JP2007192353A - Shift operation mechanism of transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shift operation mechanism of a transmission capable of compactly constituting the transmission, by preventing an enlargement of the transmission, while maximally enhancing detecting accuracy of a shift switch, when arranging the shift switch, in the shift operation mechanism of the transmission. <P>SOLUTION: An extension part 35a extending to the transmission front side more than a support part 23 of a clutch housing 2, is arranged in a front end part of a control rod 35. A neutral switch 50 detecting a neutral state is arranged in a storage recessed part 24 formed in the clutch housing 2 corresponding to its extension part 35a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transmission operation mechanism for a transmission, and in particular, includes a clutch housing and a transmission case connected to the clutch housing, and a shift fork that switches the transmission mechanism, and a transmission operation of a driver is transmitted to the shift fork. The present invention relates to a shift operation mechanism of a transmission including a control rod.

  2. Description of the Related Art Conventionally, it is known to install a shift switch (for example, a neutral switch) that detects a shift state of a transmission for use in engine control or the like even in a transmission such as a manual transmission.

  For example, Patent Document 1 below also includes a shift switch that detects the shift state of the transmission by detecting the movement of the shift operation mechanism that transmits the shift operation of the driver to the transmission mechanism.

  Specifically, as shown in FIG. 3 of Patent Document 1, in the speed change operation mechanism of the transmission 1, the proximity of the guide rod 201 is detected so as to detect the movement of the guide rod 201 engaged with the guide plate 205. A shift switch 208 is installed in the case.

  Thereby, the movement of the guide rod 201 moving in the axial direction or rotating in the circumferential direction in accordance with the shift operation of the driver is detected by the shift switch, and the shift state of the transmission is detected.

Japanese Patent Laid-Open No. 2003-14115

  By the way, the transmission has been multi-staged for the purpose of improving the drive feeling in recent years. For example, the transmission of Patent Document 1 described above also has six forward speeds and one reverse speed. .

  As described above, when the number of transmissions is increased, the size of the transmission inevitably increases, and the transmission may not be accommodated in the conventional accommodation space. Especially when it is housed in the engine room at the front of the vehicle, it is necessary to secure a crash space in the event of a vehicle collision, and the space in the vehicle width direction is also limited. Is required to be configured.

  In this regard, in the case of the transmission of Patent Document 1 described above, the guide rod 201 that is not directly related to the transmission path of the speed change operation mechanism is installed. Was. Thus, it is conceivable to eliminate the guide rod and to make the transmission as compact as possible.

  However, in this case, a new problem arises as to where the shift switch provided on the guide rod is arranged.

  Generally, a shift switch generally needs to detect a shift state of a transmission as quickly and accurately as possible. Therefore, a member that can directly detect the movement of a transmission mechanism is preferably a detected member. Therefore, for example, a control rod that transmits a shift operation to the shift fork may be a detected member.

  However, since a member such as a plurality of shift forks is linked to the control rod in the transmission case, it is difficult to install the shift switch in the transmission case close to the control rod.

  Also, it is conceivable to extend the control rod to the end cover side and use the extended part to contact the shift switch, but the control rod is arranged in parallel with the main shaft of the transmission, etc. When the control rod is simply extended to the end cover side, there arises a problem that the transmission is enlarged in the longitudinal direction.

  Therefore, according to the present invention, in installing the shift switch in the transmission operation mechanism of the transmission, it is possible to make the transmission compact while preventing the enlargement of the transmission while increasing the detection accuracy of the shift switch as much as possible. It is an object of the present invention to provide a speed change operation mechanism for a transmission.

  A transmission operation mechanism of a transmission according to the present invention is connected to a cylinder block of an engine, and includes a clutch housing that houses a clutch device that connects and disconnects an output shaft of the engine and an input shaft of the transmission, and is connected to the clutch housing. A transmission case, a shift fork for switching the transmission mechanism, and a control rod for transmitting a shift operation of a driver to the shift fork, wherein the clutch housing A control rod support portion that supports the control rod, an extension portion that is formed on the control rod and extends in the clutch housing side direction beyond the control rod support portion, and the extension portion of the clutch housing. The control rod is placed at a position corresponding to Detected and is obtained by a speed change switch for detecting the speed state of the transmission.

