A lifting mechanism for a garage trolley

Abstract

The application discloses a lifting mechanism for a garage carrier, which comprises a lifting cam frame with a large through hole in the center, a lifting wheel shaft with external splines on the upper and lower ends installed at the large through hole, upper and lower combination teeth, a lifting cam and a lifting wheel shaft successively sleeved on the lifting wheel shaft, wherein the upper combination tooth is funnel-shaped, the internal splines are engaged with the external splines on the upper end of the lifting wheel shaft, the lower surface of the upper end plane of the upper combination tooth is engaged with the upper surface of the lower combination tooth through the radial circumferential distribution of the triangular splines, and the lower surface of the lower combination tooth is fixed on the lifting cam. The application solves the problems of the prior art, such as large wear of the roller on the track, poor transmission effect, poor stability, short service life and the like in the lifting process.

Description

Technical Field

[0001] This invention relates to garage transport vehicles, and more particularly to a lifting mechanism for garage transport vehicles. Background Technology

[0002] Parking difficulties are a problem that arises as cities develop socially, economically, and in terms of transportation. The emergence of automated parking systems has largely alleviated this problem. As a component of these systems, the transport vehicle's main function is to move vehicles from the parking lot entrance to a parking space and from the parking space to the exit. However, existing transport vehicles suffer from short lifespans, rapid wear and tear, and high replacement rates. This is largely due to the structure of the lifting mechanism and the transmission efficiency and stability during operation. As a crucial component of the transport vehicle, the rollers on the lifting mechanism's tracks wear down continuously during operation. When multiple lifting mechanisms are used in combination, the wear on the rollers on both sides of each group is uneven, directly affecting the product's stability and lifespan. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a lifting mechanism for garage transport vehicles that is compact in structure, has high mechanical strength, good transmission effect, and symmetrically installed rollers on both sides.

[0004] Technical solution: To achieve the above objectives, the lifting mechanism for a garage transport vehicle of the present invention includes a lifting cam frame with a large through hole in the center, a lifting wheel shaft with external splines at the upper and lower ends installed at the large through hole, and an upper engaging tooth, a lower engaging tooth, and a lifting cam sequentially sleeved on the lifting wheel shaft. The upper engaging tooth is funnel-shaped, and its internal spline meshes with the external spline at the upper end of the lifting wheel shaft. The lower surface of the upper plane of the upper engaging tooth meshes with the upper surface of the lower engaging tooth through radially circumferentially distributed triangular splines. The lower surface of the lower engaging tooth is fixed on the lifting cam.

[0005] The upper plane of the lifting cam frame has a recessed circular step surface at its center, and a large through hole is located at the center of the step surface. A ring of threaded holes is provided around the large through hole.

[0006] The bottom side of the lifting cam frame is also equipped with a drive sprocket that can combine multiple lifting cam frames.

[0007] The top of the spline at the upper end of the lifting wheel shaft is also provided with a cylindrical boss. The top of the boss is also provided with a thread. A locking washer is fitted on the boss and the locking washer is fixed with a lock nut. The lifting power transmitted from the lifting wheel shaft is transmitted to the lifting cam through the upper engagement teeth and the lower engagement teeth.

[0008] The lower end of the lifting wheel shaft is fitted with a lifting sprocket, whose external spline meshes with the internal spline of the lifting sprocket. At the upper and lower parts of the meshing point, the lifting wheel shaft is also provided with a retaining groove. Each retaining groove is provided with a first retaining ring and a second retaining ring to restrict the lifting sprocket from moving along the axial direction of the lifting wheel shaft. The lower end of the outer ring of the lifting sprocket is provided with an external spline that is linked with the lifting motor, and the upper end is placed in the large through hole in the center of the lifting cam frame.

[0009] The hoisting wheel shaft has a third retaining ring, a first deep groove ball bearing, a second deep groove ball bearing, an inner spacer, and a third deep groove ball bearing sequentially fitted from the second retaining ring upwards in the middle. The height of the third deep groove ball bearing is lower than the spline position at the upper end of the hoisting wheel shaft. A retaining groove is provided at the upper spline near the third deep groove ball bearing. A fourth retaining ring is provided in the retaining groove to prevent the deep groove ball bearing from moving axially along the hoisting wheel shaft.

[0010] The outer rings of the first deep groove ball bearing, the second deep groove ball bearing, the inner spacer, and the third deep groove ball bearing are also fitted with lifting wheel fixing seats. The inner rings are interference-fitted with the deep groove ball bearings. The lower part of the outer ring is provided with a protruding circular platform with a small through hole. Above the platform, from top to bottom, are the thrust ball bearing, the first single-row deep groove ball bearing, the outer spacer, and the second single-row deep groove ball bearing, all of which are interference-fitted.

