KR102603606B1 - A Steering System For An Electric Cart - Google Patents

Abstract

The steering device of an electric transport vehicle of the present invention includes a driving sprocket installed at the lower part of the handle shaft, a driven sprocket connected to the driving sprocket with a primary chain, and a main sprocket that rotates in conjunction with the rotation of the driven sprocket; and a left wheel steering unit including a left wheel steering sprocket located on the upper side of the left wheel; and a right wheel steering section including a right wheel steering sprocket located on the upper side of the right wheel; and the main sprocket and the left wheel steering sprocket, and It consists of a secondary chain fastened across the right wheel steering sprocket.

Description

Steering system for an electric cart {A Steering System For An Electric Cart}

The present invention relates to a device for steering a pair of independently driven front wheels in an electric transport vehicle driven by an electric motor. More specifically, it relates to an electric transport vehicle equipped with a chain-type steering device that enables steering of the front wheels suitable for agricultural fields where ridges or mounds are formed.

In general, small, powered transport vehicles are widely used for transporting crops or agricultural materials or spraying pesticides.

These agricultural power transport vehicles must exert large torque to facilitate transporting heavy loads even in rough terrain such as farmland and must be suitable for low-speed operation, so four-wheel drive electric transport vehicles using electric drive motors as a power source are often used.

The present applicant has proposed a steering device using a pair of rod ends described in Korean Patent No. 10-2239092 as a steering device for such an electric transport vehicle.

Looking at the configuration of Korean Patent No. 10-2239092, when the steering wheel is turned to steer the car body left and right, the steering shaft rotates and the link bracket fixed to the steering shaft also rotates, and accordingly, the link bracket coupled to the link bracket The joint between the rod ends of the pair of steering rods also rotates, pushing or pulling the left and right steering rods. At this time, a pushing or pulling force is also applied to the hinge shaft mount connected to the rod end on the other end of the steering rod, so it rotates around the steering hinge axis of the hinge shaft mount, and eventually the hinge shaft mount connected to the hinge shaft mount The wheel rotates in the steering direction.

When working in agricultural fields, agricultural electric transport vehicles must turn the vehicle body at both ends of a furrow and turn toward the next furrow or furrow. However, in normal farmland, the spacing between ridges is narrow. Therefore, in order to move the vehicle body from the section on which work has been completed to the next section, the vehicle body must be able to turn with a small turning radius at the end of the section in order to smoothly enter the next section. In order to turn the car body with a small turning radius, it is desirable to manufacture the wheel so that the steering rotation angle can be manipulated to be sufficiently large.

However, in the technology using the steering rod described above, when the rigid bar-shaped steering rod moves as a link bracket rotates, the steering rod is caught on the steering shaft and surrounding components, making it difficult to secure a sufficient amount of rotational movement. There is a problem in that the steering rotation angle of the wheel becomes narrow.

Meanwhile, a technology that can sufficiently secure the steering rotation angle of the wheels includes a chain-type steering device that uses chain gears to configure the steering device of an electric guided vehicle, and an example of such prior technology is Korean Patent Publication No. 10-2013. It appears in number -0115447.

Looking at the configuration of Korean Patent Publication No. 10-2013-0115447, there is a steering drive gear that is connected to the steering shaft and rotates, and a steering gear connected to the steering drive gear with a chain. When the steering shaft rotates left and right, the steering drive gear rotates left and right. It rotates, and the steering gear connected to the chain also rotates accordingly, making it possible to steer the wheel coupled to the bottom of the steering gear.

However, the chain-type steering device of Korean Patent Publication No. 10-2013-0115447 is a basic technology suitable only for steering a single wheel, and is difficult to use for simultaneously controlling a pair of independently driven left and right wheels.

Korean Patent No. 10-2239092 Korean Patent Publication No. 10-2013-0115447

The present invention is intended to solve the problems of the prior art, and its object is to provide a steering device for an electric transport vehicle configured to secure a large steering angle by controlling a pair of independently driven wheels together with a chain gear. Do this.

In addition, the present invention provides steering of an electric transport vehicle that can set the toe angle of the wheels by finely adjusting the tension of the chain so that a pair of wheels can be aligned at a desired angle using a chain gear installed for steering. An additional task is to provide the device.

In addition, the present invention provides an electric transport vehicle that can set the toe angle of the wheels without the need to adjust the tension of the chain by changing only the structure of the chain sprocket installed for steering in an electric transport vehicle with a chain-type steering device. Providing a steering device is also an additional task.

The steering device of an electric transport vehicle of the present invention includes a driving sprocket installed at the lower part of the handle shaft, a driven sprocket connected to the driving sprocket with a primary chain, and a main sprocket that rotates in conjunction with the rotation of the driven sprocket; and a left wheel steering unit including a left wheel steering sprocket located on the upper side of the left wheel; and a right wheel steering section including a right wheel steering sprocket located on the upper side of the right wheel; and the main sprocket and the left wheel steering sprocket, and It consists of a secondary chain fastened across the right wheel steering sprocket.

