JP2016113044A - Shift device of automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shift device of an automatic transmission, that is based on a cable type shift device and can be changed to a by-wire type shift device only by installing a small amount of components.SOLUTION: A cable type shift device 1 is basic, that performs shift operation of an automatic transmission by a shift cable 2. A switch to be detected is mounted on a shift lever 3. A new switch unit 11 containing a plurality of range detection switches is mounted on the shift device 1 by retrofitting. The shift device becomes a by-wire type that performs shift operation of the automatic transmission by a detection signal from the range detection switches.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shift device for an automatic transmission.

  Conventionally, as shown in FIG. 8 (a), there is a cable type shift device in which an automatic transmission is shifted by a shift cable 31 that is interlocked with a shift operation of a shift lever 30 (see Patent Document 1).

  The shift lever 30 is supported by a transmission switching member 33 attached to the base body 32 so as to be swingable in the shift direction. The transmission switching member 33 is provided with a cable connecting shaft 34 for connecting the other end 31a of the shift cable 31 having one end connected to the automatic transmission.

  Further, as shown in FIG. 8B, there is a by-wire type shift device in which a shift operation of the shift lever 30 is detected by a sensor 36, and the automatic transmission is shifted by an electric actuator driven by the detection signal ( Patent Document 2).

  The shaft 37 of the shift lever 30 is fitted into the sensor unit 39 on the side of the base housing 38 and connected to the fan-shaped plate 40.

  As the sensor 36, a magnet 41a and two MRE elements 41b and 41c, a projecting piece 42a, two photo interrupters 42b and 42c, two micro switches 43a and 43b, and the like are provided.

  At present, cable shift devices are the mainstream, but demand for by-wire shift devices is also increasing.

JP 2010-280349 A JP 2003-154868 A

  However, in order to change an existing cable type shift device to a by-wire type shift device, a large modification is required. In particular, in the case of high-mix low-volume production, manufacturing a by-wire shift device separately from the cable shift device has a problem that the cost becomes very high.

  The present invention has been made to solve the above problems, and is based on a cable-type shift device, and can be changed to a by-wire type shift device by simply adding a small amount of parts afterward. The object is to provide an apparatus.

  In order to solve the above-mentioned problems, the present invention is a cable-type shift device in which an automatic transmission is shifted with a shift cable. A switch to be detected is attached to the shift lever side of the shift device and is displaced in conjunction with the shift lever. A new switch unit is provided that is attached to a side portion of the shift device, and stores a plurality of range detection switches for detecting the displacement position of the switch to be detected of the shift lever, instead of the shift cable. A by-wire system is employed in which the automatic transmission is shifted by a detection signal from the range detection switch.

  According to the present invention, in order to change to a by-wire type shift device based on a cable type shift device, the displacement position of the switch to be detected of the shift lever is changed to the side of the shift device instead of the shift cable. Install a new switch unit that houses multiple range detection switches to be detected.

  As a result, the automatic transmission is shifted by the detection signal of the range detection switch as a by-wire system.

  As described above, in order to change the cable-type shift device to the by-wire type shift device, basically, a new switch unit as a small amount of components is simply installed. Therefore, it is not necessary to manufacture a by-wire type shift device separately from the cable type shift device, and the cost of changing to the by-wire type shift device is very low.

  The new switch unit includes a case and a cover that closes the case, a swing bar that holds the detected switch in the case, and a swing direction of the detected switch by the range detection switch. And a substrate mounted on the board. The shift lever may have a configuration in which an interlocking shaft that is fitted in the case and engaged with the swing bar is attached.

  According to this configuration, the swing bar holding the detected switch and the substrate on which the range detection switch is mounted in the swing direction of the detected switch are mounted in the case of the new switch unit. Further, the interlocking shaft attached to the shift lever is fitted into the case and engaged with the swing bar when the new switch unit is retrofitted to the side of the shift device.

  Thus, when the new switch unit is attached to the side of the shift device as a retrofit, the interlock shaft of the shift lever automatically engages with the swing bar in the case. When the swing bar swings in conjunction with the shift operation of the shift lever, the switch to be detected is detected by the range detection switch, and the electric actuator is driven by the detection signal to automatically The transmission is shifted.

