JP2014152911A - Ventilation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply fix a cap to a cap receiver so as not to fall down.SOLUTION: When a worker inserts a cap 10 into an external peripheral face of a cap receiver 6, a claw piece 13 intrudes into a gap 15, and the insertion of the cap 10 into the cap receiver 6 is progressed by the fact that the claw piece 13 is pressed by a hanging wall 14 and elastically deformed. The claw piece 13 is engaged with the hanging wall 14 by an elastic recovery force, and the cap 10 is fixed to the cap receiver 6 by an engagement force of the claw piece 13 to the hanging wall 14 so as not to fall down. That is, since the cap 10 is fixed to the cap receiver 6 so as not to fall down only by the insertion of the cap 10 into the external peripheral face of the cap receiver 6 by the worker, the fixing work of the cap 10 becomes easy.

Description

  The present invention relates to a ventilation structure for ventilating a ventilation target chamber of a ventilation target member.

  Some of the ventilation structures include a cap receiver, a filter, and a cap. The cap receiver protrudes from the surface of the ventilation target member, and the cap receiver is formed with a vent hole for ventilating the ventilation target chamber. The filter covers the vent hole and is made of a porous film that allows air to pass through and does not allow foreign matters such as dust to pass through. The cap has a cylindrical shape inserted into the outer peripheral surface of the cap receiver. This cap has a top plate portion facing the filter, and prevents liquid such as oil from adhering to the filter.

JP-A-10-085536 JP 2007-230448 A

  In the case of the ventilation structure, since the cap was fixed to the cap receiver so that it could not be removed by caulking a part of the cap, a caulking jig or the like was required.

  The ventilation structure according to claim 1 is provided in a ventilation target member having a ventilation target chamber that is a target of ventilation, and is provided in a cap receiver protruding from the surface of the ventilation target member, and the cap receiver. A ventilation hole for ventilating the inside of the ventilation target chamber, a filter that covers the ventilation hole and allows air to pass therethrough and foreign substances cannot pass through, and a cylinder inserted into the outer peripheral surface of the cap receiver A cap having a top plate portion facing the filter, and an engagement wall provided on the ventilation target member and facing the outer peripheral surface of the cap receiver via a gap, An engagement piece which is provided on the cap and enters the gap between the cap receiver and the engagement wall when the cap is inserted into the outer peripheral surface of the cap receiver; The piece is pushed by the engaging wall and elastically deforms to allow the cap to be inserted into the cap receiver, and is engaged with the engaging wall with an elastic restoring force. It is characterized in that the cap is held inserted in the outer peripheral surface of the cap receiver.

  The ventilation structure according to claim 2 is provided between the cap receiver and the cap, and has a ventilation passage having one end communicating with the ventilation hole, an end surface of the cap on the ventilation target member side, and the It is provided between the members to be ventilated and is characterized in that a vent is provided for connecting the other end of the vent passage to the outside of the cap.

1. About the ventilation structure of Claim 1 The engaging piece of a cap enters into the clearance gap between a cap receiver and an engaging wall, when a cap is inserted in the outer peripheral surface of a cap receiver. The engaging piece is pushed by the engaging wall and elastically deforms to allow the cap to be inserted into the cap receiver, and the cap is capped by engaging the engaging wall with an elastic restoring force. Hold in the state of being inserted into the outer peripheral surface of the receiver. That is, since the cap is fixed to the cap receiver so that the cap cannot be removed simply by inserting the cap into the outer peripheral surface of the cap receiver, the cap can be easily fixed to the cap receiver without using a caulking jig or the like. .
2. The ventilation structure according to claim 2, the ventilation target chamber communicates with the outside of the cap through the ventilation hole, the ventilation path, and the ventilation hole, and is ventilated through the ventilation hole, the ventilation path, and the ventilation hole. For this reason, it becomes extremely difficult for liquid such as oil to reach the filter by moving along the ventilation passage from the vent, and therefore, the ventilation performance may be deteriorated due to adhesion of liquid such as oil to the filter. Is prevented.

The figure which shows Example 1 (The figure which shows the external appearance of a neutral start switch apparatus) (A) is a sectional view taken along line Xa, (b) is a sectional view taken along line Xb

  A neutral start switch device 1 in FIG. 1 is fixed to a transmission case of a vehicle, and has a case 2 corresponding to a member to be ventilated. The case 2 is formed by joining a container-like undercase 3 whose upper surface is opened and a container-like upper case 4 whose lower surface is opened with a plurality of screws, and between the undercase 3 and the upper case 4. A space-like switch chamber is formed. The switch chamber corresponds to a ventilation target chamber, and a plurality of fixed contacts are accommodated in the switch chamber.

