RU56530U1 - TRANSMISSION CABLE TRANSMITTER TRANSMISSION - Google Patents

Abstract

The invention relates to the field of mechanical engineering, to devices for remote control of mechanisms. The cable drive translator is designed to convert the reciprocating movements of the cables connected to the gearshift lever into rotational and translational movements of the gearshift rod in the vehicle gearbox. The solution is aimed at establishing optimal coordinates between the mating parts of the translator. The technical result consists in increasing the reliability and durability of the remote cable drive. The technical result is achieved in the translator of the cable drive of the gearshift mechanism, comprising a housing-clamp with a spline hole for connecting to the gearshift shaft and a housing-fork with eyes for mounting drive cables and a tab with a hole for connecting to a jet thrust. The housing-clamp is mounted on an axis installed in the bearing supports located in the hole of the fork housing. The technical solution defines the parameters of the mutual arrangement of the mating elements of the translator. The working plane of the foot facing the jet thrust is at a distance of 25 ÷ 60 mm from the axis of the splined hole. An incision was made along the splined hole on the clamp housing and a coupling bolt was installed. On the foot made from one to three holes for connection with a jet draft. Axle bearings can be made in the form of rolling bearings or sliding bearings. Plain bearings can be made in the form of bushings made of plastic.

Description

The invention relates to the field of mechanical engineering, to devices for remote control of mechanisms. The cable drive translator is designed to convert the reciprocating movements of the cables connected to the gearshift lever into rotational and translational movements of the gearshift rod in the vehicle gearbox.

Known remote control gearbox [1], containing a front longitudinal link connected to the rear longitudinal link associated with the gear shift mechanism. The front longitudinal link is equipped with a U-shaped lever rigidly connected to the rear longitudinal link with its upper part. The rear longitudinal rod is provided with a console and is rigidly connected with its upper part, while the lower part of the console is connected with the front longitudinal rod having freedom of rotation. As a result, it is possible to transmit axial and circumferential forces between the front and rear longitudinal rods with great misalignment.

The design of this remote drive provides remote transmission of axial and peripheral forces with a large misalignment of the front and rear longitudinal rods, however, the device has limited application possibilities. In particular, for transferring forces over a relatively long distance, for example, at a bus gearshift drive with a rear power unit, it is impossible to use the device due to the presence of several bends on the drive track.

Also known is the drive of the gear shift mechanism of the KAMAZ gearbox [2]. The drive consists of a gear lever mounted in the bus cabin. The lever is installed in the master support and is connected to the link to which the ends of the remote control cables are attached. The opposite ends of the cables are mounted on a translator, which is designed to convert the reciprocating movement of the cables into rotation and axial movement of the gearshift shaft mounted on the gearbox.

The translator consists of two body parts - the clamp housing and the plug housing, mounted on a common axis with the possibility of rotation relative to each other. In the case-clamp, a slotted hole is made with a cut and a coupling bolt for connecting to the gearshift shaft, and the case-fork has two eyes with holes for attaching cables and a foot with an hole for securing the jet thrust. The housing-clamp is rigidly fixed on the axis installed in the bearing bearings. Supports are placed in the housing-plug on both sides of the housing-clamp.

The disadvantage of the device in the absence of an optimal ratio of the dimensions of the mating elements of the translator, ensuring the reliability of the remote cable drive.

The problem solved by the proposed utility model is to establish optimal coordinates between the mating parts of the translator.

The technical result consists in increasing the reliability and durability of the remote cable drive.

The technical result is achieved in a translator of a cable drive of a gearshift mechanism, comprising a clamp housing with a spline hole for connecting to the gearshift shaft and a plug housing with eyes for securing the drive cables and a tab with a hole for connecting to the jet thrust. The housing-clamp is mounted on an axis installed in the bearing supports located in the hole of the fork housing. The technical solution defines the parameters of the mutual arrangement of the mating elements of the translator. The working plane of the foot facing the jet thrust is at a distance of 25 ÷ 60 mm from the axis of the splined hole. An incision was made along the splined hole on the clamp housing and a coupling bolt was installed. On the foot made from one to three holes for connection with a jet draft. Axle bearings can be made in the form of rolling bearings or sliding bearings. Plain bearings can be made in the form of bushings made of plastic.

The technical result was obtained thanks to the proposed solution, which was found as a result of OCD.

The translator rotates the gearshift shaft under the influence of the forces transmitted by moving one cable (forward or backward) by both drive cables.

The shift shaft along its axis is moved by the translator under the influence of the forces transmitted by cables moving in opposite directions. In this case, the translator rotates relative to the fulcrum created by the jet thrust.

One of the critical components of the translator, ensuring reliability and durability of the device, are hinges with ball bearings for attaching cables to the eyes and for attaching reactive thrust to the foot. The coordinates established experimentally and tested in operation: the distance of 25 ÷ 60 mm between the working plane of the foot and the axis of the splined hole, contribute to an even distribution of forces between the hinges. The hinges wear evenly during the operation of the device, they are less likely to require repair and maintenance. As a result, the reliability and durability of the remote cable drive of the gearshift mechanism are increased.

Figure 1 presents the inventive translator; figure 2 installation of the translator in a remote cable drive on the gearbox.

