JPS6336422Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a transmission of a type in which the speed change operation is not performed by human power but by a power assist device of a pneumatic pressure response device, that is, an appropriate actuator. This invention relates to an improvement of a device for commanding an actuator.

In heavy vehicles such as large trucks and buses, a large amount of operating force is originally required to operate the transmission, and on the other hand, the number of gears has increased in order to improve fuel efficiency, and the driver has to operate the transmission with great precision and precision. Since the driver no longer has to perform a gear shifting operation, the physical and mental burden on the driver tends to increase. Therefore, in order to reduce driver fatigue and improve vehicle traffic safety, transmission selection and shift operations are now performed by actuators such as pressure-responsive devices using compressed air. The driver configures the
The applicant has already proposed a system in which a predetermined operation command signal is transmitted to the actuator, ie, the power assist device, to perform a speed change operation by operating the speed change control lever with an extremely light operating force. . This invention relates to an improvement of the above-mentioned power assisted transmission proposed by the present applicant.

First, an overview of the previously proposed transmission will be explained with reference to FIGS. 1 to 3. The example shown here is a transmission with five forward speeds and one reverse speed.
Reference numeral 10 denotes a rectangular plate-shaped mounting base fixed to the floor of a vehicle (not shown), 12 a rectangular frame-shaped casing assembled on the mounting base 10, and 14 a mounting base 10.
and the casing 12, and 16 is a lower cover having a spherical center portion, and 16 is an upper cover provided at the upper end opening of the casing 12, and 18 is an upper cover having a spherical center portion. , especially the first
As clearly shown in the figure, the upper cover 16 is provided with a generally "king" shaped guide groove representing a shift pattern, which extends laterally in the figure and has three select positions. _N1 , _N2 ,
A select groove 20 including _N3 , a shift groove 22a extending vertically from each select position to a shift position backward R, a shift groove 22a that limits the first gear position, a shift groove 22b that limits the second and third gear positions, a shift groove 22b that limits the fourth and third gear positions. It consists of a shift groove 22c that limits the fifth gear position. 24 is
A rotatable first shaft 26 whose both ends are supported by the casing 12 is connected to a bolt (or pin) disposed on the first shaft so that its axis is orthogonal to the axis of the first shaft 24. 28 is an operating lever pivotally supported by the second shaft 26; 30 is coaxially and removably fitted into the upper end of the operating lever 28, and is inserted into the guide groove of the upper cover 16; 32 is the operating handle 3 that protrudes to the outside through the operating handle.
The grip 34 fixed to the upper end of the operating handle 30 is a radially extending collar provided near the lower end of the operating handle 30, the upper surface of which has a spherical surface that matches the spherical inner surface of the upper cover 16; Further, its lower surface forms a receiving surface for receiving the upper end of a spring 36 that constantly presses the operating handle upward, and furthermore, the lower end of the spring 36 is supported by a shoulder on the operating lever 28. Reference numeral 38 denotes a ball housed in an axial hole provided at the lower end of the operating lever 28, and is constantly pressed downward by a spring 40. By partially fitting and rolling into the guide groove 42 cut into the lower cover 14, the select operating position of the operating lever 28 can be defined. 44 as a whole is abbreviated as U
A pair of support shafts 4 are attached to the opposing upper ends of the
It is a band-shaped arm pivotally supported on the casing 12 by 6 and 48, and the support shafts 46 and 48 are arranged coaxially with the second shaft 26.
Further, the arm 44 is provided with an elongated hole 50 in its bent portion through which the lower cylindrical portion of the operating lever 28 is inserted. However, when the operating lever 28 rotates around the second shaft 26, the lever is integrally rotated around the support shaft 4.
6, 48 to rotate. 52 is a cam having a U-shaped cross section that is slidably mounted on the second shaft 26;
The end face 54 facing the is curved in a dogleg shape. 56 is a spring that presses the cam 52 against the first shaft 24; 58 is a reaction cam 60 fixed on the first shaft 24; a rolling roller 62 that contacts the cam 60; and a spring that supports the roller 62. This is a reaction force device consisting of a plunger 64 that moves and a cylinder 66 that accommodates the plunger, and by introducing compressed air into the cylinder 66, the first shaft 24
The purpose of this is to provide a sense of operation for the rotation operation, that is, the shift operation. A select position detection switch 70 68 is operatively connected to the arm 44 and detects the rotational position of the operating lever 28 about the second axis 26, that is, the select positions N ₁ , N ₂ , N ₃ in FIG. is operatively connected to the first shaft 24 to determine the rotational position of the operating lever 28 about the first shaft, that is, for example, the second stage position, third stage position, or neutral position of the shift groove 22b in _FIG. This is a shift position detection switch that detects which of the nine positions the operating lever 28 is in on the shift pattern shown in FIG. 1 from the signals from both switches 68 and 70. can.

