JP2016205417A - Erroneous operation preventing mechanism for mechanical friction clutch installed transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an erroneous operation preventing mechanism for preventing a shift to a transmission stage when a clutch pedal is not operated and in turn allowing a free motion from a speed change stage position of a shift lever to a neutral position thereof.SOLUTION: There are provided: a male side member 24 having a tapered part 20a and returning back to an initial position in response to a returning operation after it is moved from the initial position before a treading operation of a clutch pedal; a female side member 26 having a second taper part 26a capable of sliding the same and movable in response to a motion of the male side member; and an engaging part 30 connected to a shift fork 20, immovably engaging the shift fork at a first engaging position 30a with the female side member when the shift fork is placed at a neutral position and the male side member is placed at the initial position, releasing the engagement when it is moved from the initial position and movably engaging the shift fork at a second engaging position 30b when the shift fork is returned back to the initial position in response to a returning operation after the shift fork is moved to a transmission stage position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an erroneous operation preventing mechanism for a mechanical friction clutch-equipped transmission, and more particularly to an erroneous operation preventing mechanism for preventing an erroneous transmission operation of the mechanical friction clutch-equipped transmission.

  Recently, the number of vehicles equipped with automatic transmissions has increased in the number of vehicles on the market, and vehicles equipped with manual transmissions still have a strong demand. When driving a vehicle equipped with such a manual transmission, there is an increased chance of riding in a vehicle equipped with an automatic transmission. Therefore, when shifting, the shift lever for shifting can be operated without operating the clutch pedal. There is a concern about the error of shifting operation.

  In this regard, in Patent Document 1, in a transmission such as a riding rice transplanter having a main clutch pedal and a main shift lever that can be operated in forward, reverse, and neutral positions, the main shift lever is not operated when the main clutch pedal is not depressed. A locking mechanism has been proposed.

JP-A-10-324170

  Since the technique described in Patent Document 1 is configured as described above, unless the main clutch pedal is depressed, the main transmission lever is always locked, and as a result, the main transmission lever is shifted in an emergency such as a clutch operation system malfunctioning. There was an inconvenience that it was not possible to quickly return from the step position to the neutral position. In addition, since the engagement body is connected and locked to the main clutch pedal via a wire cable (hereinafter referred to as “wire”), the handling distance of an erroneous operation preventing member such as a wire is increased and the apparatus is enlarged. There was also inconvenience.

  The object of the present invention is to solve the above-described problems and prevent shifting from the neutral position to the gear position when there is no clutch pedal operation, while the shift lever for shifting is freely moved from the gear position to the neutral position. It is an object of the present invention to provide a mechanism for preventing erroneous operation of a mechanical friction clutch-equipped transmission that permits the above-described mechanism.

