JPS6222892Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a gear shift gear that is slidably fitted on a shift shaft, and which is slidably moved by a shift operation part (shift fork). The present invention relates to a transmission having a structure in which the gears are selectively engaged with each other, and particularly relates to a transmission in which the above-mentioned transmission operation section is improved.

(B) Prior art A gear sliding selection type transmission has a shift gear slidably fitted onto a shift shaft supported by a transmission case, and a shift fork that engages with a fork fitting groove of the shift gear. is pivotally supported on a transmission case, and the shift gear is slidably moved on the shift shaft by the swinging operation of the shift fork. If the structure is such that it is supported on both sides of the transmission case, it will be more robust, and if the operating lever for operating the shift fork can be attached to either side of the transmission case, the freedom of installation of the transmission will be increased. This increases the usability, improves mass productivity, and lowers production costs. Conventional examples that satisfy these requirements include, for example, British Patent No. 1170987 and Utility Model Application No. 101778/1983. something exists.

(c) Problems to be solved by the invention In the former of the above-mentioned conventional examples, the support shaft of the shift fork is supported on both sides of the transmission case side walls, and both ends of the fork support shaft are supported on the transmission case side walls. It is configured so that the operating lever for operating the shift fork is fitted and connected to either of the two protruding parts of the projecting part, making the support sturdy due to the double-supported structure, and making it easier to install the operating lever. Although it has become possible to increase the degree of freedom, the structure in which the fork bearing shaft is supported by the mission case wall itself, and the support span is long, causes deflection and twisting during operation. There is a drawback that smooth operation is hindered, and furthermore, the protruding part of the fork support shaft remains largely protruding outward on the side where the operating lever is not attached, so this remaining protruding part may prevent the transmission case from being attached to the equipment or the like. There are also some drawbacks that may pose an obstacle when incorporating it into a machine. In addition, in the latter conventional example, the operation lever is only mounted on one side of the transmission case, and the support span of the fork support shaft is long like the former, which causes flexing and twisting during operation. The difficulties remain.

Therefore, the present invention has been implemented with the aim of providing a speed change operation device that solves the above-mentioned difficulties of the conventional example.

(d) Means for Solving Problems In order to achieve the above object, the present invention provides fork shafts 8, 8 that are perpendicular to the speed change shaft 5 on which the speed change gear 6 is slidably fitted. , the speed change gear 6
The shaft ends of the fork shafts 8, 8 are positioned near the inner surfaces of the side walls 9, 9 of the transmission case 2, and the respective shaft ends are The parts are internally fitted and pivoted into housings 12, 12 which are removably installed on the side walls 9, 9 of the transmission case, and the ends of each fork shaft are pulled out from the housings 12, 12 on the outside of the part where they are fitted and pivoted. The inner ends of the lever shafts 10, 10' to which the lever shafts 10 and 10' are fixedly fitted are formed into rotational force transmission coupling parts, and the respective rotational force transmission coupling parts are inserted and coupled into the central female holes bored in the axial center of each end of the fork shaft. One lever shaft 10 has a length that projects outward from the housing to form an outwardly projecting portion on the mounting portion of the operating lever 11, and the other lever shaft 10' has a length that does not project outward from the housing. A housing whose outer end is closed by a blind lid 13 fixed to the housing, and which pivotally supports a lever shaft 10 having an operating lever mounting portion;
A housing that pivotally supports a lever shaft 10' that does not have an operation lever attachment part is attached to both side walls 9, 9 of the transmission case.
This gear shift operating device is characterized in that it can be installed interchangeably with the other gears.

(E) Function In the speed change operating device of the present invention having the above-mentioned configuration, the fork shafts 8, 8 extending from the fork portion 7 on both sides are supported by the housings 12, 12, so that the entire structure is supported on both sides. The supporting parts of each fork shaft 8, 8 are supported by the transmission case side wall 9,
Since the support span is shortened since the shift fork is located inward from the shift fork, there is no bending or twisting when the shift fork is operated, and the shift operation is performed smoothly.

The fork shafts 8, 8 and the joints between the fork shafts and the lever shafts 10, 10' are all located inside the transmission case 2 and are lubricated by the lubricating oil inside the case, so the rotating parts are subject to wear and tear. This prevents corrosion and rust, improving operability and durability.Furthermore, the lever shaft 10 with the operating lever attachment
The housing that supports the lever shaft 10' and the housing that supports the lever shaft 10' that does not have an operating lever mounting part can be installed interchangeably on both side walls of the transmission case. Operation lever 1 from above
1 is selectively mounted on either side of the mission case, no protrusions remain on the non-mounted side of the operation lever, and there is no problem when installing the mission.

