JP5184443B2 - Harness extraction structure - Google Patents

Description

  The present invention relates to a harness take-out structure including a corrugated tube that allows a harness to be inserted and protected.

  For example, a harness taken out from a brush portion or the like of an electric motor is protected by being inserted into the corrugated tube and covered with the corrugated tube.

  Patent Documents 1 and 2 disclose a structure in which a tip portion of a corrugated tube is attached to a mother machine.

JP 9-327111 A JP 2006-191704 A

  For example, in the case of a waterproof electric motor, it is necessary to apply a sealer or the like to the clearance between the harness take-out portions and seal it so that water does not enter.

  In the conventional harness extraction structure including the corrugated tube, there is a problem that it is difficult to seal the harness extraction portion with respect to the mother machine because there is a gap between the corrugated tube and the harness.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a harness take-out structure that prevents water from the outside from entering the mother machine without applying a sealer or the like. To do.

  The present invention includes a harness that is taken out from the mount of the mother machine and a corrugated tube through which the harness is inserted, and is a harness take-out structure that connects the tip of the corrugated tube to the mount, and the tip of the corrugated tube is mounted A pair of connector housings connected to each other, and a waterproof packing interposed between the connector housings and allowing the harness to pass therethrough, the connector housing having a receiving recess for receiving the waterproof packing and an extraction hole for inserting the mount harness. A waterproof packing that seals between the connector housing and the harness.

  According to the present invention, the inlay portion of the connector housing is fitted into the mount extraction hole, and the waterproof packing seals between the connector housing and the harness, so that water or the like from the outside can be mounted without applying a sealer or the like. Intrusion into the mother machine through the take-out hole is prevented.

The longitudinal cross-sectional view of the electric motor which shows embodiment of this invention. The front view and side view of an electric motor similarly. The longitudinal cross-sectional view of a harness extraction structure similarly. The perspective view of a connector housing similarly. Similarly, four views of the connector housing. The perspective view of waterproof packing similarly.

  Hereinafter, an embodiment in which the present invention is applied to a harness extraction structure provided in an electric motor will be described with reference to the accompanying drawings.

  An electric motor 1 shown in FIG. 1 constitutes an electric hydraulic actuator (mini motion package) (not shown).

  The electric hydraulic actuator is a hydraulic pressure that pumps hydraulic fluid (operating fluid such as oil or water-soluble alternative fluid) in both forward and reverse directions by rotating the electric motor 1 and the electric motor 1 shown in FIG. A pump, a hydraulic cylinder that expands and contracts with hydraulic fluid discharged from the hydraulic pump, a tank that stores hydraulic fluid, a valve that controls the flow of hydraulic fluid, and the like are provided.

  As a result, the electric hydraulic actuator does not need to be provided with equipment such as hydraulic piping, and can extend and contract the hydraulic cylinder.

  This type of electric hydraulic actuator is disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2006-200598 and 2001-182716.

  FIG. 1 is a longitudinal sectional view of the electric motor 1. Hereinafter, the configuration of the electric motor 1 will be described.

  The electric motor 1 includes a bottomed cylindrical case 2, a permanent magnet 4 disposed inside the case 2, a bracket 3 attached to the opening of the case 2, and a ball bearing fixed to the bottom of the case 2. 7 and a shaft 9 rotatably supported by a ball bearing 8 fixed to the inner periphery of the bracket 3, and a rotor 10 provided on the shaft 9.

  In the electric motor 1, electricity supplied from a power source (not shown) flows into the winding 14 of the rotor 10 through the lead wire 15, the lead plate 20, the brush 16, and the commutator 17, so that the magnetic force generated in the rotor 10 is permanent. The shaft 9 is driven to rotate by acting in the rotation direction with respect to the magnetic force of the magnet 4.

  The electric motor 1 includes a metal case 2 and a resin bracket 3 as its casing (housing). A bracket 3 is fitted to the open end of the cylindrical case 2, and a motor chamber 11 is defined inside the case 2 and the bracket 3. The motor chamber 11 houses the rotor 10, the commutator 17, the brush 16, and the like.

  The electric motor 1 includes a cap 18 that fits inside the bracket 3. A seal 19 is interposed between the cap 18 and the shaft 9, and the sliding portion of the shaft 9 is sealed by the seal 19.

  FIG. 2A is a front view of the electric motor 1. The bracket 3 has a flange portion 32 that expands in an annular shape, and a plurality of bolt holes 33 are opened in the flange portion 32. The flange portion 32 is fastened to the body 100 (see FIG. 1) of the electric hydraulic actuator via a bolt (not shown) that passes through the bolt hole 33.

