A motor drive mechanism for an expansion mechanism

Abstract

This utility model discloses a motor transmission mechanism for an extension mechanism, belonging to the field of RV extension technology. It includes a support part, a motor, and an extension part. The support part includes hollow support rods fixed to both sides of the chassis. The tail end of the hollow support rods is connected to a drive connecting plate, and a drive shaft is rotatably connected to the drive connecting plate. The drive shaft is connected to a force-transmitting round tube, which is connected to the motor. The extension part includes an extension rod, which is slidably connected inside the hollow support rods. A rack rod is connected to the bottom of the extension rod. Along the axial direction of the hollow support rods, the bottom of the hollow support rods has an opening, and a rack is provided at the bottom of the rack rod extending from the opening. A gear is connected to the drive shaft between the drive connecting plates, and the gear meshes with the rack at the bottom of the rack rod. A bushing hole is provided on the drive connecting plate, and a bushing is fixed inside the bushing hole. A bearing is connected inside the bushing, and both ends of the drive shaft pass through the inner rings of the bearings. This solves the technical problem of relatively high cost due to long transmission paths and the use of many components in existing technologies.

Description

Technical Field

[0001] This utility model belongs to the field of RV expansion technology, specifically relating to a motor transmission mechanism for an expansion mechanism. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Among numerous mechanical devices, extension mechanisms are being used more and more widely, such as the extension compartments of RVs and the extension structures of modular cabins.

[0004] An improved RV extension device disclosed in the prior art includes a gear transmission rod, which is driven by a motor and connected to a transmission rod via a belt. A slide groove is provided on the transmission rod, and a rack structure is provided in the slide groove. The slide groove is connected to a guide rail via the rack structure, and a car is mounted on the guide rail. The rotation of the motor can drive the gear transmission rod, belt, and transmission rod to rotate, thereby moving the guide rail and the car.

[0005] While the above solution can be expanded, using a transmission rod and belt to transmit the motor's rotation to the transmission rod, which in turn drives the guide rail and car to move, results in a longer overall transmission path and a higher cost due to the use of more components. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a motor transmission mechanism with an extension mechanism, which can solve the technical problems of long transmission paths and relatively high manufacturing costs caused by the use of many components in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A motor drive mechanism for an extension mechanism is provided, comprising a support part, a motor, and an extension part;

[0009] The support section includes hollow support rods fixed on both sides of the chassis. The tail ends of the hollow support rods are connected to a pair of drive connecting plates. The drive connecting plates are rotatably connected to a drive shaft. The drive shaft is connected to a force transmission tube. The other end of the force transmission tube is connected to a motor.

[0010] The extension section includes an extension rod, with an extension frame fixed to the end of the extension rod. The extension rod is slidably connected inside the supporting hollow rod. A rack rod is connected to the bottom of the extension rod. Along the axial direction of the supporting hollow rod, the bottom of the supporting hollow rod has an opening, and a rack rod is provided at the bottom of the opening.

[0011] Between the drive connecting plates, a gear is connected to the drive shaft, and the gear meshes with the rack at the bottom of the rack rod; bushing holes are opened on the drive connecting plates, bushings are fixed in the bushing holes, bearings are connected in the bushings, and the two ends of the drive shaft pass through the inner rings of the bearings.

[0012] Preferably, a keyway is provided on the drive shaft between the drive connecting plates, and the drive shaft is connected to the gear via a flat key through the keyway; bearing retaining rings are installed on the drive shaft on both sides of the gear.

[0013] Preferably, the bearing is located on the side away from the drive connecting plate, and a bearing retaining ring is also installed on the drive shaft.

[0014] Preferably, a pair of fixing plates are provided at the head end of the supporting hollow pole, which are connected to the RV chassis together with the drive connection plate at the tail end.

[0015] Preferably, the motor is fixedly connected to the motor mounting plate. The motor mounting plate, the drive connection plate, and the mounting plate are all L-shaped folded plates, which are fixedly connected by two mutually perpendicular side plates.