(f) Examples Next, specific examples of the present invention will be explained based on the attached drawings.

The mission 1 is housed in a closed box-shaped mission case 2.

The transmission case 2 is equipped with a gear transmission mechanism consisting of various gears and shaft groups, and the main parts shown at the broken points in the figure will be explained below.

A gear 4 is fixed to one shaft 3, and a transmission gear 6, which can mesh with the gear 4, is fitted to the other transmission shaft 5 so as to be slidable relative to the same shaft 5.

A speed change operation member is engaged with the speed change gear 6 so as not to inhibit the rotation of the speed change gear 6, and the speed change gear 6 is slidably moved on the speed change shaft 5 by operating the speed change operation member. It is made so that it can be done.

The speed change operation member is formed of a fork portion 7 that fits into and engages a fork groove of the speed change gear 6, and fork shafts 8, 8 that extend integrally from both sides of the fork portion 7.

The fork portion 7 and the fork shafts 8, 8 are provided in a direction perpendicular to the speed change shaft 5.

Further, each of the fork shafts 8, 8 is provided with a length such that each shaft end is located inside the inner surface of the both side walls 9, 9 of the mission case 2 and near the inner surface of the said both side walls. fork shaft 8,8
A central female hole is bored at a predetermined depth in the end portion of the lever shaft 10, through which the inner end portion of a lever shaft 10 (to be described later) is inserted and coupled in a state in which rotational force can be transmitted.

On the other hand, opposing concentric shaft holes are formed at predetermined locations on both side walls 9, 9 of the mission case 2.
2 is inserted and fixed.

A center hole into which the fork shaft 8 is rotatably fitted is formed in the protruding portion of each housing 12 into the mission case 2, and a center hole in which the fork shaft 8 is rotatably fitted is formed in the housing shaft center portion outward from the bottom of the center hole. In this case, a lever shaft insertion hole having a diameter slightly smaller than the center hole is continuously bored.

The lever shaft 10 is rotatably fitted and supported in the lever shaft insertion hole of the housing 12, and a central hole in the axial direction of the lever shaft 10 is provided with a center hole into which the fork shaft is inserted. A flange is provided that fits into the hole and abuts on the bottom of the hole, and the end inside the flange is formed into a coupling part that fits into the central female hole of the lever shaft 10 and is capable of transmitting rotational force, Also,
A portion projecting outward from the side wall of the mission case 2 is formed as an operating lever fitting portion, to which the operating lever 11 can be detachably connected and fixed.

It should be noted that the lever shaft 10, which is provided with an operation lever fitting portion that protrudes outward from the side wall of the mission case 2, can be replaced and installed so as to support only one of the two fork shafts 8, 8. The remaining fork shaft is supported by a lever shaft 10' that does not have an operating lever fitting part and is formed to a length that does not protrude from the housing 12.A blind cover 13 is provided on the outer end surface of the housing 12. It must be worn. The only difference between the lever shaft 10' and the lever shaft 10 is whether or not there is an operation lever fitting portion projecting outward from the side wall of the mission case, and the other structures are the same.

Reference numeral 13' in the figure is a lid body fixed to the outer end surface of the housing 12 on the lever shaft 10 mounting side where the operating lever fitting portion is located, 14 is a remote control wire connected to the operating lever, 15, 15 is the inset piece of the fork part.

In the transmission using the speed change operation section configured as described above, the fork shafts 8, 8, which are connected to each other on both sides of the fork section 7, are supported by the housings 12, 12, so that the whole is supported on both sides. Moreover, the support span of each fork shaft 8 is shortened because the fork shafts 8, 8 are supported at a portion that is deeper inside than both side walls of the transmission case. Therefore, by supporting the entire shift fork with a double-sided structure with a short support span, there is no bending or twisting when the shift fork operates, and the shift fork can operate extremely smoothly and easily. It is. And fork axis 8,
8 and the joints between the fork shafts 8, 8 and the lever shafts 10, 10' are all inside the transmission case 2 and are constantly lubricated by the lubricating oil inside the transmission case. This prevents wear and tear and rust on moving parts, improving operability and durability.

Furthermore, the end of the fork shaft on the side to which the operating lever 11 is not connected is supported by the lever shaft 10' which does not have an operating lever attachment part, and the outside thereof is closed by a blind cover 13, so that the end part of the fork shaft on the side where the operating lever 11 is not connected is supported by the lever shaft 10' without the operating lever mounting part, and the outside thereof is closed by the blind cover 13. If the operating lever is selectively mounted on either side of the transmission case to suit the overall arrangement of the machine, there will be no protrusion on the other side, making it easy to use in the limited space of the device or machine. It does not become an obstacle when the transmission case is assembled into the machine, and it becomes more convenient in terms of the layout and configuration of the machine as a whole.