In addition, an adjuster B is further installed and coupled to the secondary chain coupled to the main sprocket at the lower part of the left wheel steering sprocket and the right wheel steering sprocket, and the secondary chain coupled to the upper part of the left wheel steering sprocket and the right wheel steering sprocket. An additional adjuster A can be installed and connected to the chain.

Here, when the control device B is configured as the left control device B installed between the left wheel steering sprocket and the main sprocket, the control device A is configured to be combined with the right control device A installed adjacent to the right wheel steering sprocket. desirable.

In addition, if the adjusting device B is configured as a right adjusting device B installed between the right wheel steering sprocket and the main sprocket, the adjusting device A is configured to be combined with the left adjusting device A installed adjacent to the left wheel steering sprocket. desirable.

And the control device B includes both a left control device B installed between the left wheel steering sprocket and the main sprocket and a right control device B installed between the right wheel steering sprocket and the main sprocket, and the control device A is a right wheel steering sprocket. It may be configured to include both a right adjuster A installed adjacent to the sprocket and a left adjuster A installed adjacent to the left wheel steering sprocket.

On the other hand, the wheel steering part of either the left wheel steering part or the right wheel steering part has a hinge shaft having a protruding key extending from the upper part; and an adjuster having an axis hole through which the hinge axis passes and a plurality of bolt holes. sprocket; And the steering device may be configured in such a way that a fixing plate with long hole-shaped adjustment bolt holes is installed at positions corresponding to the protrusion key coupling hole into which the protrusion key is inserted and the plurality of bolt holes.

And the steering device of the electric transport vehicle of the present invention includes a driving sprocket installed at the lower part of the handle shaft, a driven sprocket connected to the driving sprocket with a primary chain, and a main sprocket that rotates in conjunction with the rotation of the driven sprocket. ; and a left wheel steering unit including a left wheel steering sprocket located on the upper side of the left wheel; and a right wheel steering section including a right wheel steering sprocket located on the upper side of the right wheel; and the main sprocket and the left wheel steering sprocket. and a secondary chain fastened across the right wheel steering sprocket; and an adjusting device for adjusting the tension of the secondary chain, wherein the adjusting device includes an adjusting table that is movably installed; and a sprocket that is freely rotatable on an axis installed on the upper part of the adjusting table. It can be configured to include an adjustment bolt that changes the position by pushing the adjustment bar.

Here, the adjustment bar of the adjustment device is installed with a rotation center bolt coupled to one end, and an arc-shaped long hole centered on the rotation center bolt is formed, so that the position can be changed by rotating the adjustment rod around the rotation center bolt. After doing so, it may be fixed by fastening a position fixing bolt to the long hole.

In another embodiment, the adjusting bar of the adjusting device has guide bolts installed on the left and right of the adjusting table, and a straight long hole is formed along the moving direction, so that the position can be changed by moving the adjusting bar in the longitudinal direction inside the guide bolt. After doing so, it may be fixed by fastening a position fixing bolt to the long hole.

The steering device of the electric transport vehicle of the present invention uses a chain to steer by rotating the wheels, so the steering angle can be increased, so even if the gap between the end of one groove and the entrance to the next groove is narrow, the vehicle body can be It has the effect of being able to easily move its position by turning with a small turning radius.

In addition, the present invention has the advantage that the configuration of the chain-type steering device can be easily applied and used even to four-wheel independently driven electric guided vehicles, which were difficult to apply in the past.

And by using devices that adjust the tension of the chain applied to the present invention, the effect of easily adjusting the toe angle of the wheel can be obtained.

In addition, although the present invention uses a chain-type forming device, it is possible to obtain the effect of easily adjusting the toe angle of the wheel without using a device for adjusting the tension of the chain.

Figure 1 is a front perspective view of a steering device for an electric transport vehicle according to the present invention.
Figure 2 is a perspective view of the steering device of the present invention viewed from above.
Figure 3 is an enlarged perspective view of the eastern part of the steering drive of the present invention.
Figure 4 is an enlarged perspective view of the control device portion of the present invention.
Figure 5 is an exploded perspective view of another embodiment of the wheel steering unit of the present invention.
Figure 6 is an assembled plan perspective view of the components of Figure 5.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the thickness of the lines or sizes of components shown in this drawing may be exaggerated or reduced for convenience so that the configuration of the present invention can be more clearly understood.

Terms used to describe the present invention are terms defined in consideration of functions in the present invention. However, since these terms may be expressed in different terms depending on the intention or custom of the designer or user, the definitions of these terms used in the present invention should be determined by taking into account the contents described throughout the specification.

In addition, directions such as 'top', 'bottom', 'front', 'back', 'left', 'right', 'front', 'rear', 'front', 'back', etc. used in the description of the present invention. The terminology is based on the driver's seat of the electric transport vehicle, or based on the orientation of the disclosed drawing(s). However, since the components of embodiments of the present invention can be positioned in various orientations, the term directional is used for illustrative purposes and is not limiting.

When it is stated that the components used in the present invention are 'connected', 'coupled', or 'fastened' to each other, it should be understood that this also includes cases where the components are made indirectly through intermediate components.

