JP2011185296A - Transmission with detent mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission with a detent mechanism shortening a shift time by reducing driving force required of a shift actuator in shifting. <P>SOLUTION: The transmission with the detent mechanism includes detent recesses 7 formed in a plurality of parts of a shift shaft 4; a detent ball 8 facing the detent recess 7 when a sleeve 5 is located in a predetermined position; a spring member 10 mounted to a fixed part 9 and pressing the detent ball 8 toward the shift shaft 4 to fit the detent ball to the detent recess 7; and a relaxing actuator 11 relaxing pressing of the detent ball 8 against the spring member 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a transmission with a detent mechanism in which a gear is engaged and disengaged by a shift actuator and a gear is held by a detent mechanism, and a detent that can reduce a driving force required for the shift actuator during a shift and shorten a shift time. The present invention relates to a transmission with a mechanism.

  In a vehicle transmission, the shift feeling greatly affects the image of the driver with respect to the vehicle. Among transmissions, when an automatic transmission manual transmission (AMT) transmission is compared with an automatic transmission (AT) transmission using a planetary gear mechanism, it is possible to perform a shift without any special operation by the user. The AMT type transmission has a longer shift time than the AT type transmission. For this reason, many users are dissatisfied with the shift feeling of AMT. Therefore, in the AMT type transmission, it is a problem to shorten the shift time.

  As shown in FIG. 7, an AMT type transmission (transmission with a detent mechanism) 71 is arranged coaxially with the main shaft 2 and the main shaft 2, and can be rotated with respect to the main shaft 2 (here, Four) main gears 72, dog gears 73 attached to the main gears 72, rotating integrally with the attached main gear 72, and rotating together with the main shaft 2, A plurality of (here, two) sleeves 5 that are movable in the axial direction, and a plurality (four here) of counter gears 74 that are always meshed with the respective main gears 72 are integrated with all the counter gears 74. And a counter shaft 75 that rotates.

  One sleeve 5 can move to a position where it meshes with the dog gear 73 on one axial side, a position where it meshes with the dog gear 73 on the opposite side in the axial direction, and a position where it does not mesh with any dog gear 73 on both sides in the axial direction. When any one of the plurality of sleeves 5 is axially moved to a position where it meshes with any dog gear 73, the power of the main shaft 2 meshes with each other via the sleeve 5 that rotates integrally with the main shaft 2. Therefore, the power of the main shaft 2 is transmitted to the main gear 72 to which the dog gear 73 is attached, and the power is transmitted to the counter shaft 75 via the counter gear 74 meshed with the main gear 72. Will be transmitted. The other main gears 72 in which the sleeve 5 is not meshed with the dog gear 73 are each idled (freely rotated with respect to the main shaft 2) via the counter gear 74.

  Four sets of the main gear 72 and the counter gear 74 are engaged with each other, but the gear ratio between the main gear 72 and the counter gear 74 is different for each set, so that the main shaft 2 depends on the selected position of the selected sleeve 5. The number of rotations and torque transmitted to the countershaft 75 are different. As a result, gear stages 4th, 3rd, 2nd, and 1st are formed.

  The mechanism for moving the sleeve 5 extends parallel to the main shaft 2 and is driven in the longitudinal direction (= the axial direction of the main shaft 2) by the shift actuator 3, and from the shift shaft 4 to the main shaft 2 And a fork 6 that urges the sleeve 5 in the axial direction and moves the sleeve 5 in an axial direction. The fork 6 is formed with semicircular arc-shaped claws 76 along the outer periphery of the sleeve 5, and flanges 77 are formed at both axial ends of the sleeve 5. By pressing the claws 76 of the fork 6 against the flange 77, The sleeve 5 is pushed out in the axial direction.

  A plurality (two in this case) of shift shafts 4 are provided, and forks 6 are attached to the respective shift shafts 4, and the forks 6 move the sleeves 5 respectively.

  The shift actuator 3 switches and drives a plurality of shift shafts 4. A shift control unit (not shown) selects the shift shaft 4 and the dog gear 73 (that is, the movement destination of the sleeve 5) corresponding to the target gear stage. The shift control unit controls the shift actuator 3 and drives the selected shift shaft 4 to move the fork 6 in the longitudinal direction, thereby moving the sleeve 5 and meshing with the selected dog gear 73. In this way, gearing at the time of shifting is achieved. When the gear is disengaged, the shift shaft 4 is moved in the opposite direction to the gear engagement.