According to the above configuration, the shift switch detects the operation of the control rod in the extended portion of the control rod beyond the control rod support portion of the clutch housing, and detects the shift state of the transmission.
For this reason, the operation of the control rod can be detected by the extended portion extending to the clutch housing side without extending the control rod to the end cover side.
Thus, by extending the control rod on the clutch housing side and detecting the shift state with the shift switch, the shift switch can be arranged by effectively using the dead space in the outer portion of the clutch device, and the transmission Increase in size can be prevented.
Here, the “shift switch” is not limited to a neutral switch that detects the neutral state of the transmission, but may be a shift stage switch that detects the shift stage of the transmission, or a reverse switch that detects the reverse stage. .

In one embodiment of the present invention, a bag-shaped recess formed in the clutch housing and configured to receive the control rod support portion and the extension portion of the control rod, and the control rod support portion and the control rod And a bush provided between them.
According to the above configuration, the extending portion of the control rod is located in the sealed space that is isolated from the gear space in the transmission case by the bag-shaped recess and the bush, The machine case mission oil is less likely to adhere.
For this reason, it is difficult for the mission oil to flow into the speed change switch that contacts the extended portion of the control rod.
Therefore, iron powder or the like contained in the mission oil is less likely to be mixed into the transmission switch, so that a failure due to so-called contamination (clogging) can be prevented, and the reliability of the transmission switch can be improved.

In one embodiment of the present invention, a cam portion formed on the extending portion of the control rod and having a concavo-convex surface in the axial direction of the control rod, and a convex shape provided on the shift switch and contacting the cam portion And a sensing unit.
According to the above configuration, even if the structure for detecting the shift signal of the speed change switch is configured by the cam portion and the convex sensing portion on the uneven surface of the extension portion, the extension portion is located in the sealed space. Therefore, there is no possibility that the iron powder contained in the mission oil is sandwiched between the cam portion having the uneven surface and the convex sensing portion.
Therefore, the detection accuracy by the detection structure constituted by the cam portion having the uneven surface and the convex sensing portion can be increased more stably.

In one embodiment of the present invention, a detent load characteristic setting unit installed on the control rod so as to have an uneven surface in the axial direction of the control rod, and the detent load characteristic setting installed in the clutch housing. And a detent mechanism having a detent member that is pressed and urged so as to always contact the portion.
According to the above configuration, the detent load characteristic setting unit for applying the detent load is provided on the control rod, so that the position of the control rod when performing the shift operation is more reliably defined, and the detent mechanism is shifted. By providing it in the same clutch casing as the switch, there is no relative displacement between the shift switch and the detent mechanism.
Therefore, the operation of the control rod can be detected with higher accuracy, and the detection accuracy of the shift switch can be further increased.

In one embodiment of the present invention, the detent load characteristic setting portion is installed adjacent to the extending portion of the control rod.
According to the above configuration, since the extended portion that is the detection position of the speed change switch and the detent load characteristic setting portion are adjacent to each other, the speed change switch is not affected by the secular change, elastic deformation, thermal deformation, etc. of the control rod itself. The operation of the control rod can be detected without receiving it.
Therefore, the shift switch can detect the operating position of the control rod more accurately and accurately.

In one embodiment of the present invention, the shift switch is installed in a housing recess formed on the outer surface of the clutch housing.
According to the above configuration, since the speed change switch is installed in the housing recess of the clutch housing, the speed change switch may protrude largely outward from the outer surface of the transmission with the speed change switch mounted on the transmission. Absent.
For this reason, the speed change switch is protected by the clutch housing at the periphery of the accommodating recess, and the possibility of dropping or damage can be prevented as much as possible.
Therefore, the durability and reliability of the shift switch can be improved.

  In one embodiment of the present invention, a mounting bolt for mounting the clutch housing to the cylinder block of the engine is provided, and the mounting position of the shift switch is fastened with the shift switch mounted on the clutch housing. It is set at a site that does not interfere with the jig.