  As shown in FIG. 1, a cylindrical rotor 5 is attached to the undercase 3 and the upper case 4. The rotor 5 is rotatable with respect to each of the undercase 3 and the upper case 4 around the axis line CL, and is connected to a shift lever of an automatic transmission device of the vehicle. The rotor 5 rotates around the axis CL in response to the shift lever being operated between a plurality of positions, and has an arm. This arm protrudes from the outer peripheral surface of the rotor 5 and is housed in the switch chamber. This arm changes its inclination state in the switch chamber according to the rotation of the rotor 5, and becomes an inclination state corresponding to the current position of the shift lever.

  A movable contact is fixed to the arm of the rotor 5. This movable contact is housed in the switch chamber, and comes into contact with one of the plurality of fixed contacts in the switch chamber corresponding to the tilted state of the arm. That is, the neutral start switch device 1 outputs an electrical signal corresponding to the current position of the shift lever when the movable contact comes into contact with one of the plurality of fixed contacts. This corresponds to a switch that outputs an electrical signal corresponding to the current position of the.

  As shown in FIG. 2, a cap receiver 6 is formed on the upper case 4. The cap receiver 6 has a cylindrical shape protruding from the surface of the upper case 4, and a vent hole 7 is formed in the cap receiver 6. The vent hole 7 penetrates the cap receiver 6 in the axial direction, and the switch chamber is connected to the vent hole 7.

  The cap receiver 6 is formed with a filter receiver 8 as shown in FIG. The filter receiver 8 has an annular shape protruding from the upper end surface of the cap receiver 6, and a filter 9 is accommodated in the filter receiver 8. The filter 9 has a disk shape, and is prevented from moving by contacting the inner peripheral surface of the filter receiver 8. This filter 9 prevents foreign matter such as dust from entering the switch chamber from the outside through the air hole 7 while ensuring the air permeability of the air hole 7, and a liquid such as water and oil cannot pass through. It is comprised from the porous membrane which has several through-holes.

  The cap receiver 6 is covered with a cap 10 as shown in FIG. The cap 10 has a cylindrical shape having a top plate portion 11 and prevents the liquid such as oil from adhering to the filter 9. The cap 10 is positioned at a target position in the vertical direction by contacting the lower case with the upper case 4. The cap 10 has a space 12 in the cap that is positioned above the filter 9. Yes.

  As shown in FIG. 2, a plurality of claw pieces 13 are formed at the lower end of the cap 10. The plurality of claw pieces 13 are arranged at an equal pitch in the circumferential direction, and a gap is formed between the claw pieces 13 adjacent in the circumferential direction. Each of the plurality of claw pieces 13 has an inclined shape directed upward as it moves away from the outer peripheral surface of the cap 10 in the radial direction, and the upward inclination state is an inclination from the gentle natural state to the upward direction. The state can be elastically deformed to an engagement state that is steeper than the natural state. Each of the plurality of claw pieces 13 corresponds to an engagement piece.

  As shown in FIG. 2, the upper case 4 is formed with a hooking wall 14 corresponding to the engaging wall. The hook wall 14 has a cylindrical shape surrounding the cap 10, and the axial height dimension of the hook wall 14 is set lower than the axial height dimension of the cap receiver 6. A gap 15 is formed between the inner peripheral surface of the hook wall 14 and the outer peripheral surface of the cap receiver 6. The width dimension in the radial direction of the gap 15 is set to be smaller than the radial width dimension in the natural state of each of the plurality of claw pieces 13. Has been inserted.

  As shown in FIG. 2, each of the plurality of claw pieces 13 enters the gap 15 when the cap 10 is inserted into the outer peripheral surface of the cap receiver 6 from above, and the inner peripheral surface of the hooking wall 14. The insertion of the cap 10 into the cap receiver 6 is allowed to proceed by being elastically deformed from the natural state to the engaged state. Each of the plurality of claw pieces 13 holds the cap 10 in an inserted state inserted into the outer peripheral surface of the cap receiver 6 by engaging the inner peripheral surface of the hooking wall 14 with an elastic restoring force. 10 is fixed on the outer peripheral surface of the cap receiver 6 so as not to fall off by being inserted from above.

  As shown in FIG. 2, the cap receiver 6 is formed with a ventilation groove 16. The ventilation groove portion 16 has a linear shape directed along the axial direction of the cap receiver 6 and has a slit shape with an outer peripheral surface opened. The ventilation groove portion 16 is provided between the cap receiver 6 and the cap 10, and the upper end portion of the ventilation groove portion 16 communicates with the ventilation hole 7 through the cap inner space portion 12. The ventilation groove portion 16 corresponds to a ventilation passage.

