JPS6129063Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing simultaneous operation of operating shafts used in a transmission gear sliding mechanism, a directional control valve switching mechanism, and the like.

The purpose of this invention is to reduce the number of parts and make the device more compact, as well as to facilitate processing and assembly of a device that prevents simultaneous operation of both operating shafts that are elastically positioned in the return position and the operating position, respectively. .

In the present invention, the outer casing and the lid are aligned at right angles to the sliding holes of the two operating shafts, and two communication grooves between the sliding holes of the operating shafts are provided in parallel on the outer casing side, so that the sliding holes of the two operating shafts are connected at the return position. An annular groove that matches both communication grooves is formed on the outer periphery of each actuating shaft, and at least one first restraint element is inserted into one of the communication grooves, so that one end of the first restraint element is connected to one of the actuation shafts. The length of the first restraint is set so that the other end of the first restraint protrudes or sinks into the other operating shaft sliding hole depending on whether it engages with the outer peripheral surface of the shaft or the annular groove. death,
In addition, two second restraints each having a spring compressed therebetween are inserted into the other communication groove, and a notch is formed in the operating shaft in the operating position so that a portion of each of the second restraints engages. Features.

The figure shows an embodiment of the present invention applied to a transmission gear sliding mechanism, in which two operating shafts 1 and 2 are bored into an outer casing 3 of the transmission and a lid 5 connected thereto by bolts 4, respectively. The operating shaft is slidably fitted into the provided operating shaft sliding holes 6 and 7, and at the joint between the outer casing 3 and the lid 5, which is perpendicular to the operating shaft sliding holes, there is an operating shaft recessed in the outer casing 3 side. Two communicating holes having a square cross section are formed by the communicating grooves 8, 9 between the sliding holes 6, 7 and the joint surface of the lid. 1
a, 2a are annular grooves recessed on the outer periphery of each operating shaft 1, 2, respectively, and the annular grooves 1a, 2a match with the communication grooves 8, 9, respectively, when the operating shaft is in the return position; The cross section of is smaller than a semicircle.

The first restrainer 10 inserted into the communication groove 8 is composed of three hard balls, and the connecting length of the hard balls is such that when one operating shaft, for example 2, is in the return position as shown in the figure, When one end of the first restraint element 10 is engaged as shown in FIG. 1, the other end of the first restraint element is set to substantially circumscribe the other operating shaft sliding hole 6. Therefore, when the operating shaft 2 slides to either the left or right operating position and pushes out the first restraint element 10 from the annular groove 2a, the other end of the first restraint element is inserted into the operating shaft sliding hole 6. It protrudes and engages with the annular groove 1a. The first restrainer 10 is not limited to the group of hard balls shown in the figure, but is a 1st restrainer 10 having both ends shaped like a hemisphere or a truncated cone.
It can also be made into individual rods.

11 are two hard spherical second parts inserted into the communication groove 9.
A compression spring 12 is compressed and clamped between the second restraint elements 11 and 11, and cutouts 1b and 2b in which a part of the second restraint element 11 engages with the operating shafts 1 and 2, respectively, in the operating position. is recessed. The cutouts 1b, 2b have the same cross section as the annular grooves 1a, 2a, and cannot face the communication groove 8 as shown in FIG.

In the figure, 13 is a switching lever attached to the outer casing 3 so as to be able to swing back and forth and left and right using the intermediate spherical portion 13a as a fulcrum; 14 and 15 are lever engaging pieces fixed to the operating shafts 1 and 2, respectively; 16 and 17 are operating axes 1 and 2, respectively.
The shift fork for sliding the transmission gears is shown, and the switching lever 13 is in the state shown in FIG.
5 can be selectively engaged.

According to the above configuration, when both the operating shafts 1 and 2 are at the return position or neutral position as shown in the figure,
The second restraint element 11 engages with the annular grooves 1a and 2a, respectively, by the elasticity of the spring 12, and restrains each operating shaft at the return position. From this state, when one of the operating shafts, for example 2, is slid to either the left or right operating position by the switching lever 13, the second restraint member 11 is pushed out from the annular groove 2a while resisting the elasticity of the spring 12. At the same time, the first restraint element 10
is pushed out, and as described above, the other end of the first restraint element engages with the annular groove 1a of the other operating shaft 1, and the engagement between the first restraint element 10 and the annular groove 1a Even after reaching the operating position as shown by the chain line in FIG. 2 and the second restraint element 11 is engaged with the notch 2b by the elasticity of the spring 12, it is held as it is. As a result, the power tiller equipped with a transmission may fall over, causing the operating shaft 1 in the return position to
Even if a sliding force is inadvertently applied to the gear, the operating shaft 1 is reliably held at the return position, and there is no risk of double meshing of the transmission gear due to the sliding of the operating shaft 1.

Communication grooves 8 and 9 with communication holes recessed in the outer casing 3 and the lid 5
The working shafts 1 and 2 are formed by the joint surfaces of the
After assembling the lid 5 to the outer casing 3, the first and second restrainers 10, 11 and the spring 12 are assembled thereto, and both operating shafts are positioned at their normal positions.
This is to make installation easier.

According to the present invention, the simultaneous activation prevention device including the positioning mechanism for both actuation axes can be installed compactly between the actuation axes between the outer casing and the lid. Since attachment/detachment is performed by opening the lid of the operating shaft sliding hole, there is no need to provide insertion holes for the first and second restrainers or springs on the lid side, and there is no need for a plug to block the insertion holes. This has the effect of not only reducing the number of parts, but also making processing and assembly easier.

[Brief explanation of drawings]

Fig. 1 is a front view of the device of the present invention with the central part of the lid cut away, Fig. 2 is a developed sectional view taken along the line X-X in Fig. 1, and Fig. 3 is a transmission gear slide equipped with the device of the present invention. FIG. 1, 2... Operating shaft, 1a, 2a... Annular groove, 1
b, 2b...notch, 3...outer casing, 5...lid, 6,
7... Operating shaft sliding hole, 8, 9... Communication groove, 10...
...First restraint element, 11... Second restraint element, 12... Compression spring.

Claims (1)

[Scope of utility model registration request] At the joint between the outer casing and the lid that is orthogonal to the sliding holes of the two operating shafts, two communication grooves between the two operating shaft sliding holes are provided in parallel on the outer casing side, and the two communication grooves are arranged in parallel at the return position. An annular groove that matches the outer periphery of each operating shaft is formed in the outer periphery of each operating shaft, and at least one first restraint element is inserted into one of the communication grooves, so that one end of the first restraint element is connected to the outer periphery of one of the operating shafts. The length of the first restraint element is set so that the other end of the first restraint element protrudes or sinks into the other operating shaft sliding hole depending on whether the first restraint element is engaged with the surface or the annular groove, and Two second restrainers each having a spring compressed and clamped therebetween are inserted into the other communication groove, and a notch is formed in each of the actuation shafts in the actuation position so that a portion of the second restraints engages with the two second restraints. Simultaneous operation prevention device for the operating axes.