  In order to solve the above-described problem, in claim 1, the drive shaft is inserted between an output shaft of a drive source mounted on a vehicle and the transmission, and is pressed against the output shaft by a spring to A clutch disk that transmits output to the transmission; a release fork that operates in response to a depressing operation of a clutch pedal provided in a driver's seat of the vehicle and presses the spring to separate the clutch disk from the output shaft; The erroneous operation prevention mechanism of the mechanical friction clutch-equipped transmission including a shift fork that is connected to a shift shift lever provided in a driver seat of the vehicle and is movable between a neutral position and a shift position. The mechanism has a tapered portion at the tip and can be operated from the initial position before the clutch pedal is depressed. A male side member that moves according to the operation of the release fork and then returns to the initial position according to a return operation of the clutch pedal; and a second taper portion that is slidable on the taper portion of the male side member And when the second taper portion slides on the taper portion of the male member, the second member is coupled to the shift fork and a female member movable according to the movement of the male member. A first engaging position and a second engaging position formed on the member, and when the shift fork is in the neutral position and the male member is in the initial position, the female member and the first member The first engagement with the female-side member when the shift-fork engages immovably at one engagement position while the male-side member moves from the initial position in response to a depression operation of the clutch pedal. position And when the male member returns to the initial position in response to the return operation of the clutch pedal after the shift fork has moved to the gear position, the female member and the second member The shift fork is configured to be movably engaged at the engagement position.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 2, the male member comprises a shaft integrally formed with a pivot disposed in a pivot contact recess of the release fork, and The spring is biased toward the initial position.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 3, the male member is installed in parallel with a pivot bolt disposed in a pivot contact recess of the release fork, and the initial stage A rod that is movable toward the position according to the operation of the release fork while being biased toward the position is configured.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 4, the male member is installed in parallel with a pivot bolt disposed in a pivot contact recess of the release fork, and the initial stage The piston rod is configured to move from the initial position according to the operation of the release fork according to the supplied hydraulic pressure while being biased toward the position.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 5, the female side member is made of a plate that is movable along the wall surface of the clutch case, and the first engagement position of the engagement portion. And the second engagement position comprises a groove portion and a flat portion formed in a shift fork shaft connected to the shift fork, and the shift fork is in the neutral position and the male member is in the initial position. The shift fork is immovably engaged with the female side member at the first engagement position by the plate entering the groove, and the male side after the shift fork has moved to the shift position. When the member returns to the initial position in response to the return operation of the clutch pedal, the plate is in contact with the flat portion so that the female side member and the second engagement are And as configured movably engaged with the shift fork in location.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch mounted transmission according to claim 6, the plate of the female side member is a spring elastically mounted between a spring mounting portion formed on a wall surface of the clutch case. Thus, it is configured to be biased toward the engaging portion.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 1, a tapered portion is formed at the tip, and the release fork is actuated by depressing operation from an initial position before depressing operation of the clutch pedal. A male side member that returns to the initial position in response to the return operation of the clutch pedal, and a second taper portion that can slide on the taper portion of the male side member are formed. The first engagement position and the second engagement formed on the female member that is movable in accordance with the movement of the male member and the member that is coupled to the shift fork when the male member slides on the tapered portion of the male member. When the shift fork is in the neutral position and the male member is in the initial position, the shift fork is immovably engaged with the female member in the first engagement position, while the male member is When the shift pedal is moved from the initial position in response to the depressing operation of the shift pedal, the engagement at the first engagement position with the female side member is released, and after the shift fork has moved to the gear position, the male side member is moved to the clutch pedal. When returning to the initial position in response to the return operation, the male side member is configured to include the engagement portion that movably engages the shift fork at the second engagement position. When in the initial position before the operation, the female side member engages the shift fork immovably at the first engagement position of the engaging portion to restrain the shift fork from moving, so that the clutch pedal is not depressed. It is possible to prevent the shift to the gear position.

  Further, when the male member moves from the initial position in response to the depression operation of the clutch pedal, the engagement of the female member and the engaging portion at the first engagement position is released, and the shift fork is moved to the gear position. Since the shift fork is movably engaged with the female side member at the second engagement position when the male side member returns to the initial position in response to the return operation of the clutch pedal after the movement, the clutch operation system is In the event of an emergency such as a failure, the transmission of power can be forcibly cut off by allowing free movement of the shift lever from the shift position to the neutral position regardless of whether or not the clutch is operated.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 2, the male member is composed of a shaft formed integrally with a pivot disposed in the pivot contact recess of the release fork, and is in the initial position. In addition to the effects described above, the structure is made relatively simple by forming it integrally with the pivot as compared to the case where a wire is routed from a clutch pedal, etc. The male side member can be reliably maintained at the initial position by being configured to be biased by the spring toward the position.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 3, the male side member is installed in parallel with the pivot bolt disposed in the pivot contact recess of the release fork and is directed toward the initial position. The rod is configured to be movable from the initial position according to the operation of the release fork, so that the shift from the neutral position to the gear position when the clutch pedal is not depressed is surely prevented. In addition, in the event of an emergency such as a failure of the clutch operating system, the transmission of power can be forcibly cut off by allowing free movement of the shift lever from the shift position to the neutral position.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 4, the male side member is installed in parallel with the pivot bolt disposed in the pivot contact recess of the release fork and is directed toward the initial position. Since the piston rod is configured to move from the initial position according to the supplied hydraulic pressure while being urged by the release fork, the gear position is changed from the neutral position when the clutch pedal is not depressed. Can be reliably prevented, and in the event of an emergency such as a clutch operating system failure, the shift lever for shifting can be freely moved from the gear position to the neutral position to force transmission of power. Can be blocked.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch-equipped transmission according to claim 5, the female-side member is made of a plate that can move along the wall surface of the clutch case, and the first engagement position and the first engagement position of the engagement portion are the same. 2 The engagement position is composed of a groove portion and a flat portion formed on a shift fork shaft connected to the shift fork, and the plate enters the groove portion when the shift fork is in the neutral position and the male member is in the initial position. Thus, the shift fork is immovably engaged with the female side member at the first engagement position, and the male side member returns to the initial position in response to the return operation of the clutch pedal after the shift fork has moved to the gear position. Since the shift fork is movably engaged with the female member at the second engagement position by the plate abutting against the flat portion, the clutch pedal depressing operation is performed. Shifting to the gear position when there is no gear is more reliably prevented, and transmission of power is ensured regardless of whether the clutch is operated or not, with the free movement of the shift lever from the gear position to the neutral position. Can be forcibly shut off.

