JP6799440B2 - transmission - Google Patents

Description

The present invention relates to a transmission.

Patent Document 1 discloses a technique of moving a manual valve with a hydraulic actuator to realize a position according to a range of a transmission.

Japanese Unexamined Patent Publication No. 2004-316682

In order to realize the position according to the range of the transmission, for example, it is conceivable to move the manual valve by adjusting the piston thrusts facing each other with the linear solenoid valve. However, in this case, if a problem occurs in the hydraulic actuator of the linear solenoid valve during traveling, the range may be switched during traveling.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a transmission capable of preventing a range from being switched even if a malfunction occurs in a hydraulic actuator during traveling.

A transmission according to an embodiment of the present invention has a range switching piston that receives pressure in a first pressure receiving chamber and switches the range according to a selected range, a fastening element having a second pressure receiving chamber, and upstream of the first pressure receiving chamber. It has a first hydraulic actuator located, a second hydraulic actuator located upstream of the second pressure receiving chamber, and a spool located upstream of the first hydraulic actuator, and the spool is the second hydraulic actuator. When a pressure receiving surface is provided downstream of the pressure receiving surface and hydraulic pressure acts on the pressure receiving surface, the supply of oil pressure to the first hydraulic actuator is blocked.

According to the above aspect, the fastening element is fastened by supplying hydraulic pressure via the second hydraulic actuator during traveling. On the other hand, according to the above aspect, the flood control is also supplied to the pressure receiving surface of the spool located downstream of the second hydraulic actuator during traveling.

Therefore, according to the above aspect, it is possible to prevent the supply of oil to the first hydraulic actuator during traveling. Therefore, even if a problem occurs in the first hydraulic actuator during traveling, it is possible to prevent the range from being switched.

It is a figure which shows the main part of the transmission in the state which realized the intermediate position. It is a figure which shows the main part of the transmission in the state which realized the 1st position. It is a figure which shows the main part of the transmission in the state which realized the 2nd position. FIG. 1 is a diagram illustrating a position selection device when an abnormality occurs. FIG. 2 is a diagram illustrating a position selection device when an abnormality occurs. It is a figure which shows the modification of a transmission.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 are views showing a main part of the transmission of the present embodiment. The transmission is configured to include a position selection device 100. The position selection device 100 switches the oil flow path according to the selection range of the transmission. The position selection device 100 has a first position, a second position, and an intermediate position between the first position and the second position as positions according to the range of the transmission.

The first position is the position corresponding to the D range, that is, the forward range. The second position is the position corresponding to the R range, that is, the reverse range. The intermediate position is the position corresponding to the N range, that is, the neutral range.

FIG. 1 shows a position selection device 100 in a state where an intermediate position is realized. Further, FIG. 2 shows the position selection device 100 in a state where the first position is realized, and FIG. 3 shows the position selection device 100 in a state where the second position is realized.

The position selection device 100 includes a first piston 1, a second piston 2, a housing 3, a control oil passage 4, a supply oil passage 5, a first SOL6, a second SOL7, a clutch SOL8, and a shutoff valve 10. , A lever 20 is provided. SOL is an abbreviation for solenoid valve.

The first piston 1 and the second piston 2 are housed in the housing 3. The first piston 1 has a substantially cylindrical shape, and the second piston 2 has a cylindrical shape. The first piston 1 includes a piston portion 1a, a valve portion 1b, and a drive portion 1c.

The piston portion 1a constitutes a range switching piston that switches the range of the transmission according to the selected range. It may be understood that the range switching piston is configured to further include a housing 3, specifically, a first accommodating portion 3a and a second accommodating portion 3b, which will be described later. The piston portion 1a is composed of a stepped piston including a small diameter portion and a large diameter portion.

