JP2856484B2 - Transmission operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Industrial Field of the Invention The present invention relates to a transmission operating device, and more particularly, to a vehicle body that is inclined with respect to a horizontal plane to cope with a low floor of a city bus or the like. The present invention relates to a transmission operating device to be mounted.

b. Conventional technology Conventionally, in city buses and trucks with large transmissions, operating devices with actuators and the like have been attached to the transmissions, enabling smooth selection and shift operations with light power. ing. In the above-described transmission operation device or an electronically controlled automatic transmission that remotely controls a transmission of such an automobile using an actuator or the like, a gear detection device is used to check the gear position of the transmission or to control the actuator or the like. A sensor is provided.

FIG. 7 shows a configuration of a conventional transmission operating device 1, in which two contact position or non-contact type gear position detecting sensors 2, 3 are used. The figure shows a contact sensor for simplicity.) One of the gear position detection sensors 2 is disposed near the end of the select rod 5 of the select operation actuator 4, and the other gear position detection sensor 3 is a shift operation actuator 6.
Is disposed near the end of the shift rod 7. Each of the gear position detecting sensors 2 and 3 comprises three limit switches 2a, 2b and 2c and 3a, 3b and 3c,
When the select rod 5 or the shift rod 7 is moved to a predetermined position by the operation of (1), one of the limit switches 2a, 2b, 2c and 3a, 3b, 3c is connected to the flange-like end 5a, The signal is input to the controller 9 by being pressed by 7a, and the transmission 10 is operated by the change lever 8
Is operated according to the position of. In FIG. 7, TK is an air tank, MVA, MVb, MVc, and MVd are solenoid valves, PL is a display device, and SP is an abnormality alarm device.

Here, the configuration and operation of the above-described actuators 4 and 6 will be described using the select operation actuator 4 as an example.

The actuator 4 includes a power piston 5b slidably disposed in the cylinder 4a and a pair of auxiliary pistons 5c, 5d disposed on both sides of the power piston 5b. The position of the power piston 5b shown in FIG. 7 is a neutral position.

The power piston 5b is integrated with the select rod 5, but the pair of auxiliary pistons 5c and 5d are slidably fitted between the inner peripheral surface of the cylinder 4a and the outer peripheral surface of the war piston 5b. When compressed air is supplied to and discharged from the pair of pressure chambers 11a and 11b formed on both sides of the power piston 5b through the solenoid valves MVA and MVb, the power piston
5b slides in the direction of arrow A or the direction of arrow B.

When the select rod 5 is slid by the select operation of the change lever 8 as described above, the select lever 12 directly connected to the rod 5 is moved rightward (A direction) or leftward (B direction) in FIG. moves in a direction), the end portion 13a of the shift lever 13 fixed to the shift rod 7 is adapted to be connected to any of the 14 _1, 14 _2, 14 ₃ of the shift forks 14 of the transmission 10 .

The other end portion 5e of the select rod 5, as shown in FIG. 8, is provided with a positioning mechanism 15, the position of the shift lever 13 is connected to one of the shift forks 14 _1, 14 _2, 14 ₃ Confirm. The positioning mechanism 15 includes a plurality of hemispherical holes 15a provided on the other end 5e side of the select rod 5 and a spring 15b from the housing 16 side of the operating device 1.
The steel ball urged toward the rod 5 by
Consists of 15c.

Incidentally, on the shift rod 7 side, a similar positioning mechanism is conventionally provided on the transmission side.

By the way, as shown in FIG. 9, the above-described transmission with an operating device is often connected to a large engine and attached to the rear of a large vehicle such as a city bus. In FIG. 9, 1 is the transmission operating device, 10 is a transmission, 17 is a bus,
18 is an engine and 19 is a driver's seat. In recent years, as the size of the city bus has increased, the size of the engine 18 has also been increasing. Therefore, the floor at the rear of the passenger compartment of the city bus 17 is necessarily higher than the floor at the front. . Therefore, city bus
In order to lower the floor of the transmission 17, the so-called power plant P including the engine 18 and the transmission 10 needs to be mounted at an angle.
As a result, the select rod 5 is also arranged so as to be inclined with respect to the horizontal plane.

c. Problems to be Solved by the Invention However, since the conventional transmission operating device is premised on horizontal mounting, a mechanism for preventing displacement is not provided, and therefore, when the above-described inclined arrangement configuration is employed. Causes the following problems. That is, the compressed air in the pressure chambers 11a and 11b of the actuators 4 and 6 is exhausted when the select or shift operation is completed. In this case, the shift direction does not deviate from the set position (operation completion position) due to the weight of the shift rod 7 or the vibration of the vehicle due to the mechanism of the transmission, but the shift direction does not shift due to the weight of the select rod 5 or the vibration of the vehicle. There is a possibility that the select rod 5 is shifted downward from the set position along the stroke direction.

