Stepless speed change driven wheel of wheat machine

Abstract

The utility model provides a wheat machine stepless speed change driven wheel which comprises a main shaft barrel, a fixed disc fixing disc is fixed to one end of the main shaft barrel, and a belt fixed disc is fixed to one side of the fixed disc fixing disc. The middle of the main shaft barrel is sleeved with a belt driving disc, an extension barrel is further fixed to the middle of the side, away from the belt fixed disc, of the belt driving disc, the extension barrel is sleeved with a return spring, a blocking piece is fixed to the other end of the main shaft barrel, one end of the return spring makes contact with the belt driving disc, and the other end of the return spring makes contact with the blocking piece. According to the utility model, the main shaft cylinder supports the leather driving disc to slide, and the main shaft cylinder is used for being mounted on the driven shaft, so that the length of the contact surface between the whole driven wheel and the driven shaft is increased, the stability of the driven shaft is improved, and the vibration of the driven shaft caused by the overlong driven shaft and the sliding of the leather driving disc on the suspended section of the driven shaft during speed change is avoided; the vibration abnormal sound and the failure rate are effectively reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of continuously variable transmission (CVT) discs for wheat harvesters, specifically to a continuously variable transmission passive wheel for wheat harvesters. Background Technology

[0002] The continuously variable transmission (CVT) disc pulley is a crucial working component of a wheat harvester. Its primary function is to adjust the transmission ratio of the engine power to the drum housing, meeting the needs of different operating speeds and terrain conditions. During operation, by changing the position of the belt on the CVT drive pulley and the driven pulley, the transmission ratio between the drive and driven pulleys is altered, thereby adjusting the speed at which the engine power is transmitted to the drum housing. However, currently available CVT driven pulleys commonly suffer from oil leaks, vibrations and abnormal noises, short service life, and high failure rates. Utility Model Content

[0003] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0004] This utility model provides a continuously variable transmission (CVT) driven wheel for a wheat harvester, including a main shaft cylinder. A fixed plate is fixed to one end of the main shaft cylinder, and a belt plate is fixed to one side of the fixed plate. A belt drive plate is sleeved in the middle of the main shaft cylinder, and an extension cylinder is fixed in the middle of the side of the belt drive plate away from the belt plate. A return spring is sleeved on the extension cylinder. A blocking member is fixed to the other end of the main shaft cylinder. One end of the return spring contacts the belt drive plate, and the other end of the return spring contacts the blocking member.

[0005] The beneficial effects of this utility model are:

[0006] This invention utilizes a main spindle cylinder to support the sliding of the belt drive disc. The main spindle cylinder is mounted on the driven shaft, increasing the overall contact surface length between the driven wheel and the driven shaft. This improves the stability of the driven shaft and prevents vibration caused by an excessively long driven shaft and the belt drive disc sliding in the suspended section of the driven shaft during speed changes. This effectively reduces vibration, noise, and failure rate, extending service life. Furthermore, the fixed installation of the belt drive disc via a fixed plate reduces the size and complexity of the belt drive disc and main spindle cylinder, lowering manufacturing costs and facilitating installation.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, an annular lubrication groove is provided in the middle of the inner side of the extension cylinder, and sealing rings are fixed at both ends of the inner side of the extension cylinder, with the sealing rings in sealing contact with the outer surface of the main shaft cylinder.

[0009] During installation, the lubrication groove can be filled with grease to improve the lubrication between the extension sleeve and the main spindle sleeve, reduce wear and vibration, lower the failure rate, and extend the service life; at the same time, the sealing ring reduces grease leakage, prevents oil leakage, and improves reliability.

[0010] Furthermore, the spindle cylinder is provided with at least two grease injection channels. One end of the grease injection channel extends to the middle of the spindle cylinder and communicates with the lubrication groove. The other end of the grease injection channel extends to the other end of the spindle cylinder and is fixed with an oil cup.

[0011] During maintenance, grease can be added to the lubrication groove through the grease cup and grease channel. With two grease channels, one grease channel and grease cup can be used for air supply, and the other can be used for grease injection. This prevents difficulties in injecting grease due to excessive air pressure, improves the lubrication capability of the extension cylinder and the main spindle cylinder for continuous operation, and extends the service life of the extension cylinder and the main spindle cylinder.

[0012] Furthermore, the other end of the main spindle is provided with an inner spline bushing, which extends into the main spindle and is fixedly connected to the main spindle.

[0013] The internal spline bushing can be connected to the driven shaft, increasing the overall contact surface length between the driven wheel and the driven shaft, thus improving the stability of the driven shaft.

