JP7043140B2 - Lubrication structure of Inhibita switch for automatic transmission - Google Patents

Description

The present invention relates to a lubrication structure for an inhibitor switch for an automatic transmission.

In Patent Document 1, a manual valve is vertically stacked on an inhibitor switch at a position higher than the oil level of the lubricating oil stored in the transmission casing, and under the drain opening of the manual valve. The layout structure of the Inhibita Switch system that lubricates the contacts of the Inhibita Switch by attaching the Inhibita Switch and introducing oil from the drain opening into the inside through the long hole of the cover of the Inhibita Switch is disclosed.

Japanese Patent Application Laid-Open No. 2003-97679

However, in Patent Document 1, since the inhibitor switch and the manual valve are arranged so as to overlap each other in the vertical direction, the degree of freedom in layout is reduced, and the contact portion of the inhibitor switch is lubricated by lowering the drain oil of the manual valve. There is a problem that the lubrication efficiency is poor because it is done by dropping it to the side.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lubrication structure for an inhibitor switch, which secures a degree of freedom in layout and enhances lubrication efficiency.

In the lubrication structure of the inhibitor switch for an automatic transmission, it is placed in the air above the transmission casing, outputs a signal according to the operation position of the select lever, and has a fixed member and a movable member that slides on the fixed member. Depending on the position of the inhibitor switch built in the case and the spool built in the valve body that is placed in the air above the transmission casing and moves in conjunction with the operation of the select lever, the fastening element for forward movement and for reverse movement A manual valve that supplies hydraulic oil for fastening to the fastening element and a manual valve are placed adjacent to the horizontal side of the inhibitor switch, and the drain oil of the valve body of the manual valve is drained to the case of the inhibitor switch. A lubricating oil inlet is provided facing the outlet so that the drain oil discharged from the valve body of the manual valve as the spool of the manual valve moves in the axial direction is introduced into the case of the inhibitor switch.

Therefore, the degree of freedom in layout is ensured and the lubrication efficiency is improved.

It is a schematic diagram which shows the structure of the automatic transmission as an example to which this invention is applied. It is a perspective view seen from the side in the state which the manual valve and the inhibitor switch of Example 1 were assembled. It is a perspective view seen from above with the manual valve of Example 1 and an inhibitor switch assembled. It is sectional drawing which shows the state at the time of shifting from the D range or R range of Example 1 to the N range. It is sectional drawing which shows the state at the time of shifting from the R range to the D range of Example 1. FIG. It is sectional drawing which shows the state at the time of shifting from the D range to the R range of Example 1. FIG.

[Example 1]
FIG. 1 is a schematic view showing a configuration of an automatic transmission as an example to which the present invention is applied.

The automatic transmission of the first embodiment is a belt type continuously variable transmission, but other stepped transmissions may be used and is not particularly limited. The automatic transmission shifts the rotation output from the engine and transmits it to the drive wheels. A torque converter, a forward / backward switching mechanism FRA, a primary pulley PP, a belt VB, a secondary pulley SP, a differential gear DEF, and the like are housed in the transmission casing 20.
Above the transmission casing 20, there is an inhibitor switch 3 interlocked with a select lever operated by a driver (not shown), and a manual shaft 4 that rotates in conjunction with the select lever.

The control valve 1 is located below the transmission casing 20 and is installed in the oil pan 21. Inside the control valve 1, there are a plurality of control valves using an oil pump (not shown) driven by an engine or an electric oil pump as a hydraulic source to regulate various control hydraulic pressures and supply them to a hydraulic actuator.

Above the control valve 1, a hydraulic actuator, a primary pulley PP and a secondary pulley SP, are installed. A forward / backward switching mechanism FRA is installed coaxially with the primary pulley PP. The forward / backward switching mechanism FRA has a planetary gear set and two engagement elements (a forward clutch FWDC that achieves a forward traveling state by engagement and a reverse brake REVB that achieves a reverse traveling state by engagement).
The forward clutch FWDC has a forward clutch pressure chamber 13 that generates a pressing force on a forward clutch piston (not shown).
The reverse brake REVB has a reverse brake pressure chamber 15 that generates a pressing force on a reverse brake piston (not shown).

The manual valve 2 is installed above the primary pulley PP in the transmission casing 20 and adjacent to the transmission casing 20 on the horizontal side of the inhibitor switch 3 via a separate plate (not shown). ing.
The manual valve 2 has a spool 6 for switching the supply destination of the oil regulated by the engagement hydraulic pressure for the start clutch. The spool 6 is connected to the manual shaft 4 via a link member 5, and switches the axial position of the spool 6 according to the rotation of the manual shaft 4 in conjunction with the driver's select lever operation.
Between the control valve 1 and the manual valve 2, there is a first introduction oil passage 11 for supplying oil for engaging the start clutch by a pipe formed in the transmission casing 20.

A second introduction oil passage 12 for supplying oil for engaging the starting clutch is provided between the manual valve 2 and the forward clutch pressure chamber 13. A third introduction oil passage 14 for supplying oil for engaging the start clutch is provided between the manual valve 2 and the reverse brake pressure chamber 15.
The oil level of the transmission casing 20 is set to a height such that a part of the control valve 1 and the lower end of the differential gear DEF come into contact with each other, and the manual valve 2 is higher than the oil level of the transmission casing 20. It is installed in a high air.

FIG. 2 is a side perspective view of the state in which the manual valve and the inhibitor switch of the first embodiment are assembled, and FIG. 3 is a top view of the state in which the manual valve and the inhibitor switch of the first embodiment are assembled. It is a perspective view as seen.
The vertical direction in FIG. 2 is the vertical direction.

The vertically extending manual shaft 4 that rotates in conjunction with the select lever includes a link member 5 that rotates integrally, and the link member 5 engages with the spool 6 of the manual valve 2 to move the spool 6 in the axial direction. However, the traveling range D range (forward traveling), R range (reverse traveling), non-traveling range P range (parking), and N range (neutral) can be switched.
Further, in the manual valve 2, the protruding portion 26 of the manual valve 2 is adjacent to the horizontal side of the inhibitor switch 3 so as to overlap the inhibitor switch 3 in the movable direction of the movable member 31 of the inhibitor switch 3. , Have been placed.
The inhibitor switch 3 is composed of a fixed member 33, a movable member 31, and a case 30.
Further, the bolt 300 is for fixing the manual valve 2 to the transmission casing 20, and the bolt 400 is a manual valve via a spacer 400a for setting a predetermined distance between the manual valve 2 and the inhibitor switch 3. It is a bolt that fastens 2 and the inhibitor switch 3 together.
Therefore, the bolts can be shared and the degree of freedom in layout can be increased.

Although detailed illustration is omitted, the fixing member 33 has a plurality of groove-shaped lanes in which a fixing terminal board is installed inside the fixing member 33.
Further, the movable member 31 has a contactor that slides in contact with the fixed terminal plate installed in the lane constituting the contact portion, and moves in response to the rotation of the manual shaft 4 interlocked with the operation of the select lever of the driver. It is configured to move along the lane in conjunction with the spool 6 of the manual valve 2 to detect a traveling range (D, R range) and a non-traveling range (P, N range).

FIG. 4 is a cross-sectional view showing a state when the D range or the R range of the first embodiment is changed to the N range.

The manual valve 2 is installed on the case 30 side of the inhibitor switch 3 adjacent to the side in the horizontal direction.
The valve body 2a of the manual valve 2 has a cylinder 20a slidably accommodating a spool 6 having three lands 6a, 6b, and 6c, and a suction port 40 to which the fastening hydraulic pressure adjusted by the select solenoid valve 50 is supplied. Discharge port 41 for supplying hydraulic oil to the forward clutch pressure chamber 13 of the forward clutch FWDC, discharge port 42 for supplying hydraulic oil to the reverse brake pressure chamber 15 of the reverse brake REVB, forward clutch pressure chamber of the forward clutch FWDC A drain port 44 as a drain port for draining the oil of 13 and a drain port 43 as a drain port for draining the oil of the reverse brake pressure chamber 15 of the reverse brake REVB are formed.
The inhibitor switch 3 is arranged so that the case 30 is close to the manual valve 2 side and is laterally arranged in the horizontal direction.
The first lubricating oil introduction hole 100 formed in the case 30 is arranged so as to face the opening 44a of the drain port 44 for draining the oil in the forward clutch pressure chamber 13 of the forward clutch FWDC, and is formed in the case 30. The lubricating oil introduction hole 200 is arranged so as to face the opening 43a of the duct-shaped drain port 43 for draining the oil in the reverse brake pressure chamber 15 of the reverse brake REVB formed in the protrusion 26.

FIG. 4 shows a state when the D range or R range of the traveling range is shifted to the N range of the non-traveling range, and the suction port 40 is cut off from the two discharge ports 41 and 42, and the two discharge ports 41. , 42 are in a state of communicating with the drain ports 43 and 44.
Therefore, when shifting from the D range to the N range, the oil in the forward clutch pressure chamber 13 of the forward clutch FWDC is discharged from the drain port 44.
At this time, the drain oil of the fastening hydraulic pressure having a high pressure is ejected and discharged into the first lubricating oil introduction hole 100 arranged to face the opening 44a of the drain port 44, is introduced into the case 30, and is contact-sliding. The contact portion between the fixed member 33 and the movable member 31 can be efficiently lubricated with drain oil without waste.
Further, when shifting from the R range to the N range, the oil in the reverse brake pressure chamber 15 of the reverse brake REVB is drained from the duct-shaped drain port 43.
At this time, the drain oil of the fastening hydraulic pressure having a high pressure is ejected and discharged into the second lubricating oil introduction hole 200 arranged to face the opening 43a of the drain port 43, is introduced into the case 30, and slides. The contact portion between the fixed member 33 and the movable member 31 can be efficiently lubricated with drain oil without waste.

FIG. 5 is a cross-sectional view showing a state when the R range of the first embodiment is changed to the D range.

FIG. 5 shows a state when the range is changed from the R range to the D range, and the suction port 40 is cut off from the discharge port 42 and communicates with the discharge port 41. The discharge port 42 is in a state of communicating with the drain port 43.
Therefore, the oil of the fastening hydraulic pressure adjusted by the select solenoid valve 50 is supplied to the forward clutch pressure chamber 13 of the forward clutch FWDC.
At this time, the drain oil of the fastening hydraulic pressure, which is a high pressure in the reverse brake pressure chamber 15 of the reverse brake REVB, is ejected and discharged into the second lubricating oil introduction hole 200 arranged to face the opening 43a of the drain port 43. The contact portion between the sliding fixing member 33 and the movable member 31, which is introduced inside the case 30, can be efficiently lubricated by drain oil without waste.

FIG. 6 is a cross-sectional view showing a state when the D range of the first embodiment is changed to the R range.

FIG. 6 shows a state when the D range is changed to the R range, and the suction port 40 is cut off from the discharge port 41 and communicates with the discharge port 42. The discharge port 41 is in a state of communicating with the drain port 44.
Therefore, the oil of the fastening hydraulic pressure adjusted by the select solenoid valve 50 is supplied to the reverse brake pressure chamber 15 of the reverse brake REVB.
At this time, the drain oil of the fastening hydraulic pressure, which is a high pressure in the forward clutch pressure chamber 13 of the forward clutch FWDC, is ejected and discharged into the first lubricating oil introduction hole 100 arranged to face the opening 44a of the drain port 44. The contact portion between the sliding fixing member 33 and the movable member 31, which is introduced inside the case 30, can be efficiently lubricated by drain oil without waste.

As described above, in Example 1, the following effects can be obtained.
(1) The case 30 contains a fixing member 33 and a movable member 31 that is arranged in the air above the transmission casing 20 and outputs a signal according to the operation position of the select lever and slides on the fixing member 33. It is a forward fastening element according to the position of the spool 6 built in the valve body 2a, which is arranged in the air above the transmission casing 20 and moves in conjunction with the operation of the select lever. A manual valve 2 for supplying hydraulic oil for fastening to the forward clutch FWDC and the reverse brake REVB which is a reverse fastening element, and a manual valve 2 are arranged adjacent to the lateral side of the inhibitor switch 3 to be arranged. The case 30 of 3 is provided with a first lubricating oil introduction hole 100 and a second lubricating oil introduction hole 200 facing the drain oil drain ports 43 and 44 (drainage ports) of the valve body 2a of the manual valve 2. The drain oil discharged from the valve body 2a of the manual valve 2 as the spool 6 of the valve 2 moves in the axial direction is introduced into the case 30 of the inhibitor switch 3.
Therefore, when switching from the traveling range to the non-traveling range by operating the driver's select lever, or when switching between the D range and the R range, the drain oil is surely ejected from the valve body 2a of the manual valve 2 and discharged. Can be introduced into the case 30 of the inhibitor switch 3, and the contact portion between the sliding fixing member 33 and the movable member 31 can be efficiently lubricated by drain oil without waste.