In addition, in the description of the present invention, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the invention are omitted.

Hereinafter, the configuration of a steering device for an electric guided vehicle according to the present invention will be described with reference to FIGS. 1 to 3. Figure 1 is a perspective view showing the entire steering device of an electric transport vehicle according to an embodiment of the present invention from the front side. FIG. 2 is a perspective view of the steering device of the electric transport vehicle shown in FIG. 1 viewed from above. Figure 3 is an enlarged perspective view of the eastern part of the steering drive.

Referring to Figure 1, the steering device of the electric guided vehicle according to an embodiment of the present invention is disposed on a device frame 100 that is installed horizontally and horizontally on the upper side of both wheels. And at the lower part of the device frame 100, a wheel steered by a steering device is positioned in combination with a hinge shaft mounting device.

Referring to Figures 1 to 3, the steering device of the electric guided vehicle of the present invention can be divided into three major components. They are the steering drive unit 10, which receives the rotational force of the handle, the left wheel steering unit 20, which is responsible for steering the left wheel 90, and the right wheel steering unit 30, which is responsible for steering the right wheel 91. .

The steering drive unit 10 includes a drive sprocket 16 installed on the lower part of the handle shaft 14, a driven sprocket 11 connected to the drive sprocket 16 and a primary chain 19, and the driven sprocket 11. It is composed of a main sprocket (12) that rotates in conjunction with the rotation of.

The handle axis 14 installed below the handle 15 is installed at an angle toward the driver. However, since the central axis of the drive sprocket 16 connected to the handle axis 14 is installed vertically, the axis line of the handle axis 14 and the axis line of the central axis of the drive sprocket 16 intersect at a predetermined angle. Therefore, it is preferable that the connection between the lower end of the handle axis 14 and the central axis of the driving sprocket 16 is made of a universal joint 13.

The driven sprocket 11 is installed on the same horizontal surface as the driving sprocket 16 and is connected to the primary chain 19 to receive rotational force from the driving sprocket 16.

The driven sprocket (11) is large and has a larger number of gear teeth than the driving sprocket (16).

The driven sprocket 11 can set the relative rotation speed according to the gear ratio with the driving sprocket 16, and the number of teeth of the driving sprocket 16 is between 10 and 20, and the number of teeth of the driven sprocket 11 is It is desirable to form between 40 and 100 pieces. In other words, the designer can select the gear ratio between both sprockets as needed and design the number of teeth of both sprockets accordingly.

At the lower part of the driven sprocket 11, the main sprocket 12 is installed as a circle indicated by a dotted line in FIG. 2. The main sprocket 12 is preferably installed to share the central axis of the driven sprocket 11, and is configured to rotate in conjunction with the rotation of the driven sprocket 11. The main sprocket (12) is small and has fewer gear teeth than the driven sprocket (11).

Meanwhile, as shown in FIG. 3, in the present invention, a left frame 96 and a right frame 97 that move upward toward the front are coupled to both ends of the base frame 98 installed horizontally on the chassis, and this left frame 96 ) and the handle axis installation frame (95) was installed across the upper side of the right frame (97), and then the handle axis (14) was installed there.

At this time, an adjustment hole (99) formed as a long hole is formed on the left frame (96) and the right frame (97), and this adjustment hole (99) and the handle axis installation frame (95) are connected to the position fixing bolt (99-1). It is configured to connect, and the position fixing bolt (99-1) is moved up and down along the adjustment hole (99) to adjust the angle at which the handle axis (14) is tilted toward the driver.

Referring to FIG. 2, the left wheel steering unit 20 installed on the left side of the device frame 100 with respect to the driver's seat is composed of a left wheel hinge shaft 22 and a left wheel steering sprocket 21.

As shown in FIG. 1, the left wheel hinge shaft 22 penetrates the device frame 100, one end of which is fixedly coupled to the hinge shaft mount A (102), and the other end protrudes toward the top of the device frame 100. Connect the left wheel steering sprocket (21).

At this time, a bearing is installed in the through hole of the device frame 100 through which the left wheel hinge shaft 22 passes, so that the left wheel hinge shaft 22 can rotate freely.

And since the left wheel hinge shaft 22 and the hinge shaft mount A (102) are fixedly coupled, when the left wheel hinge shaft 22 rotates, the hinge shaft mount A (102) also rotates to achieve steering of the wheel. do.

Referring to Figures 1 and 2, the right wheel steering unit 30 consists of a right wheel hinge shaft 32 and a right wheel steering sprocket 31, and is installed on the right side of the device frame 100 based on the driver's seat.

The configuration of coupling and installing the right wheel steering unit 30 to the device frame 100 and the hinge shaft mounting device B (101) is the same as that described for the left wheel steering unit 20, and is therefore omitted.

The right wheel steering sprocket (31) and the left wheel steering sprocket (21) installed as above are connected to the main sprocket (12) by a secondary chain (39).

With the above configuration, a basic steering device for rotating the handle to steer the wheel in the desired direction is completed.