The small diameter portion is slidably inserted into the second piston 2. The small diameter portion has a first pressure receiving surface S1 on one end side. The large diameter portion has a first contact surface E1 on one end side. The first contact surface E1 comes into contact with the second piston 2. The large diameter portion has a second pressure receiving surface S2 on the other end side. The second pressure receiving surface S2 is provided in a ring shape and has a larger area than the first pressure receiving surface S1. The second pressure receiving surface S2 constitutes a surface on the back side with respect to the first contact surface E1 and the first pressure receiving surface S1. It should be noted that "the first predetermined surface (for example, the second pressure receiving surface S2) constitutes a surface on the back side with respect to the second predetermined surface (for example, the first contact surface E1 and the first pressure receiving surface S1)". When a force is applied in the direction of pushing one of the first predetermined surface and the second predetermined surface, the other of the first predetermined surface and the second predetermined surface pulls the other of the first predetermined surface and the second predetermined surface. Means a moving relationship.

The valve portion 1b is connected to the piston portion 1a from the other end side. As will be described later, the valve unit 1b constitutes a range switching valve that switches the range of the transmission according to the selected range. It may be understood that the range switching valve is configured to further include a housing 3, specifically, a third accommodating portion 3d described later.

The drive unit 1c is connected to the valve unit 1b from the other end side. The working portion of the lever 20 is installed in the driving portion 1c. The drive unit 1c is driven by the lever 20, and the lever 20 is driven by the operating force of the driver.

The lever 20 is a backup lever different from the operation lever used by the driver in the range selection operation when the driver is normal, and constitutes the manual switching mechanism M of the piston unit 1a together with the drive unit 1c. The lever 20 may be an operating lever directly operated by the driver, or may be a lever in which the operating force is transmitted from the operating lever directly operated by the driver via an operating force transmitting mechanism such as a link mechanism. ..

The second piston 2 has a third pressure receiving surface S3 on one end side and has an outer diameter larger than that of the large diameter portion of the piston portion 1a. Therefore, the sum of the area of the first pressure receiving surface S1 and the area of the third pressure receiving surface S3 is larger than the area of the second pressure receiving surface S2.

The housing 3 has a pressure receiving chamber R1 and a pressure receiving chamber R2. The first pressure receiving surface S1 and the third pressure receiving surface S3 are located in the pressure receiving chamber R1, and the second pressure receiving surface S2 is located in the pressure receiving chamber R2. In other words, the first pressure receiving surface S1 and the third pressure receiving surface S3 receive pressure in the pressure receiving chamber R1, and the second pressure receiving surface S2 receives pressure in the pressure receiving chamber R2.

The pressure receiving chamber R1 and the pressure receiving chamber R2 constitute a pressure receiving chamber on one side and a pressure receiving chamber on the other side for generating an opposed thrust in the piston portion 1a. Either the pressure receiving chamber R1 or the pressure receiving chamber R2 corresponds to the first pressure receiving chamber.

The housing 3 has a first accommodating portion 3a, a second accommodating portion 3b, a step portion 3c, and a third accommodating portion 3d. The first accommodating portion 3a slidably accommodates the second piston 2, and the second accommodating portion 3b slidably accommodates the large diameter portion of the piston portion 1a.

The first accommodating portion 3a has an inner diameter larger than that of the second accommodating portion 3b, and the step portion 3c connects the first accommodating portion 3a and the second accommodating portion 3b. The second piston 2 comes into contact with the stepped portion 3c, whereby the movement of the second piston 2 is restricted. The step portion 3c constitutes a stopper. The third accommodating portion 3d slidably accommodates the valve portion 1b.

The housing 3 has a first control port portion P1, a second control port portion P2, an inlet port portion P3, a first outlet port portion P4, a second outlet port portion P5, and a drain port portion P6. The first control port portion P1 is provided in the first accommodating portion 3a, and the second control port portion P2 is provided in the second accommodating portion 3b. The other port portions P3 to P6 are provided in the third accommodating portion 3d. Each port portion P1 to P6 is provided in a ring shape.

The first control port unit P1 communicates with the pressure receiving chamber R1, and the second control port unit P2 communicates with the pressure receiving chamber R2. The inlet port portion P3 communicates with the first exit port portion P4 or the second exit port portion P5 via an internal passage.