JP 2007-257443 A JP 2007-192353 A

  In the AMT type transmission, one of the factors that greatly affect the shift time is the detent force of the detent (detent) mechanism.

  The detent mechanism is a mechanism for maintaining the gear stage even after the gear is engaged at the time of shifting. As shown in FIG. 8, the detent mechanism 81 includes a detent recess 7 formed at a plurality of locations of the shift shaft 4, a detent ball 8 that faces the detent recess 7 when the sleeve 5 is positioned at a predetermined position, and a housing. And a spring member 10 that is attached to a fixed portion 9 such as a body and that presses the detent ball 8 toward the shift shaft 4 to fit into the detent recess 7.

  In the detent mechanism 81, in a state where the detent ball 8 comes off the detent recess 7 and hits the flat surface of the shift shaft 4, the detent ball 8 rolls on the shift shaft 4, so that the shift shaft 4 is movable in the longitudinal direction. In a state where the detent ball 8 is fitted in the detent recess 7, the shift shaft 4 is held.

  The holding force generated by the detent mechanism 81 is called detent force. Specifically, the detent force is a force that prevents the detent ball 8 from getting over the edge of the detent recess 7. If the detent force is weak, the detent ball 8 will come out of the detent recess 7 and the shift shaft 4 will move easily. The stage cannot be maintained. Conventionally, the detent force is set to be strong so as not to easily lose gear.

  However, the detent force is necessary to prevent gear disengagement after gearing, while it is a force that counteracts the driving force of the shift shaft 4 at the time of shifting (during gear removal and gearing operation). . Therefore, a force that allows the detent ball 8 to get over the edge of the detent recess 7 must be applied to the shift shaft 4. Overcoming this power is called force. The shift actuator 3 drives the shift shaft with a driving force exceeding the overcoming force. Therefore, if the detent force (= overcoming force) is strong, the shift actuator 3 must drive the shift shaft 4 with a strong driving force.

  Further, when the detent force is strong, the shift shaft 4 starts moving smoothly at the start of the shift, and the shift time becomes longer.

  In addition, after the detent ball 8 gets over the edge of the detent recess 7, the driving force required for the shift shaft 4 rapidly decreases, and the driving force output by the shift actuator 3 becomes relatively large. Control for driving the shaft 4 with an appropriate force or speed becomes difficult. At this time, in order to move the shift shaft 4 precisely, advanced feedback control for controlling the driving force output from the shift actuator 3 in accordance with the required driving force fluctuation is required. It leads to up. However, if the powerful shift actuator 3 is simply mounted without performing feedback control, an excessive input may destroy the mechanism that moves the sleeve 5.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transmission with a detent mechanism that solves the above-described problems, reduces the driving force required for a shift actuator during a shift, and shortens the shift time.

  In order to achieve the above object, the present invention is an automatic transmission type manual transmission type transmission that extends parallel to the main shaft and is driven in the axial direction of the main shaft by a shift actuator; A fork that hangs down from the shift shaft toward the sleeve on the main shaft and rotatably grips the sleeve, and pushes the sleeve in the axial direction, and detents formed at a plurality of locations on the shift shaft A recess, a detent ball that faces the detent recess when the sleeve is positioned at a predetermined position, and a spring member that is attached to a fixed portion and that presses the detent ball toward the shift shaft and fits into the detent recess And the detent against the spring member It is obtained by a relaxation actuator to relax the pressing of.

  The relaxation actuator may be a solenoid in which a plunger driven by electromagnetic force is inserted between the detent ball and the spring member.

  The relaxation actuator may be a fluid actuator having a piston driven by a fluid.

  A climbing sensor for detecting that the detent ball has come out of the detent indentation, and operating the relaxation actuator at the start of shifting, the detent ball has come out of the detent indentation, and then fitted into the detent indentation. A detent control unit that deactivates the relaxation actuator when detected or when a predetermined time has elapsed may be provided.

  The present invention exhibits the following excellent effects.

  (1) The driving force required for the shift actuator at the time of shifting can be reduced.

  (2) The shift time can be shortened.

