JP7264664B2 - manual transmission - Google Patents

Description

TECHNICAL FIELD The present invention relates to a manual transmission mounted on a vehicle.

Conventionally, a manual transmission mounted on a vehicle includes an operating shaft that rotates about an axis or slides in an axial direction in conjunction with operation of a gearshift lever, a guide pin provided on the operating shaft, and a movement of the guide pin. and a guide plate that regulates the movable range in the direction. By restricting the movable range of the guide pin in the direction of movement by means of restriction grooves formed in the guide plate, rattling of the guide pin in each direction of movement and, in turn, rattling of the shift lever in each direction of operation are prevented. , to improve the operation feeling. Patent Document 1 discloses an example of this type of manual transmission.

In the manual transmission disclosed in Patent Document 1, the operating shaft is configured to rotate about the shaft in conjunction with the select operation of the gearshift lever, and to slide axially in conjunction with the shift operation of the gearshift lever. there is The guide plate is formed in a curved plate shape projecting outward when viewed from the operation shaft (see FIGS. 3, 4 and 6 of Patent Document 1).

JP 2017-211048 A

By the way, in the configuration of Patent Document 1, the center of rotation of the operation shaft and the center of curvature of the guide plate (the center of a circle when the curved side surface of the guide plate is regarded as an arc) are aligned when viewed from the direction in which the operation shaft extends. I am doing it. Therefore, the guide pin inserted into the regulating groove of the guide plate always comes into contact with the regulating groove at the same position each time the shift lever is operated, and the contact position tends to be locally worn. There was a problem.

In order to avoid such a problem, it is possible to adopt a guide pin with high hardness, but in this case, in manufacturing the guide pin, it is necessary to select a material to improve hardness and special heat treatment, which reduces the cost. I was invited.

It is a technical object of the present invention to provide an improved manual transmission in consideration of the above situation.

The invention of the present application comprises an operation shaft that rotates around an axis or slides in an axial direction in conjunction with operation of a shift lever, a guide pin provided on the operation shaft, and a movable range of the guide pin in the moving direction. The guide plate is formed in a curved plate shape protruding outward when viewed from the operating shaft, and when viewed from the direction in which the operating shaft The positional relationship between the center of rotation of the operating shaft and the center of curvature of the guide plate is defined so that the center of curvature of the guide plate is offset from the center of rotation of the shaft.

In the manual transmission according to the present invention, the operation shaft is configured to rotate about the shaft in conjunction with a select operation of the gearshift lever and to slide axially in conjunction with a shift operation of the gearshift lever. You may

According to the manual transmission of the present invention, the guide plate is formed in a curved plate shape projecting outward when viewed from the operation shaft, and the curvature of the guide plate from the center of rotation of the operation shaft when viewed from the direction in which the operation shaft extends. Since the positional relationship between the center of rotation of the operating shaft and the center of curvature of the guide plate is defined so as to make the center eccentric, when the shift lever is operated, the contact position of the guide pin with respect to the guide plate does not change. become. Therefore, local wear of the guide pin can be easily prevented. As a result, it is possible to manufacture guide pins with a hardness equivalent to that of ordinary quenching, without using costly materials or performing special heat treatments to improve hardness, thereby reducing costs. .

1 is a schematic plan view of a manual transmission; FIG. 1 is a schematic perspective view of a manual transmission; FIG. 1 is a skeleton diagram showing a power transmission system of a manual transmission; FIG. FIG. 5 is a schematic plan view showing a select operation and a shift operation in floor shift; 4 is a perspective view of the transmission gear mechanism and the switching mechanism with the main body and the lid separated; FIG. FIG. 4 is a plan view of the transmission gear mechanism and the switching mechanism in a state where the main body and the lid are separated; FIG. 4 is a side view of the transmission gear mechanism and the switching mechanism with the main body and the lid separated; 4 is an enlarged perspective view showing the relationship between the transmission gear mechanism and the switching mechanism; FIG. It is an enlarged side view showing a regulation mechanism. FIG. 5 is an enlarged plan view showing the relationship between the regulation groove of the guide plate and the guide pin;

Embodiments of the present invention will be described below with reference to the drawings. In the following description, when using terms indicating specific directions and positions (e.g., “left and right”, “up and down”, etc.) as necessary, the left side of the vehicle in which the engine E and the manual transmission 1 are mounted will be referred to as the forward direction. These are referred to simply as the left side and the right side in the forward direction as the right side. These terms are used for convenience of explanation and do not limit the technical scope of the present invention. 1 to 10 all show a state in which the floor shifter 9 in the vehicle is positioned at a neutral position (neutral position).

