JP6477393B2 - Hydraulic switch unit and automatic transmission - Google Patents

Description

  The present invention relates to a hydraulic switch unit that monitors a working hydraulic pressure in a valve body, and an automatic transmission that includes the valve body and the hydraulic switch unit.

  In general, an automatic transmission mounted on a vehicle such as an automobile switches the speed ratio by fastening / releasing fastening elements such as a multi-plate clutch and a multi-plate brake provided therein. The fastening element is operated by hydraulic pressure, and the hydraulic pressure is controlled by a valve provided in the valve body. The valve body is provided with a hydraulic switch module that detects the hydraulic pressure in the valve body, and detects that the working hydraulic pressure is normally supplied by the hydraulic switch module.

  Conventionally, it has a first electrode and a second electrode formed of a conductive metal, and the first electrode and the second electrode are brought into contact with each other by an operating hydraulic pressure in the valve body to be electrically connected, and an electric signal is transmitted. A hydraulic switch module that outputs to an electronic control device has been proposed (see Patent Document 1).

JP 2013-171614 A

  In many conventional automatic transmissions, the valve body is disposed below the automatic transmission, and the hydraulic switch module is often disposed further below the valve body. For this reason, the hydraulic switch module is immersed in oil, and the oil easily flows into the space in which the first electrode and the second electrode are provided. However, in recent years, in automatic transmissions that are restricted in the height direction, the number of valve bodies disposed on the side of the automatic transmission has increased, and the hydraulic switch module is often disposed on the side of the valve body. It is becoming. In this case, the hydraulic switch module described in Patent Document 1 cannot be immersed in oil, and the oil does not easily flow into the space in which the first electrode and the second electrode are provided. The oil pressure generated by the oil pump pulsates not a little, and the second electrode deformed by the oil pressure is vibrated, so that the oil in the space vibrates such as contact between the first electrode and the second electrode. May generate heat and vaporize. Furthermore, when the oil repeatedly evaporates, there is a problem in that the insulator in the oil gradually adheres to the first electrode and the second electrode, causing poor conduction.

  Therefore, an object of the present invention is to provide a hydraulic switch unit and an automatic transmission that can prevent the occurrence of poor conduction of the hydraulic switch.

The hydraulic switch unit according to the present invention includes a hydraulic switch for monitoring the operating hydraulic pressure in the valve body,
A mating surface to be attached to an outer mounting surface of the valve body, and a housing into which the hydraulic switch is inserted from the mating surface side,
The hydraulic switch includes a contact portion that contacts and separates according to the hydraulic pressure,
A communication hole through which the mating surface and the space provided with the contact portion communicate with each other to flow in oil;
The mating surface has an opening that opens outside the mating surface of the housing, and has a groove formed from the opening toward the communication hole.

An automatic transmission according to the present invention includes a valve body,
A hydraulic switch that monitors the hydraulic pressure in the valve body; and a housing that is provided with a mating surface that is attached to an outer mounting surface of the valve body and into which the hydraulic switch is inserted from the mating surface side. A hydraulic switch unit,
The hydraulic switch includes a contact portion that contacts and separates according to the hydraulic pressure,
A communication hole through which the mating surface and the space provided with the contact portion communicate with each other to flow in oil;
At least one of the mounting surface and the mating surface has an opening that opens to the outside other than the mounting surface and the mating surface, and has a groove formed from the opening toward the communication hole.

  According to the present invention, since the groove toward the communication hole from the outside is formed, the oil easily flows into the communication hole and enters the space where the contact portion is provided through the communication hole. For this reason, even when the hydraulic switch is not immersed in the oil, the oil flows into the space, so that heat generation of the oil and evaporation due to the heat generation are reduced. For this reason, solid matter in the oil becomes difficult to adhere to the contact portion, and the occurrence of poor conduction is prevented.