According to the above configuration, when the clutch casing is attached to the cylinder block of the engine with the speed change switch mounted on the transmission, the fastening bolt of the mounting bolt does not interfere with the speed change switch. Adhesiveness can be improved.
That is, when the transmission is assembled to the engine, the shift switch is mounted on the transmission in advance (subassembly), and the assembly is performed. Since the fastening directions are orthogonal to each other, there is a possibility of interference with the fastening jig of the mounting bolt. By setting the installation position at a site where this does not interfere, the assembling property of the transmission to the engine is improved.
Therefore, even in a state in which the shift switch is mounted on the transmission in advance, the transmission can be assembled to the engine, and the assembly of the transmission can be improved.

In an embodiment of the present invention, the installation angle of the shift switch is inclined in the tangential direction of the outer surface of the clutch housing.
According to the above configuration, the installation angle of the shift switch is inclined, so that the harness extending from the shift switch can be disposed along the outer surface of the clutch housing without being largely bent.
Therefore, the amount of protrusion of the shift switch harness from the outer surface of the clutch housing can be suppressed as much as possible without greatly bending the harness, and the transmission can be configured compactly without applying a load to the harness. it can.

According to the present invention, the operation of the control rod can be detected by the extended portion extending to the clutch housing side without extending the control rod to the end cover side.
Therefore, by extending the control rod on the clutch housing side and detecting the shift state with the shift switch, the shift switch can be arranged by effectively using the dead space in the outer part of the clutch device. Can be prevented.
Therefore, in installing the transmission switch in the transmission operation mechanism of the transmission, it is possible to increase the detection accuracy of the transmission switch and prevent the transmission from becoming large and to make the transmission compact.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the first embodiment will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view of a transmission employing the speed change operation mechanism of the present invention, FIG. 2 is a rear view of the main part around the speed change operation mechanism as seen through the transmission from the rear side, and FIG. 4 is a detailed view of the main part of FIG. 3, FIG. 5 is a cross-sectional view taken along the line BB of FIG. 3, and FIG. 6 is a diagram illustrating how the harness is routed when the transmission is mounted on the vehicle. FIG. 7 is a bottom view of the neutral switch mounted state as viewed from below the transmission. In the following description, the engine fastening side of the transmission will be described as the front of the transmission, and the engine non-fastening side will be described as the rear of the transmission.

  As shown in FIG. 1, the transmission 1 according to this embodiment includes a clutch housing 2 that is positioned on the front side of the transmission and is fastened and fixed to the cylinder block E of the engine, and a clutch housing 2 that is positioned and fixed to the clutch housing 2. A transmission casing 10 including three case housings 2, 3, and 4 including a transmission case 3 and an end cover 4 that is positioned on the rear side of the transmission and fastened and fixed to the transmission case 3. Yes.

  The clutch housing 2 has a substantially cone-shaped clutch housing portion 21 that houses a clutch device 5 that is connected to a flywheel F fixed to the output shaft of the engine and transmits engine output, and a drive shaft. A differential housing portion 22 for housing the differential device 6 disposed on the axis D is formed, and the clutch device 5 and the differential device 6 are housed in the respective housing portions 21 and 22.

  The aforementioned mission case 3 is formed in a substantially cylindrical shape, and accommodates therein a primary shaft 7, a secondary shaft 8, and a reverse idle shaft (not shown in FIG. 1). A plurality of installed transmission gears, synchronizers and the like (specifically not shown) are also accommodated.

  The above-described end cover 4 is formed in a substantially bottomed cylindrical shape, and accommodates the rear end portions of the primary shaft 7 and the secondary shaft 8 inside thereof, and accommodates relatively high speed stages (for example, the 5th speed stage and the 6th speed stage). (Speed stage) transmission gear, synchronizer, etc. are accommodated.

The shafts 7, 8 and the like are arranged in parallel from the front to the rear of the transmission 1, and are pivotally supported by the case housings 2, 3, 4 via bearings. Yes.
First, the primary shaft 7 is pivotally supported by a bearing bearing 11 having a front portion installed in the clutch housing 2, a bearing portion 12 having a central portion installed in the transmission case 3, and a bearing bearing 13 having a rear end portion installed in the end cover 4. Are supported by each.