  Both the cable connection shaft and the interlocking shaft are attached to the shift lever. When changing to a by-wire type shift device, the cable connection shaft is left as it is, and only the interlocking shaft is used. . Conversely, in the case of a cable type shift device, the interlocking shaft is left as it is, and only the cable connecting shaft is used. This eliminates the need for work to replace the cable connecting shaft and the interlocking shaft.

  The center of rotation of the swing bar may be configured to be coaxial with the center of rotation of the shift lever or on the center line of the operating range of the shift lever.

  According to this configuration, it becomes easy to form a horizontal oblong hole for fitting the interlocking shaft to be inserted into the case, and the operability of the interlocking shaft can be secured. In addition, since the vertical swing angle of the interlocking shaft in the vertically long hole of the swing bar is small, it is difficult to be affected by manufacturing errors, and accuracy can be ensured.

  A sub-CPU for a by-wire system that is housed in the new switch unit and to which the range detection switch is connected is provided. A key interlock detection switch, a shift lock solenoid, and an M range switch housed in the existing switch unit of the shift device are provided. A new harness for connecting the key interlock detection switch and shift lock solenoid of the existing switch unit to the main CPU of the in-vehicle control unit, connecting the M range switch to the sub CPU, and connecting the sub CPU to the main CPU. A unit is provided. Each signal of the range detection switch and the M range switch is processed by the sub CPU, and the detection signal is transmitted to the main CPU of the in-vehicle control unit via the new harness unit. The automatic transmission can be shifted by the output signal of the main CPU. Here, CPU is an abbreviation for Central Processing Unit.

  According to this configuration, in addition to the main CPU of the in-vehicle control unit, the new switch unit houses the sub CPU for the by-wire system. Then, the sub CPU processes each signal of the range detection switch and the M range switch, and transmits the detection signal to the main CPU via the new harness unit, thereby shifting the automatic transmission with the output signal of the main CPU. To do.

  As a result, almost all detection signals necessary for the by-wire system can be processed by the sub CPU program, transmitted to the main CPU via the new harness unit, and the automatic transmission can be shifted by the output signal of the main CPU. Become. Therefore, the burden on the main CPU can be reduced.

  Further, since the sub CPU and the main CPU can perform bidirectional communication, for example, by can communication via the new harness unit, the sub CPU and the main CPU can be controlled with each other.

  Furthermore, if a new harness unit is provided along with the old harness unit that connects the key interlock detection switch, shift lock solenoid, and M range switch of the existing switch unit to the main CPU, the old and new harness units can be replaced, A method and a cable method can be selected.

  According to the present invention, it is possible to change to a by-wire type shift device at a low cost simply by attaching a small amount of components based on a cable type shift device.

1 is a perspective view of a shift device for an automatic transmission according to the present invention. It is a perspective view which shows the relationship between the existing switch unit of a cable system, the new switch unit of a by-wire system, and a new harness unit. It is a disassembled perspective view of a new switch unit. It is a front view in the case of a new switch unit. (A) is a front view showing the relationship between the swing bar of the P range and the P range detection switch of the substrate, and (b) is a front view showing the relationship between the swing bar of the R range and the R range detection switch of the substrate. FIG. (A) is a front view showing the relationship between the N range swing bar and the substrate N range detection switch, (b) is a front view showing the relationship between the D range swing bar and the substrate D range detection switch. FIG. FIG. 3 is a connection diagram of an existing switch unit, a new switch unit, and a main CPU. It is background art, (a) is an exploded perspective view of the shift device of Patent Document 1, and (b) is an exploded perspective view of the shift device of Patent Document 2.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a shift device 1 of an automatic transmission. FIG. 2 is a perspective view showing the relationship among the cable type existing switch unit 10, the by-wire type new switch unit 11, and the new harness unit 15.

  The shift device 1 in FIG. 1 is basically a cable-type shift device in which an automatic transmission (see FIG. 7) 19 is speed-changed by a shift cable 2 indicated by a two-dot chain line.