  In the mechanism for preventing erroneous operation of the mechanical friction clutch mounted transmission according to claim 6, the plate of the female side member is engaged by a spring elastically mounted between the spring mounting portion formed on the wall surface of the clutch case. In addition to the effects described above, the shift to the gear position when there is no operation of the clutch pedal can be prevented more reliably, and the shift position of the shift lever for shifting can be reduced. Free movement to the neutral position can be more reliably allowed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating an overall operation prevention mechanism of a mechanical friction clutch-mounted transmission according to a first embodiment of the present invention. It is sectional drawing which shows the structure of the real machine near the release fork of the mechanical friction clutch shown in FIG. It is sectional drawing which shows the structure of the real machine near the shift fork of the mechanical friction clutch shown in FIG. It is a schematic diagram which shows the erroneous operation prevention mechanism shown in FIG. 1 in detail. It is explanatory drawing which shows operation | movement of the misoperation prevention mechanism shown in FIG. Similarly, it is explanatory drawing which shows operation | movement of the erroneous operation prevention mechanism shown in FIG. Similarly, it is explanatory drawing which shows operation | movement of the erroneous operation prevention mechanism shown in FIG. Similarly, it is explanatory drawing which shows operation | movement of the erroneous operation prevention mechanism shown in FIG. It is a schematic diagram which shows entirely the misoperation prevention mechanism of the mechanical friction clutch mounting transmission which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows entirely the misoperation prevention mechanism of the mechanical friction clutch mounting transmission which concerns on 3rd Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment for carrying out an erroneous operation preventing mechanism of a mechanical friction clutch-mounted transmission according to the present invention will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a schematic diagram generally showing an erroneous operation preventing mechanism of a mechanical friction clutch-equipped transmission according to a first embodiment of the present invention, and FIG. 2 is a structure of an actual machine near a release fork of the mechanical friction clutch shown in FIG. FIG. 3 is a sectional view showing the structure of the actual machine near the shift fork of the mechanical friction clutch shown in FIG. 1, FIG. 4 is a schematic view showing the erroneous operation preventing mechanism shown in FIG. 1, and FIG. 8 is a schematic view showing the operation of the erroneous operation preventing mechanism shown in FIG.

  As shown in FIG. 1, the mechanical friction clutch-equipped transmission according to this embodiment includes a clutch 10, and the clutch 10 includes an output shaft (drive shaft) of an engine (drive source) mounted on the vehicle and a transmission (both illustrated). (Not shown).

  Although not shown in detail, the clutch 10 has a donut-shaped clutch disk (friction material) that can contact the output shaft of the engine, more precisely, a flywheel fixed to the output shaft. A clutch body 10a comprising a clutch plate and a pressure plate (friction material) having the same shape as the clutch disk disposed behind it, and a diaphragm spring (hereinafter referred to as “the right side in FIG. 1)” 10b).

  The clutch disk of the clutch body 10a, more specifically, the clutch disk and the pressure plate are fastened by being pressed against the flywheel (in other words, the output shaft) of the engine by the spring 10b, thereby transmitting the engine output to the transmission. .

  Reference numeral 12 denotes a release fork. The release fork 12 operates in response to a depression operation of a clutch pedal (not shown) provided in the driver's seat of the vehicle. More specifically, the release fork 12 operates in accordance with the operation of the slave cylinder 14 in response to the depression operation of the clutch pedal. The clutch disc of the clutch body 10a is pressed away from the output shaft, more specifically, the flywheel of the engine, and returned to the original position in response to the return operation of the clutch pedal.

  Reference numeral 20 denotes a shift fork. The shift fork 20 is connected to a shift lever (not shown) provided in the driver's seat of the vehicle, and operates the shift lever for the driver, more specifically, a neutral position and a forward n (n ≧ 2) stage. It is configured to be movable in accordance with the operation of a shift lever for shifting that shifts between shift positions consisting of one reverse speed. In FIG. 1, the arrows indicate the movements during clutch operation prior to that.

  As described above, the mechanical friction clutch-equipped transmission according to this embodiment includes the clutch 10 including at least the clutch body 10a and the spring 10b, the release fork 12, and the shift fork 20, and an erroneous operation prevention mechanism (reference numeral 22). Provided). The erroneous operation preventing mechanism 22 includes a male side member 24, a female side member 26, and an engaging portion 30.

  The male member 24 is inserted into the hole 32a formed in the clutch case (wall) 32 from the release fork 12 side so as to be movable by a small stroke. After the movement of the release fork 12 by the depression operation from the initial position before the depression of the clutch pedal on the clutch 10 side in the minute stroke of the hole 32a to the opposite side of the release fork 12, the clutch pedal is moved. It consists of a shaft that returns to its initial position in response to a return operation.