[0014] Furthermore, the outer periphery of the inner spline bushing is provided with an annular protrusion, and the side of the blocking member away from the main shaft cylinder contacts the annular protrusion; the other end of the grease injection channel passes through the blocking member and extends to the outer periphery of the annular protrusion, and the grease cup is fixed on the annular protrusion.

[0015] The annular protrusions of the main spindle cylinder and the inner spline bushing form a clamping structure for the blocking component, which increases the connection strength between the blocking component and the main spindle cylinder and improves the blocking component's ability to withstand the spring force of the return spring. At the same time, it adds a corner to the grease injection channel, which increases the resistance to grease leakage and prevents oil leakage. In addition, the grease injection channel runs through two parts, resulting in low processing costs.

[0016] Furthermore, a moving disc limiting ring is fixed on the side of the belt drive disc away from the fixed disc, and a fixed disc limiting ring is fixed on the side of the blocking member facing the belt drive disc. A first limiting tooth is fixed on the end of the fixed disc limiting ring facing the moving disc limiting ring, and a second limiting tooth is fixed on the end of the moving disc limiting ring facing the fixed disc limiting ring. The first limiting tooth and the second limiting tooth extend into each other's gap.

[0017] When the driven wheel drive is overloaded, the first limit tooth contacts the second limit tooth, thereby preventing the moving disc limit ring from continuing to rotate. This avoids the belt slippage caused by the belt driving the disc to rotate independently of the belt fixed disc. This improves the reliability of the continuously variable transmission driven wheel drive.

[0018] Furthermore, the fixed plate limiting ring is connected to the blocking member by a headless screw, and the moving plate limiting ring is connected to the leather moving plate by a headless screw.

[0019] Easy to install, and the headless screw will not interfere with moving parts such as the limit ring, thus avoiding vibration and abnormal noise.

[0020] Furthermore, the blocking component is an end cap, the open end of which extends toward the leather drive disc, and the extension tube and the return spring both extend into the end cap.

[0021] It facilitates the protection of components such as the return spring mounted on the extension tube, prevents foreign objects from entering the space where the moving plate positioning ring and the fixed plate positioning ring are located, thus avoiding vibration and abnormal noise, and is easy to install.

[0022] Furthermore, the side of the belt drive disc away from the belt fixed disc is provided with an annular groove, which is arranged around the extension cylinder. The open end of the end cap extends into the annular groove, and the outer periphery of the end cap is sealed to the side wall of the annular groove by a dustproof sealing ring. The end cap is filled with grease.

[0023] Grease can improve the lubrication between the return spring, the fixed ring of the plate and the extension cylinder, and reduce wear and vibration noise during speed change and overload. At the same time, the end cap can protect the return spring and other parts and grease on the extension cylinder, making it easier to adapt to the harsh working environment of the wheat harvester, preventing dust, rain and other media from entering and corroding the grease and parts, and reducing the failure rate.

[0024] Furthermore, the outer peripheral surface of the end cap is provided with an electrophoretic corrosion-resistant layer; the outer surface of the main shaft cylinder is provided with a quenching layer and a chromium plating layer.

[0025] The electrophoretic corrosion-resistant layer improves the wear resistance and corrosion resistance of the outer periphery of the end cover, effectively preventing the end cover from rusting in the harsh working environment of the wheat harvester and causing the dustproof sealing ring to fail, thus avoiding oil leakage on the outside of the end cover. The hardening and chrome plating of the outer surface of the main shaft cylinder increases the surface hardness of the main shaft cylinder. Under the long-term unidirectional force of the belt drive disc, the wear caused by its sliding along the main shaft cylinder is greatly reduced, the failure rate of jamming and abnormal noise is reduced, and the service life of the continuously variable transmission driven wheel of the wheat harvester is extended by 45%. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the surface structure of this utility model.

[0027] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0028] Figure 3 This is a structural diagram of the present invention in its installed state.

[0029] In the accompanying drawings, the technical features represented by each reference numeral are as follows:

[0030] 1-Main spindle cylinder; 2-Belt fixed plate; 3-Belt driven plate; 4-Fixed plate fixing plate; 5-Extension cylinder; 6-Return spring; 7-Blocking component; 8-Inner spline bushing; 9-Annular protrusion; 10-Lubrication groove; 11-Grease injection channel; 12-Oil cup; 13-Dustproof sealing ring; 14-Moving plate limit ring; 15-Fixed plate limit ring;

[0031] 20 - Passive axis. Detailed Implementation

[0032] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0033] This utility model refers to Figure 1-3 .