  Further, the secondary shaft 8 also has a shaft bearing 14 having a front portion installed in the clutch housing 2, a bearing bearing 15 having a central portion installed in the transmission case 3, and a bearing bearing 16 having a rear end portion installed in the end cover 4. It is supported.

  On the other hand, the differential device 6 is pivotally supported by a bearing bearing 17 installed at the front end portion of the differential housing 6 and supported by a bearing bearing 18 installed at the rear end portion of the transmission case 3.

  As shown in FIG. 2, the speed change mechanism 30 of the present embodiment includes a select lever 31 and a shift lever 32 to which the movement of a change operation lever (not shown) operated by a driver is transmitted, and the transmission casing 10. A plurality of shift forks 36, 37, for moving a first rod 33 and a second rod 34 arranged inside, a control rod 35 arranged in parallel with the primary shaft 7, and a synchronizer (not shown); 38 (see FIG. 5).

  The above-mentioned select lever 31 is rotatably supported by a bracket 39 installed outside the transmission casing 10, and one end of the select cable 31a is attached to one end of the select lever 31, and other than the select cable 31a. A change operation lever (not shown) is connected to the end. The shift lever 32 is connected to the other end of the select lever 31.

  The shift lever 32 is fixed to the upper end of the first rod 33 protruding outside the transmission casing 10 with a pin. The first rod 33 is supported by the transmission casing 10 so as to freely move in the axial direction and rotate around the axis. Thereby, the first rod 33 operates integrally with the shift lever 32. Further, one end of a shift cable 32a is connected to the shift lever 32, and a change operation lever (not shown) is connected to the other end of the shift cable 32a.

  With this configuration, when the driver selects a change operation lever (not shown), the select lever 31 swings in the S1-S1 'direction via the select cable 31a. The first rod 33 moves through the shift lever 32 in the axial direction, that is, in the S2-S2 'direction. When the driver shifts the change operation lever, the shift lever 32 connected to the shift cable 32a rotates in the T1-T1 'direction, and the first rod 33 rotates in the T2-T2' direction around the axis. It will turn.

  As shown in FIGS. 2 and 3, a first lever 41 is fixed to the lower portion of the first rod 33. The first lever 41 extends in the direction of the second rod 34 while being bent and is provided with a pin 40 at a bifurcated tip. ing. The first lever 41 is configured to move or rotate integrally when the first rod 33 moves in the axial direction or rotates around the axis.

  The lower end of the second rod 34 is fixed to the transmission casing 10 with a pin. Further, the second rod 34 extends in the direction of the first lever 41 and moves the second lever 42 having a bifurcated tip portion rotatably engaged with the pin 40 of the first lever 41 in the axial direction. It is supported so that it can rotate around its axis.

  Therefore, when the first lever 41 swings in the T2-T2 ′ direction around the first rod 33, the second lever 42 swings in the T3-T3 ′ direction around the second rod 34. When the first lever 41 moves in the axial direction, that is, the S2-S2 'direction, the second lever 42 moves in the axial direction of the second rod 34, that is, the S3-S3' direction.

  A spherical projecting portion 44a of an engaging member 44 fixed on the control rod 35 with a pin is slidably engaged with the recess 43 provided in the projecting portion 42a of the second lever 42.

  For this reason, when the second lever 42 moves in the axial direction (S3-S3 'direction), the control rod 35 rotates around the axis, that is, in the S4-S4' direction, and the second lever 42 rotates around the axis (T3- When the control rod 35 is rotated in the (T3 ′ direction), the control rod 35 moves in the axial direction, that is, in the T4-T4 ′ direction.

  On the control rod 35, as shown in FIG. 5, any one of the gate portions 36a, 37a, 38a of the shift forks 36, 37, 38 is selected by a selection operation (rotation in the S4-S4 'direction). A gate mechanism 45 that engages and shifts any one of the shift forks 36, 37, and 38 in the axial direction by a shift operation (movement in the T4-T4 'direction) is provided.

  That is, to summarize the operation of the speed change operation mechanism 30, when the driver performs a select operation on a change operation lever (not shown), the control rod 35 rotates around the axis (in the S4-S4 'direction) When any one of the shift forks 36, 37, 38 is selected and the change operation lever is shifted, the control rod 35 moves in the axial direction (T4-T4 'direction), and the selected shift fork is selected. By moving in the axial direction, the synchronizer that engages with the shift fork is activated, and the transmission gear train shifts from the non-transmission state to the transmission state. Thus, the speed change operation of the transmission 1 is performed.