[0016] Preferably, the motor is installed in the middle of the tail ends of the two supporting hollow rods, and a force transmission tube is connected to both sides of the motor, with the two force transmission tubes having the same length.

[0017] Preferably, the two ends of the force transmission tube are connected to the output rod of the motor and the drive shaft respectively via pins.

[0018] Preferably, between the drive connecting plate and the fixed plate, both sides of the axis of the bottom opening of the supporting hollow rod are connected to the bottom support plate, and a slot is reserved between the bottom support plates, from which the rack rod extends; the circumferential cross-sectional width of the rack rod is smaller than the circumferential cross-sectional width of the extension rod, and the axis of the top surface of the rack rod coincides with the axis of the bottom surface of the extension rod.

[0019] Preferably, the force-transmitting circular tube is a hollow tube.

[0020] Preferably, the two drive connection plates are connected by bolts.

[0021] Compared with the prior art, the advantages and positive effects of this utility model are:

[0022] In this invention, the extension rod is slidably connected inside the supporting hollow rod, and a drive shaft is rotatably connected to the transmission rod at the end of the supporting hollow rod. Force-transmitting round tubes are connected to both sides of the motor, and these tubes are connected to the drive shaft. Gears are connected to the drive shaft, and the gears mesh with the rack of the rack rod at the bottom of the extension rod. The motor drives the force-transmitting round tubes and the drive shaft to rotate, causing the rack rod and the extension rod to move relative to the supporting hollow rod. Compared to the prior art, which uses a variable-speed transmission rod and belt to transmit the motor's rotation to the transmission rod, and then uses the rotation of the transmission rod to move the guide rail and the car, this invention reduces the transmission path and the number of components used, thus reducing manufacturing costs. Furthermore, bushing holes are provided on the drive connecting plate, bushings are fixed in these holes, and bearings are connected inside the bushings. The two ends of the drive shaft pass through the inner rings of the bearings, providing support for the drive shaft and preventing rotational friction between the drive shaft and the drive connecting plate, thus improving transmission smoothness and reducing wear. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0024] Figure 1 This is an overall three-dimensional view of the motor transmission mechanism according to an embodiment of the present utility model;

[0025] Figure 2 This is a bottom-view three-dimensional view of the meshing point of the gear and rack in an embodiment of this utility model;

[0026] Figure 3 This is a three-dimensional side view of the meshing point between the gear and the rack in an embodiment of this utility model;

[0027] Figure 4 This is a three-dimensional view of the left side of the connection between the motor and the force transmission tube in an embodiment of this utility model;

[0028] Figure 5 This is a three-dimensional view of the connection between the motor and the force-transmitting circular tube in an embodiment of this utility model;

[0029] In the picture:

[0030] 1. Supporting hollow rod; 11. Base plate; 2. Extension section; 21. Extension rod; 22. Rack; 3. Motor; 31. Motor mounting plate; 4. Force transmission tube; 5. Drive connection plate; 51. Bolt; 52. Bushing hole; 6. Drive shaft; 61. Gear; 62. Bearing retaining ring; 7. Bushing; 8. Bearing; 9. Pin. Detailed Implementation

[0031] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0032] The present invention will now be described in detail with reference to the accompanying drawings.

[0033] This embodiment discloses a motor drive mechanism for an extension mechanism, such as... Figure 1 , Figure 2 As shown, it includes a support part, which is slidably connected to the extension part 2. The support part is connected to a motor 3, which is connected to the extension part and is used to drive the extension part to move relative to the support part.

[0034] Specifically, such as Figure 1 , Figure 2 As shown, the support part includes hollow support rods 1 fixed on both sides of the chassis. Each hollow support rod 1 has a pair of drive connecting plates 5 connected to its tail end (the tail end is the end facing the rear of the vehicle). A drive shaft 6 is rotatably connected to the drive connecting plate 5. The drive shaft 6 is connected to a force transmission tube 4. The other end of the force transmission tube 4 is connected to a motor 3. The motor 3 is located in the middle position between the two hollow support rods 1. A force transmission tube 4 is connected to both sides of the motor 3. The drive shaft 6 of the two hollow support rods 1 is connected to the drive connecting plate 5 through the force transmission tube 4.