  FIG. 2B is a side view of the electric motor 1. The bracket 3 has a cylindrical mount 35 that protrudes from the outer periphery of the bracket 3 in the outer diameter direction. As a harness that is taken out from the electric motor 1, two lead wires 15 are taken out through the inside of the mount 35.

  FIG. 3 is a cross-sectional view of the harness take-out structure shown by enlarging the periphery of the lead wire 15 of FIG.

  The lead wire 15 has a wire 15a made of a conductive material and a resin coating 15b made of an insulating material. At one end of the lead wire 15 drawn into the motor chamber 11, a wire 15a protruding from the coating 15b is fixed to the lead plate 20 by spot welding.

  As shown in FIG. 2A, two extraction holes 36 are formed in the mount 35, and the lead wire 15 is inserted into the extraction hole 36.

  A cylindrical grommet 40 is attached to the two lead wires 15. The grommet 40 is formed of a flexible resin material such as rubber, and is fitted and attached to the outer surface of the coating 15b of the lead wire 15.

  As shown in FIG. 3, the extraction hole 36 has a small diameter hole 37 and a large diameter hole 38. On the other hand, the grommet 40 has a stepped shape that fits over the small diameter hole 37 and the large diameter hole 38. The grommet 40 is compressed and interposed between the take-out hole 36 and the lead wire 15, thereby sealing between the two.

  A corrugated tube 50 is provided to cover the lead wire 15 taken out of the electric motor 1. In the corrugated tube 50, the annular valley portions 51 and the annular mountain portions 52 are alternately arranged, and the cross section thereof is formed in an uneven shape. A gap is provided between the inner surface of the corrugated tube 50 and the two lead wires 15. The corrugated tube 50 is made of a flexible resin material, has appropriate rigidity and flexibility, and protects the lead wire 15.

  The harness extraction structure of the electric motor 1 includes a pair of connector housings 60 that hold the tip of the corrugated tube 50, and the tip of the corrugated tube 50 is connected to the bracket 3 via the connector housing 60.

  As shown in FIG. 2B, the pair of connector housings 60 come into contact with each other along the surface S perpendicular to the rotation axis direction of the electric motor 1, and hold the distal end portion of the corrugated tube 50.

  Hereinafter, the shape of the connector housing 60 will be described. The pair of connector housings 60 have the same shape and are integrally formed by molding resin.

  FIG. 4 is a perspective view of the connector housing 60. 5, (a) is a plan view of the connector housing 60 as viewed from above, (b) is a front view of the connector housing 60, (c) is a plan view of the connector housing 60 as viewed from below, and (d) is a connector. 4 is a side view of a housing 60. FIG.

  Each connector housing 60 has a combined contact surface 61 that contacts each other and a combined hook 62 that combines the two.

  The united hook 62 protrudes from one end of the united contact surface 61 and has a claw 62a at its tip. The united hook 62 is formed so as to protrude in the direction of the rotational axis of the electric motor 1 from the united contact surface 61 along the surface S orthogonal to the direction of the rotational axis of the electric motor 1.

  A hook engaging hole 63 is opened in the combined contact surface 61. The combined hook 62 of the mating connector housing 60 is inserted into the hook engaging hole 63, and the claw portion 62 a of the combined hook 62 is engaged with the opening edge of the hook engaging hole 63. Thereby, a pair of connector housing 60 unites so that each uniting contact surface 61 may not leave | separate.

  The connector housing 60 has a securing portion 68 that engages with the distal end portion of the corrugated tube 50. The tying portion 68 extends in a semicircular shape along the tip portion of the corrugated tube 50 and has a cross-sectional shape along the annular valley portion 51 and the annular mountain portion 52 of the corrugated tube 50. When the connector housings 60 are combined, the semi-annular securing portion 68 is annularly engaged over substantially the entire circumference of the annular valley portion 51 and the annular mountain portion 52, and the distal end portion of the corrugated tube 50 is attached to the bracket 3. Hold it against misalignment.

  The connector housing 60 has two inlay portions 71 that fit into the extraction holes 36 of the mount 35. Each spigot part 71 protrudes in a semi-cylindrical shape, and constitutes two cylindrical-shaped parts fitted in each take-out hole 36 when the respective combined hooks 62 are combined. The connector housing 60 is positioned with respect to the take-out hole 36 of the mount 35 by fitting the outer peripheral surface 71 a of each spigot part 71 into the large-diameter hole 38 of the take-out hole 36.