Next, the installation structure of the neutral switch 50 of this embodiment will be described.
In general, a neutral switch of a transmission detects a neutral state of the transmission and transmits a neutral signal to an engine control unit that performs engine control. For this reason, the neutral switch is required to detect the neutral state of the transmission as accurately and quickly as possible.

  In this embodiment, as shown in FIG. 4, an extending portion 35 a that extends to the front side of the transmission from the support portion 23 of the clutch housing 2 is provided at the front end portion of the control rod 35 described above, and corresponds to the extending portion 35 a. A neutral switch 50 for detecting the neutral state is installed in the housing recess 24 formed in the clutch housing 2, and the neutral state of the transmission 1 is detected by the operation (position) of the control rod 35. .

  For this reason, the neutral state of the transmission 1 can be directly detected from the control rod 35 that controls the shifting operation, and a neutral signal can be obtained with high accuracy.

  The neutral switch 50 is provided with a convex sensing part 51 that can be projected and retracted at a tip part, a male screw part 52 fastened to the opening hole 25 of the clutch housing 2 around the front end part, and a hexagonal part 53 at a rear position thereof. And a harness attaching portion 54 at the rear end thereof.

  Then, an uneven cam portion 55 with which the sensing portion 51 abuts is formed in the extending portion 35a of the control rod 35, and when the control rod 35 is shifted (moved in the T4-T4 ′ direction), The neutral switch 50 is configured to detect the neutral state of the transmission 1 by changing the contact position of the convex sensing unit 51 so as to appear and retract. In addition, the position of the control rod 35 shown in FIG. 4 has shown the position of the neutral state.

  The clutch housing 2 is formed with a cylindrical bottomed bag-shaped recess 26 that accommodates the extending portion 35 a of the control rod 35. The vicinity of the opening of the bag-like recess 26 constitutes the support portion 23 of the control rod 35 described above.

  Further, a bearing bush 56 for reducing sliding resistance with the control rod 35 is interposed on the inner peripheral surface of the support portion 23. As a result, the bag-like recess 26 is isolated from the gear space G in which the transmission gears and the like are accommodated, and the mission oil does not easily flow into the bag-like recess 26.

  In addition, since the bag-like recess 26 is formed, a bulging portion 27 is formed in the clutch housing portion 21, but bulges at the position of the dead space corresponding to the outer portion of the clutch device 5. Therefore, the clutch device 5 is not adversely affected.

  As shown in FIG. 4, the aforementioned engaging member 44 is installed at a position adjacent to the extending portion 35a of the control rod 35. This engaging member 44 gives a sense of moderation to the change operation. A detent mechanism 60 and a guide mechanism 70 for guiding the select / shift position of the control rod 35 are provided.

  First, the detent mechanism 60 includes a cylindrical member 61 fitted into a hole penetrating from the outside to the inside of the clutch casing 2, a lid-like member 62 fitted inside the cylindrical member, and the lid-like member 61. Spring member 63 that urges the engagement member 44 toward the engagement member 44, and a freely rotatable ball 64 at the distal end recess of the lid-like member 62. ... (Load characteristic setting portion) is engaged in a pressed state, so that the ball 64 gets over the recesses 65 during a speed change operation to generate a moderation feeling.

  The guide mechanism 70 fixes the guide plate 72 fixed to the inner surface of the clutch housing 2 with the fixing bolt 71, the guide pin 73 engaged with the shift pattern groove 72 a formed in the guide plate 72, and the guide pin 73. The arm portion 74 of the engaging member 44 is provided, and the operating position (moving position) of the control rod 35 is guided by a predetermined shift pattern groove formed in the guide plate 72.

  Thus, by providing the engaging member 44 provided on the control rod 35 with the detent mechanism 60 and the guide mechanism 70, the position of the control rod 35 is more reliably defined without rattling. Therefore, in the present embodiment in which the neutral state is detected by detecting the operation of the control rod 35, the detection accuracy of the neutral state is increased.