[0034] This utility model provides a continuously variable transmission (CVT) passive wheel for a wheat harvester, including a main shaft cylinder 1. One end of the main shaft cylinder 1 is fixed with a fixed plate 4, and a belt fixed plate 2 is fixed to one side of the fixed plate 4. A belt drive plate 3 is sleeved in the middle of the main shaft cylinder 1. An extension cylinder 5 is also fixed in the middle of the side of the belt drive plate 3 away from the belt fixed plate 2. A return spring 6 is sleeved on the extension cylinder 5. A blocking member 7 is fixed to the other end of the main shaft cylinder 1. One end of the return spring 6 contacts the belt drive plate 3, and the other end of the return spring 6 contacts the blocking member 7.

[0035] When installing the continuously variable transmission passive wheel of the wheat harvester of this utility model, the main shaft cylinder 1 is sleeved on the passive shaft 20 of the wheat harvester. The main shaft cylinder 1 and the passive shaft 20 can be connected by spline transmission. The passive shaft 20 is used to transmit power to the drum box.

[0036] During operation, the continuously variable transmission (CVT) driven pulley is connected to the external driving pulley via belt drive. The conical surfaces of the belt fixed disc 2 and the belt driven disc 3 on opposite sides engage with the belt. The driving pulley drives the belt fixed disc 2 and the belt driven disc 3 to rotate via the belt. The moving disc of the driving pulley is hydraulically controlled to move closer to or away from the fixed disc, thereby adjusting the transmission ratio. The driving pulley is a conventional structure. Specifically, when the moving disc of the driving pulley moves closer to the fixed disc, its effective radius increases, and the tension of the belt on the belt fixed disc 2 and the belt driven disc 3 increases. This causes the belt driven disc 3 to move away from the belt fixed disc 2, compressing the return spring 6 and causing the belt to move towards the smaller end of the conical surfaces of the belt fixed disc 2 and the belt driven disc 3, thus reducing the effective radius and the transmission ratio. Conversely, when the moving disc of the driving pulley moves away from the fixed disc, its effective radius decreases, and the tension of the belt on the belt fixed disc 2 and the belt driven disc 3 decreases. This causes the return spring 6 to push the belt driven disc 3 closer to the belt fixed disc 2, causing the belt to move towards the larger end of the conical surfaces of the belt fixed disc 2 and the belt driven disc 3, thus increasing the effective radius and the transmission ratio.

[0037] In the above working process, the sliding of the belt drive disc 3 is supported by the main spindle cylinder 1, and the main spindle cylinder 1 is used to install on the driven shaft 20, which increases the length of the contact surface between the driven wheel and the driven shaft 20, improves the stability of the driven shaft 20, and avoids the vibration of the driven shaft 20 caused by the excessive length of the driven shaft 20 and the sliding of the belt drive disc 3 in the suspended section of the driven shaft 20 during speed change. This effectively reduces vibration and noise and failure rate, and extends service life. In addition, the belt fixed disc 2 is fixedly installed by the fixed disc 4, which reduces the size and complexity of the workpiece required for the belt fixed disc 2 and the main spindle cylinder 1, reduces manufacturing costs, and facilitates installation.

[0038] Furthermore, the extension cylinder 5 has an annular lubrication groove 10 in the middle of its inner side, and sealing rings are fixed at both ends of the inner side of the extension cylinder 5, with the sealing rings in sealing contact with the outer surface of the main shaft cylinder 1.

[0039] Preferably, the sealing ring at the end of the extension cylinder 5 closest to the belt disc 2 is a dustproof sealing ring, and the sealing ring at the end furthest from the belt disc 2 is an O-ring.

[0040] During installation, the lubrication groove 10 can be filled with grease to improve the lubrication between the extension cylinder 5 and the main shaft cylinder 1, reduce wear and vibration, lower the failure rate, and extend the service life. At the same time, the sealing ring reduces grease leakage, prevents oil leakage, and improves reliability.

[0041] Furthermore, the spindle cylinder 1 is provided with at least two grease injection channels 11. One end of the grease injection channel 11 extends to the middle of the spindle cylinder 1 and communicates with the lubrication groove 10. The other end of the grease injection channel 11 extends to the other end of the spindle cylinder 1 and is fixed with an oil cup 12.

[0042] During maintenance, grease can be added to the lubrication groove 10 through the grease cup 12 and the grease channel 11. Through the two grease channels 11, one grease channel 11 and the grease cup 12 can be used for air supply, and the other can be used for oil injection. This prevents difficulties in injecting grease caused by excessive air pressure, improves the lubrication capacity of the extension cylinder 5 and the main shaft cylinder 1 for continuous operation, and extends the service life of the extension cylinder 5 and the main shaft cylinder 1.