The first exit port portion P4 communicates with the inlet port portion P3 in a state where the intermediate position shown in FIG. 1 is realized. A forward clutch FWD / C is connected to the first outlet port portion P4.

The second exit port portion P5 communicates with the inlet port portion P3 in a state where the first position shown in FIG. 2 is realized. The reverse brake REV / B is connected to the second exit port portion P5. The second outlet port portion P5 communicates with the drain port portion P6 in a state where the second position shown in FIG. 3 is realized.

The control oil passage 4 is connected to the first control port unit P1 and the second control port unit P2. Therefore, a common oil pressure is supplied to the pressure receiving chamber R1 and the pressure receiving chamber R2 from the control oil passage 4. Specifically, the control oil passage 4 is configured to have a first branch oil passage 4a and a second branch oil passage 4b that branch and connect to the first control port portion P1 and the second control port portion P2.

The supply oil passage 5 is connected to the inlet port portion P3. The supply oil passage 5 constitutes an oil passage for supplying oil to the forward clutch FWD / C and the reverse brake REV / B. The supply oil passage 5 supplies oil to the forward clutch FWD / C in a state where the first position shown in FIG. 2 is realized. Further, the supply oil passage 5 supplies oil to the reverse brake REV / B in a state where the second position shown in FIG. 3 is realized. Either the forward clutch FWD / C or the reverse brake REV / B constitutes a fastening element having a second pressure receiving chamber.

A clutch SOL 8 is provided in the supply oil passage 5. The supply oil passage 5 has a branch oil passage 5a that branches from a portion of the supply oil passage 5 downstream of the clutch SOL8.

SOL6 and SOL7 are provided in the control oil passage 4. Specifically, the SOL 6 is provided in the first branch oil passage 4a, and the SOL 7 is provided in the second branch oil passage 4b. Therefore, the pressure receiving chamber R1 is supplied with oil from the control oil passage 4 via the SOL6, and the pressure receiving chamber R2 is supplied with the oil pressure from the control oil passage 4 via the SOL7.

Both SOL6 and SOL7 communicate with and shut off the control oil passage 4. When the control oil passage 4 is shut off, the SOL 6 communicates with the pressure receiving chamber R1 and the drain port, and the SOL 7 communicates with the pressure receiving chamber R2 and the drain port. Both SOL6 and SOL7 form a hydraulic actuator. The hydraulic actuator is an actuator for hydraulic control, and the SOL 6 and SOL 7 specifically control the downstream hydraulic pressure by supplying and draining oil. Either SOL6 or SOL7 corresponds to the first hydraulic actuator.

The clutch SOL8 is provided in the supply oil passage 5 and adjusts the supply hydraulic pressure to the forward clutch FWD / C and the reverse brake REV / B. The clutch SOL8 communicates with the downstream of the clutch SOL8 and the drain port in the closed state. The clutch SOL8 constitutes a second hydraulic actuator located upstream of the forward clutch FWD / C and the reverse brake REV / B.

The shutoff valve 10 is provided in the control oil passage 4. Specifically, the shutoff valve 10 is provided upstream of the first branch oil passage 4a and the second branch oil passage 4b. The shutoff valve 10 has a spool 11, a housing 12, and a spring 13.

The spool 11 is provided in the housing 12 and switches between communication and interruption of the control oil passage 4. The spool 11 has a pressure receiving surface 11a on the other end side. The spool 11 is located upstream of the first pressure receiving chamber composed of either the pressure receiving chamber R1 or the pressure receiving chamber R2.

The housing 12 slidably accommodates the spool 11. The housing 12 has an inlet port portion P11 and an outlet port portion P12. The housing 12 is provided so as to intervene in the control oil passage 4, and the control oil passage 4 is connected via the inlet port portion P11 and the outlet port portion P12.

The housing 12 further includes a drain port portion P13 and a pilot port portion P14. The drain port portion P13 communicates with the outlet port portion P12 via the internal passage when the spool 11 blocks the control oil passage 4. A branch oil passage 5a is connected to the pilot port portion P14. Therefore, the spool 11 has a pressure receiving surface 11a downstream of the clutch SOL8.