As shown in FIGS. 1 and 2, the manual transmission 1 of the embodiment has five forward speeds and one reverse speed. is attached to the engine E so as to be positioned on the left side of the As shown in FIG. 3 and subsequent figures, the manual transmission 1 includes a transmission gear mechanism 2 for shifting the output from the engine E, a switching mechanism 3 for switching the transmission gear mechanism 2, and the transmission gear mechanism 2 and the switching mechanism 3. and a transmission case 4 for housing.

The transmission case 4 is divided in two by a main body portion 5 having a large depth and a cover portion 6 that closes the opening of the main body portion 5 . Although detailed illustration is omitted, the body portion 5 is open rightward. The lid portion 6 is open toward both the left and right sides. A partition wall is formed in the lid portion 6 to divide the inside into right and left. Accordingly, the lid portion 6 is formed with a left opening and a right opening having the partition wall as a bottom.

A part of the transmission gear mechanism 2 and the switching mechanism 3 are accommodated in the left opening of the lid portion 6 , and most of the transmission gear mechanism 2 and the switching mechanism 3 are accommodated in the main body portion 5 . In the embodiment, the differential gear mechanism 7 is also accommodated inside the transmission case 4 (specifically, inside the left opening of the lid portion 6). That is, the transmission case 4 of the embodiment is a so-called transaxle case that accommodates the transmission gear mechanism 2 and the differential gear mechanism 7 therein. That is, the manual transmission 1 of the embodiment is adopted as a front-wheel drive type. The body portion 5 and the lid portion 6 (on the left opening side) are bolted together with the transmission gear mechanism 2, the switching mechanism 3 and the differential gear mechanism 7 accommodated therein. A shaft group of the transmission gear mechanism 2 and the switching mechanism 3 extends along the opening direction of the body portion 5 (the fastening direction of the body portion 5 and the lid portion 6, in the embodiment, the left-right direction).

A main clutch CL that connects and disconnects power transmission from the engine E to the transmission gear mechanism 2 is accommodated in the right opening of the lid portion 6 . A shift input shaft 10 (details of which will be described later) of the shift gear mechanism 2 rotatably penetrates a partition wall inside the lid portion 6 . An engine output shaft SH (crankshaft) projecting from the engine E is connected to a shift input shaft 10 projecting into the right opening via a main clutch CL. The lid portion 6 (on the right opening side) is bolted to the engine E while accommodating the main clutch CL.

The power of the engine E is transmitted from the engine output shaft SH to the transmission gear mechanism 2 and appropriately changed in speed.

Next, the operation pattern of the floor shifter 9 as a shift lever will be described. As shown in FIG. 4, the floor shifter 9 has one select groove extending in the select direction when the width direction (horizontal direction) of the vehicle is the select direction, and the direction intersecting the select direction (the longitudinal direction of the vehicle) is the shift direction. 40 and a plurality of shift grooves 41 to 46 extending in the shift direction. A first-speed shift groove 41, a third-speed shift groove 43, and a fifth-speed shift groove 45 are positioned in this order from the left side of the select groove 40 on the front side of the select groove 40. A speed shift groove 44 and a reverse shift groove 46 are located. The sets of the first-speed shift groove 41 and the second-speed shift groove 42 are arranged in the same straight line in the shift direction. The same applies to the set of the 3rd speed shift groove 43 and the 4th speed shift groove 44 and the set of the 5th speed shift groove 45 and the reverse shift groove 46 . A completely neutral position of the floor shifter 9 is set at a position where the select groove 40 intersects with the 3rd speed shift groove 43 and the 4th speed shift groove 44 .

Next, the transmission gear mechanism 2 of the manual transmission 1 will be described. As shown in detail in FIG. 3, the transmission gear mechanism 2 accommodated in the transmission case 4 includes a transmission input shaft 10 to which the power of the engine E is input, and a transmission input shaft 10 extending parallel to the transmission input shaft 10 and differentially acting. and a speed change output shaft 20 that transmits power to the gear mechanism 7 . The transmission input shaft 10 and the transmission output shaft 20 are provided with a plurality of forward gear trains G1 to G5 for transmitting power from the transmission input shaft 10 to the transmission output shaft 20, and a reverse gear train GR. Each of the forward gear trains G1 to G5 is composed of two gears that are in constant mesh with each other. The reverse gear train GR is composed of three gears that mesh with each other when the vehicle is moving backward. In the transmission gear mechanism 2 of the embodiment, from the engine E side, there are a first gear train G1, a reverse gear train GR, a second gear train G2, a third gear train G3, a fourth gear train G4, and a fifth gear train G5. They are in order.

A first-speed gear train G1 and a second-speed gear train G2 are respectively a first-speed input gear 11 and a second-speed input gear 12 fixed to a transmission input shaft 10, and a first-speed output gear fitted to a transmission output shaft 20 so as to be relatively rotatable. 21 and second speed output gear 22 . The third-speed gear train G3 to fifth-speed gear train G5 are composed of a third-speed input gear 13 to a fifth-speed input gear 15 fitted on the transmission input shaft 10 so as to be relatively rotatable, and a third-speed output gear fixed to the transmission output shaft 20. It has a gear 23 to a fifth speed output gear 25 . The reverse gear train GR includes a reverse input gear 17 fixed to the speed change input shaft 10, a reverse output gear 27 fitted on the speed change output shaft 20 so as to be non-rotatable and slidable in the axial direction, the speed change input shaft 10 and the speed change gear. A reverse idle gear 37 is rotatably and axially slidably fitted on a reverse idle shaft 30 extending parallel to the output shaft 20 . An output gear 28 that always meshes with the ring gear 8 of the differential gear mechanism 7 is fixed to the end (right end) of the speed change output shaft 20 near the engine E. As shown in FIG.

A low-speed slider 51 is fitted between the first-speed output gear 21 and the second-speed output gear 22 on the speed change output shaft 20 so as to be axially slidable and non-rotatable. The action of the low-speed slider 51 selectively connects the first-speed output gear 21 and the second-speed output gear 22 to the speed change output shaft 20 . Between the third speed input gear 13 and the fourth speed input gear 14 on the speed change input shaft 10, a medium speed slider 52 is fitted so as to be axially slidable and non-rotatable relative to each other. The third-speed input gear 13 and the fourth-speed input gear 14 are alternatively connected to the shift input shaft 10 by the action of the intermediate speed slider 52 . A high-speed slider 53 is fitted on the transmission input shaft 10 at a position farther from the engine E than the fifth-speed input gear 15 so as to be axially slidable and not relatively rotatable. The action of the high-speed slider 53 connects or disconnects the fifth speed input gear 15 with the shift input shaft 10 .

By sliding the sliders 51, 52, 53 along the transmission output shaft 20 or the transmission input shaft 10 based on the forward shift operation of the floor shift 9 (operation in the front-rear direction along the shift grooves 41 to 45), the relative The rotatable output gears 21, 22 or the input gears 13-15 are fixed to the speed change output shaft 20 or the speed change input shaft 10, and the corresponding forward speed gear trains G1-G5 are in the power connection state.

Specifically, when the low-speed slider 51 slides to the engine E side (right side), the first speed output gear 21 is connected to the speed change output shaft 20 . As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, the speed change input shaft 10, the first speed input gear 11, the first speed output gear 21, the speed change output shaft 20, and the output gear 28. front wheels are rotationally driven in the first forward speed state. When the low-speed slider 51 slides away from the engine E (to the left), the second speed output gear 22 is connected to the speed change output shaft 20 . As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, the speed change input shaft 10, the second speed input gear 12, the second speed output gear 22, the speed change output shaft 20, and the output gear 28. front wheels are rotationally driven in forward second speed.

When the medium speed slider 52 slides toward the engine E, the third speed input gear 13 is connected to the shift input shaft 10 . As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, the speed change input shaft 10, the third speed input gear 13, the third speed output gear 23, the speed change output shaft 20, and the output gear 28. The front wheels of are rotationally driven in the forward third speed state. When the medium speed slider 52 slides away from the engine E, the fourth speed input gear 14 is connected to the shift input shaft 10 . As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, the speed change input shaft 10, the fourth speed input gear 14, the fourth speed output gear 24, the speed change output shaft 20, and the output gear 28. front wheels are rotationally driven in the forward four-speed state.

When the high-speed slider 53 slides toward the engine E, the fifth speed input gear 15 is connected to the shift input shaft 10 . As a result, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, the speed change input shaft 10, the fifth speed input gear 15, the fifth speed output gear 25, the speed change output shaft 20, and the output gear 28. The front wheels of the are driven to rotate in the fifth forward speed state.

A reverse output gear 27 forming a reverse gear train GR is attached to a low-speed slider 51 . By sliding the reverse idle gear 37 away from the engine E along the reverse idle shaft 30 based on the reverse shift operation (operation along the reverse shift groove 46) of the floor shifter 9, the reverse idle gear 37 receives the reverse input. It meshes with both the gear 17 and the reverse output gear 27 . As a result, the reverse gear train GR enters the power connection state. That is, the power of the engine E is transmitted to the differential gear mechanism 7 via the main clutch CL, the shift input shaft 10, the reverse input gear 17, the reverse idle gear 37, the reverse output gear 27, the shift output shaft 20, and the output gear 28. , the left and right front wheels are rotationally driven in reverse.

Next, the switching mechanism 3 of the manual transmission 1 will be explained. As shown in FIGS. 5 to 8, the switching mechanism 3 in the transmission case 4 includes a low-medium speed operation shaft 61 extending parallel to the speed change input shaft 10, the speed change output shaft 20 and the reverse idle shaft 30, and a high speed reverse operation shaft 61. A shaft 62 is provided. Both the low-medium speed operation shaft 61 and the high-speed reverse operation shaft 62 are supported in the transmission case 4 so as to be slidable in the axial direction. In the embodiment, one end side (right end side) of the low/medium speed operation shaft 61 and the high speed reverse operation shaft 62 is axially slidably supported by the partition wall of the lid portion 6, and the low/medium speed operation shaft 61 and the high speed reverse operation shaft 61 are supported by the partition wall of the lid portion 6 so as to be axially slidable. The other end side (left end side) of the shaft 62 is supported by the inner wall of the body portion 5 so as to be slidable in the axial direction.

A low-speed fork 63 engaged with the low-speed slider 51 and a medium-speed fork 64 engaged with the medium-speed slider 52 are axially slidably fitted to the low-medium speed operation shaft 61 . A high-speed fork 65 that engages the high-speed slider 53 and a reverse fork 66 that slides the reverse idle gear 37 are fixed to the high-speed reverse operation shaft 62 . Between the low-speed fork 63 and the medium-speed fork 64 on the low-medium speed operation shaft 61, a selection arm 67 for alternatively selecting the low-speed fork 63, the medium-speed fork 64 or the reverse fork 66, and the selection arm 67 are provided. A guide lever 68 that rotates about the low-to-medium speed operating shaft 61 is attached.

The selection arm 67 is fixed to the low/medium speed operation shaft 61 and is rotatable together with the low/medium speed operation shaft 61 . The guide lever 68 is fitted so as to be slidable relative to the low/medium speed operating shaft 61 and rotatable around the low/medium speed operating shaft 61 . The guide lever 68 cannot slide along the low/medium speed operation shaft 61 . The low-speed fork 63, the medium-speed fork 64, and the reverse fork 66 are provided with engagement pieces 69-71, respectively, with which the tip side of the selection arm 67 can be engaged.

By rotating the guide lever 68 about the low/medium speed operating shaft 61 , the selection arm 67 rotates about the low/medium speed operating shaft 61 to engage the low speed engaging piece 69 of the low speed fork 63 and the medium speed fork 64 . It engages with either the medium speed engagement piece 70 or the reverse movement engagement piece 71 of the reverse movement fork 66 . As a result, the low-speed fork 63, the medium-speed fork 64, and the reverse fork 66 are alternatively connected to the selection arm 67 and thus to the low-to-medium speed operation shaft 61. In the embodiment, when the selection arm 67 selects one of the low-speed fork 63, the medium-speed fork 64, or the reverse fork 66, the action of the guide lever 68 causes the non-selected fork to move to the low-medium speed operation shaft 61 or the high-speed fork. It is configured to prevent sliding movement along the reverse operation shaft 62 .

A shift sleeve 72 with a locking groove 73 is fixed to a portion closer to the engine E than the low speed fork 63 on the low and medium speed operation shaft 61 . The shift sleeve 72 and the low/medium speed operation shaft 61 are configured to slide axially in association with the rotation of the shift arm 81, which will be described later.