1 is an overall configuration diagram of a transmission with a detent mechanism showing an embodiment of the present invention. FIG. 2 is a detailed configuration diagram of a detent mechanism portion when the first embodiment is applied to a relaxation actuator in the transmission with the detent mechanism of FIG. 1. It is the flowchart which showed the procedure which determines the start of overcoming force relaxation control. It is the flowchart which showed the procedure of overcoming force relaxation control. FIG. 6 is a detailed configuration diagram of a detent mechanism portion when the second embodiment is applied to a mitigation actuator in the transmission with the detent mechanism of FIG. 1. FIG. 10 is a detailed configuration diagram of a detent mechanism portion when the third embodiment is applied to a mitigation actuator in the transmission with the detent mechanism of FIG. 1. It is a whole block diagram of the transmission with the conventional detent mechanism. It is a detailed block diagram of the conventional detent mechanism.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, a transmission 1 with a detent mechanism according to the present invention is an automatic transmission type manual transmission type transmission that extends parallel to a main shaft 2 and is shifted by a shift actuator 3 to the main shaft 2. A shift shaft 4 that is driven in the axial direction, and a fork that is suspended from the shift shaft 4 toward the sleeve 5 on the main shaft 2 to grip the sleeve 5 in a rotatable manner, and push the sleeve 5 in the axial direction to move it. 6. The configuration so far is the same as the conventional transmission 71 with the detent mechanism described in FIG.

  As shown in FIG. 2, the detent mechanism 21 used in the transmission 1 with the detent mechanism includes a detent recess 7 formed at a plurality of positions of the shift shaft 4 and a detent recess 7 when the sleeve 5 is positioned at a predetermined position. A detent ball 8 that is directly opposed to the shaft, a spring member 10 that is attached to a fixed portion 9 such as a transmission housing, presses the detent ball 8 toward the shift shaft 4 and fits into the detent recess 7, and resists the spring member 10. And a relaxation actuator 11 that relaxes the pressing of the detent ball 8. The detent mechanism 21 is substantially the same as the conventional detent mechanism 81 except for the relaxation actuator 11.

  As described above, the transmission 1 with the detent mechanism in FIG. 1 has a configuration in which the relaxation actuator 11 is added to the transmission 71 with the detent mechanism.

  The detent mechanism-equipped transmission 1 includes a conventionally known shift control unit 12 that controls the shift actuator 3 to engage and disengage a gear. The shift control unit 12 is configured to output a shift period signal indicating that a shift period is in progress when the shift actuator 3 is shifting. The transmission 1 with the detent mechanism operates the mitigation actuator 11 when the shift control unit 12 starts shifting, and detects that the detent ball 8 is detached from the detent recess 7 and then the detent ball 8 is fitted in the detent recess 7. The detent control part 13 which makes the relaxation actuator 11 non-actuated is provided when a predetermined time has elapsed. The shift control unit 12 and the detent control unit 13 may be incorporated as a program in an electronic control unit (ECU). A driver 14 such as a relay that drives the relaxation actuator 11 based on the detent force relaxation signal output from the detent control unit 13 is connected to the detent control unit 13.

  The detent mechanism 21 will be described in more detail.

  As shown in FIG. 2, the detent mechanism 21 has a casing 22 attached to a fixed portion 9 such as a transmission housing. The casing 22 includes a hollow cylindrical barrel portion 23, a screw portion 24 formed on the distal end side of the barrel portion 23 and having a thread on the outer periphery, and a hexagonal column-shaped screw head formed on the proximal end side of the barrel portion 23. 25. A screw hole 26 is formed in the fixing portion 9, and the casing 22 can be detachably attached by screwing the screw portion 24 and the screw hole 26. A cylindrical spring chamber 27 that is coaxial with the casing 22 and opened at the distal end side is formed at the base end side in the casing 22, and a spring member 10 made of a coil spring is placed coaxially within the spring chamber 27. Protrudes from the opening of the spring chamber 27 toward the tip side.

  The relaxation actuator 11 in the present embodiment is a solenoid 29 in which a plunger 28 driven by electromagnetic force is inserted between the detent ball 8 and the spring member 10. The solenoid 29 includes a plunger 28 and a coil 30 wound around the plunger 28. The plunger 28 is a cylindrical iron bar, and when the coil 30 generates a magnetic flux, a force acts on the proximal end side.

