JPH0515648Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a gear type transmission for an automobile, and particularly to a mechanism for positioning a control rod in the transmission to a neutral position in the rotational direction, that is, a change lever to a neutral position. .

(Prior Art) In general, gear type transmissions for automobiles are known as
A plurality of sets of gear trains are disposed between the output shafts, and a plurality of shift rods are selectively operated by operating a change lever.Selective operation of the shift rods causes one of the above-mentioned gears to be shifted via a shift fork and a synchronizer. One of them is configured to be in a power transmission state. On the other hand, when the change lever is located at the rear of the transmission, a control rod may be interposed between the change lever and the shift rod. In other words, a control rod extending in the longitudinal direction is arranged between a plurality of shift rods located at the front of the transmission and a change lever located at the rear, and the rear end of the control rod and the lower end of the change lever A gate mechanism is provided between the front end of the control rod and the rear end of each shift rod, and the control rod can be rotated and moved back and forth by operating the change lever. By operating the gate mechanism, one of the shift rods is operated via the gate mechanism.

By the way, this type of gear type transmission is equipped with a spring mechanism for holding the change lever at a neutral position. This spring mechanism A is connected to the transmission B, for example, as shown in FIG.
is arranged so as to straddle the engagement mechanism E between the change lever C and the control rod D at the rear of the
One end F' of the spring F wound around the rear end of the rod D is secured to an engaging member on the rod D side, and the other end F'' is secured to the lower end of the change lever C. , when the change lever C is returned to the neutral position from the first or second gear position, the lever C is urged in the direction b in the figure by the spring force of the spring F, and is returned to the neutral position. When the change lever C is returned to the neutral position from the reverse or fifth gear position, it is similarly urged in the direction a while being returned to the neutral position.

(Problems to be solved by the invention) However, in the spring mechanism A configured as described above, the spring F must be installed across the control rod D and the change lever C, and the working space is limited. The narrowness makes the assembly work troublesome and difficult, and not only the shape of the spring F but also the structure of the spring mechanism A becomes complicated. Furthermore, since the shape of the spring F is not symmetrical, as is clear from FIG. Otherwise, there is a problem that the control rod D cannot be held in the neutral position with high precision.

Therefore, the present invention is a spring mechanism of this type that has a simple structure and can be used in the left and right directions (directions a and b in Fig. 5).
It is an object of the present invention to realize a spring mechanism in which the biasing force against the change lever is uniform, to improve the assemblability of the mechanism, and to accurately hold a change lever in a neutral position.

(Means for Solving the Problems) The gear type transmission according to the present invention is characterized in that it is configured as follows in order to achieve the above object.

That is, in a configuration in which a plurality of shift rods are selectively operated via a control rod that is rotated and moved back and forth by the operation of a change lever,
A protrusion projecting upward is provided at a predetermined position of the control rod, and an opening is provided at a portion corresponding to the protrusion on the upper surface of the extension housing in which the control rod is housed;
Further, abutment portions having predetermined dimensions in the front-rear direction are provided symmetrically, and these abutment portions elastically abut the protrusion from both sides, thereby keeping the control rod neutral in its rotational direction. The leaf spring member held in position is fitted into the opening so as not to move inside the opening, and a cap member is fixed to the extension housing to cover the opening and prevent the leaf spring member from coming off. do.

(Function) According to the above configuration, when the change lever is operated from a predetermined gear position to the neutral position, the control rod connected to the lever via the engagement mechanism is rotated to the neutral position. returned to position. In this case, the control rod is provided with a protrusion, and the abutment portions of the leaf spring member provided symmetrically on both sides of the protrusion are resiliently abutted, so that the control rod is The action of this leaf spring member allows it to be accurately held at the neutral position. In other words, by bringing the leaf spring members into even contact with both sides of the protrusion, it becomes possible to equalize the biasing force applied to the protrusion from both sides (left and right). , when operating from the 2nd gear position to the neutral position, and when operating from the reverse or 5th gear position to the neutral position, for example, the neutral position is reliably and accurately reached with the same biasing force and the same stroke. It will be returned.

Further, the above-mentioned leaf spring member is fitted into an opening formed in the extension housing corresponding to the protrusion of the control rod so that it does not move, and is prevented from coming out from the opening by a cap member covering the opening. Since the plate spring member is prevented from being blocked, the assembly of the leaf spring member only requires fitting it into the opening and attaching the cap member, thereby facilitating the assembly work.