Specifically, in the select direction, at least the select rod λ (see FIG. 8) for the play in assembly between the end 13a of the shift lever 13 and another shift fork (for example, 14 ₃ ) of the transmission 10 is selected. 5 moves. When the select rod 5 is moved, the limit switch of the gear position detecting sensor 2 which is pressed by the flange-like end portion 5a of the rod 5 and turned on is turned off, and the display device PL disappears and an erroneous display is performed. At the same time, the operating device 1 is repeatedly forced to perform a correcting operation (operation of returning to the set position) by the controller 9, thereby causing a disadvantage that the life is shortened.

In order to eliminate such inconvenience, a detent mechanism 24 including a steel ball 21, a compression coil spring 22 and an engagement groove 22 is provided to lock the select rod 5 at a predetermined position as shown in FIG. By pressing the select rod 5 against the bearing surface 25 or applying a bending force by the operation of the detent mechanism 24, the sliding resistance of the select rod 5 is increased to prevent displacement from a plurality of predetermined select positions. It is conceivable to adopt such a configuration. However, in this case, the select rod 5
Requires a large operating force, which is not practical. In order to reduce the sliding resistance of the select rod 5, a similar detent mechanism 26 may be provided at a position facing the detent mechanism 24 as shown in FIG.

By the way, in adopting the detent mechanism, in order to secure a sufficient locking force with respect to the select rod 5 and to ensure a reliable operation and high durability, a relatively large diameter steel ball (lock ball) 21 is required. Need to be used as the engagement member. However, in general, since the stroke of the select operation is short, a plurality of engagement grooves 23 corresponding to the pair of large-diameter steel balls 21 are connected to the select rod 5.
Are difficult to place at intervals along the axis.

Therefore, it is necessary to employ a detent mechanism in order to prevent the position of the select rod arranged at an inclination, but since the stroke of the select rod 5 is short,
In fact, it is desired to develop a detent mechanism that can cope with this.

The present invention has been made in view of such a situation, and its object is to be able to obtain a sufficient locking force by being able to cope with even a short stroke select rod, and to achieve a reliable operation. A transmission device operating device capable of obtaining a sufficient detent effect (an effect of preventing a shift of the select rod at a plurality of predetermined select positions) and suppressing a sliding resistance of the select rod during a stroke. To provide.

d. Means for Solving the Problems In order to achieve the above-mentioned object, according to the present invention, an engaging groove is provided on a peripheral surface of a select rod for select operation which is arranged in a state inclined with respect to a horizontal plane. In a transmission operating device configured to prevent a position shift of the select rod by fitting an engaging member constantly biased toward a peripheral surface of the select rod by a biasing unit into the engagement groove, The engaging groove is formed at two places spaced apart from each other along the axis of the select rod at a predetermined interval, and the engaging member is located at a place spaced apart from each other along the stroke direction of the select rod. And at least one of the engaging members which are arranged at opposing positions substantially 180 ° apart from each other about the axis of the select rod and are spaced apart from each other along the stroke direction of the select rod. The other is configured such that the select rod is locked at a predetermined select setting position under a state where one of the select rods rides on the peripheral surface of the select rod, and the select rod is at the lowest position with respect to the horizontal plane. In the case where the selection member is arranged at the selection setting position, all of the engagement members are set on the peripheral surface of the selection rod, and the downward displacement of the selection rod is prevented by the stopper mechanism. It is configured as follows.

Further, in the present invention, α is an arrangement interval of the engagement grooves of the select rod, β is an arrangement interval of the engagement members in the axial direction of the select rod, and an interval between adjacent select positions of the select rod. Is set to γ, α = β + γ and β> γ are satisfied.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 to FIG. 1 to 5, the same parts as those in FIGS. 7 and 8 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a sectional view of a main part on a select operation side when the transmission operating device 1 is directly connected to an engine and mounted on an upper surface of the transmission. As shown in FIG. 1, the power plant P, that is, the engine 18 and the entire transmission 10 are moved from the vertical axis II to the center of the main shaft 10a of the transmission 10 in order to reduce the floor of the vehicle, for example, the city bus. It is inclined by the angle θ. In this case, assuming that the height of the engine 18 from the center of the transmission main shaft 10a is H, the height of the engine 18 is reduced by H (1-cos θ) due to the inclination of the power plant.