  More specifically, it comprises a shaft (hereinafter referred to as “pivot shaft”) integrally formed with the pivot 12b disposed in the pivot contact recess 12a of the release fork 12.

  That is, the pivot contact recess 12a has a hemispherical cross section as shown in the figure, and the pivot 12b is connected to a head 12b1 and a head 12b1 having a hemisphere corresponding to the pivot contact recess 12a formed in the release fork 12. A base 12b2 is provided, and the head 12b1 is disposed so as to be accommodated in the pivot contact recess 12a.

  The pivot shaft (male side member) 24 is formed of a shaft body integrally formed with the base body 12b2 of the pivot 12b and having a tapered portion 24a formed at the tip. In the pivot shaft 24, the taper portion 24a is configured to reduce in diameter toward the most distal end (point).

  The pivot shaft 24 is formed with a large diameter portion 24b in the vicinity of the pivot 12b connected to the base body 12b2, and a spring 24c is mounted between the large diameter portion 24b and the clutch case 32.

  The spring 24c is made of a disc spring, and its central hole is inserted into the pivot shaft 24, and its edge is disposed in contact with the open end of the hole 32a formed in the clutch case 32, so that the pivot shaft 24 is placed in the release fork. It is comprised so that it may bias toward 12 side.

  As shown in FIG. 4, a snap ring 24d is attached to the tip end side of the pivot 12b opposite to the head 12b1 with the clutch case 32 of the pivot shaft 24 interposed therebetween to prevent the pivot shaft 24 from coming off. Further, an oil seal 24e is mounted between the inner surface of the hole 32a and the pivot shaft 24 to prevent the lubricating oil in the transmission from leaking to the outside (clutch chamber), and the hole 32a of the pivot shaft 24. Smooth movement in

  The female member 26 is composed of a plate (hereinafter referred to as “lock plate”). The lock plate 26 is formed with a large-diameter circular hole for insertion of the pivot shaft 24 in the vicinity of the center, and a second taper that can slide on the tapered portion 24a of the pivot shaft 24 in the formed circular hole. A portion 26 a is formed, and the second tapered portion 26 a is configured to be movable according to the movement of the pivot shaft 24 when sliding on the tapered portion 24 a of the pivot shaft 24.

  The second tapered portion 26a formed in the circular hole in the lock plate (female side member) 26 has a diameter reduced from the open end side (clutch case 32 side) to the back side corresponding to the tapered portion 24a of the pivot shaft 24. Therefore, when the second taper portion 26a slides on the taper portion 24a of the pivot shaft 24, the direction perpendicular to the axial direction of the pivot shaft 24 (FIGS. 1 and 4) corresponds to the movement of the pivot shaft 24. It is configured to be movable in the vertical direction). As shown in FIG. 4, the lock plate 26 is slidably mounted in a holder 28 fixed to the clutch case 32.

  The engaging part 30 has a groove part (first engaging position) 30 a and a flat part (second engaging position) 30 b formed at one end (free end) of the shift fork shaft 34 connected to the shift fork 20.

  When the pivot shaft (male side member) 24 is in the initial position, the engagement portion 30 engages the shift fork 20 so as not to move at the lock plate (female side member) 26 and the first engagement position (groove portion) 30a. When the pivot shaft 24 moves from the initial position in conjunction with the clutch operation when the shift fork 20 moves toward the gear position, the engagement with the lock plate 26 at the first engagement position 30a is released. At the same time, when the pivot shaft 24 returns to the initial position in response to the return operation of the clutch pedal after the shift fork 20 has moved to the gear position, the shift fork 20 is moved between the lock plate 26 and the second engagement position (flat portion) 30b. Are configured to be movably engaged.

  One end (lower side in the figure) of the lock plate 26 is formed so as to be able to engage (enter) the groove 30a. That is, the lock plate 26 is formed on the clutch case 32, and more specifically, the spring 26b is elastically mounted between the lock plate 26 and the spring mounting portion 32b formed on the transmission-side wall opposite to the clutch 10, and the groove ( The first engagement position) 30a and the flat portion (second engagement position) 30b are biased.

  Next, the operation of the erroneous operation preventing mechanism 22 will be described with reference to FIGS.

  FIG. 5 is an explanatory diagram showing the operation of the erroneous operation preventing mechanism 22 when the shift fork 20 is in the neutral position and the clutch pedal is not depressed, and FIG. 6 is an illustration of the operation error prevention mechanism 22 when the clutch pedal is depressed.