The upper view style figure which shows the automatic transmission which concerns on embodiment of this invention. The front view which shows the valve body and hydraulic switch unit which were provided in the said automatic transmission. It is a figure which shows the said hydraulic switch unit, (a) is a rear view, (b) is sectional drawing cut | disconnected between XX. It is a figure which shows the said hydraulic switch unit, (a) is a rear view, (b) is sectional drawing cut | disconnected between YY.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an automatic transmission 1 for an FF (front engine / front drive system) vehicle is placed horizontally with respect to the traveling direction, and the torque converter 2 and the transmission mechanism 3 are arranged in the traveling direction. In contrast, they are arranged in a single line on the left and right. The torque converter 2 transmits the rotational power of the engine to the transmission mechanism unit 3 via oil, and the transmission mechanism unit 3 adjusts the speed of the rotational power transmitted from the torque converter 2. A differential 5 is provided below the transmission mechanism unit 3, and rotational power from the transmission mechanism unit 3 is transmitted to the left and right front wheels via the differential 5.

  Fastening elements such as a multi-plate clutch and a multi-plate brake are arranged inside the speed change mechanism unit 3, and the speed ratio is switched by fastening / release of the fastening elements.

  The fastening element is actuated by hydraulic pressure, and the hydraulic pressure is controlled by a valve body 6 disposed on the side of the speed change mechanism portion 3. In particular, as shown in FIG. 2, the hydraulic pressure is controlled by a solenoid 7 disposed on the side of the valve body 6 opposite to the space where the fastening element is provided with the valve body 6 interposed therebetween. Further, mounting surfaces 9 and 10 are disposed on the same side of the valve body 6 as the solenoid 7, and hydraulic switch units 11 and 12 for monitoring the operating oil pressure in the valve body 6 are provided on the mounting surfaces 9 and 10. It is attached. A failure of the solenoid 7 or the like is detected by the hydraulic switch units 11 and 12.

  The hydraulic switch unit 12 will be described with reference to the drawings. As shown in FIGS. 3A and 4A, the hydraulic switch unit 12 includes a first hydraulic switch 13 and a second hydraulic switch 15 that detect operating hydraulic pressure, a first hydraulic switch 13 and a first hydraulic switch 13. And a housing 16 for accommodating two hydraulic switches 15. The housing 16 is bolted and fixed to the valve body 6 while pressing the first hydraulic switch 13 and the second hydraulic switch 15 against the mounting surface 10.

  Since the first hydraulic switch 13 and the second hydraulic switch 15 are arranged side by side in the top and bottom and both have the same structure, only the structure of the first hydraulic switch 13 arranged above will be described. The description of the hydraulic switch 15 is omitted. As shown in FIGS. 4A and 4B, the first hydraulic switch 13 has a cylindrical side wall portion 17, and an open end 17 </ b> A of the side wall portion 17 is attached to the valve body 6. It is provided so as to cover the hydraulic oil outlet hole (not shown) provided on the surface 10. A ring-shaped annular part 19 that is slightly smaller than the side wall part 17 is fitted inside the side wall part 17, and the inside of the side wall part 17 is covered with the annular part 19 from the middle part to the opening end 17 </ b> A. The annular part 19 is pressed against the mounting surface 10 so as to cover the outlet hole, and seals so that the hydraulic pressure does not leak from between the outlet hole and the annular part 19. At the opening end 19A on the middle side of the side wall portion 17 of the annular component 19, a film-like film 20 and a conductive plate 21 formed in a plate shape that can be deformed with a conductive metal close the opening of the opening end 19A. The film-like film 20 is in close contact with the opening end 19A. On the opposite side of the annular component 19 with the conductive plate 21 in between, a protruding portion 22 that protrudes further inward from the inside of the side wall portion 17 is formed, and the tip of the protruding portion 22 is formed of a conductive metal. A first electrode 23 is attached. The film 20 is sandwiched and fixed between the annular component 19 and the protrusion 22, and the conductive plate 21 is sandwiched and fixed between the film 20 and the first electrode 23. The hydraulic pressure in the valve body 6 enters a space surrounded by the annular part 19 and the film 20, and the conductive plate 21 is pressed and deformed through the film 20 by the hydraulic pressure.