However, the chains used in power transmission devices usually sag to a certain extent after installation, resulting in vibration, noise, and poor engagement between the sprocket and chain. Therefore, an idle sprocket is added to increase the tension of the chain. will be maintained.

Referring to Figure 1, in the present invention, a plurality of adjusting devices including an idle sprocket are installed, including the primary chain adjusting device 80, adjusting device B, and adjusting device A.

The primary chain adjuster 80 is installed on the primary chain 19 fastened between the drive sprocket 16 and the driven sprocket 11, and as shown in FIGS. 2 and 3, the primary chain 19 ) is installed on the outside of the running track to increase the tension of the chain by pushing the chain inward, and increases the number of teeth of the drive sprocket (16) and driven sprocket (11) in contact with the chain.

Control device B is installed on the secondary chain (39) fastened to the lower part of the left wheel steering sprocket (21) and the right wheel steering sprocket (31) across the main sprocket (12), and the secondary chain (39) It is installed outside the running track to increase the tension of the chain by pushing the chain inward, and increases the number of teeth of the left wheel steering sprocket (21), right wheel steering sprocket (31), and main sprocket (12) connected to the chain.

In the embodiment of the present invention shown in FIG. 2, adjusting devices B are installed in pairs on the left and right sides of the main sprocket 12. That is, the left adjuster B (60) is installed between the left wheel steering sprocket (21) and the main sprocket (12), and the right adjuster B (70) is installed between the right wheel steering sprocket (31) and the main sprocket (12). is installed.

However, adjusting device B does not necessarily have to be installed as a pair as above, and depending on the designer's needs, it is possible to select and install only one of the left adjusting device B (60) and the right adjusting device B (70).

The adjuster A is installed on the secondary chain 39 that is fastened to the upper part of the left wheel steering sprocket 21 and the right wheel steering sprocket 31. As shown in FIG. 2, the secondary chain 39 It is installed inside the running track and pushes the chain outward. The reason why it is installed inside the running track of the secondary chain (39) is because the upper and lower widths of the upper surface of the device frame to which adjusting device A is attached are narrow, making it difficult to attach adjusting device A to the outside of the traveling track. If the upper surface is wide enough, it is desirable to install control device A outside the running track.

As mentioned above, since the adjuster A is installed inside the running track of the secondary chain 39, it is mainly used for adjusting the toe angle of the wheel, which will be described later, rather than increasing the tension of the chain.

In the embodiment of the present invention shown in Figure 2, the adjusting device A is installed as a pair between the left wheel steering sprocket (21) and the right wheel steering sprocket (31). That is, the left adjuster A (40) is installed toward the left wheel steering sprocket (21), and the right adjuster A (50) is installed toward the right wheel steering sprocket (31).

In addition, the adjusting device A does not necessarily have to be installed as a pair as above, and it is possible to select and install only one of the left adjusting device A (40) and the right adjusting device A (50) depending on the designer's needs.

In order to generate tension by pushing the chain with the above-described adjusting devices, a means is needed to push and move the included adjusting sprockets to the required position.

The sprocket moving means of the adjusting device used in the embodiment of the present invention uses a pivoting adjuster as in the left adjusting device A (40), the right adjusting device A (50), and the primary chain adjusting device (80) and the left adjusting device B. As in (60) and right control device B (70), there is a reciprocating control bar used.

First, the configuration of the left control device A (40) having a pivoting control table will be described with reference to FIG. 4.

The left adjusting device A (40) includes an adjusting table (42) whose position can be changed, an adjusting sprocket (41) that is freely rotatable on an axis fixed to the upper surface of the adjusting table, and the adjusting table (42). It is provided with an adjustment bolt (44) that changes the position by pushing.

The adjustment table 42 has a rotation center bolt 45 installed at one end, and an adjustment hole 47 is formed by drilling a long hole in an arc shape centered on the rotation center bolt 45. And a position fixing bolt (46) is fastened to this adjustment hole (47).

Then, the bolt installation block 43 is fixedly installed at a predetermined distance from the longitudinal side of the adjuster 42. There is no limit to the shape of the bolt installation block 43, and it is sufficient to simply form a through hole toward the longitudinal side of the adjuster 42. And since the adjustment bolt (44) is installed through this through hole, if you turn the adjustment bolt (44) installed in this way and push the side of the adjuster (42) toward the end, the adjuster (42) turns to the rotation center bolt (45). You can change its location. When the adjuster (42) has reached the required position, tighten the position fixing bolt (46) to secure it.

As previously explained, the right adjuster A (50) and the primary chain adjuster (80) have the same configuration as the left adjuster A (40), so they are replaced with the above description.

Next, the configuration of the left control device B (60) having a reciprocating control table will be described with reference to FIG. 3.

The left adjuster B (60) has the same configuration as the left adjuster A (40), but differs in the configuration for moving the adjuster (62).

The left control device B (60) includes an adjustment sprocket (61) that is freely rotatable on an axis fixed to the upper surface of the control table (62) and an adjustment bolt (64) that pushes the control table (62) to change its position. Equipped with

The adjuster 62 has guide bolts 65 installed on the left and right, and must have a side shape that allows straight reciprocation between the guide bolts 65. In this embodiment shown in FIG. 3, the control table 62 is formed in a rectangular parallelepiped shape so that it can perform a straight reciprocating movement between the guide bolts.