  As shown in FIG. 5C, the facing surface 71 c of each spigot portion 71 is formed to be offset with respect to the combined contact surface 61. The facing surfaces 71c of the respective spigot portions 71 face each other with a gap when the combined hooks 62 are combined. When the respective spigot portions 71 are fitted into the take-out holes 36, the slit-like gaps sandwiched between the respective facing surfaces 71 c of the respective spigot portions 71 are contracted, so that the outer peripheral surfaces 71 a of the respective spigot portions 71 are connected to the take-out holes 36. Fits smoothly into the large-diameter hole 38.

  As shown in FIG. 3, when each spigot portion 71 is fitted into the take-out hole 36, the tip end surface 71 b of the spigot portion 71 comes into contact with the end surface 40 a of the grommet 40. The cylindrical grommet 40 is held between the distal end surface 71b of the spigot portion 71 and the annular step portion 39 of the extraction hole 36, thereby reducing the sealing performance between the lead wire 15 and the extraction hole 36 due to vibration. To prevent.

  As shown in FIG. 3, the connector housing 60 has a connection recess 72 around the base end portion of each spigot portion 71. The connecting recess 72 is fitted to the tip 35 a of the mount 35. Thereby, the connector housing 60 is positioned with respect to the mount 35.

  The connector housing 60 has two connecting hooks 65 that engage with the mount 35 and prevent the connector housing 60 from coming off.

  The connecting hook 65 protrudes from both ends of the connector housing 60 and has a claw portion 65a at the tip. The connecting hook 65 protrudes in a direction orthogonal to the rotation axis of the electric motor 1.

  As shown in FIGS. 2A and 2B, the mount 35 is integrally formed with a pair of hook engaging frame portions 34. The hook engaging frame portion 34 protrudes from the side portion of the mount 35 into a rectangular frame shape.

  In a state where the connector housings 60 are joined together, the four connecting hooks 65 are fitted into the hook engaging frame portions 34 as the respective spigot portions 71 are inserted into the respective extraction holes 36 of the mount 35. The As a result, the respective hooks 65a of the connecting hooks 65 are engaged with the lower surface of the hook engaging frame portion 34, and the connector housings 60 are connected so as not to be separated from the mount 35.

  As shown in FIG. 3, a waterproof packing 80 is interposed inside each connector housing 60. The waterproof packing 80 is formed of a flexible resin material such as rubber, and seals between the lead wire 15 and each connector housing 60.

  As shown in FIG. 6, the waterproof packing 80 is formed in a rectangular parallelepiped block shape and has insertion holes 81 through which the lead wires 15 are inserted.

  The connector housing 60 has a housing recess 75 for housing the waterproof packing 80. The housing recess 75 is formed between the spigot part 71 and the securing part 68.

  The accommodating recess 75 defines a rectangular parallelepiped space having a size slightly smaller than the outer diameter of the waterproof packing 80 in a free state.

  When the connector housings 60 are assembled, after the waterproof packing 80 is interposed between the housing recesses 75, the united hooks 62 are engaged with the hook engaging holes 63, and the connector housings 60 are united. The waterproof packing 80 is compressed between the receiving recesses 75 so that the outer surface thereof is in close contact with the receiving recesses 75, and the inner surface of the insertion hole 81 is in close contact with the outer surface of the lead wire 15. And the connector housing 60 are sealed.

  The inlay portion 71 is fitted in the take-out hole 36 of the mount 35, and the waterproof packing 80 seals between the connector housing 60 and the harness (lead wire 15), and the front end surface 71 b of the inlay portion 71 is connected to the end surface 40 a of the grommet 40. The grommet 40 seals between the take-out hole 36 of the mount 35 and the spigot 71 of the connector housing 60, so that water or the like from the outside passes through the take-out hole 36 of the mount 35 and enters the mother machine (electric motor 1). Intrusion is prevented.

  Hereinafter, a procedure for assembling the lead wire 15 to the electric motor 1 will be described.

  -Insert the two lead wires 15 through the corrugated tube 50.

  Each lead wire 15 is inserted through the insertion hole 81 of the waterproof packing 80.

  The mating hooks 62 are engaged with the hook engaging holes 63 so that the two connector housings 60 are merged, so that the waterproof packing 80 is interposed between the accommodating recesses 75 and the tying portion 68 is corrugated. Engage with the tip of the tube 50.