  On the base end side of the plunger 28, a spring lid 31 is formed in which the protruding portion of the spring member 10 is accommodated. The spring lid 31 accommodates the protruding portion of the spring member 10 coaxially. The distal end side of the plunger 28 is in contact with the detent ball 8, and the detent ball 8 is fitted in the detent recess 7. The coil 30 is wound so as to surround the outer periphery of the spring chamber 27 and the outer periphery of the plunger 28 from the proximal end side of the spring member 10 to the vicinity of the distal end of the plunger 28. The screw part 24 is formed with a detent ball in / out hole 32 that holds the detent ball 8 in a freely rolling manner and allows the displacement in the direction of approaching and separating from the shift shaft 4. When the detent ball 8 is disengaged from the detent recess 7, the detent ball 8 comes into contact with the flat portion of the shift shaft 4, so that the detent ball 8 enters the detent ball in / out hole 32 rather than the illustrated position.

  The relaxation actuator 11 does not pull the detent ball 8 into the detent ball in / out hole 32 but gives a force to pull the detent ball 8 to such an extent that the overcoming force can be reduced. The magnitude of the force for pulling the detent ball 8 by the relaxation actuator 11 may be set by experiment or the like.

  The detent recess 7 is disposed at a predetermined position of the shift shaft 4. Here, the predetermined position refers to a state where the detent ball 8 and the detent recess 7 face each other when the sleeve 5 is completely engaged with the dog gear 73 as shown in FIG. It is a position. The installation position of the detent mechanism 21 is not limited to FIG. Since the spring member 10 presses the detent ball 8 toward the shift shaft 4 via the plunger 28 as shown in FIG. 2 at any position, if the detent ball 8 and the detent recess 7 face each other, The detent ball 8 is fitted in the detent recess 7.

  Two or more detent recesses 7 are formed in one shift shaft 4. For example, as shown in FIG. 1, in a configuration in which one sleeve 5 is geared to a fourth gear dog gear 73 and a third gear dog gear 73, the sleeve 5 meshes with the fourth gear dog gear 73 and the third gear dog gear 73. Detent recesses 7 are formed at three positions in the longitudinal direction of the shift shaft 4 so as to correspond to the position and the neutral position in between. When the dog gear 73 is only on one side of the sleeve 5, the detent recess 7 may be two places.

  Although not shown in FIG. 2, the detent mechanism 21 includes a climbing sensor that detects that the detent ball 8 has come out of the detent recess 7. As the climbing sensor, for example, a displacement sensor that detects the displacement of the detent ball 8 or the displacement of the plunger 28 is used, and the displacement of the detent ball 8 from the position when the detent ball 8 is fitted in the detent recess 7 is a predetermined value. It can be detected that the detent ball 8 has come out of the detent recess 7 by exceeding. Further, if the displacement of the detent ball 8 becomes a predetermined value or less, it can be detected that the detent ball 8 is fitted in the detent recess 7.

  In FIG. 2, the detent mechanism 21 is attached to one shift shaft 4. However, in a transmission having a plurality of shift shafts 4, the detent mechanism 21 is attached to each shift shaft 4.

  Next, the operation of the detent mechanism 21 in the transmission 1 with the detent mechanism according to the present invention will be described according to the control procedure in the detent control unit 13.

  First, the detent control unit 13 determines the start of the overcoming force relaxation control in the procedure of FIG. In step S31, the detent control unit 13 refers to the shift period signal output from the shift control unit 12 and determines whether or not the present is in the shift period. If the current shift is already in progress, the process returns to step S31. If the current shift is not in progress, the process proceeds to step S32. In step S32, the detent control unit 13 refers to the shift period signal output from the shift control unit 12 and determines whether or not the present is in the shift period. If the present time is not during the shift period, the process returns to step S32. If the current shift is in progress, the process ends and the overcoming force relaxation control is started.

  According to the control procedure of FIG. 3, when the shift period continues, this control procedure does not end, and when the shift period ends, a state other than the shift period continues. This control procedure never ends. This control procedure ends only at the moment when the shift period is reached from the state that is not the shift period. Therefore, the start of the shift period is detected by this control procedure. This control procedure is effective when the detent control unit 13 is added without modifying or changing the design of the existing shift control unit 12. If the speed change control unit 12 is remodeled / designed, the detent control unit 13 may be included in the speed change control unit 12, so that it is not necessary to detect the start of the speed change period.

  Next, the detent control unit 13 executes the overcoming force relaxation control according to the procedure of FIG. In step S41, the detent control unit 13 stores the processing start time in the memory. The time does not need to be the actual time obtained from a clock, and may be a count of timer clocks generated at an appropriate period.