And in the control table 62, a straight long hole is drilled along the moving direction to form the control hole 67. A position fixing bolt 66 is fastened to the adjusting hole 67. By installing a plurality of adjusting holes 67 and position fixing bolts 66, the fixing force of the adjuster 62 can be improved.

Then, install the bolt installation block (63) and the adjustment bolt (64) at a predetermined distance from the side of the adjuster (62) on the side without the guide bolt. The installation configuration of the bolt installation block 63 and the adjustment bolt 64 is the same as that of the left adjuster A (40).

When the adjusting bolt 64 installed in this way is turned and the side of the adjusting rod 62 is pushed to the end, the adjusting rod 62 moves linearly in the longitudinal direction inside the guide bolt according to the guidance of the guide bolt 65. And when the adjuster 62 reaches the required position, tighten the position fixing bolt 66 to secure it.

Since the right control device B (70) has the same configuration as the left control device B (60), it is replaced by the above description.

Next, another embodiment of the present invention will be described with reference to FIGS. 5 and 6.

Looking at the configuration shown in FIG. 5, the hinge shaft 22-1 has a cross-shaped groove cut into one cross section to form a protruding key 22-2.

The steering sprocket (21-1) forms an axis hole (21-2) in the center into which the hinge axis (22-1) is inserted, and a plurality of bolt holes (21-3) are installed at predetermined intervals around the axis hole. I'm doing it.

The fixing plate 25 is formed in a disk shape with a smaller diameter than the steering sprocket 21-1, and has a cross-shaped protruding key engaging hole (22-2) of the hinge shaft 22-1 at its center. 26) was formed, and an adjustment bolt hole (27) was formed at a position corresponding to the bolt hole (21-3) of the steering sprocket (21-1). Therefore, the fixing plate 25 can be fixed to the steering sprocket 21-1 by fastening the bolt hole 21-3 and the adjustment bolt hole 27 with one bolt (not shown).

6 shows the upper part as seen when the steering sprocket 21-1 and the fixing plate 25 are sequentially assembled on the hinge shaft 22-1.

The sprocket shown in FIGS. 5 and 6 replaces any one of the steering sprockets 21 and 31 installed on the left wheel steering unit 20 or the right wheel steering unit 30 shown in FIGS. 1 and 2. This is a steering sprocket that can be installed.

For example, assume that the configuration shown in FIGS. 5 and 6 is applied to the left wheel steering unit 20 of FIGS. 1 and 2. That is, instead of the existing left wheel hinge shaft 22, the hinge shaft 22-1 of Figure 5 is installed so that the protruding key 22-2 is at the top, and the steering sprocket 21-1 and the fixing plate 25 are installed. By sequentially inserting them into the hinge shaft 22-1 and fastening them with bolts (not shown), a new left wheel steering unit that replaces the left wheel steering unit 20 of FIGS. 1 and 2 can be created.

As such, the steering unit using the sprocket shown in FIGS. 5 and 6 has the feature of being able to align the wheels even without the adjusting devices 40, 50, 60, and 70 described above. This wheel alignment action will be described later.

Next, the operation of the steering device and the method of aligning the wheels will be described with respect to the embodiments shown in FIGS. 1 to 4.

First, the operation of the steering device will be described with reference to FIGS. 1 and 2.

In order to steer the vehicle body left and right, when the handle 15 is turned, the handle shaft 14 and the drive sprocket 16 installed at the bottom of the handle shaft rotate together. And the driven sprocket (11) connected to the driving sprocket (16) and the primary chain (19) also rotates.

And since the main sprocket 12 is installed on the central axis of the driven sprocket 11, the main sprocket 12 also rotates in conjunction with the rotation of the driven sprocket 11.

Meanwhile, when the main sprocket 12 rotates, the left wheel steering sprocket 21 and the right wheel steering sprocket 31, which are connected to the main sprocket 12 and the secondary chain 39, rotate in the same direction. .

The left wheel steering sprocket 21 and the right wheel steering sprocket 31 are coupled to the left wheel hinge shaft 22 and the right wheel hinge shaft 32, respectively, and the left wheel hinge shaft 22 and the right wheel hinge shaft Since the bottom of (32) is fixedly coupled to the hinge shaft mount A (102) and the hinge shaft mount B (101), respectively, when the steering sprocket (21) and the right wheel steering sprocket (31) rotate, the hinge shaft is mounted. Sphere A (102) and hinge shaft mounting device B (101) also rotate in the same direction (see Figure 1).

However, the hinge shaft mount A (102) and the hinge shaft mount B (101) each have a left casing (104) and a right casing (103) integrated into each other, and a left wheel (90) and a right wheel (91). Since the wheel axle 92 is coupled to the left casing 104 and the right casing 103, respectively, the wheel is steered in the direction of rotation by the rotation of the hinge shaft mount A (102) and the hinge shaft mount B (101). It can be rotated (the unexplained symbol m is a wheel drive motor).