  Since the basic structure of the shift device 1 is substantially the same as that of the cable type shift device of Patent Document 1, the outline will be described within a necessary range. The shift lever 3 is supported by a transmission switching member 5 (see FIG. 3) attached to the base body 4 so as to be swingable in the shift direction. The transmission switching member 5 is provided with a cable connecting shaft 6 for connecting the other end 2a of the shift cable 2 whose one end is connected to the automatic transmission.

  A gate block body 7 that accommodates the transmission switching member 5 is attached to the base body 4, and a gate 7 a through which the shift lever 3 passes is formed in the gate block body 7. A parking range P, a reverse range R, a neutral range N, a drive range D, and a manual range M are set in the gate 7a. A gate plate (not shown) is attached to the upper surface of the gate 7a, and marks P, R, N, D, and M (+, −) indicating the position of each gate are applied to the gate plate. .

  A cable-type existing switch unit 10 is attached to one side (left side in FIG. 1) of the gate block body 7, and a new by-wire type switch is attached to the other side (right side in FIG. 1). A unit 11 is attached later.

  As shown in FIG. 7, the existing switch unit 10 houses a key interlock detection switch 12, a shift lock solenoid 13, and an M range switch 14 that are also required in the cable system.

  As shown in FIGS. 1 and 7, the key interlock detection switch 12 and the shift lock solenoid 13 of the existing switch unit 10 are connected to a harness 15 a from a connector 27 a coupled to the existing switch unit 10. The harness 15a is connected to the main CPU 17 through a connector 27c coupled to the vehicle-mounted control unit 16.

  The M range switch 14 is connected to a harness 15b from a connector 27a coupled to the existing switch unit 10. The harness 15b is connected to the sub CPU 18 from a connector 27b coupled to the new switch unit 11.

  Further, the sub CPU 18 of the new switch unit 11 is connected to the harness 15c from the connector 27b. The harness 15c is connected to the main CPU 17 through a connector 27c coupled to the vehicle-mounted control unit 16. Here, the harnesses 15 a, 15 b and 15 c constitute a new harness unit 15.

  The key interlock detection switch 12 controls a key solenoid (not shown) so that the key is released only when the shift lever 3 is shifted to the parking range P. The shift lock solenoid 13 allows the shift lever 3 to be shifted from the parking range P to another range only when the brake pedal is depressed.

  The key interlock detection switch 12 and the shift lock solenoid 13 are controlled by the main CPU 17 of the control unit 16 in the cable system and the by-wire system. The M range switch 14 is controlled by the main CPU 17 of the control unit 16 in the cable system, but is controlled by the sub CPU 18 of the new switch unit 11 in the by-wire system.

  The new switch unit 11 includes a case 20 and a cover 21 that closes the case 20 as shown in FIG.

  The case 20 is closed with the cover 21, and bolts (not shown) are respectively inserted into the bolt holes 28 (see FIG. 4) in the flange portions of the case 20 and the cover 21. With these three bolts, a new by-wire switch unit 11 can be retrofitted to the side of the gate block 7.

  In the new switch unit 11, a plurality of range detection switches 22a, 22b, 22c, and 22d that detect the displacement position of a switch (to be described later) 24 of the shift lever 3 and that are required by the by-wire method are housed. The range detection switches 22a to 22d are provided at the top and bottom two for each range and play a role of failure detection.

  Here, the switch 22a is a P range detection switch, the switch 22b is an R range detection switch, the switch 22c is an N range detection switch, and the switch 22d is a D range detection switch.

  As shown in FIG. 5A, the switches 22 a to 22 d are attached to the substrate 23 side by side in the swing direction of a switch to be detected (described later) 24. In this example, each of the switches 22a to 22d is a Hall IC.

  As shown in FIG. 3, a detected switch 24 that is displaced in conjunction with the shift lever 3 is attached to the shift lever 3 side. Specifically, an interlocking shaft 25 that fits into the case 20 from the laterally long hole 20 a of the case 20 is attached to the shift lever 3. Further, as shown in FIG. 4, a swing bar 26 that holds the switch to be detected 24 is attached to the case 20 by a support shaft portion 20b.