(Example) Examples of the present invention will be described below.

First, the overall configuration of the gear type transmission according to this embodiment will be explained with reference to FIG. 1. This gear type transmission 1
An input shaft 2 connected to an engine output shaft (not shown) via a clutch, an output shaft 3 arranged concentrically behind the input shaft 2 and connected to the drive wheels of the vehicle, and the output shaft A counter shaft 4 is arranged parallel to the front lower part of the transmission case 3, and these are rotatably supported within a mission case 5 or an extension housing 6 connected to the rear of the case 5. The counter shaft 4 is
The input gear 7, which is integrally provided at the front end, is meshed with the drive gear 8, which is integrally provided at the rear end of the input shaft 2, so that it always rotates in conjunction with the rotation of the input shaft 2. It's becoming like that.

Also, between the counter shaft 4 and the output shaft 3, from the front, a third gear train 13, a second gear train 12, a first gear train 11, and a fifth gear train 15 (overdrive) are arranged. and a reverse gear train 16. Among these gear trains, the 1st to 3rd speed gear trains 11, 12, and 13 all include a 1st speed first gear 11 ₁ that is integrally provided on the counter shaft 4,
2nd speed first gear 12 ₁ , 3rd speed first gear 13 ₁ ,
A second gear 11 ₂ for first speed, a second gear 12 2 for second speed, and a second gear 12 ₂ for third speed, which are rotatably fitted to the output shaft 3 and meshed with the respective first gears 11 ₁ , _{12 1 ,} 13 1 . Second
It consists of gears 13 and ₂ . The 5th speed gear train 15 includes a 5th speed first gear 15 ₁ which is rotatably fitted to the counter shaft 4, and which is spline fitted to the output shaft 3 so as to rotate integrally with the output shaft 3. 5th speed second gear 15 ₂ meshed with first gear 15 ₁
It is made up of. In addition, reverse gear train 1
6 is a reverse first gear 16 1 rotatably fitted to the counter shaft 4; an idle gear 16 ₃ rotatably fitted to the idle shaft 17 and meshed with _the first gear 16 ₁ ; The second reverse gear 16 ₂ is spline-fitted to the output shaft 3 and meshed with the idle gear 16 ₃ .

These gears rotatable with respect to the output shaft 3 are selectively connected between the first speed second gear 11 ₂ and the second speed second gear 12 ₂ on the output shaft 3. A first synchronizer 21 for 1st and 2nd speeds to be engaged with the output shaft 3 is disposed, and a second gear 13 ₂ for 3rd speed that is rotatable with respect to the output shaft 3 is disposed at the front end of the output shaft 3. a second synchronizer 2 for third and fourth speeds coupled to the shaft 3 or directly connecting the input shaft 2 and output shaft 3;
2 is placed. Furthermore, between the 5th speed first gear 15 ₁ and the reverse first gear 16 ₁ on the counter shaft 4, these gears rotatable with respect to the counter shaft 4 are selectively connected to the shaft 4. A third synchronizer 23 for coupling is arranged.

These synchronizers 21, 22, and 23 all have the same configuration, and include clutch hubs 21a, 22 that rotate integrally with the output shaft 3 or counter shaft 4.
a, 23a, clutch hub sleeves 21b, 22b, 23b spline-fitted onto these hubs so as to be slidable back and forth, and clutch gears 21c, 21d, 22c, which are respectively meshed with the sleeves when these sleeves slide. 22d, 23
c, 23d, etc. Then, by sliding the sleeve 21b of the first synchronizer 21 backward, the second gear 11 ₂ for first speed is connected to the output shaft 3, and by sliding it forward, the second gear 12 ₂ for second speed is connected to the output shaft 3. 2 Sleeve 22 of synchronizer 22
2nd gear 13 for 3rd speed by sliding rearward of b.
₂ is coupled to the output shaft 3, and the sleeve 2
By sliding the sleeve 2b forward, the input shaft 2 and the output shaft 3 are directly connected, and by sliding the sleeve 23b of the third synchronizer 23 forward, the 5th speed first gear 15 ₁ is connected, and by sliding it backward, the input shaft 2 and the output shaft 3 are connected directly. The first gears 16 ₁ are connected to the counter shaft 4, respectively.