Next, the wheel alignment method of the present invention will be described with reference to FIGS. 1 to 4.

When assembling a chain-type steering device as in the present invention, wheel alignment is first performed and then chain hanging work is performed.

In the wheel alignment of an electric transport vehicle running at a low speed as in the present invention, both wheels are aligned side by side without a toe angle, or both wheels are aligned with a very small toe in.

Next, when hanging the chain, pull it so that the tension is firmly applied to the chain. However, when this pulling operation is performed, the chain affects the left wheel steering sprocket (21) and the right wheel steering sprocket (31) and rotates little by little, so the initial alignment of the wheels is also slightly disturbed.

In addition, even properly aligned wheels may become misaligned during driving.

Therefore, when the chain hanging operation is completed or the wheel alignment is disturbed, the alignment must be corrected by adjusting the toe angle of the wheel. The process is as follows.

In the present invention, adjusting device B and adjusting device A are used as alignment devices. Referring to Figure 2, control device B is left control device B (60) and/or right control device B (70), and control device A is left control device A (40) and/or right control device A (50). am.

For example, in a steering device equipped with all four adjustment devices, the left wheel 90 of the vehicle body is toe out and the right wheel 91 is straight, so that the four adjustments In order to use the device to align both wheels in a dowel shape, operate in the following manner.

First, referring to FIGS. 2 and 4, when the adjusting bolt 44 of the left adjusting device A 40 is adjusted and the adjusting rod 42 is pushed upward, the adjusting rod 42 moves the rotation center bolt 45. It rotates upward toward the center and is pushed. Accordingly, the left control sprocket A (41) installed on the control table (42) also moves upward while pushing the secondary chain (39). However, at this time, slightly loosen the adjustment bolt of the right adjustment device A (50) in advance so that the right adjustment sprocket A (51) is slightly pushed down. This means that if the tension on the secondary chain (39) is too strong, the left adjustment sprocket A (51) is slightly pushed down. Since it is difficult for the adjustment sprocket A (41) to push up the secondary chain (39), the tension of the chain is slightly lowered in advance to facilitate the upward movement of the left adjustment sprocket A (41).

When the left control sprocket A (41) pushes the secondary chain (39) upward, a tensile force is generated in the secondary chain (39) that pulls it toward the left control device A (40), so the left wheel steering sprocket (21) moves the chain. It rotates clockwise due to tensile force.

Accordingly, as shown in FIG. 1, the hinge shaft mount 102 coupled to the hinge shaft 22 of the left wheel steering sprocket 21 and the left wheel 90 coupled thereto also rotate slightly clockwise, so that the torque The left wheel 90, which is out, also rotates to the right and returns to its initial straight state.

However, since the right wheel steering sprocket 31 also rotates counterclockwise under the influence of the chain tension, the straight right wheel 91 rotates to the left and ends up in a toe-in state. However, the chain length from the left adjustment sprocket A (41) to the right wheel steering sprocket (31) is much longer than the left wheel steering sprocket (21), so the tensile force is attenuated and the rotation amount at which the right wheel (91) toes in is the left wheel. It is slightly smaller than the rotation amount in (90).

In this state, if you adjust the adjustment bolt (74) of the right adjustment device B (70) and push the adjustment bar (72), the right adjustment sprocket B (71) pushes the secondary chain (39) inward, so the secondary chain ( 39), a tensile force that is pulled toward the right adjuster B (70) is generated, and as a result, the right wheel (91) rotates clockwise and returns to a straight state.

At this time, the amount by which the right wheel (91) must be rotated clockwise again is small, so the amount by which the right adjustment sprocket B (71) is pushed and the resulting chain tension force are also small, so it is located at a long distance from the right adjustment sprocket B (71). The chain tension on the left adjustment sprocket A (41) is almost reduced. Therefore, the left wheel 90 maintains its alignment almost as is.

If the left wheel 90 is torn out slightly again, repeat the above operation again until both wheels are gradually aligned side by side.

Conversely, if the alignment of the right wheel (91) is very disturbed, both wheels can be properly aligned by adjusting the right adjusting device A (50) and the left adjusting device B (60) in the same manner as above.

On the other hand, for the above-mentioned wheel alignment, all four adjustment devices, including the left adjustment device B (60), the right adjustment device B (70), and the left adjustment device A (40) and right adjustment device A (50), are not required. .

In other words, only the left control device B (60) and the right control device A (50) are installed, or only the right control device B (70) and the left control device A (40) are installed, so that only two control devices are installed, and the wheel is adjusted in the method described above. Sorting operations can be performed.

For example, if only the right adjuster B (70) and the left adjuster A (40) are installed, if tension is applied to the chain using the left adjuster A (40), the left wheel (90) rotates clockwise to the right wheel. (91) can be rotated counterclockwise, and by using the right adjuster B (70), the left wheel (90) can be rotated counterclockwise and the right wheel (91) can be rotated clockwise. Alignment of both wheels can be performed.

