JP2012202534A - Shift-by-wire device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shift-by-wire device including a first actuator shifting a valve body of a manual valve and the second actuator driving a parking lock mechanism, and more appropriately detecting a position of the valve body of the manual valve while making the device compact.SOLUTION: A first shaft 37 connected with the valve body 32 of the manual valve 31 and rotated around a shaft according to a shift of the valve body 32 extends outward from the inside of a transmission case 22. A second shaft 42 connected with the parking lock mechanism 40 and being rotated around the shaft by the second actuator 50 extends outward from the inside of the transmission case 22. A rotation position detecting sensor 70 for detecting a rotation position of the first shaft 37 is disposed outside the transmission case 22. The first shaft 37 is hollowly formed. The second shaft 42 is coaxially inserted in the first shaft 37.

Description

  The present invention relates to a shift-by-wire device including a first actuator that moves a valve body of a manual valve and a second actuator that drives a parking lock mechanism.

  Conventionally, as this type of shift-by-wire device, an apparatus including a first electric actuator for a manual valve that performs range switching and a second electric actuator for a parking lock mechanism has been proposed (for example, Patent Documents). 1). In this shift-by-wire device, by using two types of actuators for a parking lock mechanism and a manual valve, a parking lock mechanism actuator that requires high torque and a manual valve actuator that requires high rotation respectively. A motor that meets the requirements can be used. In this shift-by-wire device, a hollow outer shaft is provided outside the manual shaft for operating the manual valve, and a parking rod arm connected to the parking rod of the parking lock mechanism is coupled to the outer shaft so as to be integrally rotatable. Yes. In addition, as a technology related to this type of shift-by-wire device, a shift position detection device that is configured integrally with a control device that is connected to a manual shaft and detects the position of a manual valve is disposed outside the transmission case. A control device has also been proposed (see, for example, Patent Document 2).

JP 2004-169877 A JP 2009-074698 A

  However, in the shift-by-wire device described in Patent Document 1, the sensor for detecting the position of the manual valve is disposed in the vicinity of the manual shaft. The wiring structure from the sensor to the control device may become complicated. In addition, in order to configure the shift position detection sensor integrally with the control device arranged outside the case as in the control device with shift position detection device described in Patent Document 2, the manual shaft and the shift position detection sensor are connected. Since it is considered that a certain space is required for this, it may be difficult to make the apparatus compact.

  The present invention relates to a shift-by-wire device including a first actuator that moves a valve body of a manual valve and a second actuator that drives a parking lock mechanism, and the position of the valve body of the manual valve while reducing the size of the device. The main purpose is to detect this more appropriately.

  The shift-by-wire device of the present invention employs the following means in order to achieve the main object described above.

The shift-by-wire device of the present invention is
A manual valve that is disposed in the case and forms an oil passage corresponding to a shift position by movement of the valve body; a first actuator that is disposed in the case and moves the valve body of the manual valve; A shift-by-wire device comprising a second actuator that is disposed outside the case and drives a parking lock mechanism, and a control device that controls the first actuator and the second actuator according to the shift position,
A first shaft connected to the valve body of the manual valve and extending from the inside of the case to the outside and rotating about an axis in accordance with the movement of the valve body;
A second shaft coupled to the parking lock mechanism and extending from the inside of the case to the outside and rotated around the axis by the second actuator;
A rotation position detection sensor that is disposed outside the case and detects a rotation position of the first shaft;
One of the first and second shafts is formed hollow, and the other is inserted coaxially into one of the first and second shafts.