  As shown in FIG. 5, when the shift fork 20 is in the neutral position and the pivot shaft 24 is in the initial position before the depression of the clutch pedal, the tip of the lock plate 26 enters and engages with the groove 30a. Therefore, the shift fork shaft 34 and the shift fork 20 connected to the shift fork shaft 34 are made immovable (locked), so that the shift to the gear position is prevented.

  When the clutch pedal is depressed from this state, as shown in FIG. 6, the pivot shaft 24 (more specifically, the taper portion 24a) moves from the initial position in accordance with the operation of the release fork 12, so that the lock plate 26 Since the second taper portion 26a slides on the taper portion 24a of the pivot shaft 24 and the lock plate 26 moves upward on the paper surface against the spring force of the spring 26b, the tip of the lock plate 26 and the groove portion 30a And the shift fork shaft 34 and the shift fork 20 connected to the shift fork shaft 34 are also unlocked, thereby enabling a shift to a desired gear position.

  Next, after the shift-in (end of shifting), that is, after the shift fork 20 moves to the shift position, when the clutch pedal is returned, the pivot shaft 24 is moved toward the pivot contact recess 12a of the release fork 12 by the spring 24c. As a result of being urged, the lock plate 26 moves backward as shown in FIG. 7, so that the front end of the lock plate 26 comes off the groove 30a and comes into contact with the flat portion 30b of the shift fork shaft 34. The shift fork 20 is movably engaged.

  Therefore, regardless of whether or not the clutch pedal is depressed, the shift lever for shifting (in other words, the shift fork 20) can be operated to forcibly return the gear position to the neutral position. This is particularly beneficial because it is possible to forcibly cut off the transmission of power by returning the shift lever to the neutral position from the gear position in an emergency such as failure of the clutch operation system.

  When the shift lever for shifting is operated without the clutch pedal being depressed, the front end of the lock plate 26 engages with the groove 30a as shown in FIG. The initial state (the state shown in FIG. 5) is restored.

  Since this embodiment is configured as described above, when the shift fork 20 is in the neutral position and the pivot shaft (male side member) 24 is in the initial position before the clutch pedal depression operation, the lock plate (female side member) 26 is provided. By engaging the groove portion (first engagement position) 30a and the shift fork 20 so as not to move, it is possible to prevent shifting to the gear position when the clutch pedal is not depressed.

  When the shift fork 20 is in the neutral position and the pivot shaft 24 moves from the initial position in response to the depression of the clutch pedal, the engagement between the lock plate 26 and the groove 30a is released, and the shift fork 20 When returning to the initial position in response to the return operation of the clutch pedal after moving to the shift position, the lock operating plate 26 movably engages the flat portion 30b and the shift fork 20 so that the clutch operating system breaks down. In the event of an emergency, it is possible to forcibly cut off the transmission of power by allowing free movement of the shift lever from the shift position to the neutral position regardless of whether or not the clutch is operated.

  Further, since the pivot shaft 24 is formed of a shaft integrally formed with the pivot 12b disposed in the pivot contact recess 12a of the release fork 12, and is configured to be movable from the initial position according to the operation thereof, the above-described effect is achieved. In addition, as compared with the case where a wire cable is routed from a clutch pedal or the like, the structure is relatively simple by being integrally formed with the pivot 12b, and an erroneous operation preventing mechanism 22 is configured as shown in FIGS. It is easy to attach to the actual machine by adding a few parts.

(Second Embodiment)
FIG. 9 is a schematic view similar to FIG. 1, schematically showing an erroneous operation preventing mechanism of a mechanical friction clutch-mounted transmission according to the second embodiment of the present invention.

  Focusing on the differences from the first embodiment, in the second embodiment, the male side member is disposed in the pivot contact recess 12a of the release fork 12 and is fixed to the pivot bolt 13 by screws. A push rod (rod) 40 that is installed in parallel and is movable from an initial position in accordance with the operation of the release fork 12 is configured.

  The pivot bolt 13 has a shape similar to the pivot 12b of the first embodiment, the head 13a is disposed in the pivot contact recess 12a of the release fork 12, and the base 13b is screwed to the clutch case 32. It exhibits the shape of

  The push rod 40 has a shape similar to that of the pivot shaft 24 of the first embodiment, and is composed of a rod body inserted from the clutch 10 side into a hole 32 a formed in the clutch case 32, and is released in parallel with the pivot bolt 13. It is configured to be movable from the initial position toward the transmission side according to the operation of the fork 12.

  As shown in the figure, the push rod 40 is formed with a hemispherical head 40a disposed so as to contact the release fork 12 at a position spaced from the pivot contact recess 12a of the release fork 12, and a tapered portion 40b formed from the head 40a. The shaft portion 40c extends toward the tip, and the large-diameter portion 40d is formed between the head portion 40a and the shaft portion 40c.