[0011] The outer ring below the platform is placed in the central large through hole of the lifting cam frame, above the lifting sprocket. The lower surface of the platform is placed on the stepped surface of the lifting cam frame. The lifting wheel fixing seat is fixed to the threaded hole of the lifting cam frame with bolts through the small through hole of the platform.

[0012] The upper surface of the lifting cam is provided with a recessed circular groove, and the lower engagement tooth is fixed on the bottom surface of the recessed groove. Both the upper and lower engagement teeth are inside the groove. The inner ring of the other end of the lifting cam is provided with two steps. The first step is clearance-fitted with the circular platform of the lifting wheel fixing seat, and the second step is interference-fitted with the upper surface of the thrust ball bearing and the outer ring of the single-row deep groove ball bearing. The outer ring of the lifting cam is provided with two running tracks that are symmetrically rotated along the axis of the lifting wheel shaft. Rollers are provided in the tracks, and the rollers complete the lifting motion as the track height changes.

[0013] Limit blocks are installed on both sides of the lifting cam between the two running tracks, and limit switches are provided to control the rotation of the lifting cam in conjunction with the limit blocks.

[0014] Beneficial effects: The present invention has the following advantages: 1. The upper and lower engaging teeth of the present invention are engaged and linked by radially circumferentially distributed triangular splines. The grooves of the triangular splines are shallow, the stress concentration at the tooth root is small, and the weakening of the strength of the parts themselves is small. At the same time, there are many spline teeth, which are evenly distributed and the total contact area is large, and the linkage force is more uniform, which improves the load capacity of the lifting mechanism.

[0015] 2. The lifting wheel shaft, lifting sprocket, and inner ring of the upper engagement tooth of the present invention are linked by splines, which provides good centering and transmission effect, and facilitates assembly, adjustment, maintenance and repair.

[0016] 3. The lifting cam is made of high alloy steel and undergoes quenching and tempering treatment, resulting in good mechanical strength. The running rails on both sides are subjected to local high-frequency quenching process, which improves the hardness of the rails and meets the usage requirements. The rollers on the running rails on both sides are symmetrically installed, which reduces roller wear and extends the service life of the product. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembly structure of the present invention;

[0018] Figure 2 This is a cross-sectional view of the present invention. Detailed Implementation

[0019] The technical solution of the present invention will be described in detail below with reference to the embodiments and accompanying drawings.

[0020] like Figure 1 As shown, the lifting mechanism for a garage transport vehicle of the present invention includes a lifting cam frame 1 with a large through hole in the center, a lifting wheel shaft 2 with external splines at the upper and lower ends installed at the large through hole, and an upper engaging tooth 3, a lower engaging tooth 4, and a lifting cam 5 sequentially sleeved on the lifting wheel shaft 2. The upper engaging tooth 3 is funnel-shaped, and its internal spline meshes with the external spline at the upper end of the lifting wheel shaft 2. The lower surface of the upper plane of the upper engaging tooth 3 meshes with the upper surface of the lower engaging tooth 4 through radially circumferentially distributed triangular splines. The lower surface of the lower engaging tooth 4 is fixed on the lifting cam 5. The groove of the triangular spline is shallow, the stress concentration at the tooth root is small, and the weakening of the strength of the part itself is small. At the same time, the number of spline teeth is large and evenly distributed, the total contact area is large, the linkage force is more uniform, and the load capacity of the lifting mechanism is improved.

[0021] The upper plane of the lifting cam frame 1 has a recessed circular step surface at the center, and a large through hole is located at the center of the step surface. A ring of threaded holes is provided around the large through hole. The bottom side of the lifting cam frame 1 is also provided with a transmission sprocket 25 that can be used to combine multiple lifting cam frames 1.

[0022] The top of the spline on the upper end of the lifting wheel shaft 2 is also provided with a cylindrical boss, and the top of the boss is also provided with a thread. A locking washer 6 is fitted on the boss, and the locking washer 6 is fixed with a locking nut 7. The lifting power transmitted from the lifting wheel shaft 2 is effectively transmitted to the lifting cam 5 through the upper engagement tooth 3 and the lower engagement tooth 4.