  In the shift-by-wire device according to the present invention, the first shaft that is connected to the valve body of the manual valve and rotates around the axis in accordance with the movement of the valve body extends to the outside from the case and is connected to the parking lock mechanism. A second shaft that is driven to rotate about the axis by the second actuator extends from the inside of the case to the outside, and a rotational position detection sensor that detects the rotational position of the first shaft is disposed outside the case. One of the first and second shafts is formed hollow, and the other is inserted coaxially into one of the first and second shafts. As a result, the space for disposing the second shaft extending from the inside of the case to the outside to be connected to both the parking lock mechanism and the second actuator outside the case can be used according to the position of the valve body of the manual valve. Therefore, even if a rotational position detection sensor for detecting the rotational position of the first shaft is disposed outside the case, the apparatus is prevented from becoming complicated and large. It becomes possible. Therefore, according to the shift-by-wire device of the present invention, it is possible to more appropriately detect the position of the valve body of the manual valve while reducing the size of the device.

  The first shaft may be formed hollow, and the second shaft may be coaxially inserted through the first shaft. Accordingly, since the first shaft is disposed on the outer peripheral side of the second shaft, the rotational position of the first shaft can be easily detected by the rotational position detection sensor.

  Further, the rotational position detection sensor may include a rotor having a fitting insertion hole into which the first shaft is fitted, and the inner peripheral surface of the fitting insertion hole may include at least one plane portion. An outer periphery of the first shaft may be formed with at least one flat portion that comes into contact with the flat portion of the fitting insertion hole. Thereby, a 1st shaft and the rotor of a rotation position detection sensor can be easily engaged with a simple structure.

  Moreover, the said control apparatus may be arrange | positioned outside the said case, and the said rotation position detection sensor may be integrated with the said control apparatus. Thereby, it can suppress that the wiring structure between a rotation position detection sensor and a control apparatus becomes complicated. It is also possible to share an existing control device that is integrated with a rotational position detection sensor and that is applied to a transmission that does not employ a shift-by-wire system.

It is a schematic block diagram of the motor vehicle 10 carrying the power transmission device 20 containing the shift-by-wire apparatus 30 which concerns on the Example of this invention. 4 is a partial cross-sectional view showing a main part of the shift-by-wire device 30. 3 is a perspective view showing a main part of the shift-by-wire device 30. FIG. FIG. 3 is an explanatory diagram showing a main part of the shift-by-wire device 30. 4 is a perspective view showing a state in which a rotor 72 of a rotational position detection sensor 70 is inserted into a first shaft 37.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a schematic configuration diagram of an automobile 10 equipped with a power transmission device 20 including a shift-by-wire device 30 according to an embodiment of the present invention. An automobile 10 shown in FIG. 1 includes an engine 12 as a prime mover, which is an internal combustion engine that outputs power by an explosion combustion of a mixture of hydrocarbon fuel such as gasoline and light oil, and air, and an engine electronic that controls the engine 12. A control unit (hereinafter referred to as “engine ECU”) 14, a brake electronic control unit (hereinafter referred to as “brake ECU”) 15 for controlling an electronically controlled hydraulic brake unit (not shown), and a transmission case 22 are arranged. A fluid transmission device (starting device) (not shown), a stepped automatic transmission mechanism 25, a hydraulic control device (not shown) that supplies and discharges hydraulic oil (working fluid) to and from the automatic transmission mechanism 25 according to a shift operation by the driver. Shift-by-wire device 30 for electrically switching the shift position, and electronic control for shifting to control these Knit (hereinafter, "transmission ECU") has a 21 or the like, and a power transmission device 20 for transmitting the power from the engine 12 to the left and right drive wheels DW is connected to a crankshaft (not shown) of the engine 12.

  The engine ECU 14, the brake ECU 15 and the transmission ECU 21 are all configured as a microcomputer centered on a CPU (not shown). In addition to the CPU, a ROM for storing various programs, a RAM for temporarily storing data, and an input / output port And a communication port (both not shown). The engine ECU 14, the brake ECU 15 and the transmission ECU 21 are connected to each other via a bus line or the like, and exchange of data necessary for control is executed between these ECUs as needed.