[0043] Furthermore, the other end of the main spindle cylinder 1 is also provided with an inner spline bushing 8, which extends into the main spindle cylinder 1 and is fixedly connected to the main spindle cylinder 1.

[0044] Preferably, the outer side of the inner spline bushing 8 is fixed to the inner side of the main spindle cylinder 1 with an interference fit. This facilitates assembly.

[0045] The internal spline bushing 8 can be connected to the driven shaft 20 for transmission, which increases the length of the contact surface between the driven wheel and the driven shaft 20 and improves the stability of the driven shaft 20.

[0046] Furthermore, the outer periphery of the inner spline bushing 8 is provided with an annular protrusion 9, and the side of the blocking member 7 away from the main shaft cylinder 1 contacts the annular protrusion 9; the other end of the grease injection channel 11 passes through the blocking member 7 and extends to the outer periphery of the annular protrusion 9, and the oil cup 12 is fixed on the annular protrusion 9.

[0047] The annular protrusion 9 of the main spindle cylinder 1 and the inner spline bushing 8 forms a clamping structure with the blocking member 7, which increases the connection strength between the blocking member 7 and the main spindle cylinder 1 and improves the resistance of the blocking member 7 to the elastic force of the return spring 6; at the same time, it adds a corner to the grease injection channel 11, which increases the resistance to grease leakage and prevents oil leakage; and the grease injection channel 11 runs through the two parts, resulting in low processing cost.

[0048] Furthermore, a moving disc limiting ring 14 is fixed on the side of the belt drive disc 3 away from the belt fixed disc 2, and a fixed disc limiting ring 15 is fixed on the side of the blocking member 7 facing the belt drive disc 3. A first limiting tooth is fixed on the end of the fixed disc limiting ring 15 facing the moving disc limiting ring 14, and a second limiting tooth is fixed on the end of the moving disc limiting ring 14 facing the fixed disc limiting ring 15. The first limiting tooth and the second limiting tooth extend into each other's gap.

[0049] Note: Both the first and second limiting teeth are arranged in multiple evenly spaced intervals along the circumference. The first limiting tooth extends into the gap between two second limiting teeth, and the second limiting tooth extends into the gap between two first limiting teeth at the same time.

[0050] When the driven wheel drive is overloaded, the first limit tooth contacts the second limit tooth, thereby preventing the moving disc limit ring 14 from continuing to rotate. This avoids the belt slippage caused by the belt driving disc 3 rotating independently of the belt fixed disc 2, thus improving the reliability of the continuously variable transmission driven wheel drive.

[0051] Furthermore, the fixed plate limiting ring 15 is connected to the blocking member 7 by a headless screw, and the moving plate limiting ring 14 is connected to the leather moving plate 3 by a headless screw.

[0052] Easy to install, and the headless screw will not interfere with moving parts such as the limit ring, thus avoiding vibration and abnormal noise.

[0053] Furthermore, the blocking member 7 is an end cap, the open end of which extends toward the leather drive disc 3, and the extension cylinder 5 and the return spring 6 both extend into the end cap.

[0054] It facilitates the protection of components such as the return spring 6 fitted on the extension tube 5, prevents foreign objects from entering the space where the moving plate positioning ring and the fixed plate positioning ring are located, thus avoiding vibration and abnormal noise, and is easy to install.

[0055] Furthermore, the belt drive disc 3 is provided with an annular groove on the side away from the belt fixed disc 2. The annular groove is arranged around the extension cylinder 5. The open end of the end cap extends into the annular groove. The outer periphery of the end cap is sealed to the side wall of the annular groove by a dustproof sealing ring 13. The end cap is filled with grease.

[0056] Preferably, the grease inside the end cap is molybdenum disulfide grease. The end cap is made of ductile iron.

[0057] The grease can improve the lubrication between the return spring 6, the fixed ring of the plate and the extension cylinder 5, and reduce wear and vibration noise during speed change and overload. At the same time, the end cap can protect the return spring 6 and other parts and the grease on the extension cylinder 5, making it easier to adapt to the harsh working environment of the wheat harvester, preventing dust, rain and other media from entering and corroding the grease and parts, and reducing the failure rate.

[0058] Furthermore, the outer peripheral surface of the end cap is provided with an electrophoretic corrosion-resistant layer; the outer surface of the main shaft cylinder 1 is provided with a quenching layer and a chromium plating layer.

[0059] Note: The electrophoretic corrosion-resistant layer is a corrosion-resistant substance such as paint applied by the electrophoretic process. Preferably, the belt fixed plate 2, the belt drive plate 3, and the end cover are all made of ductile iron, which is low in cost; the main shaft cylinder 1 and the fixed plate 4 are made of forged steel in one piece.

