armature core and electrically connected to the commutator. Armature coils, bearings that rotatably support the armature shaft, and electrical connection to the commutator. A brush disposed on the outer side of the commutator, and a magnet disposed outside of the armature core, the bearing has one end side bearing for rotatably supporting one end portion of said first shaft, said pipe The other end side bearing that rotatably supports the other end portion of the member, and the one end side bearing and the other end side bearing are disposed between the other end portion of the first shaft and the one end portion of the pipe member. a small motor, characterized in Rukoto such and an intermediate bearing for rotatably supporting. Above the second shaft together is provided with a second shaft body of smaller outer diameter than the inner diameter of the pipe member, one end portion of the second shaft body, fitted to the first shaft together with the first shaft side fixing portion fixed is formed, the other end of the second shaft body, characterized in that the pipe member side fixing portion fixed to said pipe member is formed The small motor according to claim 1 . The aforementioned pipe member, the outside of the second shaft, the pipe member body disposed in a non-contact to the second shaft is provided, at one end of the pipe member body, said second shaft and said together with the non-contact portion is formed to be arranged in a non-contact with the first shaft, the other end of the pipe member body, coupling portion to be coupled to the pipe member side fixing portion of the second shaft is formed The small motor according to claim 2 , wherein the small motor is provided. The intermediate bearing includes a first shaft receiving portion that is disposed outside the other end portion of the first shaft and rotatably supports the other end portion of the first shaft, and one end portion of the pipe member. A pipe member receiving portion that is disposed outside the pipe member and rotatably supports one end portion of the pipe member, and is disposed between the first shaft receiving portion and the pipe member receiving portion, and the other end of the first shaft. The small motor according to any one of claims 1 to 3, wherein a non-contact middle escape portion is integrally formed with the first portion and the one end portion of the pipe member . The intermediate bearing includes a first intermediate bearing that is disposed outside the other end portion of the first shaft and rotatably supports the other end portion of the first shaft, and is independent of the first intermediate bearing. And a second intermediate bearing that is disposed outside the one end portion of the pipe member and rotatably supports the one end portion of the pipe member. 4. The small motor according to any one of 3 above .

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