  The engine ECU 14 has a crankshaft position (not shown) for detecting the accelerator opening degree Acc from the accelerator pedal position sensor 92 for detecting the depression amount (operation amount) of the accelerator pedal 91, the vehicle speed V from the vehicle speed sensor 99, and the rotation of the crankshaft. Signals from various sensors such as sensors, signals from the brake ECU 15 and the shift ECU 21, and the like are input. Based on these signals, the engine ECU 14 installs an electronically controlled throttle valve, a fuel injection valve, a spark plug, etc. (not shown). Control. The brake ECU 15 receives the master cylinder pressure detected by the master cylinder pressure sensor 94 when the brake pedal 93 is depressed, the vehicle speed V from the vehicle speed sensor 99, signals from various sensors (not shown), the engine ECU 14 and the transmission ECU 21. The brake ECU 15 controls a brake actuator (not shown) based on these signals. The shift ECU 21 includes a shift position SP from a shift position sensor 96 that detects an operation position of a shift lever 95 for selecting a desired shift position from among a plurality of shift positions, a vehicle speed V from a vehicle speed sensor 99, not shown. Signals from various sensors and the like, signals from the engine ECU 14 and brake ECU 15 and the like are input, and the transmission ECU 21 controls the fluid transmission device, the automatic transmission mechanism 25, and the like based on these signals.

  FIG. 2 is a partial cross-sectional view showing a main part of the shift-by-wire device 30. The shift-by-wire device 30 has a hydraulic circuit in a hydraulic control device that operates a plurality of brakes and clutches included in the automatic transmission mechanism 25 according to a shift position SP such as a forward position, a neutral position, a reverse position, and a parking position. A first actuator 33 for operating the valve body 32 of the manual valve 31 for driving, and a parking lock mechanism 40 for locking an output shaft (not shown) of the automatic transmission mechanism 25 so as not to rotate when the shift position SP is the parking position. And the above-described transmission ECU 21 that controls the first actuator 33 and the second actuator 50.

  Here, the manual valve 31 is accommodated in a valve body of a hydraulic control device (not shown), and the hydraulic control device is installed in the transmission case 22 so that the manual valve 31 is positioned near the top plate of the transmission case 22. Placed in. The parking lock mechanism 40 includes a parking gear fixed to an output shaft (not shown) of the automatic transmission mechanism 25, and a parking pawl that meshes with the teeth of the parking gear and locks the parking gear in a non-rotatable manner (both not shown). The parking rod 41 having a parking cam (not shown) for pressing the parking pole against the parking gear and releasing the pressing, the second shaft 42 driven to rotate by the second actuator 50, and the rotational motion of the second shaft 42 are parked. The plate member 43 for converting the linear motion of the rod 41, and a roller attached to the tip of the detent spring 45 against the cam surface 43a (see FIGS. 3 and 5) formed on the plate member 43, the plate member 43 in parking lock position Or in which and a detent mechanism 44 to rest in the unlocked position. Further, as shown in FIG. 2, the transmission ECU 21 is housed inside the housing case 80 and disposed outside the transmission case 22.

  The first actuator 33 has a well-known configuration as an actuator of the manual valve 31, and converts the rotation amount of the output shaft 33a, the motor, and the rotor of the motor into an axial movement amount and transmits it to the output shaft 33a. And a gear mechanism (not shown). The first actuator 33 is disposed in the vicinity of the manual valve 31 and in the vicinity of the top plate of the transmission case 22, and is controlled by the transmission ECU 21. However, the first actuator 33 may be configured as a direct acting actuator.

  The valve body 32 of the manual valve 31 is connected to the output shaft 33 a of the first actuator 33 via the operation member 34. One end of a parallel member 35 extending in the axial direction of the valve body 32 of the manual valve 31 is rotatably connected to the shaft portion 34a extending vertically from the operating member 34. The other end of the parallel member 35 is connected to the other end of the figure. The plate member 36 shown in FIG. 3 is rotatably connected through the connecting hole 36a. A hollow first shaft 37 extends vertically from the plate member 36 toward the outside of the transmission case 22. As a result, the first shaft 37 can rotate around the axis as the valve body 32 of the manual valve 31 moves in the axial direction by the power from the first actuator 33 by the action of the operating member 34 and the parallel member 35. It becomes.

