KR100391643B1 - Reverse-idle-gear - Google Patents

Abstract

The present invention is to achieve a smooth shift feeling by smoothly operating the reverse idler gear during the reverse shift of the manual transmission, the reverse idle gear is moved on the reverse idle gear shaft to connect the reverse gear and reverse driven gear to the reverse shift state. In the manual transmission, the first gear is rotatably inserted into the reverse idler gear shaft and is engaged with the reverse gear, and the second gear is splined to the first gear and engaged with the reverse driven gear. The spline coupling of the first gear and the second gear is composed of a reverse idler gear formed with a clearance of a predetermined gear pitch, thereby easily reversed to the reverse gear as well as the reverse driven gear. As the idle gears can rotate, the gears are out of phase, And the operation to obtain a smooth shift operation feeling by a so eliminate the reverse phenomenon that smooth speed change operation made difficult, there is an effect that it is possible to prevent the reverse breakdown of the transmission operating mechanism by excessive operation.

Description

Reverse Kids Gears {REVERSE-IDLE-GEAR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual transmission of an automobile, and more particularly, to a reverse idler gear of a manual transmission in which a smooth shifting feeling is obtained by smoothly operating the reverse idler gear during reverse shifting.

The transmission is installed between the engine and the front wheel differential gear in the case of the front wheel drive type, and is installed between the engine and the propulsion shaft in the case of the rear wheel drive type, and the engine rotational speed and speed are changed to the driving state of the vehicle and transmitted to the driving wheel. The apparatus is classified into a manual transmission, an automatic transmission, a continuously variable transmission, and the like according to the operation method thereof.

In this case, the manual transmission is provided with a multi-stage shift stage to provide a shift stage that is closest to the driving state of the vehicle. However, there is a disadvantage in that each shift stage is distinguished and an operation is inconvenient. It is still widely used in spite of the generalization of automatic transmission or continuously variable transmission because of its low failure rate and low cost.

As a representative type of such a manual transmission, a synchronous-type transmission is used, which includes a transmission gear and a clutch gear assembly for implementing a plurality of shift stages, and a synchro mesh mechanism for switching the engagement state between the selected clutch gear assembly, A shift rail device for selectively operating the synchro mesh mechanism in accordance with the operation of the shift lever.

That is, in the two-axis transmission shown in FIG. 1, an input shaft 50 that receives rotational force from the engine through the clutch is provided in parallel with the output shaft 52, and the first shaft 50 has a first speed. A transmission gear 54, a reverse gear 56, and a second speed gear 58 are provided, and the output shaft 52 has a third speed gear 60, a fourth speed gear 62, and a fifth speed gear. A speed change gear 64 is provided, and the third speed clutch assembly is rotatable with respect to the input shaft 50 while being engaged with each transmission gear 66 of the output shaft 52 on the input shaft 50. 68 and the fourth speed clutch assembly 70 and the fifth speed clutch assembly 72 are installed, and at the same time, these clutch gear assemblies 74 can be directly connected to the input shaft 50. A mesh mechanism 76 and a five-stage synchro mesh mechanism 78 are provided.

In addition, the output shaft 52 is engaged with the first speed gear 54 and the second speed gear 58, respectively, and the first speed clutch gear assembly 80 and the second are rotated with respect to the output shaft. The fast clutch gear assembly 82 is provided, and the 1-2 stage single mesh mechanism 84 which connects these clutch gear assemblies 74 directly to the output shaft 52 is provided, and the output shaft 52 is a differential gear apparatus. It is connected to (86) to transmit the shifted rotational force to the axle.

Here, the synchromesh mechanism 88 may include a hub 90 coupled to rotate together with the input shaft 50 or the output shaft 52, a sleeve 92 splined to the hub 90, and the respective angles. A synchronizer ring 94 installed to be conically coupled to the clutch gear assembly 74 of the gear shift stage, and installed between the sleeve 92 and the hub 90 to connect the synchronizer ring 94 to the clutch gear assembly. Conical clutch which is composed of a key 96 and the like to push toward the 74, the clutch gear assembly 74 is coupled to the transmission gear portion meshed with the transmission gear 66 and the synchronizer ring 94. The clutch gear portion to which the portion and the sleeve 92 are coupled are integrally formed together.

In particular, a reverse-driven gear 98 is formed on the outer circumferential surface of the sleeve 92 of the 1-2-speed synchro mesh mechanism 84 for reverse shifting of the vehicle, and the reverse idler gear (not shown in FIG. 1) reverses the input shaft. It is adapted to be connected to the gear 56.

In the shifting operation of the transmission configured as described above, when the driver selects a shift rail in which a shift lever operation is not shown and linearly moves the shift fork installed on the shift rail, the sleeve 92 of the synchro mesh mechanism 88 is moved. Sleeve 92 moves key 96 while sliding in hub 90 to provide pressure to synchronizer ring 94, which synchronizes clutch gear assembly 74 and cone at that pressure. While being engaged in a clutch state, the hub 90 and the clutch gear assembly 74 offset and synchronize with each other.

When synchronized as described above, as the sleeve 92 is further moved, the clutch 92 is completely engaged with the clutch gear assembly 74 to connect the hub 90 and the clutch gear assembly 74 with gears, so that the rotational force transmitted to the input shaft 50 is selected. The gear is shifted through the clutch gear assembly 74 and the transmission gear 66 and transmitted to the output shaft 52.