[0035] like Figure 2 , Figure 3 As shown, the extension part includes an extension rod 21. The extension rod 21 is fixed to the extension frame at the end away from the supporting hollow rod 1 (i.e., the tail end, the end facing the rear of the vehicle). The extension rod 21 is slidably connected inside the supporting hollow rod 1. The bottom of the extension rod 21 is fixedly connected to a rack rod 22. Along the axial direction of the supporting hollow rod 1, a through-hole is opened at the bottom of the supporting hollow rod 1. The rack rod 22 extends out of the through-hole, and a rack is provided at the bottom of the rack rod 22. This allows the extension rod 21 and the rack rod 22 to slide relative to the supporting hollow rod 1.

[0036] like Figure 2 , Figure 3 As shown, between a pair of drive connecting plates 5 at the tail end of each supporting hollow rod 1, the two ends of the transmission shaft 6 are rotatably connected to the two drive connecting plates 5 respectively. Between the two drive connecting plates 5, a gear 61 is connected on the transmission shaft 6, and the gear 61 meshes with the rack at the bottom of the rack rod 22.

[0037] Understandably, when the motor 3 drives the power transmission tube 4 to rotate, it drives the transmission shaft 6 and gear 61 to rotate together. Since the supporting hollow rod 1 is fixed on the RV chassis, the extension rod 21 slides relative to the supporting hollow rod 1 under the rack meshing action of gear 61 and rack rod 22, causing the extension frame to move relative to the RV.

[0038] It should be noted that in this embodiment, the motor 3 only needs to drive the force transmission tube 4 and the drive shaft 6 to transmit power to the extension rod 21, so that it can drive the extension frame to move relative to the RV, thereby reducing the transmission path and the number of parts used, and thus reducing the cost accordingly.

[0039] It should also be noted that in this embodiment, the force-transmitting circular tube 4 is used as the transmission mechanism element. Compared with the use of square tube transmission, this solves the problems of insufficient torsional stiffness and easy torsion deformation of square tubes during the transmission of torsional torque; and uneven stress distribution, which easily leads to local failure. Moreover, the torsional deformation of square tubes will lead to a decrease in transmission accuracy, and stress concentration may also cause the plastic deformation of square tubes to be limited to the corners, affecting the overall mechanical properties. Using the force-transmitting circular tube 4 can avoid bending forces during transmission while also enhancing the torsional resistance of the transmission.

[0040] like Figure 2 As shown, a bushing hole 52 is provided on the drive connecting plate 5. The bushing 7 is passed through the bushing hole 52 and welded and fixed. A connecting bearing 8 (the outer ring diameter of the bearing 8 is equal to the inner diameter of the bushing 7) is installed inside the end of the bushing 7 that extends to the outside of the drive connecting plate 5. The two ends of the drive shaft 6 pass through the inner ring of the bearing 8 (the inner ring diameter of the bearing 8 is equal to the diameter of the drive shaft 6, and they are connected by friction). When the drive shaft 6 rotates, it drives the inner ring of the bearing 8 to rotate relative to the outer ring of the bearing 8.

[0041] It should be noted that in this embodiment, because the gear 61 on the drive shaft 6 meshes with the rack of the rack rod 22, the extension rod 21 will exert pressure on the drive shaft 6. By installing the connecting bushing 7 and bearing 8 on the drive connecting plate 5 and connecting them to both ends of the drive shaft 6, the drive shaft 6 can be supported. At the same time, it can also avoid direct contact between the drive shaft 6 and the drive connecting plate 5, which would lead to rotational friction; it can also avoid dry friction between the two ends of the drive shaft 6 and the drive connecting plate 5; it can further improve the smoothness of transmission and reduce the wear of the equipment.