In particular, if the left wheel 90 is mainly adjusted and aligned, the work can be performed in the same way as when all four adjustment devices are installed.

However, if it is necessary to mainly align the far right wheel (91) with the left adjuster A (40), or conversely, if it is necessary to mainly align the far left wheel (90) with the right adjuster B (70), Due to the attenuation of chain tension due to distance, the amount of rotation of the wheel to be adjusted is small, and conversely, a large amount of rotation occurs on the wheel at a close distance that does not require much adjustment, so alignment work must be done while adjusting this in a balanced manner. In other words, the task of tightening or loosening the secondary chain (39) is properly adjusted using the left adjuster A (40) and the right adjuster B (70) so that both wheels rotate and align around the hinge axes (22, 32). You have to adjust it to reach a losing state.

Next, a method of aligning the wheels in an embodiment in which the left wheel steering sprocket 21 is installed by replacing the steering sprocket 21-1 shown in FIGS. 5 and 6 will be described.

The steering unit equipped with the steering sprocket shown in FIGS. 5 and 6 includes the upper left adjuster B (60), the right adjuster B (70), and the left adjuster A (40) and right adjuster A (50). The wheels can be aligned without any of the four adjusters.

For example, in place of the left wheel steering unit in FIG. 2, the hinge shaft 22-1 shown in FIG. 5 is installed, and the steering sprocket 21-1 and the fixing plate 25 are sequentially installed on the hinge shaft 22-1. 1), and then fastened with bolts (not shown) to assume the state of having a steering unit installed to have the form shown in FIG. 6. And at this time, all of the above four control devices are removed and are considered to be absent.

For example, if the left wheel (90) is toe out and the right wheel (91) is straight, and you want to return it to the state where both wheels are aligned in a straight line, you can operate it in the following way. .

First, loosen the bolt (not shown) and remove the fixing plate (25). And when the steering sprocket (21-1) is aligned in a straight line by holding the left wheel (90) in a stationary state, the hinge shaft (22-1) fixed to the hinge shaft mounting device A (102) also rotates clockwise. rotates in the direction Accordingly, the protruding key 22-2 on the upper part of the hinge shaft 22-1 shown in FIG. 6 also rotates clockwise. When aligning the wheels described above, the rotation length of the protruding key 22-2 is generally within a few millimeters.

When the protruding key coupling hole 26 of the fixing plate 25 is aligned and inserted into the protruding key 22-2 with the protruding key rotated a few millimeters as described above, the adjustment bolt hole 27 formed in the fixing plate 25 is shown in Figure 2. It is placed in a position rotated a few millimeters to the right from the position shown in 6. Since the adjustment bolt hole (27) is an arc-shaped long hole, the bolt hole (21-3) formed in the steering sprocket (21-1) is still connected to the adjustment bolt hole (27). They are exposed overlapping.

Therefore, in this state, if the fixing plate 25 is fixed by fastening bolts to the adjustment bolt hole 27 and the bolt hole 21-3, wheel alignment is completed.

In this process, even if the hinge shaft (22-1) rotates, the steering sprocket (21-1) does not move at all, so the right wheel steering sprocket (31) is connected to the steering sprocket (21-1) and the secondary chain (39). ) also remains in place, and the right wheel (91) linked to the right wheel steering sprocket (31) also remains straight.

Meanwhile, in the above case, if the right wheel 91 needs to be rotated and aligned, the right wheel 91 can be rotated and aligned while the fixing plate 25 is lifted.

At this time, when the right wheel (91) rotates, the right wheel hinge shaft (32) and the right wheel steering sprocket (31) fixed to the hinge shaft with a key also rotate, so the right wheel steering sprocket (31) and the secondary chain (39) The connected steering sprocket (21-1) will also rotate.

However, since the hinge shaft 22-1 does not rotate within the shaft hole 21-2 of the steering sprocket 21-1, the left wheel 90 can remain in place.

In this way, by using the sprocket devices shown in FIG. 5, wheel alignment can be performed without using the four adjustment devices.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention should be understood only by the matters stated in the claims, and those skilled in the art in the technical field to which the present invention pertains can improve and change the technical idea of the present invention into various forms. Therefore, if such improvements and changes are obvious to those skilled in the art, they will fall within the scope of protection of the present invention.

10: Steering drive eastern part
11: driven sprocket 12: main sprocket
13: Universal joint 14: Handle axis
15: Handle 16: Drive sprocket
19: 1st chain
20: Left wheel steering unit
21: Left wheel steering sprocket 21-1: Steering sprocket
21-2: Shaft hole 21-3: Bolt hole
22: Left wheel hinge axis
22-1: Hinge axis 22-2: Protruding key
25: fixing plate 26: protruding key coupling hole
27: Adjustment bolt hole
30: Right wheel steering unit
31: Right wheel steering sprocket 32: Right wheel hinge axis
39: secondary chain
40: Left control device A 41: Left control sprocket A
42, 52, 62, 72, 82: Adjuster 43, 63, 73, 83: Bolt installation block
44, 64, 74, 84: Control bolt 45, 85: Rotation center bolt
46, 66, 76, 86: Position fixing bolt 47, 67, 77, 87: Adjusting hole
65, 75: Guide bolt
50: Right adjustment device A 51: Right adjustment sprocket A
60: Left control device B 61: Left control sprocket B
70: Right adjustment device B 71: Right adjustment sprocket B
80: Primary chain control device 81: Primary chain control sprocket
90: Left wheel 91: Right wheel
92: Wheel axis 95: Handle axis installation frame
96: Left frame 97: Right frame
98: base frame 99: adjustment ball
99-1: Position fixing bolt
100: Device frame 101: Hinge shaft mounting B
102: Hinge shaft mounting A 103: Right casing
104: Left casing