On the other hand, the rear end of the extension housing 6 is provided with a change lever 30, and the upper part of the housing 6 is provided with a control rod 34 extending from below the change lever 30 to the front. Also, mission case 5
At the top of the screen are first, second and third shift rods 31,
32 and 33 are arranged parallel to each other in the front-rear direction (see FIG. 2). An engaging member 35 is fixed to the rear end of the control rod 34, and a distal end of a portion of the change lever 30 extending downward from the spherical bearing portion 30a is located in a recess 35a formed in the member 35. 30b is fitted and engaged, so that the control rod 34 rotates and moves back and forth in conjunction with the horizontal select operation and vertical shift operation of the change lever 30. Also, the front end of this control rod 34 and the first to third shift rods 3 are connected to each other.
An engaging member 36 on the control rod 34 side and first to third engaged members 3 on each shift rod 31, 32, 33 are provided between the rear end portions of the shift rods 31, 32, and 33.
7, 38, and 39 is provided, and when the control rod 34 rotates, the engaging member 36 at the front end of the gate mechanism 40 engages any of the engaged members 37, 38, and 39 at the rear end of each shift rod. control rod 34 selectively engaged with one of the control rods 34;
and the selected shift rod move back and forth in unison.

Furthermore, first and second shift forks 41 and 42 are fixed to predetermined positions of the first and second shift rods 31 and 32, and these shift forks 41 and 42 are connected to the first and second synchronizers 21 , 22 clutch hub sleeve 2
1b, 22b, and when the first and second shift rods 31, 32 move back and forth, these clutch hub sleeves 21b, 22b are moved forward or backward via the first and second shift forks 41, 42. It's starting to slide towards. Further, as shown in FIG. 2, the engaged member 39 at the rear end of the third shift rod 33 has a pair of protrusions 3 that protrude laterally.
9a and 39a, and a reversing lever 4 which is swingable in a vertical plane via a fulcrum pin 44 is provided on the inside of the rear side surface of the mission case 5.
5, and the upper end of the lever 45 is engaged between the protrusions 39a, 39a of the engaged member 39. The lower end of the reversing lever 45 is engaged with a third shift fork 43 that is supported on a support shaft 46 so as to be movable back and forth and that is fitted around the outer periphery of the clutch hub sleeve 23b of the third synchronizer 23. As a result, the reversing lever 45 and the third shift fork 4 are moved forward and backward by the third shift rod 33.
3, the clutch hub sleeve 23b of the third synchronizer 23 is slid rearward or forward.

However, this transmission 1 is provided with a chamber 50 at a position in front of the change lever 30 at the upper part of the extension housing 6, and within the chamber 50, the control rod 34 is placed in a neutral position in the rotational direction. A spring mechanism 51 for holding is provided. Incidentally, the upper part of the chamber 50 has a cap member 5 fixed to the extension housing 6 using bolts 52...52.
It is sealed by 3.

As shown in FIGS. 3 and 4, the spring mechanism 51 is mounted at a predetermined position in the middle of the control rod 34 so that the tip portion covered by the nylon cap 54 protrudes upward at a substantially central position of the chamber 50. a pin member 55 screwed onto the chamber 5;
The plate spring member 56 is housed in the 0 and bent so that both sides thereof are positioned inward by a predetermined distance L in the front-rear direction. In that case,
The inwardly bent portions of the leaf spring member 56 are first and second contact portions 56 ₁ and 56 ₂ that resiliently abut on both sides of the tip end of the pin member 55, respectively. Both are molded symmetrically with respect to the pin member 55. When the change lever 30 is operated to the 1st or 2nd speed position,
The first contact portion 56 of the leaf spring member 56 is rotated and moved back and forth to positions F ₁ and F ₂ corresponding to the 1st and 2nd speeds shown by the chain lines in the same figure.
₁ is pushed against the spring force, and when the lever 30 is operated to the reverse and 5th speed positions, the pin member 55 moves to the positions F _r , which correspond to the reverse and 5th speeds, as indicated by chain lines in the figure. By rotating and moving back and forth up to F ₅ , the second contact portion 56 ₂ of the leaf spring member 56 is pushed against the spring force. Further, when the change lever 30 is operated to the 3rd and 4th speed positions and the neutral position, it is moved back and forth to positions F ₃ , F ₄ and F _o corresponding to the 3rd and 4th speeds and neutral, and the leaf spring member 56
The pin member 55 is held by the first and second contact portions 56 ₁ and 56 ₂ from both sides thereof with equal biasing force. Here, the leaf spring member 56 is housed in the chamber 50 in a state in which it is fitted so as not to move with respect to the inner circumferential surface thereof, and is held in place by a cap member 53 that covers the upper part of the chamber 50. It is designed to prevent it from coming off the chamber 50.

