Guide wheel

Abstract

The utility model belongs to the technical field of agricultural mechanical parts, and particularly relates to a guide wheel which comprises a tubular hub and a ring-shaped rim, the hub and the rim are in transition connection through spokes, the inner ends of the spokes are fixedly connected with the hub, the outer ends of the spokes are connected with the rim in an inserted mode, and the spokes and the rim are in circumferential limiting fit. The connecting structure of the spokes used for transition connection of the hub and the rim and the hub and the rim is reasonable, positioning installation of the spokes is facilitated, rotating displacement of the spokes, the hub and the rim can be effectively prevented, assembly operation of the guide wheel is simplified, and meanwhile stability and reliability of the guide wheel structure can be improved and guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to agricultural machinery parts technical field, especially relate to a guide wheel. BACKGROUND

[0002] The prior application CN217918174U of the applicant provides a guide wheel for facilitating production and machining of the guide wheel, comprising a hub, a web plate and a rim, a plurality of petal bodies are combined to form a web plate in the shape of a ring plate as a whole, the outer plate edge of the web plate is connected with the rim in a plug-in connection mode, and the hub is arranged in a middle connecting hole of the web plate and is fixedly connected with the hole of the middle connecting hole. Since the hub, the web plate and the rim are produced and machined separately, the components can be made of different materials, thereby achieving the effect of reducing the weight of the agricultural machinery while ensuring the wear resistance of the wheel body. In actual application, due to the large difference in material quality between the rim and the web plate, even if the rim and the web plate are connected by welding, the welding will be easily disconnected after long-term use, thereby causing the rim and the web plate to rotate relative to each other, resulting in wear of the web plate body and making the reliability and service life of the guide wheel unable to meet the demand. SUMMARY

[0003] The utility model aims at providing a guide wheel capable of preventing the rim and the web plate part from rotating relative to each other.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a guide wheel, comprising a tubular hub and a ring-shaped rim, the hub and the rim are connected by spokes, the inner end of the spoke is fixedly connected with the hub, and the outer end of the spoke is connected with the rim in a plug-in connection mode and forms a circumferential limiting fit.

[0005] Compared with the prior art, the utility model has the following technical effects: the spoke used for connecting the hub and the rim has a reasonable connection structure, which facilitates positioning and installation of the spoke and effectively prevents the spoke from rotating and displacing with the hub and the rim, thereby simplifying the assembly operation of the guide wheel and improving the stability and reliability of the guide wheel structure. BRIEF DESCRIPTION OF DRAWINGS

[0006] The contents expressed by each drawing of the specification and the marks in the drawings are briefly described as follows:

[0007] Figure 1 is a perspective schematic view of an embodiment;

[0008] Figure 2 is a perspective schematic view of an embodiment in a hidden rim state;

[0009] Figure 3 is a front view of a spoke and petal body in a cooperation state;

[0010] Figure 4 is a right view of the spoke and petal body in the cooperation state;

[0011] Figure 5 is a half-sectioned perspective view of the rim and a piece of the petal body in a fitted state with a spoke;

[0012] Figure 6 is a perspective view of the spoke;

[0013] Figure 7 is a perspective view of the petal body. DETAILED DESCRIPTION

[0014] The specific embodiments of the utility model will be further described in detail below by means of the description of the embodiments in combination with the drawings.

[0015] A guide wheel comprises a tubular hub 10 and a ring-shaped rim 20, and further comprises spokes 30 connecting the hub 10 and the rim 20, the inner end of the spoke 30 is fixedly connected with the hub 10, and the outer end of the spoke 30 is insertedly connected with the rim 20 and the two constitute a circumferential limiting fit.

[0016] As shown in the accompanying Figure 1 , the outer end of the spoke 30 is insertedly connected into the rim 20, and then the hub 10 is inserted into the space formed by the inner end of each spoke 30 along the axial direction of the rim 20, the inner end of the spoke 30 is clearance fit with the hub 10 or the spoke 30 abuts against the outer wall of the hub 10, and then the hub 10 and the spoke 30 are welded to complete the assembly of the guide wheel. In this embodiment, the spoke 30 is insertedly connected with the rim 20 to limit the relative rotational displacement of the two, so that the reliable assembly of the guide wheel can be realized without welding the spoke 30 and the rim 20, which reduces the welding work amount and fundamentally avoids the risk of welding separation after long-term use of the two components.