(G) Effects of the invention The invention has the fork shafts 8, 8 extending from the fork part 7 to both sides, to the transmission case side wall 9,
The housing 1 is provided with a length such that the shaft end is located near the inner surface of the housing 1, and the shaft end of each fork shaft is detachably attached to the transmission case side wall 9.
2, 12, and the lever shafts 10, 10' are fixedly fitted to the housings 12, 12 on the outside of the internally fitted pivot parts of the fork shafts. The respective rotational force transmission coupling parts are inserted and coupled into the central female holes bored in the shaft centers of the respective ends of the fork shafts, and one lever shaft 10 has a length that projects outward from the housing to form an outwardly projecting part. is formed in the mounting portion of the operating lever 11, and the other lever shaft 10' has a length that does not protrude outward from the housing, and its outer end is closed with a blind cover 13 fixed to the housing. Since the gear shift operating device is constructed in such a way that the housing supporting the lever shaft 10 with the operating lever mounting portion and the lever shaft 10' without the operating lever mounting portion can be installed and replaced with each other, the following advantages are achieved. There is.

Fork shafts 8, 8 extending from the fork portion 7 to both sides are attached to both side walls 9, 9 of the transmission case 2.
The shift fork is supported internally by the housings 12, 12 at the portions that enter into the case from the inner surface of the shift fork, and the entire shift fork is supported by a short-span double-sided structure, which prevents bending or twisting during operation. This eliminates the need for smooth and light shifting.

The fork shafts 8, 8 and the joints between these shafts and the lever shafts 10, 10' are all located inside the transmission case 2 and are constantly lubricated by the lubricating oil inside the case 2. This prevents wear and rust on the fitting and rotating parts, and significantly improves the operability and durability of the device.

A housing 12 that supports a lever shaft 10 with an operating lever mounting portion, and the other lever shaft 10'
By removing the housing 12 that supports the housing 12 and replacing it alternately, the operating lever 11 mounting portion can be positioned on either side of the transmission case. The position of the operating lever connecting part can be changed relatively easily even though the operating lever is supported in both directions. In addition, the lever shaft 10'
does not protrude from the housing 12, but has a structure in which the outside of its shaft end is closed by the blind cover 13, so that no matter which side of the transmission case 2 the operating lever 11 is disposed on, there is no protruding part on the other side. Therefore, it does not become an obstacle to incorporating the transmission into equipment or machinery.

[Brief explanation of the drawing]

The drawing shows a specific example of the present invention, and is a partially cutaway side view of a transmission according to the present invention. 2...Mission case, 5...Transmission shaft, 6...
...speed gear, 7... fork part, 8, 8... fork shaft, 9, 9... side wall of transmission case, 1
0,10'...Lever shaft, 11...Operation lever,
12, 12...Housing, 13...Blind lid.

Claims (1)

[Scope of utility model registration request] Fork shafts 8, 8 extending perpendicularly to the transmission shaft 5 on which the transmission gear 6 is slidably fitted are extended from the base of the fork portion 7 that engages with the fitting groove of the transmission gear 6 on both sides. , a housing in which the shaft end portions of each fork shaft 8, 8 are located near the inner surfaces of both side walls 9, 9 of the mission case 2, and each shaft end portion is removably installed on the side walls 9, 9 of the mission case 2; 1
2 and 12, and the housing 1 is located outwardly from the portion where each end of each fork shaft is fitted and pivotally supported.
Lever shafts 10 and 10' that are fitted onto 2 and 12 to prevent them from coming off.
The inner ends of the lever shafts 10 are formed into rotational force transmission coupling parts, and the respective rotational force transmission coupling parts are inserted and coupled into the central female holes bored in the shaft centers of the respective ends of the fork shafts, and one lever shaft 10 is connected to the outside of the housing. An outwardly protruding portion is formed on the operating lever 11 attachment portion with a length that protrudes from the housing, and the other lever shaft 10' has a length that does not protrude outward from the housing, and its outer end is fixed to the housing. A housing that is closed with a blind lid 13 and pivotally supports a lever shaft 10 with a control lever mounting portion, and a lever shaft 1 without a control lever mounting portion.
0' and a housing in which the gear shifter 0' is pivotally supported can be attached to the side walls 9, 9 of the transmission case 2 in an interchangeable manner.