The translator consists of a clamp housing 1 and a plug housing 2 mounted on a common axis 3. The axis is installed in the holes of the plug housing on the bearing bearings 4. A slot 5 is made in the clamp housing for connecting to the gear rod, and along the hole is made section 6 and a coupling bolt 7. The eyelets 8 are made on the body-plug for securing the cables and the tab 9 with a hole for connecting the jet thrust. The distance between the working plane of the foot and the axis of the splined hole L = 25 ÷ 60 mm.

The remote drive consists of a gear lever 10 mounted in the driver's cab. The lever is fixed in the support 11 and connected to the cables of the drive 12. The cables are fixed to the pads 13. The opposite ends of the cables are connected to the eyes 8 of the translator. The housing-clamp 1 is mounted on the spline shank of the gearshift rod installed in the support 14 of the gearshift mechanism. The tab 9 is connected to the jet link 15.

The device operates as follows.

Using the lever 10, the driver drives the cables 12. By moving the lever forward or backward, both cables move simultaneously in one direction. In this case, the translator rotates around the axis of the gearshift rod and, accordingly,

the rod rotates itself, as a result of which the fork mounted on the rod engages the corresponding gear.

By moving the lever 10 to the sides in the planes intersecting with the vertical longitudinal plane, the cables 12 are forced to move in opposite directions relative to each other. In this case, the cables create a moment on the translator in a horizontal plane, which, thanks to the jet link 15 connected to the tab 9, is converted into axial force by the gearshift rod. The rod moves in the axial direction, making a gear selection.

So the translator performs its function - converting the reciprocating movements of the cables connected to the gearshift lever into rotational and translational movements of the gearshift rod in the vehicle gearbox.

The parameters established during OKR: the distance of 25-60 mm between the working plane of the foot and the axis of the spline hole, contribute to an even distribution of forces between the hinges. It should be noted that remote control of the gearbox requires not only an effective kinematic drive scheme, which ensures the precise inclusion of the desired gear, but also certain dynamic characteristics.

The distance between the working plane of the foot 9 facing the jet thrust and the axis of the splined hole 5 of the housing-clamp 1 depends on the force at the points of contact between the parts of the translator and the force on the lever 10, which the driver must apply when shifting gears. A distance of 25-60 mm (L in FIG. 1) between the elements under consideration allows the driver to deflect the lever with a force of 0.05-0.08 kN, which corresponds to the requirements of the standard.

The distance L under dynamic loads, in fact, is the shoulder of the lever creating a distortion force between the connection point of the tab 9 with the jet link 15 and the axis of the hole 5, in which the splined end of the gearshift shaft is fixed. The smaller this distance, the smaller the amount of “harmful” forces at the attachment points.

The efforts exerted by the driver can be reduced, in particular, by simply lengthening the lever 10, however, a finer approach is required to choose the dimensions of the mating elements of the translator, due to limited space, the node must be compact, but at the same time transfer considerable effort.

It is difficult to determine the dimensions of the mating elements of the device by calculation because of the need to take into account a large number of factors. More reliable results are achieved experimentally.

The tests were carried out on a special stand. The plug body was made up of two parts connected by a fixing bar, which provided the parts were brought together and adjusted within the given limits of size change L. The translator was mounted on the gearbox (mounted on the gearshift shaft). Using a dynamometer, the gear selection force F on the driver’s lever was measured. As a result of a series of tests, the limits of the optimal values of L corresponding to the permissible values of F. were determined.

The data are presented in the table.

L mm twenty 25 thirty 35 40 45 fifty 55 60 65 F kH 0,050 0.051 0,053 0.058 0,060 0,065 0,068 0,073 0,078 0,082

Based on the data obtained as a result of the experiment, the optimal limits of size L are established: 25–60 mm.

The most critical components of the device are the articulated joints of parts (cables with eyes, reactive traction with a foot). Due to the optimal load range, the hinges wear evenly during the operation of the device, and the wear rate decreases. As a result, the durability and reliability of the remote cable drive of the gearshift mechanism are increased.

Information sources:

1. RF patent №2163200, IPC B 60 K 20/00.

2. Installation and operation manual for cable gearbox control RE 37.1703008. Published by KORA Engineering LLC, Naberezhnye Chelny, 2004, p.6-7 - prototype.

Claims (6)

1. The cable drive of the gearshift mechanism, comprising a clamp housing with a spline hole for connecting to the gearshift shaft and a fork housing with eyelets for securing the drive cables and a foot with a hole for connecting to the jet rod, the clamp housing is mounted on an axis mounted in bearing bearings located in the hole of the fork housing, characterized in that the working plane of the foot facing the thrust is located at a distance of 25 ÷ 60 mm from the axis of the splined hole. 2. The translator according to claim 1, characterized in that a cut along the spline hole is made on the clamp housing and a coupling bolt is installed. 3. The translator according to claim 1, characterized in that the tab is made from one to three holes for connection with a jet thrust. 4. The translator according to claim 1, characterized in that the axis supports are made in the form of rolling bearings. 5. The translator according to claim 1, characterized in that the axis supports are made in the form of sliding bearings. 6. The translator according to claim 5, characterized in that the bearings are made in the form of bushings made of plastic.