[0017] The rim 20 has a rim outer peripheral fit surface for fitting with a transmission belt or a transmission chain, in order to realize reliable guiding of the transmission belt or the transmission chain wound on the guide wheel, the rim outer peripheral fit surface should be arranged in the same core with the pipe core of the hub 10. In this embodiment, the outer peripheral surface of the rim 20 is a smooth cylindrical surface as a whole, so that the cylindrical surface outer peripheral surface of the rim 20 is arranged in the same core with the pipe core of the hub 10, that is, the pipe core of the hub 10 coincides with the axial core of the outer peripheral surface of the rim 20.

[0018] As shown in the accompanying Figure 2 , 3 , the spoke 30 comprises a spoke body 30a arranged between the hub 10 and the rim 20 and an insertion head 30b extending into the body of the rim 20. As shown in the accompanying Figure 5As shown, the inner side wall of the rim 20 is provided with a slot 21 matching the outer contour of the spigot 30b, and the slot opening of the slot 21 points to the core of the rim 20. In this embodiment, the spoke 30 is arranged along the radial direction of the rim 20, i.e. the length direction of the spoke 30 coincides with the radial direction of the rim 20, so that the load acting on the rim 20 can be reliably transmitted to the hub 10 along the radial direction of the rim 20 by the spoke 30, thereby fully ensuring the radial load bearing capacity of the guide wheel body with limited material.

[0019] As shown in the accompanying drawings, Figure 6 In this embodiment, the spoke 30 is in the shape of a rectangular strip, and the two side walls of the spoke 30 are arranged in parallel along the length direction thereof. In other embodiments, the two side walls of the spoke 30 can also be curved or folded.

[0020] In a preferred embodiment, the spigot 30b is symmetrically arranged relative to the median plane in the thickness direction of the spoke 30. The thickness direction of the spoke 30 is the axial direction of the guide wheel, as shown in the accompanying drawings. Figure 6 In the embodiment shown in the accompanying drawings, the spigot 30b is symmetrically arranged along the median plane in the up-down direction in the drawings, so that it is not necessary to distinguish whether the spoke 30 has a front side or a back side during assembly, thereby facilitating the installation operation of the operator.

[0021] Further, in this embodiment, the spigot 30b is in the shape of a block with a thick middle portion and thin side portions in the circumferential direction of the wheel body. When the spigot 30b is inserted into the slot 21, the transition surface between the thick and thin portions of the spigot 30b abuts against the corresponding cavity wall in the slot 21, thereby limiting the rotational displacement of the spoke 30 relative to the rim 20 in the circumferential direction.

[0022] In a preferred embodiment, the thickness of the thick middle portion of the spigot 30b is less than or equal to the maximum thickness of the spoke body 30a. That is, the maximum thickness of the spigot 30b is less than or equal to the maximum thickness of the spoke body 30a. On the one hand, the spoke body 30a can shield the slot opening of the slot 21 to prevent dust and water from seeping into the slot, and on the other hand, this facilitates the operator to hold the end portion of the spoke 30 to obliquely insert the spigot 30b into the slot 21 of the rim 20, thereby improving the convenience of assembly operation.

[0023] The spigot 30b of this embodiment is in the shape of a "convex" block with a long middle portion and short side portions in the radial direction of the wheel body. As shown in the accompanying drawings, Figure 2 , 3 , 6, the middle portion of the spigot 30b extends outwardly along the length direction of the spoke 30 to form a latch 31, and the latch 31 is inserted into the middle groove 211 provided correspondingly in the slot 21. As shown in the accompanying drawings, Figure 5As shown, the middle groove 211 has a greater groove depth than the slot 21, and when the plug 31 is inserted into the groove 211, the spoke 30 is limited from rotating around the axis of the rim 20, and the spoke 30 and the rim 20 are limited in the circumferential direction of the rim 20.

[0024] The preferred embodiment is shown in the accompanying drawings Figure 6 As shown, the plug 31 is cylindrical, and when the plug 31 is assembled, the plug 31 can be inserted into the slot 21 without visual alignment, and the spoke 30 is more convenient to assemble. Similarly, the plug 31 can also be a circular truncated cone with a large base and a small overhanging end, and the side adjacent to the spoke body 30a is the base. In order to facilitate assembly, the maximum outer diameter of the plug 31 is less than or equal to the maximum thickness of the spoke body 30a.

