Saw chain guide bar nose

Abstract

The present application discloses a saw chain guide bar nose. The saw chain guide bar nose is arranged at the tip of a saw chain guide bar. The saw chain guide bar nose comprises support plates (1), a rotating structure (2), a sprocket (3), and a lubricating structure (4); there are two support plates (1), each support plate (1) is provided with a mounting recess (11), and a guide groove (12) is formed between the two support plates (1); the rotating structure (2) is mounted on the support plates (1) and is located in the mounting recesses (11); the sprocket (3) is sleeved on the rotating structure (2) and is in contact with recess walls of the mounting recesses (11); and the lubricating structure (4) is disposed on the rotating structure (2) and the sprocket (3). In the present application, by means of the arrangement of the lubricating structure (4), the rotating structure (2) can be lubricated, so that the rotating structure (2) undergoes wet friction, and the friction force during rotation of the rotating structure (2) is reduced, thereby prolonging the service life of the rotating structure (2), and thus prolonging the service life of the saw chain guide bar nose.

Description

A saw chain guide head Technical Field

[0001] This application relates to the field of saw chain guide technology, specifically to a saw chain guide head. Background Technology

[0002] The saw chain guide head is a key component of a saw chain (including chainsaws and cordless chainsaws). It is usually located at the end of the guide plate and has a variety of important functions and uses. The guide head can be integrally machined with the saw chain guide body, or it can be machined separately and then assembled together using specific connection methods (such as bolts, welding, etc.).

[0003] The saw chain guide head is usually designed to fit snugly against the tip of the guide plate, and has sufficient strength and rigidity to withstand the impact force of the saw chain. It is generally made of wear-resistant and corrosion-resistant metal materials, such as high-strength alloy steel.

[0004] Existing saw chain guide heads generally include a sprocket, a guide head body, a rotating shaft mounted on the guide head body, and needle rollers arranged around the rotating shaft between the rotating shaft and the sprocket. However, these existing saw chain guide heads lack a lubrication structure, requiring manual lubrication by the user. Furthermore, the lubricating oil is quickly splashed away during use, failing to provide effective lubrication. This results in dry friction between the sprocket and the needle rollers, reducing the service life of the needle rollers or sprocket and severely impacting the service life of the guide head.

[0005] Therefore, there is an urgent need to provide a guide head that can lubricate the friction between the sprocket and the roller (needle roller) to extend the service life of existing guide heads.

[0006] Utility Model Content

[0007] The purpose of this application is to propose a saw chain guide head that solves the problem of dry friction between existing sprockets and rollers in the prior art.

[0008] To achieve the above objectives, this application proposes a saw chain guide head, which is disposed at the end of a saw chain guide. The saw chain guide head includes a support plate, a rotating structure, a sprocket, and a lubrication structure. Two support plates are provided, each with a mounting groove, and a guide groove is formed between the two support plates. The rotating structure is mounted on the support plate and located within the mounting groove. The sprocket is fitted onto the rotating structure and connected to the rotating component of the rotating structure. The rotating structure and the sprocket are equipped with lubrication structures.

[0009] Optionally, the support plate includes a connecting part for connecting with the saw chain guide plate, and a mounting part integrally formed with the connecting part, wherein the mounting groove is provided on the mounting part.

[0010] Optionally, the distance between the bottoms of the mounting grooves on the two support plates is less than or equal to twice the width of the guide groove.

[0011] Optionally, the mounting groove is a circular groove, and the depth of the mounting groove is less than the thickness of the support plate.

[0012] Optionally, the rotating structure includes a reference circular block mounted on a support plate and located in a mounting groove, and a rolling element disposed on the outer wall of the reference circular block, the rolling element being in contact with a sprocket.

[0013] Optionally, the rotating structure includes a reference circular block mounted on a support plate and located in a mounting groove, a rolling element surrounding a rolling element disposed on the outer wall of the reference circular block, a concentric outer ring concentrically disposed with respect to the rolling element and the reference circular block, the outer wall of the concentric outer ring being in contact with a sprocket.