[0060] The electrophoretic corrosion-resistant layer improves the wear resistance and corrosion resistance of the outer periphery of the end cover, effectively preventing the end cover from rusting in the harsh working environment of the wheat harvester and causing the dustproof sealing ring 13 to fail, thus avoiding the failure of oil leakage on the outside of the end cover. The hardening and chrome plating of the outer surface of the main shaft cylinder 1 increases the hardness of the outer surface of the main shaft cylinder 1. Under the long-term unidirectional force of the belt drive disc 3, the wear caused by its sliding along the main shaft cylinder 1 is greatly reduced, the failure rate of jamming and abnormal noise is reduced, and the service life of the continuously variable transmission driven wheel of the wheat harvester is extended by 45%.

[0061] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0062] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0064] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0065] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A continuously variable passive wheel for a wheat machine, characterised in that: The device includes a main spindle (1), one end of which is fixed with a fixed plate (4), and a belt fixed plate (2) is fixed on one side of the fixed plate (4); a belt drive plate (3) is sleeved in the middle of the main spindle (1), and an extension cylinder (5) is fixed in the middle of the side of the belt drive plate (3) away from the belt fixed plate (2). A return spring (6) is sleeved on the extension cylinder (5), and a blocking member (7) is fixed at the other end of the main spindle (1). One end of the return spring (6) contacts the belt drive plate (3), and the other end of the return spring (6) contacts the blocking member (7).

2. The continuously variable passive wheel for a wheat machine according to claim 1, characterized in that: The extension cylinder (5) has an annular lubrication groove (10) in the middle of its inner side, and sealing rings are fixed at both ends of the inner side of the extension cylinder (5). The sealing rings are in sealing contact with the outer surface of the main shaft cylinder (1).

3. The continuously variable transmission driven wheel for wheat harvesters according to claim 2, characterized in that: The main spindle (1) is also provided with at least two grease injection channels (11). One end of the grease injection channel (11) extends to the middle of the main spindle (1) and communicates with the lubrication groove (10). The other end of the grease injection channel (11) extends to the other end of the main spindle (1) and is fixed with an oil cup (12).

4. The continuously variable passive wheel of claim 3, wherein: The other end of the main spindle (1) is also provided with an inner spline bushing (8), which extends into the main spindle (1) and is fixedly connected to the main spindle (1).

5. A continuously variable passive wheel for a wheat machine according to claim 4, characterised in that: The inner spline bushing (8) has an annular protrusion (9) on its outer periphery. The side of the blocking member (7) away from the main shaft cylinder (1) contacts the annular protrusion (9). The other end of the grease injection channel (11) passes through the blocking member (7) and extends to the outer periphery of the annular protrusion (9). The oil cup (12) is fixed on the annular protrusion (9).

6. The continuously variable passive wheel of claim 1, wherein: The side of the belt drive disc (3) away from the belt fixed disc (2) is also fixed with a moving disc limiting ring (14), and the side of the blocking member (7) facing the belt drive disc (3) is also fixed with a fixed disc limiting ring (15). The end of the fixed disc limiting ring (15) facing the moving disc limiting ring (14) is fixed with a first limiting tooth, and the end of the moving disc limiting ring (14) facing the fixed disc limiting ring (15) is fixed with a second limiting tooth. The first limiting tooth and the second limiting tooth extend into each other's gap.

7. A continuously variable passive wheel for a wheat machine according to claim 6, characterised in that: The fixed plate limiting ring (15) and the blocking member (7) are connected by a headless screw, and the moving plate limiting ring (14) and the leather moving plate (3) are connected by a headless screw.

8. The continuously variable passive wheel of claim 6, wherein: The blocking member (7) is an end cap, the open end of which extends toward the leather drive disc (3), and the extension tube (5) and the return spring (6) both extend into the end cap.

9. A continuously variable passive wheel for a wheat machine according to claim 8, characterised in that: The belt drive disc (3) is provided with an annular groove on the side away from the belt fixed disc (2). The annular groove is arranged around the extension cylinder (5). The open end of the end cap extends into the annular groove. The outer periphery of the end cap and the side wall of the annular groove are sealed together by a dustproof sealing ring (13). The end cap is filled with grease.

10. A continuously variable passive wheel for a wheat machine according to claim 9, characterised in that: The outer circumferential surface of the end cap is provided with an electrophoretic corrosion resistant layer; the outer surface of the main shaft cylinder (1) is provided with a quenching layer and a chromium plating layer.

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