In the above device, the driver grasps the grip 32 and uses the handle 30 to move the operating lever 28 to the second shaft 2.
6 and move it along the select groove 20 to select any one of N ₁ , N ₂ , and N ₃ , and then rotate it around the first axis 24 and move it along the select groove 20 .
2a, 22b, and 22c, it is possible to arbitrarily specify either reverse R or 5 forward speeds, and the specified gear is determined by the cooperation of the switches 68 and 70. The signal is transmitted as an electric signal to an actuator of a transmission (not shown), so that a speed change operation of the transmission is performed. Also, as is clear from the above description, in the shift pattern 18 in FIG. 1, the select groove 20 is extended, one more select position is added to N ₄ , and from N ₄ parallel to the shift grooves 22a, 22b, and 22c. Groove 2
By extending 2d in the perpendicular direction and adding two new shift positions, a shift operation command device with seven forward speeds and one reverse speed can be obtained. (Of course, in this case, the transmission itself must be prepared as a device with seven forward speeds and one reverse speed.) In the above device, the operating lever 28 must be placed in the neutral position.
The first shaft 2 of the cam 52 applying the return force to N ₂
The end surface 54 that comes into contact with 4 has a fairly complicated curved surface.
That is, when the operating lever 28 selectively rotates around the second shaft 26 and is displaced to N ₁ and N ₃ , the cam 5
2 also rotates around the second shaft 26, the cam end surface 54 rotates around the first shaft 24 during this rotation process.
Relative displacement occurs, preferably while making line contact with the peripheral surface (point contact causes rapid wear and is inconvenient).
A complex curved surface is formed, and in the case of the seven forward speeds described above, it becomes even more complex. Therefore, in the past, machining of this end face required time and effort, and inspection to ensure accuracy was difficult, leading to high costs.

The present invention was devised in view of the above, and generates a shift signal by being operated by the driver and rotated around a first axis, and the first
an operating lever that generates a selection signal by being rotated around a second axis perpendicular to the axis;
and mounted on the second shaft so as to be able to slide in the axial direction thereof, and pressed against the side surface of the first shaft by an elastic device to generate a force for returning the operating lever to the neutral position. Press molding, comprising a cam, the cam having a substantially U-shaped base and a flange extending outward in the axial direction from the free end edge of the base, facing the circumferential surface of the first shaft. The gist of the present invention is a speed change operation command device for a speed change device, which is characterized in that it is comprised of a number of components. According to the present invention, since the cam is formed as a press-molded product, by appropriately controlling the dimensions and quality of the mold and material, it is possible to obtain a high-precision product at a low cost, and also with sufficient space. By providing the above-mentioned flange surface having the above-mentioned flange surface, it is easy to secure a contact line of sufficient length with the circumferential surface of the above-mentioned first shaft when the operating lever is rotated to select, thereby reducing wear. This makes it possible to realize a device of this type that is small, durable, and lightweight.

An embodiment of the present invention will be described in detail below with reference to FIGS. 4 to 6. Note that this example is based on the first
The gear change operation command device shown in FIGS.
This relates to a case where the device is configured as a one-stage reverse device. The cam 100 is formed by pressing a steel plate material, and includes a substantially U-shaped base 102 and a flange 1 extending outward from the free edge of the base 102.
04, 106, and these flanges correspond to the end surface 54 of the cam 52 in the apparatus shown in FIGS. 1 to 3. A hole 108 is provided in the bottom surface of the base 102, through which the second shaft 26 of the device passes. In FIG. 6, the chain line indicates the first shaft 24 of the device, and the illustrated state is when the operating lever is in the neutral position.

n ₁ −n ₁ ′, n ₂ −n ₂ ′, n ₃ − shown by chain lines in Figure 4
n ₃ ′, n ₄ −n ₄ ′ are constructed by changing the shift pattern guide groove _{18 shown} in FIG. It shows the relative position between the axis and the cam 100. As mentioned with reference to FIG. 6, in this embodiment, the select position _N3 is set to the neutral position, and therefore, the above _n3 - _n3 ' is the position of the axis of the first shaft 24 in the neutral position. The above flange 10
4 and 106 are the lines n ₁ −n ₁ ′,... in FIG.
At n ₄ −n ₄ ′, the outer circumferential surfaces of the first shafts 24 form complex curved surfaces that are in line contact with each other. However, if the press die is manufactured correctly and a steel plate with uniform material and excellent thickness accuracy is used, the cam 100 as a press product can be mass-produced with sufficient accuracy, and compared to the conventional method. The cost is much lower than that of machined products, and there are no extra thick parts, so it can be made lightweight. In addition, in the case of the device with five forward stages and one backward stage illustrated in FIGS. 1 to 3, the cam flanges 104, 10
Since the shape of 6 is of course simpler than that of the above embodiment, the production of the press mold becomes easier.

As described above, the gear shift operation command device according to the present invention is operated by the driver and rotated around the first axis to generate a shift signal,
an operating lever that generates a selection signal by rotating around a second axis perpendicular to the first axis; and an operating lever mounted on the second axis so as to be slidable in the axial direction thereof; The above-mentioned first
a cam that is pressed against the side surface of the shaft to generate a force for returning the operating lever to the neutral position;
The cam is comprised of a press-molded product having a substantially U-shaped base and a flange extending outward in the axial direction from the free edge of the base, facing the circumferential surface of the first shaft. This is extremely advantageous because it is possible to provide a device of this type that is inexpensive, lightweight, and equipped with a high-precision cam.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a speed change operation command device previously proposed by the present applicant, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line - in FIG. FIG. 4 is a front view of a cam 100 according to the present invention, which corresponds to the cam 52 in the apparatus shown in FIGS. 1 to 3, FIG. 5 is a plan view of the cam of FIG. 4, and FIG. be. 24...First axis, 100...Cam, 26...Second axis, 102...Base, 28...Operation lever, 1
04,106...Flange, 52...Cam, 10
8...hole, 54...cam end face.

Claims (1)

[Scope of utility model registration request] It is operated by the driver to generate a shift signal by being rotated around a first axis, and to generate a select signal by being rotated around a second axis perpendicular to the first axis. The operating lever is mounted on the second shaft so as to be able to slide in the axial direction thereof, and is pressed against the side surface of the first shaft by an elastic device to apply a force to return the operating lever to the neutral position. The cam includes a substantially U-shaped base, and a flange extending outward in the axial direction from the free end of the base, facing the circumferential surface of the first shaft. What is claimed is: 1. A speed change operation command device for a transmission device, characterized in that it is constructed from a press-molded product having: