JPH025129Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a manual transmission mounted on a vehicle such as an automobile and provided with forward and reverse gears.

In recent years, some manual transmissions have used lubricating oil with low viscosity to reduce the drag resistance caused by the lubricating oil when the transmission gear rotates, thereby improving fuel efficiency. . However,
When such a low-viscosity lubricating oil is used, members that rotate together with the input shaft in the neutral state, such as the counter gear provided on the countershaft, continue to rotate due to inertia even when the clutch is disengaged during gear shifting. For this reason, when shifting from forward to reverse, if the reverse gear does not use a synchronizer, the rotation of the counter gear is not stopped and the gears do not mesh smoothly, resulting in so-called gear squeal. Resulting in.

Therefore, a resistance applying means has conventionally been proposed in which resistance is applied to the counter gear which is now in free rotation when switching to reverse, thereby restraining the rotation of the counter gear due to inertia. For example, as shown in Utility Model Application No. 57-61257, when shifting to reverse, a spring-loaded rod is pressed against the side of the counter reverse gear.
Some devices use rotational resistance at this time to suppress rotation due to inertia of the countershaft.

However, in such conventional resistance applying means, since the rod-shaped body presses a point off the center of the counter-reverse gear, the counter-reverse gear is inclined with respect to the countershaft to which it is spline-coupled. Therefore, when the counter reverse gear meshes with the reverse idler shaft, the inclined counter reverse gear meshes with the reverse idler gear in a diagonal manner, and the backlash between the two gears is different, making it impossible to mesh smoothly. There was a risk that the teeth of the counter reverse gear would wear unevenly.

In view of the conventional situation, the present invention increases the contact area by bringing a ring member into contact with the side of the gear interlocked with the countershaft over almost the entire circumference when shifting to reverse in the neutral state. In addition, it is an object of the present invention to provide a manual transmission in which tilting of the gears is prevented.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Fig. 1 shows a manual transmission 1 used in an F/R (front engine rear drive) vehicle.The rotation transmitted from the engine (not shown) to the input shaft 2 via the clutch (not shown) is transmitted to the main drive gear 3 to the counter drive gear 4, and rotates the counter shaft 5 integrated with the counter drive gear 4. In addition to the counter drive gear 4, the counter shaft 5 is provided with a counter first gear 6, a counter second gear 7, a counter third gear 8, a counter fifth gear 9, and a counter reverse gear 10 so as to rotate together. ing. On the other hand, the output shaft 11 connected to a propeller shaft (not shown) includes counter 1st, 2nd, 3rd, and 5th gears 6, excluding the counter reverse gear 10.
A 1st speed main gear 12, a 2nd speed main gear 13, a 3rd speed main gear 14 and a 5th speed main gear 15 as transmission gears are mounted opposite to the main gears 7, 8 and 9 in a freely configurable manner.
4 and 15 are always in mesh with the counter gears 6, 7, 8, and 9. Synchronous mesh mechanisms 16, 17, and 18 as synchronizers are provided between the 1st speed main gear 12 and 2nd speed main gear 13, between the 3rd speed main gear 14 and main drive gear 3, and on the side of the 5th speed main gear 15. , by engaging one of these synchronizing mechanisms 16, 17, 18 with one of the 1st, 2nd, 3rd, main drive, and 5th speed main gears 12, 13, 14, 3, 15. The desired rotation is transmitted to the output shaft 11.

By the way, the gear change operation during reverse is performed using the synchronized mesh mechanism 18 for the fifth speed, and the coupling sleeve 18 of this synchronized mesh mechanism 18 is used.
A reverse gear 19 is formed on the outer periphery, and the coupling sleeve 18a is moved in the opposite direction to the fifth speed gear 15 during reverse, so that the reverse gear 19 meshes with the counter reverse gear 10. It is meshed with a reverse idler gear 20, and the reverse idler gear 20 reverses two rotations of the input shaft and transmits the reversed rotation to the output shaft 11.
In addition, the synchronized mesh mechanisms 15, 17, 18
Coupling sleeves 16a, 17a, 18a
A shift fork (not shown) is fitted into each of the shift forks, and by operating the control lever 21 based on the operating position of these shift forks as shown in FIG. 22 rotation (select operation), and the selected shift fork is moved in the axial direction (shift operation) of the striking rod 22 to shift the synchronized mesh mechanism 1.
6, 17, 18 are adapted to be activated.

Further, each of the shift forks is fixed to a dedicated fork rod, and the shift fork is moved by selecting one of the fork rods using the striking rod 22 and moving it in the axial direction. It's summery. That is, FIG. 3 shows the selected portion A of the shift fork, in which the striking lever 26 is fixed to the striking rod 22, while the fork rod 23 for 1st and 2nd speeds and the fork rod 24 for 3rd and 4th speeds are fixed to the striking rod 22.
The fork rod 25 for the 5th speed reverse is fixed to brackets 27, 28, 29 which face the striking lever 26 and have bifurcated portions 27a, 28a, 29a at their tips. And when selecting, striking rod 2
2 is rotated, the striking lever 26 is positioned at one of the two crotches 27a, 28a, 29a, and the shifting operation causes the striking lever 26 to move the engaged fork rod in the axial direction. I'm starting to do that.