  In step S42, the detent control unit 13 turns on the detent force relaxation signal. When the detent force relaxation signal is turned on, the driver 14 drives the relaxation actuator 11. A current flows through the coil 30, and the plunger 28 is pulled toward the proximal end against the spring member 10, and the pressing of the detent ball 8 toward the detent recess 7 of the shift shaft 4 is alleviated. On the other hand, the speed change control unit 12 controls the shift actuator 3 in accordance with a speed change control procedure (not shown) to engage and disengage the gear, whereby the shift shaft 4 is driven in the longitudinal direction, and the shift fork 6 is connected to the sleeve. 5 is pushed and moved in the axial direction of the main shaft 2. At this time, since the detent ball 8 comes out of the detent recess 7 and hits the flat surface of the shift shaft 4, the detent ball 8 is greatly displaced, and a get-over signal from a not-shown ride-over sensor exceeds a predetermined value. When the sleeve 5 arrives at a predetermined position, the detent ball 8 again faces the detent recess 7, so that the detent ball 8 fits into the detent recess 7 and the ride-over signal from the ride-over sensor returns to a predetermined value or less.

  In step S43, the detent control unit 13 determines whether or not the ride over of the detent ball 8 is completed with reference to the ride over signal from the ride over sensor. That is, if the detent ball 8 is first disengaged from the state in which the detent ball 8 is fitted in the detent hollow 7 and is fitted in the detent hollow 7 again, the detent ball 8 has moved to the detent hollow 7. , Recognize that gearing or gearing has been achieved. If overcoming is completed in this way, the process proceeds to step S44. In step S44, the detent control unit 13 turns off the detent force relaxation signal. When the detent force relaxation signal is turned off, the current of the coil 30 is interrupted, so that the detent ball 8 is pressed, that is, the detent force is restored.

  If overcoming is not completed in step S43, the process proceeds to step S45. In step S45, the detent control unit 13 determines whether or not the processing elapsed time has exceeded a predetermined set value. The processing elapsed time is the time during which the detent force relaxation by the relaxation actuator 11 has elapsed, and is obtained from the difference between the current time and the processing start time stored in the memory. If the elapsed processing time is less than or equal to the set value, the process returns to step S43. If the elapsed processing time exceeds the set value, the process proceeds to step S44.

  In this way, the reason for setting the processing elapsed time is that the gear-engaging / un-gearing operation does not take a long time, and if the processing elapsed time exceeds the set value, the detent force is regarded as abnormal. Restore.

  As described above, according to the present invention, the detent force (= overcoming force) in the detent mechanism 21 is relieved, so that the driving force of the shift shaft 4 required during shift control can be reduced. As a result, the shift shaft 4 starts moving smoothly at the start of shifting, and the shifting time is shortened.

  According to the present invention, the output required for the shift actuator 3 can be reduced by reducing the driving force of the shift shaft 4, and the strength of the members such as the shift shaft 4 can be reduced. The shift actuator 3 can be made smaller than before, and the transmission can be made smaller and lighter. As a result, the cost can be reduced.

  On the other hand, when the strength of the member is kept the same as before, the force applied at the time of shifting is reduced, thereby preventing the member from being damaged by an excessive force.

  In the detent mechanism 21 of the present invention, even if the mitigation actuator 11 fails and does not operate, the pressing force by the spring member 10 does not change, so the detent force acts. Therefore, no trouble such as gear loss occurs even when the mitigation actuator 11 fails.

  Next, another embodiment related to the relaxation actuator 11 will be described.

  As shown in FIG. 5, in the second embodiment, the detent mechanism 51 has a casing 52 attached to a fixed portion 9 such as a transmission housing. The casing 52 includes a cylindrical body 53, a screw part 24 formed on the distal end side of the body part 53 and having a thread on the outer periphery, and a hexagonal column-shaped screw head 25 formed on the base end side of the body part 53. It consists of. A screw hole 26 is formed in the fixing portion 9, and the casing 52 can be detachably attached by screwing the screw portion 24 and the screw hole 26. Inside the casing 52, a cylinder chamber 54 is formed on the screw head 25 side of the trunk portion 53, a spring chamber 55 is formed from the trunk portion 53 to the screw portion 24, and the detent ball 8 is rolled on the screw portion 24. A detent ball in / out hole 32 is formed which is freely held and allows displacement in the direction of approaching and separating from the shift shaft 4. A pressing plate 56 is in contact with the detent ball 8, and the spring member 10 is inserted between the pressing plate 56 and the base end portion of the spring chamber 55.