  Further, since the installation position of the engaging member 44 is adjacent to the neutral switch 50, the control rod 35 is not easily affected by changes in the axial length due to aging, elastic deformation, thermal deformation, etc. Since a shift fork or the like that applies a load to the control rod 35 is not installed between the joint member 44 and the neutral switch 50, the detection accuracy of the neutral switch 50 is further increased.

  As shown in FIG. 6, the neutral switch 50 is installed so as to be positioned on the lower surface portion of the transmission casing 10 when the transmission 1 is mounted on the vehicle.

  In other words, the transmission 1 is mounted horizontally on the side of an engine (not shown in FIG. 6) horizontally disposed in the engine room ER in the front of the vehicle (the left side in FIG. 6 is the front of the vehicle). Since the control rod 35 is located at the lower part of the transmission 1 (the primary shaft 7 and the like are arranged so as to extend in the vehicle width direction), the neutral switch 50 is provided on the lower surface portion 10 a of the transmission casing 10. It is doing.

  Further, since the neutral switch 50 is installed in the housing recess 24 formed on the outer surface of the clutch housing 2 as described above, the neutral switch 50 is installed at a recessed position away from the lower surface portion 10a of the transmission casing 10. Will be. This, combined with the presence of a plurality of reinforcing ribs 28 (see FIG. 7) standing upright on the outer surface of the clutch housing 2, causes the neutral switch 50 installed at a position close to the road surface R to be It will protect from R reliably.

  Further, as shown in FIG. 6, the installation angle of the neutral switch 50 is slightly inclined toward the vehicle rear side (inclination angle α) and inclined toward the tangential T direction side of the outer surface of the transmission casing 10. . As a result, the harness 56 that protrudes from the neutral switch 50 to the outside of the transmission 1 can extend along the outer surface of the transmission casing 10 without being largely bent. In particular, the protrusion of the harness 56a near the neutral switch 50 close to the road surface R can be prevented.

  Further, since the neutral switch 50 is installed with the installation angle inclined as described above, the fastening bolt 80 is fastened when the clutch housing 2 is fastened to the cylinder block E of the engine as shown in FIG. Interference between the jig 81 (indicated by a one-dot chain line) and the neutral switch 50 can be prevented.

  For this reason, the transmission 1 can be assembled to the engine in a state in which the neutral switch 50 is mounted (subassembled) on the transmission 1 in advance.

  6 is a locking clip member for locking and fixing the harness 56 of the neutral switch 50 to the transmission 1, and 58 is a connector for assembling the harness 56 to the engine control unit.

Next, the effect of this embodiment comprised in this way is demonstrated.
In this embodiment, a support portion 23 formed on the clutch housing 2 and supporting the control rod 35, an extension portion 35a formed on the control rod 35 and extending to the clutch housing 2 side beyond the support portion 23, A neutral switch 50 is provided in the clutch housing 2 corresponding to the extended portion 35a, and detects the neutral state of the transmission 1 by detecting the operation of the control rod 35.

According to the above configuration, the neutral switch 50 detects the operation of the control rod 35 at the extended portion 35a of the control rod 35 beyond the support portion 23 of the clutch housing 2, and detects the neutral state of the transmission 1. become.
Therefore, the operation of the control rod 35 can be detected by the extending portion 35a extending to the clutch housing 2 side without extending the control rod 35 to the end cover 4 side.
In this way, the control rod 35 is extended on the clutch housing 2 side, and the neutral state is detected by the neutral switch 50, so that the neutral switch 50 can be effectively used by using the dead space in the outer portion of the clutch device 5. The transmission 1 can be prevented from being enlarged.
Therefore, in installing the neutral switch 50 in the transmission operation mechanism 30 of the transmission 1, it is possible to increase the detection accuracy of the neutral switch 50 and prevent the transmission 1 from becoming large, and to make the transmission 1 compact. it can.

  In place of the neutral switch 50 of this embodiment, a shift stage switch that detects the shift stage of the transmission 1 or a reverse switch that detects the reverse stage may be installed.