  In the push rod 40, a spring 40e is attached to the large-diameter portion 40d and is configured to be biased toward the initial position, as in the first embodiment. The structure of the lock plate 26 and the engaging portion 30 is the same as that of the first embodiment.

  Since the second embodiment is configured as described above, when the shift fork 20 is in the neutral position and the push rod (male member) 40 is in the initial position before the clutch pedal is depressed, the lock plate (female member) ) 26 engages the groove (first engagement position) 30a and the shift fork 20 so that the shift fork 20 cannot move, thereby preventing shifting to the gear position when the clutch pedal is not depressed.

  Further, when the shift fork 20 is in the neutral position, when the push rod 40 moves from the initial position in response to the depression of the clutch pedal, the engagement between the lock plate 26 and the groove 30a is released, and the shift fork The lock plate 26 movably engages the flat portion (second engagement position) 30b and the shift fork 20 when the lock plate 26 returns to the initial position in response to the clutch pedal return operation after the gear 20 has moved to the gear position. In the event of an emergency such as a malfunction of the clutch operating system, the transmission shift lever is allowed to move freely from the gear position to the neutral position regardless of whether or not the clutch is operated, and the transmission of driving force is forcibly cut off. be able to. The remaining configuration and effects are not different from those of the first embodiment.

(Third embodiment)
FIG. 10 is a schematic view similar to FIG. 1, schematically showing an erroneous operation preventing mechanism of a mechanical friction clutch-mounted transmission according to a third embodiment of the present invention.

  A description will be given focusing on differences from the first and second embodiments. In the third embodiment, the male side member is disposed in the pivot contact recess 12a of the release fork 12 and is pivotally fixed by screws. The piston rod 50 is provided in parallel with the bolt 13.

  The piston rod 50 is connected to a piston 50b that is slidably accommodated in the cylinder 50a, and is formed of a rod having a tapered portion 50c formed on the tip side. The piston rod 50 is pushed out of the cylinder 50a in response to a depression operation of the clutch pedal. It is configured to be movable from the initial position in accordance with the hydraulic pressure supplied to. The piston rod 50 is biased toward the initial position by the spring 50d.

  In accordance with the operation of the clutch pedal, the hydraulic pressure is supplied from the slave cylinder 14 that is interlocked with the operation of the clutch pedal to the push side of the cylinder 50a through the branch oil passage 52. The structures of the lock plate 26, the groove 30a of the engaging portion 30 and the flat portion 30b are not different from those of the first embodiment.

  Since the third embodiment is configured as described above, when the shift fork 20 is in the neutral position and the piston rod (male side member) 50 is in the initial position before the depression of the clutch pedal, the lock plate (female side member) ) 26 engages the groove (first engagement position) 30a and the shift fork 20 so that the shift fork 20 cannot move, thereby preventing shifting to the gear position when the clutch pedal is not depressed.

  Further, when the piston rod 50 moves from the initial position, the engagement between the lock plate 26 and the groove portion 30a is released, and after the shift fork 20 has moved to the gear position, the initial position according to the return operation of the clutch pedal. When returning to, the shift plate shifts the shift lever even in an emergency such as failure of the clutch operation system by the lock plate 6 movably engaging the flat portion (second engagement position) 30b and the shift fork 20. Transmission of power can be forcibly interrupted by allowing free movement regardless of whether or not the clutch is operated from the step position to the neutral position. The remaining configuration and effects are not different from those of the first embodiment.