  The relaxation actuator 11 has a piston 57 composed of a piston head in the cylinder chamber 54 and a piston rod that passes from the cylinder chamber 54 to the spring chamber 55, and a pressing plate 56 is integrated with the piston rod of the piston 57. The fluid actuator 58 is configured to be able to supply and discharge working fluid such as air and oil to the piston rod side of the chamber 54. The driver 14 is a solenoid valve. The working fluid is supplied from a positive pressure source. By supplying the working fluid to the piston rod side of the cylinder chamber 54 by the driver 14, a force acts on the piston 57 and the detent force is alleviated.

  As shown in FIG. 6, in the third embodiment, the detent mechanism 61 has a casing 62 attached to a fixed portion 9 such as a transmission housing. The casing 62 includes a cylindrical body portion 63, a screw portion 24 formed on the distal end side of the body portion 63 and having a thread on the outer periphery, and a hexagonal column-shaped screw head 25 formed on the proximal end side of the body portion 63. It consists of. A screw hole 26 is formed in the fixing portion 9, and the casing 62 can be detachably attached by screwing the screw portion 24 and the screw hole 26. Inside the casing 62, a cylinder chamber 64 is formed in the barrel portion 63, and a spring chamber 65 is formed from the barrel portion 63 to the screw portion 24. The detent ball 8 is held in the screw portion 24 so as to be freely rollable and shifted. A detent ball in / out hole 32 is formed to allow and accommodate displacement in a direction of approaching and separating from the shaft 4. A pressing plate 66 is in contact with the detent ball 8, and the spring member 10 is inserted between the pressing plate 66 and the base end portion of the spring chamber 65.

  The relaxation actuator 11 has a columnar piston 67 that passes from the cylinder chamber 64 to the spring chamber 65, a pressing plate 66 is integrated with the piston 67, and supply and discharge of working fluid such as air and oil to the cylinder chamber 64. The fluid actuator 68 is configured to be capable of. The driver 14 is a solenoid valve. The working fluid is supplied from a negative pressure source. By discharging the working fluid from the cylinder chamber 64 by the driver 14, a force acts on the piston 67 and the detent force is reduced.

  In the embodiment described so far, the detent ball 8 may be formed integrally with the pressing plates 56 and 66 and the pistons 57 and 67. Further, the detent ball 8 and the plunger 28 may be integrally formed.

DESCRIPTION OF SYMBOLS 1 Transmission with a detent mechanism 2 Main shaft 3 Shift actuator 4 Shift shaft 5 Sleeve 6 Fork 7 Detent hollow 8 Detent ball 9 Fixing part 10 Spring member 11 Mitigation actuator 12 Shift control part 13 Detent control part 14 Driver 21, 51, 61 Detent mechanism 29 Solenoid 58, 68 Fluid actuator

Claims (4)

An automatic transmission manual transmission transmission,
A shift shaft extending parallel to the main shaft and driven in the axial direction of the main shaft by a shift actuator;
A fork that hangs down from the shift shaft toward the sleeve on the main shaft and rotatably grips the sleeve, and pushes and moves the sleeve in the axial direction;
Detent depressions formed at a plurality of locations of the shift shaft;
A detent ball that faces the detent recess when the sleeve is in place;
A spring member that is attached to a fixed portion and presses the detent ball toward the shift shaft to fit into the detent recess;
A transmission with a detent mechanism, comprising: a relaxation actuator that relaxes the pressing of the detent ball against the spring member.   2. The transmission with a detent mechanism according to claim 1, wherein the relaxation actuator is a solenoid in which a plunger driven by electromagnetic force is inserted between the detent ball and the spring member.   3. The transmission with a detent mechanism according to claim 1, wherein the relaxation actuator is a fluid actuator having a piston driven by a fluid.   A get-over sensor that detects that the detent ball has come out of the detent indentation, and that the mitigation actuator is actuated at the start of shifting, so that the detent ball has come out of the detent indentation and then fitted into the detent indentation. The detent mechanism-equipped transmission according to any one of claims 1 to 3, further comprising a detent control unit that deactivates the mitigation actuator when detected or when a predetermined time has elapsed.

Images