Claims (9)

A driving sprocket 16 installed at the lower part of the handle shaft, a driven sprocket 11 connected to the driving sprocket 16 and a primary chain 19, and a main sprocket that rotates in conjunction with the rotation of the driven sprocket 11 ( A steering drive unit 10 including 12);
A left wheel steering unit (20) including a left wheel steering sprocket (21) located on the upper side of the left wheel (90);
A right wheel steering unit (30) including a right wheel steering sprocket (31) located on the upper side of the right wheel (91);
It includes a secondary chain (39) fastened across the main sprocket (12), the left wheel steering sprocket (21), and the right wheel steering sprocket (31),
An adjuster B is coupled to the secondary chain 39, which is coupled across the main sprocket 12 to the lower part of the left wheel steering sprocket 21 and the right wheel steering sprocket 31, and the left wheel steering sprocket 21 and An adjuster A is coupled to the secondary chain (39) coupled across the upper part of the right wheel steering sprocket (31).
The adjusting device A and adjusting device B include a movable adjusting table, a sprocket that is freely rotatable on an axis installed on the upper part of the adjusting table, and an adjusting bolt that changes the position by pushing the adjusting table. ,
A steering device for an electric transport vehicle, characterized in that the alignment state can be adjusted by changing the toe angle of the wheels by adjusting the tension of the secondary chain (39) using the adjusting device A and adjusting device B. delete According to clause 1,
The adjusting device B is a left adjusting device B (60) installed between the left wheel steering sprocket (21) and the main sprocket (12),
The steering device A is a steering device for an electric guided vehicle, characterized in that it consists of a right adjustment device A (50) installed adjacent to the right wheel steering sprocket (31). According to clause 1,
The adjusting device B is a right adjusting device B (70) installed between the right wheel steering sprocket (31) and the main sprocket (12),
The steering device A is a steering device for an electric guided vehicle, characterized in that it consists of a left adjustment device A (40) installed adjacent to the left wheel steering sprocket (21). According to clause 1,
The adjusting device B includes a left adjusting device B (60) installed between the left wheel steering sprocket (21) and the main sprocket (12); And a right adjuster B (70) installed between the right wheel steering sprocket (31) and the main sprocket (12),
The adjusting device A includes a right adjusting device A (50) installed adjacent to the right wheel steering sprocket (31); and a left control device A (40) installed adjacent to the left wheel steering sprocket (21). A driving sprocket 16 installed at the lower part of the handle shaft, a driven sprocket 11 connected to the driving sprocket 16 and a primary chain 19, and a main sprocket that rotates in conjunction with the rotation of the driven sprocket 11 ( A steering drive unit 10 including 12);
A left wheel steering unit (20) including a left wheel steering sprocket (21) located on the upper side of the left wheel (90);
A right wheel steering unit (30) including a right wheel steering sprocket (31) located on the upper side of the right wheel (91);
It includes a secondary chain (39) fastened across the main sprocket (12), the left wheel steering sprocket (21), and the right wheel steering sprocket (31),
Either the left wheel steering unit 20 or the right wheel steering unit 30,
A hinge shaft (22-1) penetrating the device frame (100), one end of which is fixedly coupled to the hinge shaft mounting hole, and a protruding key (22-2) extending from the upper portion; and
A steering sprocket (21-1) having an axis hole (21-3) through which the hinge axis passes and a plurality of bolt holes (21-3); and
It includes a fixing plate (25) with long hole-shaped adjustment bolt holes (27) formed at positions corresponding to the protrusion key coupling hole (26) into which the protrusion key (22-2) is inserted and the plurality of bolt holes (21-3). However,
The hinge shaft (22-1) fixed to the hinge shaft mounting device is installed so that the protruding key (22-2) is at the top, and the steering sprocket (21-1) and the fixing plate (25) are sequentially connected to the hinge shaft. After inserting it into (22-1), the steering device of an electric transport vehicle is coupled by fastening bolts penetrating the plurality of bolt holes (21-3) and the long hole-shaped adjustment bolt hole (27). delete According to clause 1,
The control bar of the control device is,
At one end, the rotation center bolt is coupled and installed,
An arc-shaped long hole is formed centered on the rotation center bolt.
A steering device for an electric transport vehicle, characterized in that the position is changed by rotating the adjuster around the rotation center bolt, and then fixed by fastening a position fixing bolt to the long hole. delete

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