  The rotation center O1 of the swing bar 26 is most preferably set coaxially with the rotation center O2 of the shift lever 3, but in this embodiment, it is set on the center line C of the operating range θ of the shift lever 3. .

  The interlocking shaft 25 of the shift lever 3 is engaged with the elongated hole 26 a of the swing bar 26, so that the detected switch 24 swings and displaces together with the swing bar 26 in conjunction with the shift lever 3. In this example, the detected switch 24 is a magnet.

  The switches 22a to 22d of the Hall IC and the detected switch 24 of the magnet constitute a non-contact switch (sensor).

  When the shift lever 3 is swung to the parking range P, the reverse range R, the neutral range N, and the drive range D, the detected switch 24 is swung together with the swinging bar 26 that is swung by the interlocking shaft 25. As shown in FIG. 5A, when the switch 24 to be detected faces the P range detection switch 22a, a detection signal of the P range is output from the switch 22a. As shown in FIG. 5B, when the switch 24 to be detected faces the R range detection switch 22b, an R range detection signal is output from the switch 22b.

  Further, as shown in FIG. 6A, when the detected switch 24 faces the N range detection switch 22c, the N range detection signal is output from the switch 22c. As shown in FIG. 6B, when the switch 24 to be detected faces the D range detection switch 22d, a detection signal of the D range is output from the switch 22d.

  The range detection switches 22a to 22d and the M range switch 14 are connected to the sub CPU 18 of the new switch unit 11, and each signal of the range detection switches 22a to 22d and the M range switch 14 is processed by the sub CPU 18. The The detection signal is transmitted to the main CPU 17 of the vehicle-mounted control unit 16 via the harness 15c of the new harness unit 15.

  Then, when the electric actuator is driven by the output signal of the main CPU 17, the automatic transmission 19 is operated to change speed.

  If the shift device of the automatic transmission is configured as described above, the automatic transmission 19 is first shifted by the electric actuator in order to change to the by-wire shift device 1 on the basis of the cable shift device 1. Replace with operated by-wire system.

  Then, instead of the shift cable, a new switch unit 11 containing a plurality of range detection switches 22a to 22d for detecting the displacement position of the detected switch 24 of the shift lever 3 is attached to the side portion of the shift device 1 as a retrofit. .

  Accordingly, as a by-wire system, the automatic transmission 19 is shifted by driving the electric actuator with the detection signals of the range detection switches 22a to 22d.

  As described above, in order to change the cable type shift device 1 to the by-wire type shift device 1, basically, a new switch unit 11 as a small amount of components is simply attached later. Therefore, it is not necessary to manufacture the by-wire type shift device 1 separately from the cable type shift device 1, and the cost of changing to the by-wire type shift device 1 is very low.

  Further, the swing bar 26 holding the detected switch 24 and the substrate 23 on which the range detection switches 22 a to 22 d are mounted in the swing direction of the detected switch 24 are mounted in the case 20 of the new switch unit 11. The interlocking shaft 25 attached to the shift lever 3 is fitted into the case 20 from the laterally long hole 20a when the new switch unit 11 is retrofitted to the side of the shift device 1, and the longitudinally long hole 26a of the swinging bar 26 is attached. Will come into engagement.

  Thus, when the new switch unit 11 is attached to the side portion of the shift device 1 as a retrofit, the interlocking shaft 25 of the shift lever 3 is engaged with the swing bar 26 in the case 20. Then, as the swing bar 26 swings in conjunction with the shift operation of the shift lever 3, the detected switch 24 is detected by the range detection switches 22a to 22d. By driving the electric actuator with the detection signal, the automatic transmission 19 is operated to change speed.

  Both the cable connecting shaft 6 and the interlocking shaft 25 are attached to the shift lever 3, and when changing to the by-wire type shift device 1, the cable connecting shaft 6 is left as it is, and only the interlocking shaft 25 is provided. Will be used. Conversely, in the case of the cable type shift device 1, the interlocking shaft 25 is left as it is, and only the cable connecting shaft 6 is used. Therefore, the labor for replacing the cable connecting shaft 6 and the interlocking shaft 25 is not required.