[0023] like Figure 2As shown, a lifting sprocket 8 is fitted at the lower end of the lifting wheel shaft 2. Its external spline meshes with the internal spline of the lifting sprocket 8. At the upper and lower parts of the meshing point, the lifting wheel shaft 2 is also provided with a groove. Each groove is provided with a first retaining ring 10 and a second retaining ring 11 to restrict the lifting sprocket 8 from moving along the axial direction of the lifting wheel shaft 2. The lower end of the outer ring of the lifting sprocket 8 is provided with an external spline that is linked with the lifting motor, and the upper end is placed in the central through hole of the lifting cam frame 1.

[0024] The hoisting wheel shaft 2 is fitted with a third retaining ring 12, a first deep groove ball bearing 13, a second deep groove ball bearing 14, an inner spacer 15, and a third deep groove ball bearing 16 in sequence from the second retaining ring 11 upwards. The height of the third deep groove ball bearing 16 is lower than the spline position at the upper end of the hoisting wheel shaft 2. A retaining groove is provided at the upper spline near the third deep groove ball bearing 16. A fourth retaining ring 26 is provided in the retaining groove to prevent the deep groove ball bearing from moving axially along the hoisting wheel shaft 2.

[0025] The outer rings of the first deep groove ball bearing 13, the second deep groove ball bearing 14, the inner spacer 15, and the third deep groove ball bearing 16 are also fitted with a lifting wheel fixing seat 17. The inner ring of the seat is interference-fitted with the deep groove ball bearing. The lower part of the outer ring is provided with a protruding circular platform with a small through hole. Above the platform, from top to bottom, are the thrust ball bearing 18, the first single-row deep groove ball bearing 19, the outer spacer 20, and the second single-row deep groove ball bearing 21, all of which are interference-fitted. The outer ring below the platform is placed in the central large through hole of the lifting cam frame 1, above the lifting sprocket 8. The lower surface of the platform is placed on the stepped surface of the lifting cam frame 1. The lifting wheel fixing seat 17 is fixed to the threaded hole of the lifting cam frame 1 by bolts 9 through the small through hole of the platform. The step surface is used to position the lifting wheel fixing seat 17 in the height direction. The large through hole of the lifting cam frame 1 is used to position the lifting wheel fixing seat 17 in the radial direction. The inner ring of the lifting wheel shaft 2, the lifting sprocket 8, and the upper engagement tooth 3 are linked by spline, which has good centering and transmission effect. The lifting cam frame 1 also has a switch mounting bracket and positioning block for the lifting wheel fixing seat 17 on one side of the upper plane.

[0026] The upper surface of the lifting cam 5 has a recessed circular groove, and the lower engaging tooth 4 is fixed on the bottom surface of the recessed groove. Both the upper engaging tooth 3 and the lower engaging tooth 4 are located within the groove. The inner ring of the other end of the lifting cam 5 has two steps. The first step is clearance-fitted with the circular platform of the lifting wheel fixing seat 17, and the second step is interference-fitted with the upper surface of the thrust ball bearing 18 and the outer ring of the single-row deep groove ball bearing, ensuring that the lifting cam 5 and the lifting wheel shaft 2 can rotate flexibly and freely in the circumferential direction. The outer ring of the lifting cam 5 has two running tracks that are symmetrically rotated along the axial direction of the lifting wheel shaft 2. Rollers 22 are installed in the tracks. The rollers 22 complete the lifting motion as the track height changes. The lifting cam 5 is made of high alloy steel and undergoes heat treatment, resulting in good mechanical strength. The running tracks on both sides are subjected to local high-frequency quenching process, which improves the hardness of the tracks and meets the usage requirements. The rollers 22 on the running tracks on both sides are symmetrically installed, reducing wear and extending the service life of the product.

[0027] Limit blocks 23 are installed on both sides of the lifting cam 5 between the two running tracks. A limit switch 24 is provided in conjunction with the limit blocks 23 to control the rotation of the lifting cam 5. When the roller 22 rises to the highest point of the running track with the rotation of the lifting cam 5, the contact of the limit switch 24 is not in contact with the limit block 23 at all, and the lifting cam 5 stops rotating. Conversely, when the roller 22 falls to the lowest point of the running track with the rotation of the lifting cam 5, the contact of the limit switch 24 is in full contact with the limit block 23, and the lifting cam 5 stops rotating.