-Insert each lead wire 15 into each grommet 40.
Thereby, the harness assembly in which the corrugated tube 50, the connector housing 60, the waterproof packing 80, the grommet 40, and the like are assembled is provided.

  Each lead wire 15 is fitted to each take-out hole 36 of the mount 35 through the grommet 40, and the spigot portion 71 of each connector housing 60 combined with each other is inserted into each take-out hole 36 of the mount 35, and each connection hook 65 is engaged with the hook engaging frame portion 34 to connect the connector housings 60 to the mount 35 so as not to be separated.

  By combining the connector housings 60 so as not to be separated from each other via the combined hooks 62, it is possible to provide a harness assembly in which the connector housing 60 and the like are assembled at the distal end portion of the corrugated tube 50. Productivity can be increased by reducing the number of assemblies.

  Since the connector housing 60 is connected to the mount 35 via the connection hook 65 so as not to be separated, the connector housing 60 does not have a portion surrounding the collar portion formed in the mount as in the conventional device. Is peeled off. Accordingly, in a state where the connector housing 60 is connected to the mount 35, the connector housing 60 is prevented from interfering with the body 100 of the adjacent electric hydraulic actuator, and the mother machine (electric motor 1) can be reduced in size. .

  The connector housing 60 is positioned with respect to the mount 35 by fitting the connector housing 60 into the extraction hole 36 through which the lead wire 15 of the mount 35 is inserted through the inlay portion 71. The protruding length is shortened, the degree of freedom of bending of the corrugated tube 50 is ensured, and the cableability in the narrow portion can be improved.

  As described above, in the present embodiment, the harness (lead wire 15) taken out from the mount 35 of the mother machine (electric motor 1) and the corrugated tube 50 through which the harness is inserted are provided, and the distal end portion of the corrugated tube 50 is provided. And a pair of connector housings 60 that connect the tip of the corrugated tube 50 to the mount 35, and a waterproof packing 80 that is interposed between the connector housings 60 and allows the harness to pass therethrough. The connector housing 60 includes a housing recess 75 for housing the waterproof packing 80 and an inlay portion 71 that fits into the take-out hole 36 through which the harness of the mount 35 is inserted, and the waterproof packing 80 is connected to the connector housing 60. It was set as the structure which seals between harnesses.

  Based on the above configuration, the inlay portion 71 is fitted into the take-out hole 36 of the mount 35 and the waterproof packing 80 seals between the connector housing 60 and the harness, so that it is not necessary to apply a sealer or the like, and water from the outside And the like are prevented from entering the mother machine (electric motor 1) through the take-out hole 36 of the mount 35.

  In the present embodiment, the grommet 40 through which the harness is inserted is provided, the grommet 40 is interposed in the take-out hole 36 of the mount 35, and the leading end surface 71 b of the spigot portion 71 is in contact with the end surface 40 a of the grommet 40.

  Based on the above configuration, the grommet 40 seals between the take-out hole 36 of the mount 35 and the spigot 71 of the connector housing 60, so that water or the like from the outside passes through the take-out hole 36 of the mount 35 and the mother machine (electric motor 1 ) Is prevented from entering.

  In the present embodiment, the pair of connector housings 60 combined with each other are configured to have the same shape.

  Based on the above configuration, the pair of connector housings 60 are made common to each other, the types of parts are reduced, and the cost of the product is reduced.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

1 Electric motor (mother machine)
15 Lead wire (harness)
35 mount 36 extraction hole 40 grommet 40a grommet end face 50 corrugated tube 60 connector housing 71 spigot part 72 connecting recess 75 receiving recess 80 waterproof packing

Claims (3)

A harness removed from the mount of the mother machine,
With a corrugated tube that allows this harness to pass through,
A harness extraction structure for connecting the tip of the corrugated tube to the mount,
A pair of connector housings connecting the tip of the corrugated tube to the mount;
A waterproof packing interposed between the connector housings and allowing the harness to pass therethrough,
The connector housing is
A housing recess for housing the waterproof packing;
An inlay portion that fits into an extraction hole through which the harness of the mount is inserted, and
The harness take-out structure, wherein the waterproof packing seals between the connector housing and the harness. A grommet for inserting the harness;
This grommet is inserted in the take-out hole of the mount,
The harness take-out structure according to claim 1, wherein a front end surface of the spigot part abuts on an end surface of the grommet.   3. The harness take-out structure according to claim 1, wherein the pair of connector housings combined with each other have the same shape.