  Further, the first shaft 37 is fitted into the rotor 72 of the rotational position detection sensor 70 integrated with the transmission ECU 21. The rotational position detection sensor 70 is configured as a well-known IC built-in rotational position position sensor that detects the rotational position of the rotor 72 and outputs the detected rotational position to the transmission ECU 21, and is integrated with the transmission ECU 21 as shown in FIG. At the same time, it is stored in a storage case 80 disposed on the top surface of the top plate of the transmission case 22. As shown in FIG. 4, the rotor 72 of the rotational position detection sensor 70 has a fitting insertion hole 72 a in which two flat portions 720 facing each other are formed on the inner peripheral surface. As shown in FIGS. 3 and 4, two flat portions 370 that can come into contact with the flat portion 720 of the fitting insertion hole 72 a of the rotor 72 are formed on the outer periphery of the first shaft 37. The shaft 37 is fitted and inserted into the rotor 72 of the rotational position detection sensor 70 so that the flat portion 370 and the flat portion 720 of the fitting insertion hole 72a of the rotor 72 come into contact with each other. FIG. 5 is a perspective view showing a state in which the rotor 72 of the rotational position detection sensor 70 is fitted on the first shaft 37. By adopting such a structure, the first shaft 37 and the rotor 72 of the rotational position detection sensor 70 can be easily engaged.

  And the 2nd shaft 42 rotationally driven by the 2nd actuator 50 which drives the parking lock mechanism 40 is coaxially and rotatably penetrated in the hollow part of the 1st shaft 37, as shown in FIG.2 and FIG.3. At the same time, it extends from the transmission case 22 to the outside and is rotatably connected to one end of the rotating member 51. The other end of the rotating member 51 is connected to the second actuator 50, and is configured to be rotatable around the axis of the second shaft 42 by the power from the second actuator 50. The second actuator 50 has a known configuration as an actuator of the parking lock mechanism 40, and is configured as, for example, a direct acting actuator. As a result, the second shaft 42 can rotate around the axis by the power from the second actuator 50 via the rotating member 51. A seal member (not shown) and a bearing (not shown) for suppressing oil leakage from the inside of the transmission case 22 are disposed between the first shaft 37 and the second shaft 42.

  Next, the operation of the shift-by-wire device 30 configured as described above will be described. In the automobile 10 of the embodiment, when the shift lever 95 is operated by the driver and the shift position SP is set to a shift position other than the parking lock position, the speed change ECU 21 causes the valve body 32 of the manual valve 31 to move. The first actuator 33 is operated. Accordingly, the plate member 36 and the first shaft 37 are rotated by the action of the operating member 34 and the parallel member 35 as the valve body 32 of the manual valve 31 is moved, and the rotational position detection sensor 70 rotates the rotational position of the first shaft 37. Is detected. The transmission ECU 21 stops the operation of the first actuator 33 when determining that the valve body 32 has moved to a position corresponding to the shift position SP based on the rotational position of the first shaft 37 from the rotational position detection sensor 70.

  When the shift position SP is set to the parking position by the driver, the second actuator 50 is controlled by the speed change ECU 21, the second shaft 42 rotates through the rotating member 51, and is fixed to the second shaft 42. As the plate member 43 rotates, the parking rod 41 is pushed toward the parking gear. Accordingly, the parking pole and the parking gear mesh with each other, and the parking lock mechanism 40 is maintained in the parking lock state in which the parking pole and the parking gear mesh with each other by the function of the detent mechanism 44. When the shift position SP is set to a position other than the parking position, the second ECU 50 is controlled by the transmission ECU 21 so that the parking rod 41 is separated from the parking gear by the rotation of the plate member 43 fixed to the second shaft 42. Evacuated. As a result, the engagement between the parking pole and the parking gear is released, and the parking lock mechanism 40 is maintained in the parking lock released state by the function of the detent mechanism 44.