[0025] Further, in order to avoid the spoke 30 rotating around its own length direction axis after the plug 30b is inserted into the slot 21, as shown in the accompanying drawings Figure 6 The two sides of the base of the plug 31 are symmetrically provided with anti-rotation thin blocks 32, and the outer diameter of the base of the plug 31 is greater than the thickness of the block body of the anti-rotation thin block 32, that is, the base of the plug 31 and the anti-rotation thin block 32 are block-shaped with a thick middle and thin sides, which can avoid the relative rotational displacement of the spoke 30 and the rim 20 around the core of the rim 20.

[0026] The preferred embodiment is shown in the accompanying drawings Figure 1 、 2 As shown, the three spokes 30 are arranged at equal angles around the circumference of the hub 10, and the two adjacent spokes 30 are provided with a plate-shaped petal 40, and the two ends of the petal 40 are respectively attached to or abut against the two adjacent spokes 30, and the petal 40 can effectively maintain the installation posture of the spoke 30. In fact, when the petal 40 is provided between the rim 20 and the hub 10 to transitionally connect the rim 20 and the hub 10, only one spoke 30 is provided and the plug 30b of the spoke 30 is connected to the rim 20 to limit the relative rotation between the rim 20 and the hub 10. In the present embodiment, three spokes 30 are provided, which can further reduce the shear force borne by a single plug 30b when the guide wheel rotates, thereby prolonging the reliability of the plug connection part between the spoke 30 and the rim 20. In other embodiments, the number of spokes 30 can be adjusted according to requirements.

[0027] In the present embodiment, the adjacent petal 40 and the adjacent side wall of the spoke 30 are attached or gap-connected, as shown in the accompanying drawings Figure 1 、 2As shown, the petal body 40 fills the space between adjacent spokes 30, which can limit the rotational displacement of the spokes 30 around the axis of the rim 20, thereby maintaining the spacing between adjacent spokes 30, improving the stability and reliability of the spoke 30 installation, and thereby improving the structural strength of the guide wheel body. When the inner end of the petal body 40 abuts the hub 10 and the outer end abuts the rim 20, the shape and posture of the rim 20 can be maintained to ensure the load-carrying capacity of the guide wheel body.

[0028] In this embodiment, the spoke 30 is overall rectangular strip-shaped, and the length direction of the spoke 30 coincides with the radial direction of the rim 20. Correspondingly, the petal body 40 provided between the two adjacent spokes 30 is overall fan-shaped, and the two end plate edges are straight edges, and the inner plate edge and the outer plate edge are arc-shaped edges. The inner plate edge of each petal body 40 is concentric, and the outer plate edge of each petal body 40 is concentric, so that the spoke 30 and the petal body 40 can form a wheel spoke that is overall ring plate-shaped.

[0029] Further, in this embodiment, the inner end of the petal body 40 is fixedly connected to the outer peripheral wall of the hub 10, and the outer end is in plug-in connection with the rim 20. As shown in the accompanying drawings, Figure 5 As shown, the inner side wall of the rim 20 is provided with a second slot 22 for the outer plate edge of the petal body 40 to be inserted into, and the slot opening of the second slot 22 points to the rim 20 core. As shown in the accompanying drawings, Figure 5 As shown, the slot cavities of the adjacent first slot 21 and second slot 22 are connected, that is, the inner ring of the rim 20 is provided with a continuous annular slot composed of the first slot 21 and the second slot 22. In order to reliably position the spoke 30 and avoid the failure of the connection between the spoke 30 and the rim 20, which causes the petal body 40 and the spoke 30 to rotate around the rim 20 core between the rim 20 and the hub 10, the slot bottoms of the first slot 21 and the second slot 22 can be arranged on different planes. As shown in the accompanying drawings, Figure 5 As shown, the distance between the slot bottom wall of the second slot 22 and the rim 20 core is less than the distance between the slot bottom wall of the first slot 21 and the rim 20 core. In other words, the slot depths of the first slot 21 and the second slot 22 are different, where the slot depth refers to the maximum size of the slot cavity in the radial direction of the rim 20. In this way, by only limiting the relative rotational displacement of the spoke 30 and the rim 20, the rotational displacement of the petal body 40 located between the spokes 30 relative to the rim 20 can be avoided. Correspondingly, as shown in the accompanying drawings, Figure 3 As shown, the distance between the outer plate edge of the petal body 40 and the rim 20 core is less than the distance between the outer end of the spoke 30 and the rim 20 core, that is, the preferred solution is that the outer plate edge of the petal body 40 is located on the inner side of the outer end surface of the spoke 30, and the slot bottom of the second slot 22 is located on the inner side of the slot bottom of the first slot 21. In another embodiment, the slot cavity width of the second slot 22 can also be less than the slot cavity width of the first slot 21, that is, the size of the second slot 22 in the thickness direction of the rim 20 is less than the size of the first slot 21 in the thickness direction of the rim 20. Correspondingly, the thickness of the petal body 40 used for the plug-in connection part with the rim 20 is less than the thickness of the plug-in head of the spoke 30.