  On the side of the opening end 17B that opens to the side opposite to the opening end 17A of the side wall portion 17, a bottom portion 25 is disposed so as to close the opening of the opening end 17B. However, the bottom portion 25 is not in close contact with the side wall portion 17, and a liquid such as oil can flow between the bottom portion 25 and the side wall portion 17. A second electrode (contact point) 26 made of a conductive metal is disposed at the center of the bottom 25. The bottom 25 and the second electrode 26 are separated without contacting the conductive plate 21, but when the conductive plate 21 is pressed by the operating hydraulic pressure in the valve body 6, the conductive plate 21 is brought into contact with the second electrode 26. Deforms toward. That is, the second electrode 26 is brought into contact with and separated from the conductive plate 21 by the hydraulic pressure. The first electrode 23 and the second electrode 26 have end portions 23A and 26A that extend to the outside of the side wall portion 17 and protrude, and the end portion 23A of the first electrode 23 has a side wall. The portion 17 protrudes outward from one of the diameter directions. The end portion 26A of the second electrode 26 protrudes outward from the other diameter direction.

  As shown in FIGS. 4A and 4B, the housing 16 has a housing main body 27. The first hydraulic switch 13 and the second hydraulic switch 15 are fitted into the housing main body 27, and the valve Movement in the sliding direction relative to the body 6 is restricted. The housing 16 further includes a pressing portion 29 that presses the housing main body 27 and the first hydraulic switch 13 and the second hydraulic switch 15 fixed to the housing main body 27 against the mounting surface 10.

  The housing body 27 includes a mating surface 30 that is attached to the mounting surface 10 and a pressing surface 31 that faces the mating surface 30. The housing body 27 includes a side surface 27A that connects the upper surfaces of the mating surface 30 and the pressing surface 31, a side surface 27B that connects the lower surface of the mating surface 30 and the pressing surface 31, a side surface 27C that extends vertically and connects the side surfaces 27A and 27B, and And a side surface 27D. Tube portions 41, 42, 43 formed by insert formation are provided at three locations of the upper end portion, the middle portion, and the lower end portion of the housing body 27, and the tube portions 41, 42, 43 are pressed from the mating surface 30. It is formed to penetrate to the surface 31. A storage hole 36 is formed by penetrating from the mating surface 30 to the pressing surface 31 between the upper end tubular portion 41 and the middle tubular portion 42. The first hydraulic switch 13 is fitted in the storage hole 36 from the mating surface 30 side. However, the outer side surface of the side wall 17 of the first hydraulic switch 13 is not in close contact with the inner wall of the storage hole 36, and there is a gap through which oil can flow between the inner wall of the storage hole 36. A storage hole 37 is also formed between the middle cylindrical portion 42 and the lower cylindrical portion 43 so as to penetrate from the mating surface 30 to the pressing surface 31. The second hydraulic switch 15 is fitted into the storage hole 37 from the mating surface 30 side. However, the outer side surface of the side wall 17 of the second hydraulic switch 15 is not in close contact with the inner wall of the storage hole 37, and there is a gap through which oil can flow between the inner wall of the storage hole 37. Inside the housing main body 27, passage holes (not shown) through which electric wires extending from the end portions 23A and 26A of the first hydraulic switch 13 and the second hydraulic switch 15 are formed. The passage hole extends from the side surface 27 </ b> D of the housing body 27 to the connecting portion 39, and the electric wire also extends to the connecting portion 39. The electric wire is connected to a control unit (ECU) that controls the solenoid 7 and transmits signals of the first hydraulic switch 13 and the second hydraulic switch 15 to the control unit.