Claims

1. A lifting mechanism for a garage transport vehicle, comprising a lifting cam frame (1) with a large through hole in the center, and a lifting wheel shaft (2) with external splines at the upper and lower ends installed at the large through hole, characterized in that: It also includes an upper engagement tooth (3), a lower engagement tooth (4), and a lifting cam (5) that are sequentially fitted onto the lifting wheel shaft (2). The upper engagement tooth (3) is funnel-shaped, and its internal spline meshes with the external spline at the upper end of the lifting wheel shaft (2). The lower surface of the upper plane of the upper engagement tooth (3) meshes with the upper surface of the lower engagement tooth (4) through radially circumferentially distributed triangular splines. The lower surface of the lower engagement tooth (4) is fixed on the lifting cam (5). The top of the spline at the upper end of the lifting wheel shaft (2) is also provided with a cylindrical boss, and the top of the boss is also provided with a thread. A stop washer (6) is fitted on the boss, and the stop washer (6) is fixed with a lock nut (7). The lifting power transmitted from the lifting wheel shaft (2) is transmitted to the lifting cam (5) through the upper engagement tooth (3) and the lower engagement tooth (4). The lower end of the lifting wheel shaft (2) is fitted with a lifting sprocket (8), whose external spline meshes with the internal spline of the lifting sprocket (8). At the meshing point, the lifting wheel shaft (2) is also provided with a slot. The slot is provided with a first retaining ring (10) and a second retaining ring (11) to restrict the lifting sprocket (8) from moving along the axial direction of the lifting wheel shaft (2). The lower end of the outer ring of the lifting sprocket (8) is provided with an external spline that is linked with the lifting motor, and the upper end is placed in the central through hole of the lifting cam frame (1). The hoisting wheel shaft (2) is fitted with a third retaining ring (12), a first deep groove ball bearing (13), a second deep groove ball bearing (14), an inner spacer (15), and a third deep groove ball bearing (16) in sequence from the second retaining ring (11) to the upper end. The height of the third deep groove ball bearing (16) is lower than the spline position at the upper end of the hoisting wheel shaft (2). A retaining groove is provided at the upper end of the spline near the third deep groove ball bearing (16). A fourth retaining ring (26) is provided in the retaining groove to prevent the deep groove ball bearing from moving axially along the hoisting wheel shaft (2).

2. The lifting mechanism for a garage transport vehicle according to claim 1, characterized in that: The upper plane of the lifting cam frame (1) has a recessed circular step surface at the center, and a large through hole is located at the center of the step surface. A ring of threaded holes is provided around the large through hole.

3. The lifting mechanism for a garage transport vehicle according to claim 2, characterized in that: The bottom side of the lifting cam frame (1) is also provided with a transmission sprocket (25) that can combine multiple lifting cam frames (1).

4. The lifting mechanism for a garage transport vehicle according to claim 1, characterized in that: The outer rings of the first deep groove ball bearing (13), the second deep groove ball bearing (14), the inner spacer (15), and the third deep groove ball bearing (16) are also fitted with lifting wheel fixing seats (17). The inner rings are interference-fitted with the deep groove ball bearings. The lower part of the outer ring is provided with a protruding circular platform with a small through hole. Above the platform, the thrust ball bearing (18), the first single-row deep groove ball bearing (19), the outer spacer (20), and the second single-row deep groove ball bearing (21) are interference-fitted in sequence.

5. The lifting mechanism for a garage transport vehicle according to claim 4, characterized in that: The outer ring below the platform is placed in the central through hole of the lifting cam frame (1), above the lifting sprocket (8). The lower surface of the platform is placed on the stepped surface of the lifting cam frame (1). The lifting wheel fixing seat (17) is fixed to the threaded hole of the lifting cam frame (1) by bolts (9) through the small through hole of the platform.

6. The lifting mechanism for a garage transport vehicle according to claim 4, characterized in that: The upper surface of the lifting cam (5) is provided with a recessed circular groove, and the lower engagement tooth (4) is fixed on the bottom surface of the recessed circular groove. The upper engagement tooth (3) and the lower engagement tooth (4) are both in the groove. The inner ring of the other end of the lifting cam (5) is provided with two steps. The first step is clearance-fitted with the circular platform of the lifting wheel fixing seat (17), and the second step is interference-fitted with the upper surface of the thrust ball bearing (18) and the outer ring of the single-row deep groove ball bearing. The outer ring of the lifting cam (5) is provided with two running tracks that are symmetrically rotated along the axis of the lifting wheel shaft (2). Rollers (22) are provided in the tracks. The rollers (22) complete the lifting motion as the track height changes.

7. The lifting mechanism for a garage transport vehicle according to claim 6, characterized in that: Limit blocks (23) are installed on both sides of the lifting cam (5) between the two running tracks. Limit switches (24) for controlling the rotation of the lifting cam (5) are provided in conjunction with the limit blocks (23).

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