Here, as shown in FIG.
The main gear 15 has a synchronizing device dedicated to the main gear 15, that is, a synchronizing mechanism 18 for 5th speed.
A cone portion 50 that is concentric with the output shaft 11 serving as a supporting shaft is formed on the outer periphery of the end of the boss portion on the opposite side (right side in FIG. 4) from the side where the boss portion is provided. A pressing member C is fitted into the output shaft 11 on the side facing the cone portion 50 (on the right side in FIG. 4), and the pressing member C is moved to the reverse position by an actuation mechanism B, which will be described later. The cone portion 50 is pressed against the cone portion 50 during a shift operation.

That is, the pressing member C includes a pressing ring 54 provided opposite to the cone portion 50 in the shift direction (the axial direction of the output shaft 11), and a side of the pressing ring 54 facing the cone portion 50 ( A pressing surface 55 that follows the outer shape of the cone portion 50 is formed on the inner periphery of the end of the cone portion 50 (left side in FIG. Figure 4 middle right)
A cylindrical body 57 on which a tapered part 56 is formed as a pressing surface is fixed to the cylindrical body 57. The pressing ring 54 is fitted onto the outer periphery of a fixed ring 52 fixed to the output shaft 11 via a spline 53, so that the pressing ring 54 can be moved in the axial direction with respect to the output shaft 11. It is possible and integrally locked in the direction of rotation to be installed.

The fixing ring 52 is clamped between the bearing 30 of the 5-speed main gear 15 and the nut 31 screwed onto the output shaft 11, and is fixed to the output shaft 11 via the pin 51. ing.

On the other hand, as shown in FIG.
A through hole 61 pointing toward the center of the output shaft 11 is formed in the bulging portion 60 that protrudes opposite to the bulging portion 60 , and a pressing piece 63 biased by a spring 62 is provided inside the through hole 61 . It is structured accordingly. A spherical portion 63a is formed at the lower end of this pressing piece 63, and this spherical portion 63a projects downward from the bulge portion 60 (in the direction of the tapered portion 56). 64
65 is a small diameter portion that prevents the pressing piece 63 from coming off, and 65 is a grommet that receives one end of the spring 62. Then, the striking rod 22 is in 5th gear.
When the striking lever 26 is positioned at the bifurcated portion 29a of the bracket 29 for 5th speed-reverse by selective rotation to the reverse row (clockwise direction in FIG. 3), the spherical portion 63a of the pressing piece 63 It is adapted to come into contact with the tapered portion 56.

With the above configuration, in order to temporarily stop the vehicle from the forward running state and then move it backward, first,
Depress the clutch pedal to disengage the clutch (not shown), select the control lever 21 from the neutral N position shown in Figure 2 to the 5th gear-reverse train, and finally shift to the reverse R position. It is carried out by. By the way, in this embodiment, the control lever 2
When selecting 1 to the 5th speed reverse train,
The spherical part 63a of the pressing piece 63 of the operating mechanism B comes into contact with the tapered part 56 of the pressing member C, and when the shifting operation is performed to the reverse position, the spherical part 63a of the pressing piece 63 of the operating mechanism B contacts the tapered part 56 of the pressing member C, and as the striking rod 22 moves in the axial direction, the spherical part 63a moves together with the striking lever 26. The portion 63a moves in the direction of the 5th speed main gear 15 (leftward in the figure). Then, the spherical portion 63a presses the tapered portion 56 and presses the pressing surface 55 of the press ring 54 against the cone portion 50, creating frictional resistance around the entire circumference of the cone portion 50. Therefore, the counter 5 is placed on the 5th speed main gear 15.
Countershaft 5 interlocked via speed gear 9
A synchronizing action is performed between the output shaft 11 and the output shaft 11 which is interlocked with the press ring 54 via the spline 53 and the fixing ring 52. In other words, since the output shaft 11 is stationary when the vehicle is stopped, rotation of the countershaft 5 due to inertia is suppressed and is reliably stopped by the frictional resistance. Then, the counter reverse gear 10 provided on the counter shaft 5 and the reverse idler gear 20 meshed with the counter reverse gear 10 are also stopped.
Since the stationary reverse gear 19 is meshed with the stopped reverse idler gear 20, it is smoothly meshed without gear squeal. Further, since the cone portion 50 is pressed approximately evenly around the entire circumference by the pressing surface 55, the 5th speed main gear 1
5-speed main gear 1 without causing any inclination in 5-speed main gear 1
5 and the counter 5th speed gear 9 are meshed smoothly.

By the way, in this embodiment, when the striking rod 22 moves further after the pressing surface 55 completely contacts the cone portion 50, the pressing piece 63 resists the spring 62 as shown in FIG. The spherical portion 63a moves upward and moves over the tapered portion 56 to be located at the same diameter portion 56a, reducing the pressing force.
The frictional forces generated in the cone portion 50 are significantly reduced.