Therefore, the operating device 1 mounted on the upper surface of the transmission 10
The select rod 5 on the select operation side orthogonal to the axis of the shift rod 7 is inclined by an angle θ from the horizontal plane II-II. For this reason, the position where the above-mentioned select rod 5 is operated due to its own weight, vibration during running of the vehicle, or the like,
That is, in order not to shift from the set select position,
In connection with the select rod 5, a detent mechanism 30 is provided as shown in FIG.

As shown in FIGS. 2, 3 and 4, the above-mentioned detent mechanism 30 is provided with a pair of engagement grooves 31, 32 formed on the outer peripheral surface on the one end 5f side of the select rod. Four relatively large diameter steel balls selectively engaged in grooves 31 and 32
33a, 33b, 33c, and 33d, and compression coil springs 34a, 34b, 34c, and 34d that constantly urge the steel balls 33a to 33d toward the select rod 5, respectively. The steel balls 33a and 33b are opposed to each other at a position deviated from the axis of the select rod 5 by 180 °, and the steel balls 33c and 33d are the steel balls 33a and 33d.
3b at a position separated from the disposition position of 3b along the stroke direction of the select rod 5 by a predetermined distance.
Are arranged opposite to each other at a position deviated by 180 ° from the center of the axis.

In this example, a position detection mechanism 40 having a non-contact type sensor is provided at the end 5e of the select rod opposite to the detent mechanism 30.

Also, as shown in FIG.
The spacing between the steel rods 33a and 33c and the spacing between the steel balls 33b and 33d in the axial direction of the select rod 5 are respectively represented by β, and the spacing between the steel rods 31 and 32 is represented by α. When the interval between the select positions is γ, the configuration is such that α = β + γ and β> γ.

According to the transmission operating device 1 of the present example having such a detent mechanism 30, the select rod 5 is reliably held at the three select setting positions without any positional deviation.

Specifically, first, the shift fork of the transmission 10
14 _{2 If} the SELECT rod 5 so as to connect the end portion 13a of the shift lever 13 is set to the position shown in FIG. 3 (the neutral position a), a pair of steel balls 33a, 33b are compression coil springs 34a, 34b Supplementary of The other pair of steel balls 33c, 33d is fitted into the engagement groove 31 by the force, and the compression coil spring 34
The engagement is performed at a position on the select rod peripheral surface 5g between the engagement grooves 31 and 32 against the urging force of c and 34d. Under such a state, the engagement groove 31 and the steel ball 33a,
33b, the detent is released (steel ball) even if a downward force in the stroke direction, that is, a force in the direction of arrow A acts on the select rod 5 due to the weight of the select rod 5 itself or the vibration of the vehicle due to the vibration of the vehicle. In this state, the select rod 5 is kept at the neutral position a shown in FIG.

Also, the shift lever 1 is attached to the shift fork 14 ₁ of the transmission 10.
When the select rod 5 is moved in the direction of arrow B from the neutral position a in order to connect the end portions 13a of the third, the pair of steel balls 33a, 33b are compressed coil springs 34a, 34b as shown in FIG. Of the select rod 5 and rides on the peripheral surface 5g of the select rod 5, and the other pair of steel balls 33c, 33d is compressed by the compression coil springs 34c, 3c.
It is fitted into the engagement groove by the urging force of 4d. When the select rod 5 is disposed at the left select position b as shown in FIG. 4, the steel balls 33c and 33d and the engagement groove 3
The downward displacement of the select rod 5 is prevented by the action of engagement with 2.

The shift lever 1 to the shift fork 14 ₃ of the transmission 10
When the select rod 5 is moved in the direction of arrow A from the neutral position a in order to connect the end portions 13a of the third, the pair is moved to the right select position c as shown in FIG. The steel balls 33a and 33b are disengaged from the engagement grooves 31 and ride on the outer peripheral surface 5h of the select rod 5, and the other pair of steel balls 33c and 33d also ride on the outer peripheral surface 5g of the select rod 5. . In this case, since the operation of moving the select rod 5 is performed by the action force of the high-pressure compressed air, the steel ball from the engagement groove 31 is moved.
The disengagement (detent release) of 33a, 33b is performed smoothly without any trouble. When the select rod 5 is disposed at the right select position c as shown in FIG. 5, the select rod 5 is prevented from moving downward (in the direction of arrow A) by a stopper mechanism (not shown). The downward displacement of the select rod 5 is surely prevented by a stopper mechanism (not shown) without using the detent mechanism 30.