The flood pressure supplied to the pilot port portion P14 acts on the pressure receiving surface 11a of the spool 11. When the flood pressure acts on the pressure receiving surface 11a, a thrust for moving the spool 11 in the direction of shutting off the control oil passage 4 is generated.

The spring 13 is provided at one end in the housing 12. The spring 13 urges the spool 11 in the direction of communicating with the control oil passage 4.

The position selection device 100 is controlled by the controller 30. The controller 30 is a transmission controller, and controls SOL6 and SOL7 in response to a driver's range selection operation using an operation lever used in a normal state.

When the N range is selected, the controller 30 closes the clutch SOL8. As a result, oil is drained from the downstream side of the clutch SOL8 through the drain port of the clutch SOL8. As a result, the spool 11 is moved by the urging force of the spring 13, and the control oil passage 4 is communicated with the spool 11.

The controller 30 further controls SOL6 and SOL7 so as to communicate with the control oil passage 4. As a result, the intermediate position shown in FIG. 1 is realized.

When the D range is selected from the N range, the controller 30 controls the SOL 6 so as to communicate with the control oil passage 4, and controls the SOL 7 so as to shut off the control oil passage 4. As a result, the first position shown in FIG. 2 is selected.

After the first position is selected, the controller 30 further opens the clutch SOL8. As a result, flood control is supplied to the forward clutch FWD / C, and the range of the transmission becomes the D range. Further, the control oil passage 4 is shut off by the flood control acting on the pressure receiving surface 11a of the spool 11.

When the R range is selected from the N range, the controller 30 controls the SOL 6 so as to shut off the control oil passage 4, and also controls the SOL 7 so as to communicate with the control oil passage 4. As a result, the second position shown in FIG. 3 is selected. After the second position is selected, the clutch SOL8 is opened as in the case of the D range. As a result, the range of the transmission becomes the R range, and the control oil passage 4 is cut off.

When the D range is selected, the controller 30 can be configured to first realize the intermediate position and then the first position. The same applies to the R range. The controller 30 can be configured to achieve an intermediate position even when the P range, or parking range, is selected.

The controller 30 further maintains the clutch SOL8 in the valve open state when an abnormality of SOL6 or SOL7 occurs. The abnormality of SOL6 or SOL7 is, for example, an open failure in which the valve remains open or a closed failure in which the valve remains closed. The abnormality of SOL6 or SOL7 may be detected by an appropriate technique in addition to the known technique.

4A and 4B are explanatory views of the position selection device 100 when an abnormality occurs. 4A and 4B show a case where the D range is manually selected from the N range when an abnormality occurs. 4A and 4B show a case where an open failure occurs in SOL7.

As shown in FIG. 4A, even in the N range, when the clutch SOL 8 is maintained in the valve open state, the hydraulic pressure is supplied downstream of the clutch SOL 8 and the hydraulic pressure acts on the pressure receiving surface 11a of the spool 11. As a result, the control oil passage 4 is shut off, and the pressure receiving chamber R1 and the pressure receiving chamber R2 are not supplied with the oil pressure.

Further, in this case, the valve-opened SOL6 and SOL7 communicate with the pressure receiving chamber R1 and the pressure receiving chamber R2 and the drain port portion P13. Therefore, the pressure receiving chamber R1 and the pressure receiving chamber R2 are in a state where oil can be drained through the drain port portion P13.

As a result, it is prevented that the operating force for driving the piston portion 1a via the manual switching mechanism M becomes large due to the influence of the hydraulic pressure of the pressure receiving chamber R1 and the pressure receiving chamber R2. As a result, the D range can be easily selected as shown in FIG. 4B by driving the first piston 1 by manual operation via the manual switching mechanism M. This also applies to range selection other than the case of selecting the D range from the N range.

Next, the main functions and effects of the transmission according to the present embodiment will be described.