  The pressing portion 29 has a plate-like plate portion 40 that presses the pressing surface 31 of the housing main body 27 and the bottom portions 25 of the first hydraulic switch 13 and the second hydraulic switch 15. The plate portion 40 is formed with holes (not shown) penetrating the plate portion 40 on the extensions of the tube portions 41, 42, and 43, and the holes respectively pass through the inside of the tube portions 41, 42, and 43. It communicates with the through-hole. Open ends 41A, 42A, 43A on the valve body 6 side of the cylindrical portions 41 to 43 protrude from the mating surface 30 to the mounting surface 10, and similarly, the first hydraulic switch 13 and the second hydraulic switch 15 are provided. The opening end 17 </ b> A of the side wall portion 17 also protrudes from the mating surface 30 toward the mounting surface 10. Bolts are passed through the cylindrical portions 41 to 43, and the bolts are fastened to the valve body 6, whereby the annular component 19 covers the hydraulic oil outlet hole provided in the mounting surface 10 and is pressed against the mounting surface 10. . By being pressed, the annular component 19 comes into close contact with the mounting surface 10. When the bolt is further tightened to the valve body 6, the open ends 41 </ b> A, 42 </ b> A, 43 </ b> A come into contact with the mounting surface 10 and are fixed.

  Two breathing holes (communication holes) 45 </ b> A to 45 </ b> D are provided at the bottom 25 of the first hydraulic switch 13 and the second hydraulic switch 15, respectively. The breathing holes 45 </ b> A to 45 </ b> D are cut away from the surface in contact with the side wall part 17 toward the cylinder axis of the side wall part 17, and the breathing holes 45 </ b> A and 45 </ b> B At the center, they are arranged 180 degrees opposite to each other. Similarly, the breathing holes 45C and 45D are arranged in a positional relationship opposite to each other by 180 degrees around the cylinder axis of the side wall portion 17 of the second hydraulic switch 15. The breathing hole 45A and the breathing hole 45C are disposed closer to the side surface 27C than the side surface 27D in the housing main body 27, and the breathing hole 45B and the breathing hole 45D are disposed closer to the side surface 27D than the side surface 27C. One end of each of the breathing holes 45 </ b> A to 45 </ b> D leads to a space S <b> 1 sandwiched between the side wall portion 17 and the pressing portion 29 through a gap between the bottom portion 25 and the side wall portion 17. As described above, between the outer side surface of the side wall portion 17 of the first hydraulic switch 13 and the inner wall of the storage hole 36 and the outer side surface of the side wall portion 17 of the second hydraulic switch 15 and the inner wall of the storage hole 37. A gap through which oil can flow is provided. For this reason, the space S <b> 1 communicates with the mating surface 30. Further, the other ends of the breathing holes 45A to 45D communicate with the space S2 in which the second electrode 26 is provided. Therefore, the breathing holes 45 </ b> A to 45 </ b> D allow oil to flow through the mating surface 30 and the space S <b> 2. Further, there is a gap between the end portions 23A and 26A of the first hydraulic switch 13 and the second hydraulic switch 15 and the inner walls of the storage holes 36 and 37, and the gap is also formed in the space S2 via the space S1. Communicates.

  As shown in FIGS. 3A and 3B, a groove 46 is formed on the mating surface 30 from the side surface 27 </ b> C toward the breathing hole 45 </ b> A of the first hydraulic switch 13. The groove portion 46 has an inflow port (first opening portion) 46 </ b> A that opens at a position higher than the breathing hole 45 </ b> A on the side surface 27 </ b> C, and is open outside the mating surface 30. An oil reservoir 46B, which is the lower end of the groove 46, is disposed immediately above the breathing hole 45A. Similarly, a groove 49 is formed on the mating surface 30 from the side surface 27C toward the breathing hole 45C of the second hydraulic switch 15. The groove portion 46 has the inlet 46A corresponding to the breathing hole 45A of the first hydraulic switch 13, whereas the groove portion 49 has an inlet corresponding to the breathing hole 45C of the second hydraulic switch 15 on the side surface 27C. (Second opening) 49A. The inflow port 49A is formed so that the opening area of the inflow port 49A is the same as the opening area of the inflow port 46A, and is arranged at a position above the breathing hole 45C and below the inflow port 46A in the vertical direction. Is done. An oil reservoir 49B, which is the lower end of the groove portion 49, is disposed immediately above the breathing hole 45C.