  As described above, in the first to third embodiments, the drive shaft is inserted between the output shaft of the drive source mounted on the vehicle and the transmission, and is pressed against the output shaft by the spring 10b to A clutch disk (clutch main body 10a) for transmitting output to the transmission and an operation according to a depression operation of a clutch pedal provided at a driver's seat of the vehicle to press the spring 10b to cause the clutch disk to move to the output shaft Of a mechanical friction clutch-equipped transmission comprising a release fork 12 separated from a shift fork 20 and a shift fork 20 connected to a shift lever provided in a driver's seat of the vehicle and movable between a neutral position and a shift position. In the erroneous operation prevention mechanism 22, when the erroneous operation prevention mechanism 22 is formed with tapered portions 24a, 40b, and 50c at the tip thereof. Further, it is inserted into a hole 32a formed in the clutch case 32 and can be moved by a minute stroke, and more specifically from an initial position before the clutch pedal is depressed, more specifically from an initial position that is the most clutch side position in the minute stroke. After moving according to the operation of the release fork by the depression operation, more specifically, after moving to the opposite side to the initial position in the minute stroke, the male side returning to the initial position according to the return operation of the clutch pedal A member (pivot shaft 24, rod (push rod) 40, piston rod 50) and a second taper portion 26a slidable on the taper portion of the male member are formed, and the second taper portion is When sliding on the taper portion of the male side member, a female side member (lock) that can move according to the movement of the male side member. Plate) 26, and a first engagement position 30a and a second engagement position 30b formed on a member (shift fork shaft) 34 connected to the shift fork 20, and the shift fork 20 is in the neutral position. When the male member is in the initial position, the shift fork 20 is immovably engaged with the female member at the first engagement position, while the male member depresses the clutch pedal. When moving from the initial position according to operation, the male side member is released after the shift fork is moved to the gear position, and the engagement at the first engagement position with the female side member is released. An engagement portion 3 that movably engages the shift fork 20 at the second engagement position with the female side member when returning to the initial position in response to a return operation of the clutch pedal. Therefore, when the male member 24, 40, 50 is in the initial position before the clutch pedal is depressed, the female member moves the shift fork 20 at the first engagement position 30a of the engagement portion. By engaging the shift fork 20 so as not to move, it is possible to prevent shifting to the gear position when the clutch pedal is not depressed.

  Further, when the shift fork 20 is in the neutral position, when the male side member moves from the initial position in response to the depression operation of the clutch pedal, the female side member and the engagement portion 30 are engaged at the first engagement position 30a. When the male member returns to the initial position in response to the return operation of the clutch pedal after the shift fork 20 has moved to the gear position, the shift fork 20 is moved at the second engagement position 30b with the female member. Since it is configured so that it can be moved, it allows free movement of the shift lever from the shift position to the neutral position regardless of whether or not the clutch is operated, even in the event of a failure of the clutch operating system. Power transmission can be forcibly cut off.

  Further, the male side member includes a shaft (pivot shaft) 24 integrally formed with a pivot 12b disposed in the pivot contact recess 12a of the release fork 12, and is biased by a spring 24c toward an initial position. Since the structure is relatively simple as compared with the case where a wire or the like is routed from a clutch pedal or the like, the structure is relatively simple and the springs 24c, 40e and 50d are biased toward the initial position. By configuring as described, the male member can be reliably maintained at the initial position.

  Further, the male side member is installed in parallel with the pivot bolt 13 disposed in the pivot contact recess 12a of the release fork 12, more specifically, inserted into a hole 32a formed in the clutch case 32 and installed in parallel. In addition, since it is configured to include a rod (push rod) 40 that is urged toward the initial position and is movable from the initial position in accordance with the operation of the release fork 12, similarly, the clutch pedal is depressed. Shift from the neutral position to the gear position when there is no operation can be reliably prevented, and the shift lever for shifting can be freely moved from the gear position to the neutral position even in the event of a failure of the clutch operating system. Can be forcibly interrupted transmission of power.

  Further, the male side member is installed in parallel with the pivot bolt 13 disposed in the pivot contact recess 12a of the release fork 12, more specifically, inserted into a hole 32a formed in the clutch case 32 and installed in parallel. In addition, since the piston rod 50 is configured to be moved from the initial position according to the supplied hydraulic pressure while being biased toward the initial position, similarly, when the clutch pedal is not depressed. Shifting from the neutral position to the gear position can be reliably prevented, and the shift lever can be moved freely from the gear position to the neutral position in the event of an emergency such as a clutch operation system failure. Can be forcibly cut off.

  The female member (lock plate) 26 includes a lock plate 26 that can move along the wall surface of the clutch case 32, and the first engagement position 30a and the second engagement position 30b of the engagement portion are shifted. When the shift fork 20 is in the neutral position and the male member is in the initial position, the lock plate 26 is formed of a groove portion and a flat portion formed in the shift fork shaft 34 connected to the fork 20. By entering the groove 30a, the shift fork 20 is immovably engaged with the female side member at the first engagement position, and after the shift fork 20 has moved to the shift position, the male side member. Is returned to the initial position in response to the return operation of the clutch pedal, the lock plate 26 comes into contact with the flat portion 30b. As a result, the shift fork 20 is movably engaged with the female member at the second engagement position, so that, in addition to the above-described effects, shifting from the neutral position when the clutch pedal is not depressed is performed. It is possible to reliably prevent shifting to the gear stage, and to forcibly block power transmission by reliably allowing the shift lever for shifting from the gear position to the neutral position regardless of whether or not the clutch is operated. be able to.