When the guide lever 68 is rotated around the low/medium speed operation shaft 61 based on the select operation of the floor shifter 9 (operation in the left-right direction along the select groove 40), the select arm 67 is lowered in conjunction with the guide lever 68. Rotating around the medium speed operation shaft 61 , the selection arm 67 selects the low speed engagement piece 69 of the low speed fork 63 , the medium speed engagement piece 70 of the medium speed fork 64 or the reverse engagement piece 71 of the reverse fork 66 . unilaterally engage. As a result, the low-speed fork 63, the medium-speed fork 64, and the reverse fork 66 are alternatively connected to the selection arm 67 and thus to the low-to-medium speed operation shaft 61.

When the shift sleeve 72 and thus the low/middle speed operation shaft 61 are slid in the axial direction based on the forward shift operation of the floor shifter 9, the sliders 51 to 53 corresponding to the selected forks 63, 64, 66 are moved to shift output shafts. 20 or the transmission input shaft 10, and the corresponding forward gear train G1-G5 is brought into power engagement as described above.

Specifically, when the floor shifter 9 is operated to the position where the select groove 40 intersects the first-speed shift groove 41 and second-speed shift groove 42 , the selection arm 67 rotated together with the guide lever 68 selects the low-speed fork 63 . Then, when the floor shifter 9 is operated to shift to 1st speed, the shift sleeve 72 and thus the low/medium speed operation shaft 61 are slid to the engine E side (right side), and accordingly the low speed fork 63 and thus the low speed slider 51 are moved to the engine E side. slide to move. As a result, the first speed output gear 21 is connected to the transmission output shaft 20, and the left and right front wheels are rotationally driven in the forward first speed state, as described above.

When the floor shifter 9 is operated to shift to second speed with the low speed fork 63 selected, the shift sleeve 72 and the low and medium speed operation shaft 61 are slid away from the engine E (to the left). The low-speed slider 51 slides away from the engine E. As a result, the second speed output gear 22 is connected to the transmission output shaft 20, and the left and right front wheels are rotationally driven in the forward second speed state, as described above.

When the floor shifter 9 is operated to a position (completely neutral position) where the select groove 40 and the third-speed shift groove 43 and the fourth-speed shift groove 44 intersect, the selection arm 67 rotated together with the guide lever 68 selects the medium-speed fork 64. . Then, when the floor shifter 9 is operated to shift to 3rd speed, the shift sleeve 72 and thus the low/medium speed operation shaft 61 are slid toward the engine E side, and accordingly the middle speed fork 64 and thus the middle speed slider 52 are slid toward the engine E side. Moving. As a result, the third speed input gear 13 is connected to the transmission input shaft 10, and the left and right front wheels are rotationally driven in the forward third speed state, as described above.

When the floor shifter 9 is operated to shift to 4th gear with the medium speed fork 64 selected, the shift sleeve 72 and thus the low/medium speed operation shaft 61 slide away from the engine E, and accordingly the medium speed fork 64 and thus the medium speed fork 64 and the middle speed fork. The speed slider 52 slides away from the engine E. As a result, the fourth-speed input gear 14 is connected to the transmission input shaft 10, and the left and right front wheels are rotationally driven in the forward fourth-speed state, as described above.

When the floor shifter 9 is operated to the position where the select groove 40 intersects the fifth gear shift groove 45 and the reverse shift groove 46 , the select arm 67 rotated together with the guide lever 68 selects the reverse fork 66 . Then, when the floor shifter 9 is operated to shift to 5th speed, the shift sleeve 72 and the low/middle speed operation shaft 61 are slid toward the engine E side. The fork 65 and the high speed slider 53 slide to the engine E side. As a result, the fifth speed input gear 15 is connected to the transmission input shaft 10, and the left and right front wheels are rotationally driven in the forward fifth speed state, as described above.

In this case, the reverse fork 66 is interlocked with the reverse idle gear 37 via a flexible arm 74 . Although details are omitted, the flexible arm 74 moves the reverse idle gear 37 away from the engine E along the reverse idle shaft 30 only when the reverse fork 66 and the high-speed reverse operation shaft 62 slide away from the engine E. It is configured to be slidably moved to the Therefore, when the reverse fork 66 and the high-speed reverse operation shaft 62 slide toward the engine E, the flexible arm 74 prevents the reverse idle gear 37 from sliding.