The transmission includes a piston portion 1a that receives pressure in the pressure receiving chamber R1 and the pressure receiving chamber R2, a forward clutch FWD / C, a reverse brake REV / B, and SOL6 and SOL7 located upstream of the pressure receiving chamber R1 and the pressure receiving chamber R2. It has a clutch FWD / C, a clutch SOL8 located upstream of the reverse brake REV / B, and a spool 11 located upstream of the SOL6 and SOL7. The spool 11 has a pressure receiving surface 11a downstream of the clutch SOL8. In the transmission, when the flood control acts on the pressure receiving surface 11a, the supply of the flood control to the SOL 6 and SOL 7 is blocked.

According to such a configuration, the forward clutch FWD / C and the reverse brake REV / B are engaged by supplying the electric pressure through the clutch SOL8 during traveling. On the other hand, according to such a configuration, the flood pressure is also supplied to the pressure receiving surface 11a of the spool 11 located downstream of the clutch SOL 8 during traveling.

Therefore, according to such a configuration, it is possible to prevent the oil supply to the SOL 6 and the SOL 7 during traveling. Therefore, even if an abnormality occurs in SOL6 and SOL7 during traveling, it is possible to prevent the range from being switched (effect corresponding to claim 1).

The transmission has a manual switching mechanism M for the piston portion 1a. When the transmission detects an abnormality in SOL6 and SOL7, flood control is supplied downstream of the clutch SOL8.

According to such a configuration, by maintaining the state of supplying the hydraulic pressure downstream of the clutch SOL8, it is possible to remove the factor that hinders the operation via the manual switching mechanism M. Therefore, it is possible to prevent the operation via the manual switching mechanism M from being hindered by such a factor (effect corresponding to claim 2).

The transmission has a valve portion 1b that moves together with the piston portion 1a. In the transmission, the forward clutch FWD / C and the reverse brake REV / B are connected to the clutch SOL8 via the valve portion 1b.

When the transmission has such a configuration, it is possible to prevent the range from being switched even if a problem occurs in SOL6 and SOL7 during traveling (effect corresponding to claim 3).

The transmission may be configured as follows.

FIG. 5 is a diagram showing a modified example of the transmission. In this example, the park module 200 is attached to the drive unit 1c of the position selection device 100, and the position selection device 100 operates the park module 200. The park module 200 is a park lock device that parks the vehicle, and parks and releases the park lock as follows.

That is, when the range of the transmission is the P range, the park module 200 performs park clock by locking the output shaft OS of the transmission so as not to rotate. Further, when a range other than the P range is selected from the P range, the park module 200 releases the park lock by unlocking the output shaft OS.

In this example, in the position selection device 100, the second position is a position corresponding to the P range. Further, the intermediate position is a position corresponding to the R range, and the first position is a position corresponding to the N range and the D range.

Therefore, when the second position is realized, the park module 200 is put into the park lock engaged state and is configured to perform park lock. Further, the park module 200 is configured to be in the park lock release state when the intermediate position and the first position are realized.

When the range of the transmission is changed between two ranges of the P range, the R range, and the N range, the position selection device 100 achieves a state corresponding to the selection range through a preliminary state. In the prior state, the first SOL6 and the second SOL7 communicate with the control oil passage 4, and the clutch SOL8 shuts off the supply oil passage 5.

As a result, the intermediate position is realized, and the hydraulic pressure is supplied to the pressure receiving chamber R1 and the pressure receiving chamber R2. When the range of the transmission is changed between the N range and the D range, the state corresponding to the selected range is achieved without going through the pre-state.

When the P range is selected, the first SOL 6 shuts off the control oil passage 4, and the second SOL 7 communicates with the control oil passage 4. The clutch SOL8 shuts off the supply oil passage 5. As a result, oil is supplied to the pressure receiving chamber R2, and the second position is realized. As a result, the park module 200 is put into the park lock engaged state. As shown in this example, the control oil passage 4 can be connected to a portion of the supply oil passage 5 upstream of the clutch SOL 8 upstream of the shutoff valve 10.