  The female member plate (lock plate) 26 is attached to the engaging portion 30 by a spring 26b elastically mounted between the clutch case 32, more specifically, a spring mounting portion 32b formed on the wall surface thereof. In addition to the effects described above, shifting to a gear position when there is no clutch pedal operation can be prevented more reliably, and a shift lever for shifting regardless of whether or not the clutch is operated. The transmission of power can be forcibly interrupted by reliably providing free movement from the gear position to the neutral position.

10 Clutch, 10a Clutch body, 10b Spring, 12 Release fork, 12a Pivot contact recess, 12b Pivot, 12b1 Head, 12b2 Base, 13 Pivot bolt, 13a Head, 13b Base, 14 Slave cylinder, 16 Release bearing, 20 Shift Fork, 22 Misoperation prevention mechanism, 24 shaft (male side member), 24a taper portion, 24b large diameter portion, 24c spring, 24d snap ring, 24e oil seal, 26 lock plate (female side member), 26a second taper portion , 26b Spring, 30 Engagement part 30a First engagement position (groove part), 30b Second engagement position (flat part), 32 Clutch case, 32a Hole part, 32b Spring mounting part, 34 Shift fork shaft, 40 Push rod (Male side member), 40a head, 40b Taper part, 40c shaft part, 40d large diameter part, 40e spring, 50 (male side member), 50a cylinder, 50b piston, 50c taper part, 50d spring, 52 oil passage

Claims (6)

  A clutch disk that is inserted between an output shaft of a drive source mounted on the vehicle and the transmission and is pressed against the output shaft by a spring to transmit the output of the drive source to the transmission; and a driver's seat of the vehicle Connected to a release fork that presses the spring to move the clutch disc away from the output shaft and a shift shift lever provided in the driver's seat of the vehicle. In the mechanism for preventing erroneous operation of a mechanical friction clutch-equipped transmission comprising a shift fork movable between a neutral position and a gear position, the erroneous operation preventing mechanism is formed with a tapered portion at the tip, and the clutch pedal After moving according to the operation of the release fork by the stepping operation from the initial position before the stepping operation, A male side member that returns to the initial position in response to the return operation of the clutch pedal, a second taper portion that can slide on the taper portion of the male side member, and the second taper portion When sliding on the taper portion of the male side member, a female side member that is movable in accordance with the movement of the male side member, a first engagement position formed on a member connected to the shift fork, and a second And when the shift fork is in the neutral position and the male member is in the initial position, the shift fork is engaged with the female member in the first engagement position. On the other hand, when the male member moves from the initial position in response to the depression operation of the clutch pedal, the engagement with the female member at the first engagement position is released, and the shift fork Said When the male member returns to the initial position in response to the return operation of the clutch pedal after moving to the gear position, the shift fork is movably engaged with the female member at the second engagement position. A mechanism for preventing erroneous operation of a mechanical friction clutch-mounted transmission, characterized by comprising an engaging portion.   The male side member comprises a shaft integrally formed with a pivot disposed in a pivot contact recess of the release fork, and is biased by a spring toward the initial position. Mechanism for preventing erroneous operation of transmissions equipped with mechanical friction clutches.   In response to the operation of the release fork from the initial position, the male side member is installed in parallel with a pivot bolt disposed in the pivot contact recess of the release fork and is urged toward the initial position. The mechanism for preventing an erroneous operation of a mechanical friction clutch-mounted transmission according to claim 1, wherein the mechanism is a movable rod.   The male side member is installed in parallel with a pivot bolt disposed in the pivot contact recess of the release fork, and is biased toward the initial position, and from the initial position according to the supplied hydraulic pressure. 2. The mechanism for preventing erroneous operation of a mechanical friction clutch-mounted transmission according to claim 1, wherein the mechanism comprises a piston rod movable in accordance with the operation of the release fork.   The female member is a plate that is movable along the wall surface of the clutch case, and a first engagement position and a second engagement position of the engagement portion are formed on a shift fork shaft that is coupled to the shift fork. The plate includes a groove portion and a flat portion, and when the shift fork is in the neutral position and the male side member is in the initial position, the plate enters into the groove portion to cause the female side member and the first engagement. When the shift fork engages immovably at a position, and the male member returns to the initial position in response to a return operation of the clutch pedal after the shift fork has moved to the gear position, the plate 2. The shift fork is movably engaged with the female member at the second engagement position by abutting the flat portion. 4 of erroneous operation prevention mechanism of a mechanical friction clutch mounted transmission according to any one. 6. The machine according to claim 5, wherein the plate of the female member is biased toward the engagement portion by a spring elastically mounted between the plate of the female member and a spring mounting portion formed in the clutch case. Mechanism for preventing erroneous operation of a transmission equipped with a friction clutch.

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