  In the shift-by-wire device 30 of the embodiment described above, the first shaft 37 that is connected to the valve body 32 of the manual valve 31 and rotates about the axis in accordance with the movement of the valve body 32 extends from the inside of the transmission case 22 to the outside. The second shaft 42 that is pulled out and connected to the parking lock mechanism 40 and rotated around the axis by the second actuator 50 extends from the transmission case 22 to the outside, and further detects the rotational position of the first shaft 37. A rotational position detection sensor 70 is disposed outside the transmission case 22. The first shaft 37 is formed hollow, and the second shaft 42 is coaxially inserted into the first shaft 37. Thus, the manual valve is used by utilizing the space for arranging the second shaft 42 extending from the inside of the transmission case 22 to be connected to both the parking lock mechanism 40 and the second actuator 50 outside the transmission case 22. Since the first shaft 37 that rotates around the axis can be arranged according to the position of the valve body 32 of the 31, the rotational position detection sensor 70 that detects the rotational position of the first shaft 37 is arranged outside the transmission case 22. Even so, it is possible to suppress the complexity and size of the apparatus. Therefore, according to the shift-by-wire device 30 of the embodiment, it is possible to more appropriately detect the position of the valve body 32 of the manual valve 31 while reducing the size of the device. Moreover, since the first shaft 37 is disposed on the outer peripheral side of the second shaft 42 by inserting the second shaft 42 into the hollow first shaft 37, the rotational position detection sensor 70 allows the first shaft 37 to be The rotational position can be easily detected.

  Further, in the above-described embodiment, the rotational position detection sensor 70 includes the rotor 72 having the fitting insertion hole 72a into which the first shaft 37 is fitted, and the inner peripheral surface of the fitting insertion hole 72a includes two flat portions 720. Thus, two flat portions 370 that contact the flat portion 720 of the fitting hole 72a are formed on the outer periphery of the first shaft 37. Thereby, the 1st shaft 37 and the rotor 72 of the rotational position detection sensor 70 can be easily engaged with a simple structure. However, as long as the flat part 720 of the insertion hole 72a of the rotor 72 and the flat part 370 on the outer periphery of the first shaft 37 are in contact with each other, one each may be formed, and three or more are formed respectively. May be.

  In the above embodiment, the transmission ECU 21 is disposed outside the transmission case 22, and the rotational position detection sensor 70 is integrated with the transmission ECU 21. Thereby, it can suppress that a wiring structure becomes complicated between the rotational position detection sensor 70 and transmission ECU21. In addition, it is possible to share an existing transmission ECU that is integrated with the rotational position detection sensor 70 and that is applied to a transmission that does not employ a shift-by-wire system. However, the speed change ECU 21 may be disposed inside the transmission case 22, and the rotational position detection sensor 70 may be disposed outside the transmission case 22, and the speed change ECU 21 and the rotational position detection sensor 70 may be connected via wiring. .