  Further, in this embodiment, the clutch housing 2 is formed with a bag-like recess 26 formed of a portion for receiving the support portion 23 of the control rod 35 and the extending portion 35 a of the control rod 35, and the support portion 23 and the control rod 35. A bearing bush 56 is provided between them.

As a result, the extending portion 35a of the control rod 35 is positioned in a sealed space that is isolated from the gear space G in the transmission casing 10 by the bag-like recess 26 and the bearing bush 56, and the mission oil adheres thereto. It becomes difficult.
For this reason, it is difficult for the mission oil to flow into the neutral switch 50 abutting against the extended portion 35a, and iron powder or the like contained in the mission oil is less likely to be mixed into the neutral switch 50.
Therefore, failure of the neutral switch 50 due to so-called contamination (clogging) can be prevented, and the reliability of the neutral switch 50 can be improved.

Further, in this embodiment, the neutral state is detected by the cam portion 55 having an uneven surface formed in the extending portion 35 a of the control rod 35 and the convex sensing portion 51 in contact with the cam portion 55. It is composed.
Thus, even if the structure for detecting the neutral state is configured by the cam portion 55 on the uneven surface of the extending portion 35 a and the convex sensing portion 51, the extending portion 35 a is located in the sealed space of the bag-like recessed portion 26. Therefore, the iron powder contained in the mission oil is not likely to be sandwiched between the cam portion 55 having the uneven surface and the convex sensing portion 51.
Therefore, the detection accuracy of the detection structure constituted by the concave and convex cam portion 55 and the convex sensing portion 51 can be more stably increased.

In this embodiment, the engagement member 44 provided on the control rod 35 is provided with a load characteristic setting portion (a plurality of recesses) 65 and is pressed and urged so as to always contact the load characteristic setting portion 65. A detent mechanism 60 having a ball 64 is provided in the clutch casing 2.
As a result, the position of the control rod 35 when the speed change operation is performed is more reliably defined, and the detent mechanism 60 is provided in the same clutch casing 2 as the neutral switch 50, so that the neutral switch 50, the detent mechanism 60, There is no relative positional shift.
Therefore, the operation of the control rod 35 can be detected with higher accuracy, and the detection accuracy of the neutral switch 50 can be further increased.

In this embodiment, the engaging member 44 provided with the load characteristic setting portion 65 is installed adjacent to the extending portion 35 a of the control rod 35.
As a result, the neutral switch 50 can reliably detect the operation of the control rod 35 without being affected by changes in the axial length due to aging, elastic deformation, thermal deformation, etc. of the control rod 35 itself.
Therefore, the neutral switch 50 can detect the operating position of the control rod 35 more accurately and accurately.

In this embodiment, the neutral switch 50 is installed in the housing recess 24 formed on the outer surface of the clutch housing 2.
Thus, in a state where the neutral switch 50 is mounted on the transmission, the neutral switch 50 does not protrude greatly from the outer surface of the transmission casing 10, so that it is protected by the clutch housing 2 at the periphery of the housing recess 24. Therefore, it is possible to prevent the neutral switch 50 from dropping or damaging as much as possible.
Therefore, durability and reliability of the neutral switch 50 can be improved.

Further, in this embodiment, the installation position of the neutral switch 50 is a portion that does not interfere with the fastening jig 81 of the mounting bolt 80 when the neutral switch 50 is mounted on the clutch housing 2, specifically, the transmission casing 10. The lower surface portion 10a is set at a position slightly inclined toward the vehicle rear side.
Thus, when the clutch housing 2 is mounted on the cylinder block E of the engine with the neutral switch 50 mounted on the transmission 1, the fastening jig 81 of the mounting bolt 80 does not interfere with the neutral switch 50, and the transmission 1 Assembling property to the engine can be improved.
Therefore, even if the neutral switch 50 is mounted on the transmission in advance, the transmission 1 can be assembled to the engine, and the assembly of the transmission can be improved.

In this embodiment, the installation angle (inclination angle α) of the neutral switch 50 is inclined in the tangential direction of the outer surface of the clutch housing 2.
Thereby, the harness 56 extended from the neutral switch 50 can be arrange | positioned along the outer surface of the clutch housing 2 without making it bend | curve large.
Therefore, the protrusion amount of the harness 56 of the neutral switch 50 from the outer surface of the clutch housing 2 can be suppressed as much as possible without greatly bending the harness 56, and the transmission 1 can be operated without applying a load to the harness 56. It can be configured compactly.