[0042] In this embodiment, a keyway is provided on the drive shaft 6 located between the drive connecting plates 5, and the drive shaft 6 is connected to the gear 61 by a flat key through the keyway; on both sides of the gear 61, bearing retaining rings 62 are installed on the drive shaft 6 to fix the position of the gear 61, so as to prevent the gear 61 from shifting or shaking, and to prevent the gear 61 from deviating from its position when meshing with the rack 22.

[0043] like Figure 2 As shown, the bearing 8 is located on the side away from the drive connecting plate 5, and a bearing retaining ring 62 is also installed on the drive shaft 6 to fix the position of the bearing 8 and prevent the bearing 8 from shifting.

[0044] It is understandable that when gear 61 is worn or bearing 8 or force transmission tube 4 is damaged, the corresponding pin 9 and bearing retaining ring 62 should be removed from their respective positions, and the gear 61, bearing 8 or force transmission tube 4 that needs to be replaced should be replaced.

[0045] like Figure 1 As shown, a pair of fixing plates are provided at the head end of the supporting hollow rod 1 (the head end is the end facing the front of the vehicle), which are connected to the RV chassis together with the drive connecting plate 5 at the tail end of the supporting hollow rod 1, thereby ensuring the stable fixation of both ends of the supporting hollow rod 1 and ensuring support for the extension part.

[0046] like Figure 1 , Figure 4 , Figure 5 As shown, the motor 3 is fixedly connected to the motor mounting plate 31. The motor mounting plate 31, the drive connecting plate 5, and the mounting plate are all L-shaped folded plates, fixedly connected by two mutually perpendicular side plates. One side plate of the motor mounting plate 31 and the drive connecting plate 5 is parallel to the width direction of the RV and is fixed to the RV chassis by a threaded connection. The other side plate is perpendicular to the ground and perpendicular to the width direction of the RV, so that the force transmission tube 4 is parallel to the width direction of the RV.

[0047] like Figure 1 , Figure 4 , Figure 5 As shown, the motor 3 is installed in the middle of the tail ends of the two supporting hollow rods 1. A force-transmitting circular tube 4 is connected to both sides of the motor 3, and the two force-transmitting circular tubes 4 are of the same length. In this embodiment, the motor 3 is a geared motor with two output rods of the same speed, each output rod connected to a force-transmitting circular tube 4.

[0048] Specifically, in this embodiment, the motor 3 is a WG163 geared motor with two output rods of the same speed, which can drive the two force transmission tubes 4 to rotate at the same speed.

[0049] like Figure 4 , Figure 5 As shown, the output rod of motor 3 is connected to one end of the force transmission tube 4 by a pin 9. Specifically, a pin hole is opened on the output rod of motor 3, and a pin hole is also opened at the end of the force transmission tube 4. The inner diameter of the force transmission tube 4 is equal to the diameter of the output rod of motor 3. The force transmission tube 4 is sleeved on the outside of the output rod of motor 3 so that the pin holes are aligned, and the pin 9 is inserted into the pin hole for fixation.

[0050] like Figure 3As shown, between the drive connecting plate 5 and the fixed plate, bottom support plates 11 are connected on both sides of the axis of the bottom opening of the supporting hollow rod 1. A slot is reserved between the bottom support plates 11, and the rack rod 22 extends out from the slot. The circumferential cross-sectional width of the rack rod 22 is smaller than the circumferential cross-sectional width of the extension rod 21. The rack rod 22 is fixedly connected to the bottom surface of the extension rod 21, and the top axis of the rack rod 22 coincides with the bottom axis of the extension rod 21. The bottom support plates 11 connected to the bottom of the supporting hollow rod 1 can support the extension rod 21, so that the extension rod 21 slides smoothly relative to the supporting hollow rod 1, and at the same time, it can reduce the pressure on the gear 61.