  A groove portion 47 is formed on the mating surface 30 from the side surface 27 </ b> D toward the breathing hole 45 </ b> B of the first hydraulic switch 13. An inlet 47A corresponding to the breathing hole 45B of the first hydraulic switch 13 is disposed on the side surface 27D. The inlet 47A is disposed above the breathing hole 45B in the vertical direction, and the oil reservoir 47B, which is the lower end of the groove 47, is disposed immediately above the breathing hole 45B. Further, the end 23A of the first electrode 23 of the second hydraulic switch 15 is disposed above the breathing hole 45D and closer to the side surface 27D than the side surface 27C. A groove 50 is formed from the second end toward the end 23 </ b> A of the second hydraulic switch 15. Similarly to the groove portion 47, the groove portion 50 has an inflow port 50A that opens at the side surface 27D, and the inflow port 50A is formed such that the opening area of the inflow port 50A is larger than the opening area of the inflow port 47A. In the vertical direction, the second hydraulic switch 15 is disposed above the end 23A and below the inlet 47A. An oil sump 50 </ b> B that is the lower end of the groove 50 is disposed immediately above the end 23 </ b> A of the second hydraulic switch 15.

  The inlet 46A may be formed so that the opening area of the inlet 46A located above the inlet 49A is smaller than the opening area of the inlet 49A. In this case, since the opening area of the inlet 46A is smaller than the opening area of the inlet 49A located below the inlet 46A, the amount of oil flowing into the inlets 46A and 49A is the same as the opening area of the inlet 46A. It is made more uniform than when the opening area of the inflow port 49A is the same. Further, the inflow port 50A may be formed so that the opening area of the inflow port 50A is the same as the opening area of the inflow port 47A.

  The mating surface 30 has a lightening portion 51 that is thinned above the groove portions 46 and 47 so that the upper portions of the two groove portions 46 and 47 are connected. The lightening portion 51 is formed leaving the side surfaces 27A, 27C, 27D of the housing main body 27, the storage hole 36 with which the first hydraulic switch 13 is in contact, and the cylinder portion 41 at the upper end. Similarly, the mating surface 30 has a thinned portion 52 that is thinned above the groove portions 49 and 50 so that the upper portions of the two groove portions 49 and 50 are also connected. The lightening portion 52 is formed leaving the side surfaces 27C and 27D of the housing body 27, the storage holes 36 and 37 with which the first hydraulic switch 13 and the second hydraulic switch 15 are in contact, and the middle cylindrical portion 42. ing.

  Since the present embodiment is configured as described above, the oil flowing from above through the surface of the hydraulic switch unit 12 flows from the respective inlets 46A, 47A, 49A, 50A from the grooves 46, 47, 49. , 50. The oil flowing into the grooves 46, 47, 49, 50 flows along the grooves 46, 47, 49, 50 toward the breathing holes 45 A, 45 B, 45 C and the end 23 A of the second hydraulic switch 15. The oil that has flowed accumulates in the oil reservoirs 46B, 47B, 49B, and 50B of the groove portions 46, 47, 49, and 50. Since the open ends 41A, 42A, 43A protrude from the mating surface 30 toward the mounting surface 10, there is a gap between the mating surface 30 and the mounting surface 10, and the accumulated oil passes through the gap. The oil that has passed through the gap is a gap between the outer side surface of the first hydraulic switch 13 side wall portion 17 and the storage hole 36, a gap between the outer side surface of the side wall portion 17 and the storage hole 37, and the second hydraulic switch 15. It flows to the end 23A. The oil that has flowed through the gap between the outer side surface of the first hydraulic switch 13 side wall 17 and the storage hole 36 and the gap between the outer side surface of the second hydraulic switch 15 side wall 17 and the storage hole 37 enters the space S1. Inflow. Since the side wall portion 17 and the bottom portion 25 are not in close contact with each other, the oil flows into the breathing holes 45A, 45B, and 45C. The oil reservoirs 46B, 47B, 49B, 50B are disposed immediately above the breathing holes 45A, 45B, 45C and the end 23A of the second hydraulic switch 15. For this reason, the oil is prevented from flowing toward the portions other than the breathing holes 45A, 45B, 45C and the end portion 23A of the second hydraulic switch 15, and the oil is efficiently supplied to the breathing holes 45A, 45B, 45C, and the second hydraulic switch 15. To the end 23A of the hydraulic switch 15.