  The rotation center O1 of the swing bar 26 is set coaxially with the rotation center O2 of the shift lever 3 or on the center line C of the operating range θ of the shift lever 3.

  If it does in this way, formation processing of the insertion oblong hole 20a etc. of interlocking shaft 25 inserted in case 20 will become easy, and the operability of interlocking shaft 25 will be securable. Further, since the vertical swing angle of the interlocking shaft 25 in the vertically long hole 26a of the swing bar 26 becomes small, it is difficult to be influenced by manufacturing errors, and accuracy can be ensured.

  Further, apart from the main CPU 17 of the in-vehicle control unit 16, the new switch unit 11 houses a sub-CPU 18 for a by-wire system. The sub CPU 18 processes the signals of the range detection switches 22a to 22d and the M range switch 14. The detection signal is transmitted to the main CPU 17 via the new harness unit 15, so that the main CPU 17 drives the electric actuator to shift the automatic transmission 19.

  As a result, almost all detection signals necessary for the by-wire system can be processed by the program of the sub CPU 18 and transmitted to the main CPU 17 via the new harness unit 15 to drive the electric actuator. Therefore, the burden on the main CPU 17 can be reduced.

  In addition, since the sub CPU 18 and the main CPU 17 can perform bidirectional communication, for example, by can communication via the new harness unit 15, the sub CPU 18 and the main CPU 17 can also control each other.

  Furthermore, if the new harness unit 15 is provided together with the old harness unit for connecting the key interlock detection switch 12, the shift lock solenoid 13 and the M range switch 14 of the existing switch unit 10 to the main CPU 17, the old and new harness units can be replaced. By replacing, it is possible to select a bi-wire system or a cable system.

DESCRIPTION OF SYMBOLS 1 Shift device 2 Shift cable 3 Shift lever 6 Cable connection shaft 10 Existing switch unit 11 New switch unit 12 Key interlock detection switch 13 Shift lock solenoid 14 M range switch 15 New harness unit 16 Control unit 17 Main CPU
18 Sub CPU
19 Automatic transmission 20 Case 21 Cover 22a P range detection switch 22b R range detection switch 22c N range detection switch 22d D range detection switch 23 Substrate 24 Detected switch 25 Interlocking shaft 26 Swing bar C Center line O1 Swing Rotation center of moving lever O2 Rotation center of shift lever θ Operating range

Claims (4)

In a cable-type shift device in which the automatic transmission is shifted with a shift cable,
A detected switch attached to the shift lever side of the shift device and displaced in conjunction with the shift lever;
A new switch unit that is attached to a side portion of the shift device, and stores a plurality of range detection switches for detecting the displacement position of the detected switch of the shift lever instead of the shift cable;
2. A shift device for an automatic transmission, characterized in that a by-wire system is employed in which a shift operation is performed on the automatic transmission by a detection signal of the range detection switch. The new switch unit includes a case and a cover for closing the case,
In the case, a swing bar holding the detected switch and a substrate on which the range detection switch is mounted in the swing direction of the detected switch are attached,
2. The shift device for an automatic transmission according to claim 1, wherein an interlocking shaft that fits into the case and engages with the swing bar is attached to the shift lever.   3. The automatic transmission according to claim 1, wherein a rotation center of the swing bar is set coaxially with a rotation center of the shift lever or on a center line of an operation range of the shift lever. Shift device. A sub-CPU for a by-wire system that is housed in the new switch unit and to which the range detection switch is connected;
A key interlock detection switch, a shift lock solenoid, and an M range switch housed in an existing switch unit of the shift device;
A new harness for connecting the key interlock detection switch and shift lock solenoid of the existing switch unit to the main CPU of the in-vehicle control unit, connecting the M range switch to the sub CPU, and connecting the sub CPU to the main CPU. Unit and
Each signal of the range detection switch and the M range switch is processed by the sub CPU, and the detection signal is transmitted to the main CPU of the in-vehicle control unit via the new harness unit. The shift device for an automatic transmission according to any one of claims 1 to 3, wherein the automatic transmission is operated to change speed.

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