In this embodiment, the neutral switch 50 is installed in the housing recess 24 formed in the clutch housing. However, depending on the shape of the clutch housing, the neutral switch 50 can be directly connected to the clutch housing without forming the housing recess. 50 may be installed.
As described above, when the neutral switch 50 is installed without providing the housing recess 24, the effect of protecting the neutral switch with the clutch housing cannot be obtained, but the assembly and maintenance of the neutral switch can be improved. The effect that can be obtained.

  Further, the neutral switch 50 may be installed vertically without being inclined. Also in this case, it is possible to obtain the effect that the neutral switch can be easily assembled and maintained.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The transmission case of the present invention corresponds to the mission case 3,
Similarly,
The control rod support part corresponds to the support part 23,
The shift switch corresponds to the neutral switch 50,
The bush corresponds to the bearing bush 56,
The present invention is not limited to the above-described embodiment, but includes an embodiment that is applied to a shift operation mechanism of any transmission.

1 is a longitudinal sectional view of a transmission that employs a speed change operation mechanism of the present invention. The principal part rear view of the periphery of the speed change operation mechanism which saw through the transmission from the rear side. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is a detailed view of a main part of FIG. 3. FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3. Explanatory drawing explaining the handling of the harness in the state which mounted the transmission in the vehicle. The bottom view which looked at the attachment state of the neutral switch from the transmission lower part.

Explanation of symbols

E ... Engine cylinder block 1 ... Transmission 2 ... Clutch housing 3 ... Transmission case 5 ... Clutch device 23 ... Supporting part 24 ... Housing recess 26 ... Bag-like recess 35 ... Control rod 35a ... Extension part 50 ... Neutral switch

Claims (8)

A clutch housing that is connected to a cylinder block of an engine and houses a clutch device that connects and disconnects an output shaft of the engine and an input shaft of the transmission, a transmission case that is connected to the clutch housing and houses a transmission mechanism, and the transmission mechanism A shift operation mechanism for a transmission, comprising: a shift fork that performs a switching operation; and a control rod that transmits a shift operation of a driver to the shift fork,
A control rod support that is formed in the clutch housing and supports the control rod;
An extension portion formed on the control rod and extending in the clutch housing side direction beyond the control rod support portion;
A transmission operation mechanism for a transmission, comprising: a transmission switch disposed at a position corresponding to the extended portion of the clutch housing and detecting an operation of a control rod to detect a transmission state of the transmission. A bag-shaped recess formed in the clutch housing and comprising a portion for accommodating the control rod support portion and the extension portion of the control rod;
The speed change operation mechanism according to claim 1, further comprising a bush provided between the control rod support portion and the control rod. A cam portion formed on the extending portion of the control rod and having an uneven surface in the axial direction of the control rod;
The transmission operation mechanism for a transmission according to claim 2, further comprising: a convex sensing portion that is provided on the transmission switch and abuts against the cam portion. A detent load characteristic setting unit installed on the control rod so as to have an uneven surface in the axial direction of the control rod;
The transmission operation mechanism of a transmission according to claim 1, further comprising a detent mechanism that is installed in the clutch housing and has a detent member that is pressed and urged so as to always contact the detent load characteristic setting unit. The transmission operation mechanism for a transmission according to claim 4, wherein the detent load characteristic setting unit is installed adjacent to an extending part of the control rod. The transmission operation mechanism for a transmission according to any one of claims 1 to 5, wherein the transmission switch is installed in an accommodation recess formed on an outer surface of the clutch housing. A mounting bolt for mounting the clutch housing to a cylinder block of the engine;
The speed change operation mechanism of the transmission according to any one of claims 1 to 6, wherein an installation position of the speed change switch is set to a part that does not interfere with a fastening jig of the mounting bolt in a state where the speed change switch is mounted on the clutch housing. The transmission operation mechanism of the transmission according to any one of claims 1 to 7, wherein an installation angle of the transmission switch is inclined in a tangential direction of an outer surface of the clutch housing.

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