When the R range is selected, the first SOL6 and the second SOL7 communicate with the control oil passage 4, and the clutch SOL8 communicates with the supply oil passage 5. As a result, oil is supplied to the reverse brake REV / B while maintaining the intermediate position realized in the preliminary state, and the range of the transmission is set to the R range. The park module 200 is in the park lock release state.

When the N range is selected, the first SOL 6 communicates with the control oil passage 4, and the second SOL 7 shuts off the control oil passage 4. The clutch SOL8 shuts off the supply oil passage 5. As a result, oil is supplied to the pressure receiving chamber R1 and the first position is realized. Further, while the first position corresponds to the D range, the clutch SOL8 can drain the oil downstream, so the range of the transmission is set to the N range. The park module 200 is in the park lock release state.

When the D range is selected, the first SOL 6 communicates with the control oil passage 4, and the second SOL 7 shuts off the control oil passage 4. The clutch SOL8 communicates with the supply oil passage 5. As a result, oil is supplied to the forward clutch FWD / C while maintaining the first position realized in the N range, and the range of the transmission is set to the D range. The park module 200 is in the park lock release state.

Even in the transmission in which the position selection device 100 is configured in this way, it is possible to prevent an abnormality from occurring in SOL6 and SOL7 during traveling and switching the range of the transmission.

The transmission in which the position selection device 100 is configured in this way further has a manual switching mechanism M for the piston portion 1a, and when an abnormality in SOL6 or SOL7 is detected, hydraulic pressure is supplied downstream of the clutch SOL8. You may. In this case as well, it is possible to prevent the operation via the manual switching mechanism M from being hindered by removing the factor that hinders the operation via the manual switching mechanism M as described above.

Although the embodiments of the present invention have been described above, the above embodiments are only a part of the application examples of the present invention, and the technical scope of the present invention is limited to the specific configurations of the above embodiments. Absent.

For example, in the transmissions shown in FIGS. 1 to 3, the forward clutch FWD / C and the reverse brake REV / B may be interchanged. In this case, when the R range is selected, the controller 30 may be configured so that the first position shown in FIG. 2 is selected as the position corresponding to the R range. Further, when the D range is selected, the controller 30 may be configured so that the second position shown in FIG. 3 is selected as the position corresponding to the D range.

The hydraulic actuator may be a linear SOL having a solenoid portion that generates a pilot pressure and a valve portion that operates in response to the pilot pressure generated by the solenoid portion. In this case, it can be understood that the valve portion of the linear SOL is a hydraulic actuator that controls the flood control and constitutes a hydraulic actuator that is driven by the flood control.

1 1st piston 1a Piston part (range switching piston)
1b Valve part (range switching valve)
2 2nd piston 3 Housing 6 SOL (1st hydraulic actuator)
7 SOL (1st hydraulic actuator)
8 Clutch SOL (2nd hydraulic actuator)
11 Spool 11a Pressure receiving surface 100 Position selection device R1 Pressure receiving chamber (first pressure receiving chamber)
R2 pressure receiving chamber (first pressure receiving chamber)
FWD / C forward clutch (fastening element)
REV / B reverse brake (fastening element)
M manual switching mechanism

Claims (3)

A range switching piston that receives pressure in the first pressure receiving chamber and switches the range according to the selected range ,
With a fastening element having a second pressure receiving chamber,
The first hydraulic actuator located upstream of the first pressure receiving chamber and
The second hydraulic actuator located upstream of the second pressure receiving chamber and
A spool located upstream of the first hydraulic actuator and
Have,
The spool has a pressure receiving surface downstream of the second hydraulic actuator.
When hydraulic pressure acts on the pressure receiving surface, the supply of hydraulic pressure to the first hydraulic actuator is blocked.
A transmission characterized by that. The transmission according to claim 1.
It has a manual switching mechanism for the range switching piston.
When an abnormality of the first hydraulic actuator is detected, flood control is supplied downstream of the second hydraulic actuator.
A transmission characterized by that. The transmission according to claim 1 or 2.
It has a range switching valve that moves together with the range switching piston.
The second pressure receiving chamber is connected to the second hydraulic actuator via the range switching valve.
A transmission characterized by that.

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