[0030] For the convenience of processing, the inner plate edges of each petal body 40 are concentric, and the outer plate edges of each petal body 40 are concentric. When the concentric circle of the inner plate edges of each petal body 40 is arranged on the same axis as the concentric circle of the outer plate edges of each petal body 40, the diameter of the concentric circle of the inner plate edges of each petal body 40 should be greater than or equal to the outer diameter of the hub 10, and the diameter of the concentric circle of the outer plate edges of each petal body 40 should be less than or equal to the distance between the bottom wall of the second slot 22 and the center of the rim 20.

[0031] In the preferred embodiment, the concentric circle of the inner plate edges of each petal body 40 can be arranged eccentrically with the concentric circle of the outer plate edges of each petal body 40, and the eccentric distance between the concentric circle of the inner plate edges of each petal body 40 and the concentric circle of the outer plate edges of each petal body 40 is less than the depth of the second slot 22. In this way, the operator can easily insert the petal body 40 into the second slot 22, and the petal body 40 can also be prevented from easily coming out of the second slot 22. In addition, the eccentric arrangement of the inner and outer plate edges of the petal body 40 will cause the mass center of the spoke portion to be arranged eccentrically with the center of rotation of the installed wheel body, thereby increasing the moment of inertia of the wheel body. Although the starting force required for the rotation of the trend wheel body is increased, the stability of the guide wheel in the rotating state is high, the interaction force between the spoke 30 and the rim 10 is small, the shear force borne by the joint head 30b is small, thereby prolonging the service life of the spoke 30 and improving the reliability of the connection between the spoke 30 and the rim 10 after long-term use. In order to facilitate the production and installation of the guide wheel body, the concentric circle of the inner plate edges of the petal body 40 can be arranged on the same axis as the concentric circle of the outer plate edges of each petal body 40. In this way, when each spoke 30 is arranged at an equal angle interval around the rim 20, the shape profiles of each petal body 40 are completely consistent, which facilitates the processing of the petal body 40 and can reduce the production cost of the guide wheel. Furthermore, the diameter of the concentric circle of the inner plate edges of each petal body 40 can be made to match the outer diameter of the hub 10, and the concentric circle of the outer plate edges of each petal body 40 can be made to match the inner diameter of the bottom wall of the second slot 22 on the rim 20. In this way, the force borne by the rim 20 can be quickly and effectively transmitted to the hub 10 through the petal body 40, thereby providing radial support for the rim 20.

[0032] Specifically, the petal body 40 is in the shape of a fan, and the inner plate edges and the outer plate edges thereof are arc-shaped edges. As shown in FIG. 2, the inner plate edges of the petal body 40 are arranged on the same axis as the outer plate edges of the petal body 40, and the diameter of the concentric circle of the inner plate edges of the petal body 40 is greater than or equal to the outer diameter of the hub 10, and the diameter of the concentric circle of the outer plate edges of the petal body 40 is less than or equal to the distance between the bottom wall of the second slot 22 and the center of the rim 20. Figure 3As shown, the inner end of the spoke 30 is protruded between the two petals 40, and the distance between the inner end of the spoke 30 and the rim 20 core is smaller than the distance between the inner plate edge of the petals 40 and the rim 20 core. When the spoke 30 abuts against the outer peripheral wall of the hub 10, the inner plate edge of the petals 40 is arranged in a spaced manner from the outer peripheral wall of the hub 10. This is because the size of the petals 40 needs to be smaller than the gap between the spokes 30 so as to connect the spokes 30 and the petals 40 in a plug-in manner inside the rim 20. In the embodiment, the petals 40 are mainly used to maintain the installation posture of the spokes 30 and provide lateral support for the spokes 30. Further, in order to reduce the weight of the guide wheel and make the guide wheel more portable and easy to use, the weight-reducing holes 41 are arranged on the petals 40, and the plate thickness of the petals 40 is smaller than or equal to the thickness of the exposed spoke body 30a of the spoke 30 arranged between the hub 10 and the rim 20.