  The oil that has flowed into the breathing holes 45A, 45B, 45C passes through the breathing holes 45A, 45B, 45C and flows into the space S2. The oil that flows toward the end portion 23A of the second hydraulic switch 15 flows into a gap sandwiched between the end portion 23A of the second hydraulic switch 15 and the pressing portion 29, and the side wall portion 17 and the bottom portion 25 from the gap. And flows into the space S2. For this reason, even if the hydraulic switch unit 12 is disposed on the side of the valve body 6 and the first hydraulic switch 13 and the second hydraulic switch 15 are not immersed in oil, the temperature of the oil in the space S2 is increased. Evaporation due to high temperature is prevented. Since the oil is prevented from evaporating, the insulating material is prevented from sticking to the conductive plate 21, the first electrode 23, and the second electrode 26, and the occurrence of poor conduction is prevented.

The present embodiment includes at least the following configuration. The hydraulic switch unit (12) according to the present embodiment (see FIGS. 2 and 4) includes a hydraulic switch (13) for monitoring the hydraulic pressure in the valve body (6),
A housing (16) provided with a mating surface (30) to be attached to an outer mounting surface (10) of the valve body (6) and into which the hydraulic switch (13) is inserted from the mating surface (30) side; With
The hydraulic switch (13) includes a contact portion (26) that contacts and separates according to the hydraulic pressure,
A communication hole (45A) through which the mating surface (30) communicates with the space (S2) provided with the contact portion (26) and flows oil;
The mating surface (30) has an opening (46A) that opens to the outside of the housing (16) other than the mating surface (30), and extends from the opening (46A) to the communication hole (45A). The groove portion (46) is formed.

  As a result, the oil easily flows into the breathing hole 45A and enters the space S2 where the second electrode 26 is provided through the breathing hole 45A. For this reason, even when the first hydraulic switch 13 is not immersed in oil, the oil flows into the space S2, so that heat generation of the oil and evaporation due to the heat generation are reduced. In addition, solid matter or the like in the oil is difficult to adhere to the second electrode 26.

  Further, in the hydraulic switch unit (12) according to the present embodiment (see FIGS. 2 and 4), the opening (46A) is connected in the vertical direction in a state where it is attached to the valve body (6). It arrange | positions above a hole (45A).

  Thereby, the oil is guided toward the breathing hole 45A by the groove 46, and the oil flows into the space S2 more efficiently.

In the hydraulic switch unit (12) according to the present embodiment (see FIG. 4), the hydraulic switch (13) is a first hydraulic switch,
The opening (46A) is a first opening,
A second hydraulic switch (15) disposed below the first hydraulic switch (13) in the vertical direction;
A second opening (49A) disposed below the first opening (46A) and corresponding to the second hydraulic switch (15),
The opening area of the first opening (46A) is smaller than the opening area of the second opening (49A).

  As a result, the amount of oil flowing into the inlets 46A and 49A is made more uniform than when the opening area of the inlet 46A is the same as the opening area of the inlet 49A.

Further, the automatic transmission (1) according to the present embodiment (see FIGS. 1, 2 and 4), a valve body (6),
A hydraulic switch (13) for monitoring the hydraulic pressure in the valve body (6) and a mating surface (30) for attaching to an outer mounting surface (10) of the valve body are provided, and the mating surface (30) A hydraulic switch unit (12) having a housing (16) into which the hydraulic switch (13) is inserted from the side thereof,
The hydraulic switch (13) includes a contact portion (26) that contacts and separates according to the hydraulic pressure,
A communication hole (45A) through which the mating surface (30) communicates with the space (S2) provided with the contact portion (26) and flows oil;
At least one of the mounting surface (10) and the mating surface (30) has an opening (46A) that opens to the outside other than the mounting surface (10) and the mating surface (30). A groove (46) formed from (46A) toward the communication hole (45A).