  As shown in FIG. 2, the lower end portion of the ventilation groove portion 16 communicates with the outside of the cap 10 through the ventilation recess portion 17, and the switch chamber has the ventilation hole 7, the cap internal space portion 12, the ventilation groove portion 16, and the ventilation recess portion 17. The change in pressure and the change in temperature are alleviated by aeration through the air. The ventilation recess 17 is disposed in a gap between the claw pieces 13 adjacent to each other in the circumferential direction when viewed from the axial direction, and is formed by cutting a part of each of the upper case 4 and the hooking wall 14. It has a concave shape. The ventilation recess 17 is provided between the lower end surface of the cap 10 and the upper case 4 and corresponds to a ventilation hole.

According to the said Example 1, there exists the following effect.
When the operator inserts the cap 10 into the outer peripheral surface of the cap receiver 6, each of the plurality of claw pieces 13 enters the gap 15, and each of the plurality of claw pieces 13 is pushed by the inner peripheral surface of the hooking wall 14. Then, the cap 10 is inserted into the cap receiver 6 by being elastically deformed. Each of the plurality of claw pieces 13 is engaged with the inner peripheral surface of the hooking wall 14 by elastic restoring force, and the cap 10 is attached to the cap receiver 6 by the engaging force of the plurality of claw pieces 13 with respect to the hooking wall 14. It is fixed so that it cannot be removed. That is, the cap 10 is fixed to the cap receiver 6 so that the cap 10 cannot be removed simply by inserting the cap 10 into the outer peripheral surface of the cap receiver 6, so that the cap 10 can be removed without using a caulking jig or the like. Easy to fix.

  The switch chamber of the neutral start switch device 1 communicates with the outside of the cap 10 through the vent hole 7, the vent groove portion 16, and the vent recess portion 17, and is ventilated through the vent holes 7 to 17. For this reason, it becomes extremely difficult for liquid such as oil to reach the filter 9 by rising along the ventilation groove portion 16 from the ventilation recess portion 17, so that the ventilation performance is improved when the liquid such as oil adheres to the filter 9. Decrease is prevented.

In the first embodiment, the ventilation groove 16 may be bent. In this case, a liquid such as oil is more difficult to reach the filter 9 from the ventilation recess 17 through the ventilation groove 16.
In the first embodiment, the cap 10 may be provided with a notched vent opening that opens downward.

In the first embodiment, the cap 10 may be provided with a ventilation passage protruding in the radial direction from the outer peripheral surface of the cap 10.
In the first embodiment, the plurality of claw pieces 13 of the cap 10 may be arranged at a nonuniform pitch in the circumferential direction.

In the first embodiment, the claw piece 13 may be provided on the entire circumference of the cap 10 excluding the ventilation recess 17.
In the first embodiment, the present invention may be applied to devices other than the neutral start switch device 1 of the vehicle. In short, by ensuring the ventilation between the inside and outside of the ventilation target chamber, What is necessary is just to apply to the whole ventilation structure which relieves a temperature change.

  2 is a case (a member to be ventilated), 6 is a cap holder, 7 is a vent hole, 9 is a filter, 10 is a cap, 11 is a top plate, 13 is a claw piece (engagement piece), 14 is a hooking wall (engagement) 15 is a gap, 16 is a ventilation groove (ventilation passage), and 17 is a ventilation recess (vent).

Claims (2)

A cap receiver that is provided in a ventilation target member having a ventilation target chamber to be vented, and that protrudes from a surface of the ventilation target member;
A vent hole provided in the cap receiver for ventilating the chamber to be vented;
A filter that covers the vent hole and allows air to pass therethrough and foreign matter cannot pass through;
A cap inserted in the outer peripheral surface of the cap receiver, the cap having a top plate portion facing the filter;
An engagement wall that is provided on the ventilation target member and faces the outer peripheral surface of the cap receiver via a gap;
An engagement piece which is provided on the cap and enters the gap between the cap receiver and the engagement wall when the cap is inserted into the outer peripheral surface of the cap receiver;
The engaging piece is
The cap is allowed to be inserted into the cap receiver by being elastically deformed by being pushed by the engagement wall, and the cap is moved by engaging the engagement wall with an elastic restoring force. A ventilation structure characterized by being held in a state of being inserted into the outer peripheral surface of the cap receiver. A vent passage provided between the cap receiver and the cap, wherein one end portion communicates with the vent hole;
The cap is provided between an end surface on the ventilation target member side of the cap and the ventilation target member, and further includes a vent opening that connects the other end of the ventilation passage to the outside of the cap. The ventilation structure according to claim 1.

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