  In the present embodiment, the first shaft 37 is formed hollow and the second shaft 42 is coaxially inserted into the first shaft 37. However, the second shaft 42 is formed hollow and the second shaft 42 is formed hollow. The first shaft 37 may be coaxially inserted into the shaft 42. At this time, by forming a notch on the outer periphery of the second shaft 42 disposed on the outer side, and forming an extending portion from the first shaft 37 disposed on the inner side to the notch of the second shaft 42, The extending portion can be engaged with the fitting insertion hole 72 a of the rotor 72 of the rotational position detection sensor 70. Further, the shift ECU 21 is divided into a shift-by-wire ECU that controls the shift-by-wire device 30 (the first actuator 33 and the second actuator 50) and an ECU that controls the hydraulic control device, and the rotational position detection sensor is integrated with the shift-by-wire ECU. You may make it.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the manual valve 31 that is arranged in the transmission case 22 and forms an oil passage corresponding to the shift position SP by the movement of the valve body 32 corresponds to a “manual valve” and is arranged in the transmission case 22. The first actuator 33 that moves the valve body 32 of the manual valve 31 corresponds to the “first actuator”, and the second actuator 50 that is disposed outside the transmission case 22 and drives the parking lock mechanism 40 is the “second actuator”. The transmission ECU 21 that controls the first actuator 33 and the second actuator 50 in accordance with the shift position SP corresponds to a “control device” and is connected to the valve body 32 of the manual valve 31 and the transmission case 22. From within The first shaft 37 that extends around the shaft and rotates about the axis in accordance with the movement of the valve body 32 corresponds to a “first shaft”, is connected to the parking lock mechanism 40 and extends from the transmission case 22 to the outside. The second shaft 42 that is taken out and rotated around the axis by the second actuator 50 corresponds to a “second shaft”, and is disposed outside the transmission case 22 and detects the rotational position of the first shaft 37. The detection sensor 70 corresponds to a “rotational position detection sensor”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problem should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problem. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention is applicable to the shift-by-wire device manufacturing industry.

  10 automobiles, 12 engines, 14 engine ECUs, 15 brake ECUs, 20 power transmission devices, 21 transmission ECUs, 22 transmission cases, 25 automatic transmission mechanisms, 30 shift-by-wire devices, 31 manual valves, 32 valve bodies, 33 first actuators, 33a Output shaft, 34 Actuating member, 34a Shaft, 35 Parallel member, 36 Plate member, 36a Connection hole, 37 First shaft, 370 Plane portion, 40 Parking lock mechanism, 41 Parking rod, 42 Second shaft, 43 Plate member 43a, cam surface, 44 detent mechanism, 45 detent spring, 50 second actuator, 51 parallel member, 70 rotational position detection sensor, 72 rotor, 72a fitting insertion hole, 720 plane portion, 80 storage case, 91 access Pedal, 92 accelerator pedal position sensor, 93 brake pedal, 94 master cylinder pressure sensor, 95 shift lever, 96 shift position sensor, 99 vehicle speed sensor, DW drive wheel.

Claims (4)

A manual valve that is disposed in the case and forms an oil passage corresponding to a shift position by movement of the valve body; a first actuator that is disposed in the case and moves the valve body of the manual valve; A shift-by-wire device comprising a second actuator that is disposed outside the case and drives a parking lock mechanism, and a control device that controls the first actuator and the second actuator according to the shift position,
A first shaft connected to the valve body of the manual valve and extending from the inside of the case to the outside and rotating about an axis in accordance with the movement of the valve body;
A second shaft coupled to the parking lock mechanism and extending from the inside of the case to the outside and rotated around the axis by the second actuator;
A rotation position detection sensor that is disposed outside the case and detects a rotation position of the first shaft;
One of the first and second shafts is formed hollow, and the other is inserted coaxially into one of the first and second shafts. The shift-by-wire device according to claim 1,
The shift-by-wire device, wherein the first shaft is formed hollow, and the second shaft is coaxially inserted into the first shaft. The shift-by-wire device according to claim 2,
The rotational position detection sensor includes a rotor having an insertion hole into which the first shaft is inserted, and an inner peripheral surface of the insertion insertion hole includes at least one plane portion.
The shift-by-wire device according to claim 1, wherein at least one flat portion that contacts the flat portion of the fitting insertion hole is formed on an outer periphery of the first shaft. In the shift-by-wire device according to any one of claims 1 to 3,
The control device is disposed outside the case, and the rotational position detection sensor is integrated with the control device.

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