(2) The first lubricating oil introduction hole 100 provided in the case 30 of the inhibitor switch 3 is directed with respect to the movable direction of the movable member 31 of the inhibitor switch 3 for introducing drain oil from the forward clutch pressure chamber 13 of the forward clutch FWDC. The hole was made to open in the direction orthogonal to each other.
Therefore, with a simple configuration in which the first lubricating oil introduction hole 100, which is a hole, is formed in the case 30, the drain oil ejected from the valve body 2a of the manual valve 2 and discharged is discharged into the case 30 of the inhibitor switch 3. The contact portion between the sliding fixed member 33 and the movable member 31 can be efficiently lubricated by drain oil without waste.

(3) The second lubricating oil introduction hole 200 provided in the case 30 formed in the U shape of the inhibitor switch 3 is a hole that opens in the movable direction of the movable member 31 of the inhibitor switch.
Therefore, the duct-shaped drain port 43 is simply added to the manual valve 2 by utilizing the opening originally provided in the case 30 formed in a U-shape, and the oil is ejected from the valve body 2a of the manual valve 2 by a simple configuration. The drain oil discharged is can be introduced into the case 30 of the inhibitor switch 3, and the contact portion between the sliding fixing member 33 and the movable member 31 is efficiently lubricated by the drain oil without waste. be able to.

(4) The inhibitor switch 3 and the manual valve 2 arranged horizontally adjacent to the transmission casing 20 were fixed by co-tightening the bolts 400.
Therefore, by arranging the inhibitor switch 3 and the manual valve 2 adjacent to each other in the horizontal direction, the fixing bolts can be shared and the degree of freedom in layout can be increased.

[Other Examples]
Although the embodiment for carrying out the present invention has been described above based on the examples, the specific configuration of the present invention is not limited to the configuration shown in the examples and does not deviate from the gist of the invention. Even if there is a design change or the like, it is included in the present invention.

1 Control valve body 2 Manual valve 2a Valve body 3 Inhibita switch 4 Manual shaft 5 Link member 6 Spool 11 1st introduction oil passage 12 2nd introduction oil passage 13 Forward clutch pressure chamber 14 3rd introduction oil passage 15 Reverse brake pressure chamber 20 Transmission casing 30 Case 31 Movable member 33 Fixing member 40 Suction port 41 Discharge port 42 Discharge port 43 Drain port (discharge port)
44 Drain port (drain port)
50 Select solenoid valve 100 1st lubricating oil introduction hole (lubricating oil introduction port)
200 2nd lubricating oil introduction hole (lubricating oil introduction port)
FWDC forward clutch (fastening element for forward)
REVB reverse brake (fastening element for reverse)

Claims (3)

An inhibitor switch that is placed in the air above the transmission casing, outputs a signal according to the operation position of the select lever, and incorporates a fixing member and a movable member that slides on the fixing member in the case.
Hydraulic oil for fastening to the forward fastening element and the reverse fastening element according to the position of the spool built in the valve body that is placed in the air above the transmission casing and moves in conjunction with the operation of the select lever. Supply manual valve and
The manual valve is placed adjacent to the horizontal side of the inhibitor switch.
The case of the inhibitor switch is provided with a lubricating oil introduction port facing the drain oil discharge port of the valve body of the manual valve.
The drain oil discharged from the valve body of the manual valve as the spool of the manual valve moves in the axial direction is introduced into the case of the inhibitor switch.
The lubrication structure of the inhibitor switch for automatic transmissions, which is characterized by this. In the lubrication structure of the inhibitor switch for an automatic transmission according to claim 1.
The lubricating oil inlet provided in the case of the Inhibita Switch is a hole that opens in a direction orthogonal to the movable direction of the movable member of the Inhibita Switch.
The lubrication structure of the inhibitor switch for automatic transmissions, which is characterized by this. In the lubrication structure of the inhibitor switch for an automatic transmission according to claim 1.
The lubricating oil inlet provided in the case of the Inhibita Switch is a hole that opens in the movable direction of the movable member of the Inhibita Switch.
The lubrication structure of the inhibitor switch for automatic transmissions, which is characterized by this.

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