[0033] In specific implementation, the inner end of the spoke 30 is welded to the hub 10 to achieve effective connection of the components of the guide wheel. In order to improve the reliability of the guide wheel structure, the inner plate edge of the petals 40 can be matched with the outer peripheral wall of the hub 10, and the inner end plate edge of the petals 40 is welded to the hub 10, that is, as shown in the attached Figure 1 As shown, the welding seam is arranged continuously in the circumferential direction of the hub 10 to achieve reliable connection of the petals 40, the inner end of the spoke 30 and the hub 10.

Claims

1. A guide wheel, characterized by: The application relates to a wheel structure, which comprises a tubular hub (10) and a ring-shaped rim (20), the hub (10) and the rim (20) being connected by spokes (30), the inner ends of the spokes (30) being fixedly connected with the hub (10), and the outer ends of the spokes (30) being connected with the rim (20) in a plug-in mode, and the hub (10) and the rim (20) being in a circumferential limiting fit. The spokes (30) comprise a spoke body (30a) arranged between the hub (10) and the rim (20) and a plug-in head (30b) extending into the body of the rim (20), the inner side wall of the rim (20) is provided with a first slot (21) matching the outer contour of the plug-in head (30b), and the slot opening of the first slot (21) is directed to the core of the rim (20); and the spokes (30) are arranged along the radial direction of the rim (20).

2. The guide wheel of claim 1, wherein: The plug-in head (30b) is symmetrically arranged relative to the middle plane in the thickness direction of the spokes (30).

3. The guide wheel of claim 1, wherein: The plug-in head (30b) is in a block shape with a thick middle part and thin two sides in the circumferential direction of the wheel body, and the thickness of the middle part of the plug-in head (30b) is less than or equal to the maximum thickness of the spoke body (30a).

4. The guide wheel of claim 1, wherein: The plug-in head (30b) is in a convex block shape with a long middle part and short two sides in the radial direction of the wheel body; the middle part of the plug-in head (30b) extends outward along the length direction of the spokes (30) to form a plug-in pin (31), the plug-in pin (31) is inserted into a corresponding middle groove (211) of the first slot (21) and forms a limiting fit in the circumferential direction of the rim (20).

5. A guide wheel according to claim 4, characterised in that: The plug-in pin (31) is in a cylindrical shape or a circular truncated cone shape with a large base and a small overhanging end; the maximum outer diameter of the plug-in pin (31) is less than or equal to the maximum thickness of the spoke body (30a).

6. The guide wheel of claim 4, wherein: Two symmetrical anti-rotation thin blocks (32) are arranged on the two sides of the base of the plug-in pin (31), and the outer diameter of the base of the plug-in pin (31) is greater than the thickness of the block of the anti-rotation thin block (32).

7. A guide wheel according to any one of claims 1-6, characterized in that: The spokes (30) are arranged at equal angles around the hub (10) in two or more numbers, and a plate-shaped petal body (40) is arranged between two adjacent spokes (30).

8. A guide wheel according to claim 7, characterised in that: The spokes (30) are in a rectangular strip shape, and the length direction of the spokes (30) is consistent with the radial direction of the rim (20); the petal body (40) is in a fan shape, the two end plate edges of the petal body (40) are straight edges, the inner plate edge and the outer plate edge are arc edges, the inner plate edges of the petal bodies (40) are concentric, and the outer plate edges of the petal bodies (40) are concentric.

9. The guide wheel of claim 7, wherein: The inner end of the petal body (40) is fixedly connected with the outer peripheral wall of the hub (10), and the outer end of the petal body (40) is in plug-in fit with the rim (20); the inner side wall of the rim (20) is provided with a second slot (22) for inserting the outer plate edge of the petal body (40), and the slot opening of the second slot (22) is directed to the core of the rim (20); the slot cavities of the adjacent first slot (21) and the second slot (22) are communicated, the plate thickness of the petal body (40) is less than or equal to the thickness of the spoke body (30a) arranged between the hub (10) and the rim (20), and a weight-reducing hole (41) is arranged on the petal body (40).

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