Here, the reverse shift is made in detail with reference to Figures 2a to 2c, between the reverse gear 56 and the reverse drift gear 98 installed on the input shaft 50 to a separate reverse idle gear shaft 100 The reverse idler gear 102, which is perturbably installed, implements the reverse shift state, and when the reverse operation is applied in the neutral state of FIG. 2A, the reverse idler gear 102 moves to the left side, as shown in FIG. (50) is engaged with the reverse gear 56, then as shown in Fig. 2C is engaged with the reverse-driven gear 98 provided in the sleeve 92 of the 1-2-stage single-chrome mesh mechanism 84 from the input shaft (50) It is to transmit the rotational force of.

At this time, the reverse idle gear 102 is engaged with the reverse gear 56, since the reverse idle gear 102 can be freely rotated on the reverse idle gear shaft 100, so that the rotational resistance is less. Even when the teeth of the 56 and the reverse idler gear 102 do not fit well with each other, the reverse idle gear 102 is slightly rotated so that the gear is easily engaged.

However, once the reverse idle gear 102 is engaged with the reverse gear 56 as described above, the reverse idle gear 102 beats the rotational resistance of the input shaft 50 and the entire clutch by the reverse gear 56. The reverse-dried gear 98 of the sleeve 92 is not free to rotate about the output shaft 52, so that the reverse-idle gear 102 and the reverse-dried gear 98 do not fit together when they are engaged with each other. In this case, the shift operation feeling becomes poor or, if it is severe, may result in a state in which the shift operation is impossible, leading to breakage of the reverse shift operation mechanism during excessive operation.

Accordingly, the present invention has been made in order to solve the above problems, by improving the operating state of the reverse idler gear to facilitate the combination of the reverse idler gear, reverse gear and reverse drift gear during reverse shifting, The purpose is to provide a reverse idler gear that can realize a smooth shift operation feeling.

The present invention for achieving the above object, the reverse idler gear is moved on the reverse idler gear in the manual transmission to implement the reverse shift state by connecting the reverse gear and the reverse drift gear, the rotation to the reverse idler gear shaft And a second gear inserted in a linearly movable manner and engaged with the reverse gear, and a second gear coupled to the first gear with a spline and engaged with the reverse driven gear, wherein the spline of the first gear and the second gear The coupling is characterized in that the clearance is made by a predetermined gear pitch.

1 is an internal structure diagram of a general manual transmission,

2a to 2c is a state diagram showing the operating state of the reverse idler gear according to the prior art,

3a to 3c is a state diagram showing the operating state of the reverse idler gear according to the present invention,

4 is a cross-sectional view taken along the line A-A of FIG. 3A.

<Description of Symbols for Main Parts of Drawings>

1: first gear 3: second gear

5: reverse idle gear 50: input shaft

52: output shaft 56: reverse gear

84: 1-2 steps single mesh mechanism 90: Hub

92: sleeve 98: reverse driven gear

100: reverse idle gear shaft G: play

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the names and symbols of the same parts as those used in the description of the prior art will be described using the same.

3A to 3C illustrate the structure and operating state of the reverse idler gear according to the present invention, in which the reverse idler gear shaft 100 has a first gear 1 rotating and linearly moving relative to the reverse idler gear shaft. A reverse idle gear 5 made of a second gear 3 coupled to the first gear 1 and splined to the first gear 1 is fitted.

In this case, the spline-coupled state is described with reference to FIG. 4 and the clearance G is formed by a predetermined gear pitch, and the clearance G is about 1/2 gear pitch. If the clearance G is too small, the relative rotational amounts of the first gear 1 and the second gear 3 are small, making it difficult to implement a smooth shift feeling, which is an effect of the present invention. When the gear is shocked.

Referring to the operation of the present invention configured as described above are as follows.

When the shift operation force from the neutral state to the reverse state as shown in FIG. 3A is transmitted to the reverse idle gear 5 by the driver's shift lever operation, the first gear 1 of the reverse idle gear 5 is input shaft 50. The first gear (1) is a reverse idler gear when the reverse gear (56) and the first gear (1) are displaced in such a state that it is difficult to be engaged as it is. Slightly rotated on shaft 100 and begins to engage (FIG. 3B).

In this state, when the first gear 1 is continuously approached in full engagement with the reverse gear 56, the second gear 3 is then moved into the sleeve 92 of the 1-2-stage single chrome mesh mechanism 84. Is engaged with the reverse-driven gear 98 provided in the above. When the second gear 3 and the reverse-driven gear 98 are displaced in such a state that they are difficult to be engaged as they are, the second gear 3 is The first gear 1 is coupled to a spline having a clearance G so that it is rotated within the range of the clearance G so that the first gear 1 is adapted to be engaged with the reverse driven gear 98 so as to continue the reverse idle gear 5. The final movement leads to a complete engagement (FIG. 3C).

As a result, in the dual structure of the reverse idler gear 5 according to the present invention, the first gear 1 is the reverse gear of the output shaft 52 and the second gear 3 is the reverse gear 56 of the input shaft 50, respectively. The gear 98 is rotated in a state suitable for engagement with the gear 98 so as to solve the difficulty of gear coupling caused by overlapping phases of the gears.

As described above, according to the present invention, the reverse idler gear can be rotated in a state in which it is easy to be combined with the reverse gear as well as the reverse drift gear by making the reverse idle gear into a double structure. Smooth shifting operation can be obtained by eliminating the phenomenon in which reverse shifting becomes difficult and smooth reverse shifting operation, and there is an effect of preventing damage to the reverse shifting mechanism by excessive operation.

Claims (1)

In a manual transmission that reverse reverse gear is moved on the reverse idle gear shaft to connect reverse gear and reverse driven gear to realize reverse shift state. A first gear rotatably inserted into the reverse idler gear shaft and engaged with the reverse gear, and a second gear coupled to the first gear by a spline and engaged with a reverse-dried gear; The spline coupling of the gear and the second gear is reverse idle gear, characterized in that the clearance is made by a predetermined gear pitch.