[0051] like Figure 2 , Figure 3 As shown, the force transmission tube 4 is connected to the drive shaft 6 by a pin 9. Specifically, a pin hole is opened at the end of the drive shaft 6 facing the force transmission tube 4, and a pin hole is also opened at the end of the force transmission tube 4. The inner diameter of the force transmission tube 4 is equal to the diameter of the drive shaft 6. The force transmission tube 4 is sleeved on the outside of the drive shaft 6 so that the pin holes are aligned, and the pin 9 is inserted into the pin hole for fixation.

[0052] In this embodiment, the force transmission tube 4 is a hollow tube, which ensures transmission while making it lighter.

[0053] In this embodiment, as Figure 2 As shown, the two drive connecting plates 5 are connected by bolts 51. Specifically, bolt holes are opened at the end of the drive connecting plate 5 away from the supporting hollow rod and the transmission shaft 6. The two drive connecting plates 5 are connected as a whole by bolts 51 to prevent the drive connecting plate 5 from deforming outward and affecting the transmission shaft 6.

[0054] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A motor drive mechanism for an extension mechanism, characterized in that, It includes a support section, a motor, and an extension section; the support section includes a support hollow rod fixed on both sides of the chassis, the tail end of the support hollow rod is connected to a pair of drive connecting plates, the drive connecting plates are rotatably connected to a drive shaft, the drive shaft is connected to a force transmission tube, and the other end of the force transmission tube is connected to the motor; The extension section includes an extension rod, with an extension frame fixed at the tail end of the extension rod, and the extension rod is slidably connected inside the supporting hollow rod; the bottom of the extension rod is connected to a rack rod, and along the axial direction of the supporting hollow rod, the bottom of the supporting hollow rod is open, and a rack rod is provided at the bottom of the rack rod extending out of the opening; Between the drive connecting plates, a gear is connected on the drive shaft, and the gear meshes with the rack at the bottom of the rack rod; a bushing hole is opened on the drive connecting plate, a bushing is fixed in the bushing hole, a bearing is connected in the bushing, and both ends of the drive shaft pass through the inner ring of the bearing.

2. The motor drive mechanism of the extension mechanism as described in claim 1, characterized in that, A keyway is provided on the drive shaft between the drive connecting plates, and the drive shaft is connected to the gear via a flat key through the keyway; bearing retaining rings are installed on the drive shaft on both sides of the gear.

3. The motor drive mechanism of the extension mechanism as described in claim 2, characterized in that, The bearing is located on the side away from the drive connection plate, and the bearing retaining ring is also installed on the drive shaft.

4. The motor drive mechanism of the extension mechanism as described in claim 1, characterized in that, The hollow support rod has a pair of fixing plates at its head end, which are connected to the RV chassis together with the drive connection plate at its tail end.

5. The motor drive mechanism of the extension mechanism as described in claim 4, characterized in that, The motor is fixedly connected to the motor mounting plate. The motor mounting plate, the drive connection plate, and the mounting plate are all L-shaped folded plates, fixedly connected by two mutually perpendicular side plates.

6. The motor drive mechanism of the extension mechanism as described in claim 5, characterized in that, The motor is installed in the middle of the tail ends of the two supporting hollow rods, and a force transmission tube is connected to each side of the motor. The two force transmission tubes are of the same length.

7. The motor drive mechanism of the extension mechanism as described in claim 6, characterized in that, The two ends of the force-transmitting circular tube are respectively connected to the output rod of the motor and the transmission shaft via pins.

8. The motor drive mechanism of the extension mechanism as described in claim 5, characterized in that, Between the drive connecting plate and the fixing plate, bottom support plates are connected to both sides of the bottom opening of the hollow support rod. A slot is reserved between the bottom support plates, and the rack rod extends out from the slot. The circumferential cross-sectional width of the rack rod is smaller than the circumferential cross-sectional width of the extension rod, and the top axis of the rack rod coincides with the bottom axis of the extension rod.

9. The motor drive mechanism of the extension mechanism as described in claim 1, characterized in that, The force-transmitting circular tube is a hollow tube.

10. The motor drive mechanism of the extension mechanism as described in claim 1, characterized in that, The two drive connection plates are connected by bolts.

Images