  As a result, the oil easily flows into the breathing hole 45A and enters the space S2 where the second electrode 26 is provided through the breathing hole 45A. For this reason, even when the first hydraulic switch 13 is not immersed in oil, the oil flows into the space S2, so that heat generation of the oil and evaporation due to the heat generation are reduced. In addition, solid matter or the like in the oil is difficult to adhere to the second electrode 26.

  In addition, although the groove part was formed in the mating surface 30, in order to guide oil to the breathing holes 45A, 45B, 45C, 45D or the end parts 23A, 26A, a hydraulic switch in which a hole is drilled from the surface of the housing 16 by a drill or the like. Units are also conceivable.

  In the present embodiment, the inflow ports are arranged on the side surfaces 27C and 27D of the hydraulic switch unit 12. However, the present invention is not limited to this, and the present invention can also be applied to the case where the inflow port is arranged on the side surface 27A of the hydraulic switch unit. It is.

  Moreover, although demonstrated with the automatic transmission 1 for FF vehicles, it is not limited to this. The present technology is applicable not only to the FF vehicle but also to the FR vehicle, that is, any automatic transmission in which the valve body and the hydraulic switch unit are not immersed in oil.

  In the present embodiment, the grooves 46, 47, 49, 50 are provided on the mating surface 30 of the hydraulic switch unit 12, but only the mounting surface 10 of the valve body 6 may have a groove. Moreover, both the attachment surface 10 and the mating surface 10 may have a groove part. That is, it is sufficient that at least one of the mounting surface 10 of the valve body 6 and the mating surface 30 of the hydraulic switch unit 12 has a groove.

1 Automatic transmission 6 Valve body 10 Mounting surface 12 Hydraulic switch unit 13 First hydraulic switch (hydraulic switch)
15 Second hydraulic switch 16 Housing 26 Contact part (second electrode)
30 Mating surface 45A Communication hole (breathing hole)
46 groove part 46A 1st opening part (opening part, inflow port)
49A Second opening (inlet)
S2 space

Claims (4)

A hydraulic switch for monitoring the hydraulic pressure in the valve body;
A mating surface to be attached to an outer mounting surface of the valve body, and a housing into which the hydraulic switch is inserted from the mating surface side,
The hydraulic switch includes a contact portion that contacts and separates according to the hydraulic pressure,
A communication hole through which the mating surface and the space provided with the contact portion communicate with each other to flow in oil;
The mating surface has an opening that opens to the outside of the housing other than the mating surface, and has a groove formed from the opening toward the communication hole.
Hydraulic switch unit. The opening is disposed above the communication hole in the vertical direction in a state of being attached to the valve body.
The hydraulic switch unit according to claim 1. The hydraulic switch is a first hydraulic switch;
The opening is a first opening;
A second hydraulic switch disposed below the first hydraulic switch in the vertical direction;
A second opening disposed below the first opening and corresponding to the second hydraulic switch,
An opening area of the first opening is smaller than an opening area of the second opening;
The hydraulic switch unit according to claim 2. A valve body;
A hydraulic switch that monitors the hydraulic pressure in the valve body; and a housing that is provided with a mating surface that is attached to an outer mounting surface of the valve body and into which the hydraulic switch is inserted from the mating surface side. A hydraulic switch unit,
The hydraulic switch includes a contact portion that contacts and separates according to the hydraulic pressure,
A communication hole through which the mating surface and the space provided with the contact portion communicate with each other to flow in oil;
At least one of the mounting surface and the mating surface has an opening that opens to the outside other than the mounting surface and the mating surface, and has a groove formed from the opening toward the communication hole.
Automatic transmission.

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