Furthermore, as shown in FIG. 6, when the spherical part 63a passes over the tapered part 56 and is located at the same diameter part 56a, by forming a recess 58 in the same diameter part 56a, the spherical part 63a and the cylindrical body 57, thereby releasing the pressure contact between the cone portion 50 and the pressing surface 55, and substantially reliably eliminating rotational resistance generated in the cone portion 50 when the reverse gear 19 is engaged. , it is possible to prevent extra load from being applied when the vehicle is reversing.

By the way, in this embodiment, a manual transmission for F/R has been disclosed, but a manual transmission called a transaxle used for F/F (front engine front drive) cars etc. may also be used. The present invention can be applied. Also, in this transaxle, a type in which the reverse idler gear moves during reverse and meshes with both the reverse counter gear and the reverse gear is often used, but the reverse counter gear stops rotation when selecting the reverse row. A similar effect can be achieved by preventing gear squeal.

Furthermore, in this embodiment, since the reverse position is opposed to the 5th gear position, in this embodiment, the 5th gear main gear 15 is shown with the cone portion 50 formed, but other When the forward positions are opposed to each other, cone portions are formed on the main gears of the opposed forward positions to restrain rotation of the counter gear, thereby restraining the rotation of the countershaft 5.

As explained above, in the present invention, one of the forward positions is arranged opposite to the reverse position in the shift direction, and the transmission gear of the forward position is rotatably fitted to the support shaft thereof, and these transmission gears are arranged opposite to the reverse position in the shift direction. In a manual transmission in which a synchronizing device is provided between the gear and the support shaft, and the synchronizing action by the synchronizing device is performed by axial movement of a striking rod, the side of the speed change gear where the synchronizing device is provided. On the opposite side, a cone part is integrally formed from the transmission gear and is concentric with the support shaft, and a pressing member that can be pressed against the entire circumference of the cone part is opposed to the cone part in the shift direction. and the pressing member is attached to the support shaft so as to be movable in the axial direction and integrally locked in the rotational direction, and a pressing surface is formed on the pressing member on a side opposite to the opposite side of the cone portion. Since the striking rod is provided with a pressing piece that comes into contact with the pressing surface, when the vehicle moves from a forward state to a stop and then moves backward, the cone portion is prevented by the pressing member when shifting to reverse. and is pressed all around. in this way,
By pressing the cone member and the pressing member over the entire circumference, when the pressing member is pressed against the cone part, a substantially equal load acts on the main gear over the entire circumference, so that the main gear is Never tilt. Therefore, the main gear meshes with the counter gear in accordance with the setting, and it is possible to prevent uneven wear of the main gear, which is an excellent effect. Furthermore, in addition to this effect, in the embodiment of the present invention, by forming the pressing surface formed on the pressing member along the cone portion, the contact area between the cone portion and the pressing member is significantly increased. This increases the contact pressure per unit area during pressure contact between these two parts, significantly reduces the amount of wear on the contact surfaces, and improves durability.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of the manual transmission, Figure 2 is an explanatory diagram showing the operating position of the control lever, and Figure 3 is a cross-sectional side view of the manual transmission.
The figure is a cross-sectional view showing selected parts of the manual transmission of the present invention, Figure 4 is a cross-sectional side view showing essential parts of the manual transmission of the present invention, and Figure 5 is an operating state of the manual transmission shown in Figure 4. FIG. 6 is a sectional view of a main part showing another embodiment of the present invention. 1...Manual transmission, 2...Input shaft, 5...Counter shaft, 9...Counter 5th gear, 10...Counter reverse gear,
11...Output shaft (spindle), 15...
...5-speed main gear (shift gear), 18... Synchronous mesh mechanism (synchronizer), 19... Reverse gear, 20... Reverse idler gear, 22...
...Striking rod, 50...Cone part,
55... pressure contact surface, 56... taper part (pressing surface),
63... Pressing piece, C... Pressing member.

Claims (1)

[Claims for Utility Model Registration] One of the forward positions is disposed opposite to the reverse position in the shift direction, and the transmission gear of the forward position is rotatably fitted to the support shaft thereof, and the transmission gear is connected to the reverse position. In a manual transmission in which a synchronizing device is provided between a support shaft and a synchronizing action by the synchronizing device is performed by axial movement of a striking rod, the side of the speed change gear where the synchronizing device is provided and On the opposite side, a cone portion is integrally formed from the speed change gear and concentric with the support shaft, and a pressing member that can be pressed against the entire circumference of the cone portion is provided opposite to the cone portion in the shift direction. , the pressing member is attached to the support shaft so as to be movable in the axial direction and integrally locked in the rotational direction, and a pressing surface is formed on the pressing member on a side opposite to the opposite side of the cone portion, A manual transmission characterized in that the striking rod is provided with a pressing piece that comes into contact with the pressing surface.