Next, to explain the operation of the above embodiment, when the change lever 30 is operated, the pin member 55 of the control rod 34 shifts to the first or second gear as shown in FIG.
When the pin member 55 is returned from the positions F ₁ and F ₂ corresponding to the speed to the neutral position F _o corresponding to the neutral position, the pin member 55 is moved to the above position while receiving the spring force of the first contact portion 56 ₁ of the plate spring member 56. After returning to the neutral position F _o , both the first and second contact portions 56 ₁ , 56 ₂
accurately neutral position F _o
is maintained. Furthermore, when the pin member 55 is returned to the neutral position F _o from the positions F ₅ , _Fr corresponding to 5th gear or reverse, while receiving the spring force of the second contact portion 56 ₂ of the leaf spring member 56 After being returned to the neutral position F _o , it is accurately held at the neutral position F _o by receiving a uniform biasing force from both the first and second contact portions 56 ₁ and 56 ₂ . The first and second contact portions 56 ₁ and 56 ₂ of the leaf spring member 56 are, respectively,
The pin member 55 has a symmetrical shape with respect to the pin member 55, and the spring force acting on the pin member 55 from both abutting portions 56 ₁ and 56 ₂ is made uniform, so that the pin member 55 is in the 1st and 2nd speeds. The operation can be performed under the same conditions when returning to the neutral position F _o from positions F ₁ and F ₂ and when returning to the neutral position F _o from 5th gear and reverse positions F ₅ and _Fr. become. Thereby, variations in the above-mentioned operating states due to the operation of the change lever 30 are suppressed as much as possible, and it becomes possible to hold the control rod 34 or the change lever 30 in the neutral position with high accuracy.

Further, the leaf spring member 56 has first and second contact portions 56 ₁ and 56 ₂ on both sides that are connected to the control rod 34 .
The cap member 5 is fitted into the chamber 50 so as to come into contact with the pin members 55 of the cap member 5 from both sides, respectively.
3 prevents it from coming off, so the assembly work is facilitated.

(Effects of the invention) As described above, according to the invention, the spring mechanism for holding the control rod or change lever in the neutral position is attached to the pin member protruding from the control rod and both sides of the pin member. and a plate spring member disposed symmetrically to the pin member and elastically and evenly abuts the pin member from both sides, and the plate spring member is fitted into an opening formed in the extension housing, and the upper part of the plate spring member is fitted into an opening formed in the extension housing. Since the structure is covered with a cap member, the change lever is reliably and accurately held in the neutral position when the change lever is operated to the neutral position, and the assembly work of this type of spring mechanism is facilitated. Become.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention.
Fig. 1 is an overall longitudinal sectional side view of the gear type transmission, Fig. 2 is an enlarged longitudinal sectional rear view taken along the line in Fig. 1, and Fig. 3 is an enlarged cross-sectional view of the main parts taken along the line in Fig. 1. FIG. 4 is a sectional view taken along the line of FIG. 3. Moreover, FIG. 5 shows a conventional example, and is a vertical rear view of the main part of a gear type transmission. 1...Gear type transmission, 6...Extension housing, 30...Change lever, 31-3
3...Shift rod, 34...Control rod, 50...Opening (chamber), 53...Cap member, 55...Protrusion (pin member), 56...
...Plate spring member, 56 ₁ , 56 ₂ ... Contact portion.

Claims (1)

[Scope of utility model registration request] A gear type transmission in which a plurality of shift rods are selectively operated via a control rod that is rotated and moved back and forth by the operation of a change lever, and a projection that projects upwardly at a predetermined position on the control rod. An opening is provided at a portion corresponding to the protrusion on the upper surface of the extension housing in which the control rod is housed, and the contact portion having a predetermined dimension in the front and back direction is symmetrical. A leaf spring member is provided inside the opening and holds the control rod at a neutral position in its rotational direction by elastically abutting the protrusion from both sides. A gear type transmission characterized in that a cap member is fixed to the extension housing, the cap member being fitted so as not to move and covering the opening to prevent the leaf spring member from coming off.