When the select rod 5 is operated, a pair of steel balls 33a and 33b and a pair of steel balls 33a and 33b are used.
Since the push rods 34a and 34b press the select rod 5 at opposing positions shifted from each other by 180 °, these pressing forces cancel each other out, and as a result, the select rod 5 is pressed against the bearing portion and the sliding resistance is reduced. There is no danger of inconvenience that the size will increase next.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

For example, as shown in FIG. 6, only steel balls 33a and 33d may be used as the engaging members. In this case, the configuration can be simplified by reducing the number of members.

e. Effects of the Invention As described above, the present invention provides an engagement member at a location which is spaced apart from each other along the stroke direction of the select rod and which is displaced by about 180 ° about the axis of the select rod. (For example, the steel ball 33 shown in the embodiment)
a to 33d) are arranged, and the select rod is fixed to a predetermined position under a state where at least one of the engagement members spaced apart from each other along the stroke direction of the select rod rides on the peripheral surface of the select rod. When the select rod is located at the lowest select position with respect to the horizontal plane, all the engaging members ride on the peripheral surface of the select rod. The position of the select rod is set so that the downward movement of the select rod is prevented by the stopper mechanism. Therefore, even if the stroke of the select rod is short, the engaging member having a relatively large diameter is used. (Steel ball) can be applied to the detent mechanism, and the select rod in the inclined state can be securely locked at multiple select positions with sufficient locking force. Become. Therefore, there is no erroneous display on the display device, and the controller is not forced to perform the correction operation repeatedly, and the original life can be maintained. For this reason, it is possible to sufficiently cope with lowering the floor of large vehicles, particularly city buses.

In addition, since a steel ball having a large diameter can be used, the reliability of the detent function of the select rod can be improved, and the durability of the device can be improved.

In addition, since the steel ball is pressed against the opposing point that is almost 180 ° off center on the axis of the select rod, the pressing forces from the steel ball to the select rod are offset each other, and the select rod is placed on the bearing surface. And the sliding resistance is not increased.

[Brief description of the drawings]

1 to 5 show one embodiment of the present invention, and FIG. 1 is a sectional view of a main part of a select operation mechanism portion when a transmission operation device according to the present invention is arranged at an angle. Second
The figure is an enlarged sectional view of the main part of the select operation mechanism, FIG. 3,
4 and 5 are cross-sectional views showing the operation of the detent mechanism accompanying the operation of the select rod, respectively. FIG. 6 is a cross-sectional view similar to FIG. 3 showing another embodiment of the present invention. FIG. 8 is a sectional view of a main part of the conventional transmission operating device on the select operation side, FIG. 9 is a layout diagram when the conventional device is mounted on a bus, FIGS. The figure is a sectional view showing the detent mechanism. 1 ... Transmission operating device 4 ... Select operation actuator 5 ... Select rod 5g, 5h ... Peripheral surface 30 ... Detent mechanism 31,32 ... Engagement groove 33a-33d ... Steel balls as engaging members, 34a to 34d ... compression coil springs as urging members.

Claims (2)

(57) [Claims] An engaging groove is provided on a peripheral surface of a select rod for selecting operation, which is disposed in a state inclined with respect to a horizontal plane, and is always urged by an urging means toward the peripheral surface of the select rod. A transmission operating device for preventing the position of the select rod from being displaced by fitting the engaged member into the engagement groove, wherein the engagement groove is disposed at a predetermined interval along the axis of the select rod. Are formed at two locations separated from each other, and the engaging member is located at a location spaced apart from each other along the stroke direction of the select rod, and is substantially eighteen around the axis of the select rod.
It is arranged at a position opposed by 0 °, and in a state where at least one of the engaging members spaced apart from each other along the stroke direction of the select rod rides on the peripheral surface of the select rod, While configuring so that the select rod is locked at a predetermined select setting position,
When the select rod is disposed at the lowest select setting position with respect to the horizontal plane, all of the engaging members are set on the peripheral surface of the select rod and are positioned below the select rod. The transmission operating device according to claim 1, wherein a shift to the position is prevented by a stopper mechanism. 2. An arrangement interval of the engagement grooves of the select rod is α, an arrangement interval of the engagement members in the axial direction of the select rod is β, and an interval between adjacent select positions of the select rod is α. 2. The transmission operating device according to claim 1, wherein when γ is set, α = β + γ and β> γ are satisfied.