When the floor shifter 9 is operated to shift backward while the reverse fork 66 is selected, the shift sleeve 72 and the low/medium speed operating shaft 61 slide away from the engine E, and the reverse fork 66 moves away from the engine E accordingly. slide to the side. As a result, the reverse idle gear 37 slides away from the engine E along the reverse idle shaft 30 via the flexible arm 74 , and the reverse idle gear 37 moves to both the reverse input gear 17 and the reverse output gear 27 . As described above, the left and right front wheels are driven to rotate in reverse.

Now, the transmission case 4 includes a shift shaft 76 for performing a shift operation to slide the low/medium speed operation shaft 61 corresponding to the operation shaft referred to in the claims, and a select shaft 76 for performing a select operation to rotate the low/medium speed operation shaft 61 . A shaft 75 is provided. In the embodiment, the shift shaft 76 and the select shaft 75 are rotatably supported (pivotally supported) on the upper surface of the transmission case 4 in a vertical posture extending in a direction intersecting the low/middle speed operation shaft 61 . there). In this case, the select shaft 75 is rotatably supported on the upper surface of the body portion 5 , while the shift shaft 76 is rotatably supported on the upper surface of the lid portion 6 on the left opening side.

A select outer lever 77 for rotating the select shaft 75 is fixed to the end of the select shaft 75 outside the main body 5 . A shift outer lever 78 for rotating the shift shaft 76 is fixed to the end of the shift shaft 76 outside the lid portion 6 . The select outer lever 77 and the shift outer lever 78 are interlocked with the floor shifter 9 via a link mechanism (not shown) including a link mechanism and a wire. By operating the floor shift 9 in the select direction, the select shaft 75 rotates via the linkage mechanism and the select outer lever 77, and by operating the floor shift 9 in the shift direction, the linkage mechanism and the shift outer lever 78 are rotated. The shift shaft 76 is configured to rotate through the shaft.

The shift shaft 76 is configured to engage with the switching mechanism 3 from a direction intersecting the low/middle speed operation shaft 61 . That is, a shift arm 81 that engages with the locking groove portion 73 of the shift sleeve 72 is attached to the tip side of the shift shaft 76 in the lid portion 6 . The shift arm 81 is fitted into the locking groove 73 of the shift sleeve 72 from above. By rotating the shift arm 81 about the shift shaft 76, the shift sleeve 72 and the low/medium speed operation shaft 61 slide axially.

The select shaft 75 is configured to engage with the switching mechanism 3 from the axial direction of the low and medium speed operation shaft 61 . That is, the guide lever 68 is formed with a U-shaped engaging recess 79 that opens upward and in the axial direction of the low-to-medium speed operating shaft 61 , while the selection shaft 75 is formed on the protruding end side of the main body 5 . , a select arm 80 that engages with the locking recess 79 of the guide lever 68 is attached. The select arm 80 moves the guide lever 68 in a posture along the axial direction of the low-to-medium speed operation shaft 61, that is, the opening direction of the main body portion 5 (the fastening direction between the main body portion 5 and the lid portion 6, in the embodiment, the lateral direction). It is inserted into the locking recess 79 . By rotating the select arm 80 about the select shaft 75 , the guide lever 68 and thus the select arm 67 are configured to rotate about the low/medium speed operation shaft 61 .

Although details are omitted, in the left opening of the lid 6, the shift shaft 76 is placed at a neutral position in the shift direction (the position when the floor shift 9 is in the select groove 40; A shift detent mechanism is provided to hold it in the non-sliding position in either direction. The shift shaft 76 is held at the neutral position in the shift direction even when the manual transmission 1 is assembled, and the shift arm 81 and the engagement groove 73 of the shift sleeve 72 can be smoothly engaged. .

In the main body 5, the select shaft 75 is positioned at a completely neutral position (the position where the floor shifter 9 intersects the select groove 40 with the third-speed shift groove 43 and the fourth-speed shift groove 44; A select detent mechanism is provided to hold the detent in the non-rotated position 61). The select shaft 75 is held at the completely neutral position even during the assembly work of the manual transmission 1, and the select arm 80 and the engaging recess 79 of the guide lever 68 can be smoothly engaged.

According to the above configuration, the select shaft 75 is rotatably supported (rotatably supported) by the main body portion 5, while the shift shaft 76 is rotatably supported (rotatably supported) by the lid portion 6. ), during assembly work of the manual transmission 1, prior to connecting the body portion 5 and the cover portion 6, the shafts 10, 20, 30, 61, 62 of the transmission gear mechanism 2 and the switching mechanism 3 are assembled. In a state in which one end side is supported by the lid portion 6 (a state in which the units of the transmission gear mechanism 2 and the switching mechanism 3 are supported by the lid portion 6), the shift shaft 76 (shift arm 81) and the switching mechanism 3 (shift sleeve 72) are arranged. can be performed while visually checking the engagement work with the locking groove portion 73). Therefore, assembly workability is improved. In addition, since the shift shaft 76 can be attached to the lid portion 6 in advance before connecting the main body portion 5 and the lid portion 6, there is no need for a component for preventing the shift shaft 76 from slipping off, which was conventionally required, and cost can be reduced. I can plan.

Further, when connecting the body portion 5 and the lid portion 6, the engagement between the select shaft 75 and the switching mechanism 3 (locking recess portion 79 of the guide lever 68) should be in the axial direction of the low and medium speed operation shaft 61, i.e., the body portion. 5 (the fastening direction between the body portion 5 and the lid portion 6, in the embodiment, the left-right direction). The switching mechanism 3 (locking concave portion 79 of the guide lever 68) is engaged in a one-touch manner, so that the positioning work and the assembling work are extremely easy. Therefore, it can further contribute to the improvement of assembly workability.

Next, the restricting mechanism 85 according to the present invention will be described with reference to FIGS. 9 and 10. FIG. The restriction mechanism 85 is for preventing rattling in each operation direction of the floor shifter 9 and improving the operation feeling. and a guide plate 87 that regulates the movable range of the guide pin 86 in the moving direction. The guide pin 86 of the embodiment is provided integrally with the shift sleeve 72 fixed to the low/medium speed operation shaft 61 in a posture protruding upward. Therefore, the guide pin 86 of the embodiment is configured to be rotatable about the axis and slidable in the axial direction together with the shift sleeve 72 and the low/medium speed operation shaft 61 .

As shown in FIG. 9, the guide plate 87 is attached to the upper portion of the left opening of the lid portion 6 (above the guide pin 86). The guide plate 87 is shaped like a curved plate protruding outward (upward) when viewed from the low/medium speed operation shaft 61 . The guide plate 87 is formed with restriction grooves 90 to 96 into which the tip ends of the guide pins 86 are inserted. The restricting grooves 90 to 96 are defined by one select restricting groove 90 extending in the select restricting direction (in the embodiment, the direction intersecting the low/medium speed operation shaft 61) and one select restricting groove 90 extending in the shift restricting direction (in the embodiment, the axis of the low/medium speed operation shaft 61). direction) and 1st to 5th speed regulation grooves 91 to 95 and a reverse movement regulation groove 96 .

As shown in FIG. 10, on one side of the select restricting groove 90, a first gear restricting groove 91, a third gear restricting groove 93, and a fifth gear restricting groove 95 are positioned in order from the right side of the select restricting groove 90. A second speed restriction groove 92, a fourth speed restriction groove 94 and a reverse movement restriction groove 96 are located on the side. A set of the first-speed regulating groove 91 and the second-speed regulating groove 92 are aligned in the same straight line in the shift regulating direction. The same applies to the set of the 3rd speed restriction groove 93 and the 4th speed restriction groove 94 and the set of the 5th speed restriction groove 95 and the reverse movement restriction groove 96 . A completely neutral position of the floor shifter 9 is set at a position where the select control groove 90 and the third speed control groove 93 and the fourth speed control groove 94 intersect.

The guide pin 86 rotates about the axis or slides in the axial direction together with the shift sleeve 72 and the low/medium speed operation shaft 61, thereby moving the select control groove 90, the first to fifth speed control grooves 91 to 95, and the It is movable along the backward movement restricting groove 96 . By restricting the movable range of the guide pin 86 in the moving direction by the restricting grooves 90 to 96 of the guide plate 87, the rattling of the guide pin 86 in each moving direction and thus the floor shift 9 in each operating direction are prevented. It prevents sticking and improves the operation feeling.

When the guide lever 68 is rotated around the low/medium speed operation shaft 61 based on the select operation of the floor shifter 9 (operation in the left-right direction along the select groove 40), the select arm 67 is lowered in conjunction with the guide lever 68. It rotates around the shaft together with the medium speed operating shaft 61 and the shift sleeve 72 . As a result, the guide pin 86 moves along the select restricting groove 90 in the select restricting direction.

When the shift arm 81 is rotated about the shift shaft 76 based on the forward or reverse shift operation of the floor shift 9, the shift arm 81 axially slides the shift sleeve 72 and thus the low/medium speed operating shaft 61. As shown in FIG. As a result, the guide pin 86 moves in the shift restricting direction along the first speed restricting groove 91 and the second speed restricting groove 92, or along the third speed restricting groove 93 and the fourth speed restricting groove 94 in the shift restricting direction. or move along the fifth speed regulation groove 95 and the reverse movement regulation groove 96 in the shift regulation direction. It should be noted that the guide pin 86 of the embodiment is set to a length that does not come off the regulation grooves 90 to 96 even when it moves along any regulation direction.

In the embodiment shown in FIG. 9, when viewed from the direction (axial direction) in which the low and medium speed operation shaft 61 extends, the rotation center O of the low and medium speed operation shaft 61 and the curvature center P of the guide plate 87 (the curvature center P of the guide plate 87 The center of the circle when the side is regarded as an arc) is shifted. That is, the center of curvature P of the guide plate 87 is eccentric from the center of rotation O of the low-to-middle speed operation shaft 61 when viewed from the direction in which the low-to-middle speed operation shaft 61 extends.

With this configuration, when the floor shifter 9 is operated, the contact position of the guide pin 86 with respect to the guide plate 87 (the guide pin 86 inserted into the regulation grooves 90 to 96 of the guide plate 87 is in the regulation grooves 90 to 96). contact position) will change. In the embodiment, in the select regulation groove 90, the fifth speed and reverse movement regulation grooves 95 and 96 are closer to the first speed and second speed regulation grooves 91 and 92 than the guide pin 86, and the tip side of the guide pin 86 is directed upward from the guide plate 87. will stick out for a long time. Therefore, local wear of the guide pin 86 can be easily prevented. As a result, it is possible to manufacture the guide pin 86 with a hardness equivalent to that of general quenching without adopting a costly material or performing a special heat treatment to improve hardness, thereby reducing costs. It can be planned.

The configuration of each part in the present invention is not limited to the illustrated embodiment, and various modifications are possible without departing from the gist of the present invention. For example, in the manual transmission 1 of the embodiment, the operation shaft (low-to-middle speed operation shaft 61) rotates about the axis in conjunction with the select operation of the gear shift lever (floor shift 9), 9) slides in the axial direction interlocking with the shift operation of 9), but on the contrary, it rotates around the axis interlocking with the shift operation of the gear shift lever (floor shift 9), and the gear shift lever (floor shift 9) It may be configured to slide in the axial direction in conjunction with the select operation of the shift 9). Further, although the manual transmission 1 of the embodiment is adopted for a front-wheel drive type, it is not limited to this, and may be adopted for a rear-wheel drive type or a four-wheel drive type. is also possible.

E engine 1 manual transmission 2 transmission gear mechanism 3 switching mechanism 4 transmission case 5 main body 6 cover 9 floor shift (transmission lever)
61 Low and medium speed operating shaft (operating shaft)
72 shift sleeve 85 regulation mechanism 86 guide pin 87 guide plates 90 to 96 regulation groove

Claims (2)

An operation shaft that rotates about the axis or slides in the axial direction in conjunction with the operation of the shift lever, a guide pin provided on the operation shaft, and a guide plate that regulates the movable range of the guide pin in the moving direction. A manual transmission comprising:
The guide plate is formed in a curved plate shape projecting outward when viewed from the operation shaft, and the center of curvature of the guide plate is eccentric from the rotation center of the operation shaft when viewed from the direction in which the operation shaft extends. The positional relationship between the center of rotation of the operating shaft and the center of curvature of the guide plate is defined as follows:
manual transmission. The operation shaft is configured to rotate about an axis in conjunction with a select operation of the gearshift lever and to slide in an axial direction in conjunction with a shift operation of the gearshift lever.
A manual transmission as claimed in claim 1.

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