[0014] Optionally, the sprocket includes a sprocket body, a through hole corresponding to the rotating structure at the center of the sprocket body, and limiting rings on both sides of the sprocket body. The limiting rings are located at the openings of the through hole, and the outer surface of the limiting rings contacts the groove wall of the mounting groove.

[0015] Optionally, the sprocket includes a sprocket body, a through hole corresponding to the rotating structure at the center of the sprocket body, and grooves on both sides of the sprocket body.

[0016] Optionally, a sprocket retaining ring corresponding to the groove of the sprocket body is installed on the outer ring wall of the concentric outer ring.

[0017] Optionally, the height of the rolling element is greater than the width of the guide groove.

[0018] Optionally, the sprocket body can be a toothed sprocket or a grooved sprocket, and the lubrication structure is disposed on a reference circular block, or on the reference circular block and the sprocket; the lubrication structure includes a lubrication cavity formed between the inner wall of the sprocket and the reference circular block.

[0019] Optionally, the lubrication structure further includes a limiting ring disposed on the reference circular block.

[0020] Compared with the prior art, this application provides a saw chain guide head, which has the following beneficial effects:

[0021] The saw chain guide head, through the setting of the lubrication structure, can lubricate the rotating structure, allowing the rotating structure to undergo wet friction, reducing the friction force when the rotating structure rotates, thereby extending the service life of the rotating structure, and thus extending the service life of the saw chain guide head. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the overall structure of the saw chain guide head of this application.

[0023] Figure 2 is a schematic diagram of the internal structure of the saw chain guide head of this application.

[0024] Figure 3 is a schematic diagram of the sprocket structure of this application.

[0025] Figure 4 is a structural schematic diagram of the support plate of this application.

[0026] Figure 5 is a schematic diagram of the rotating structure and sprocket of this application.

[0027] Figure 6 is a schematic diagram showing the position of the saw chain guide head on the guide plate in this application.

[0028] Figure 7 is a schematic diagram of the sprocket structure in Embodiment 2 of this application.

[0029] Figure 8 is another structural schematic diagram of the sprocket in Embodiment 2 of this application.

[0030] Figure 9 is a schematic diagram of the rotating structure and sprocket in Embodiment 3 of this application.

[0031] Figure 10 is a schematic diagram of the rotating structure and sprocket in Embodiment 4 of this application.

[0032] Figure 11 is a schematic diagram of the rotating structure in Embodiment 4 of this application.

[0033] Figure 12 is a schematic diagram of the rotating structure in Embodiment 5 of this application.

[0034] Figure 13 is a schematic diagram of the rotating structure in Embodiment 6 of this application.

[0035] The diagram shows the following markings: 1. Support plate; 11. Groove; 12. Guide groove; 13. Connecting part; 14. Mounting part; 2. Rotating structure; 21. Reference block; 211. Heat dissipation hole; 22. Rolling element; 23. Concentric outer ring; 24. Sprocket retaining ring; 3. Sprocket; 31. Sprocket body; 32. Through hole; 33. Limiting ring; 34. Groove; 4. Lubrication structure; 41. Lubrication cavity; 42. Limiting ring; 43. Oil passage hole. Detailed Implementation

[0036] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, illustrates the present invention. Numerous specific details are set forth in the description below to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] The saw chain guide head of this application can be used in saw chain guides and other similar applications. The following is a detailed description of a saw chain guide head.

[0038] Example 1

[0039] Referring to Figures 1-6, a structural schematic diagram of a preferred embodiment of a saw chain guide head according to this application is shown. The saw chain guide head includes two support plates 1, a rotating structure 2 mounted on the support plates 1, a sprocket 3 fitted onto the rotating structure 2, and a lubrication structure 4 disposed on the rotating structure 2 and the sprocket 3. The two support plates 1 are provided with mounting grooves 11, the rotating structure 2 is disposed within the mounting grooves 11, and a guide groove 21 is formed between the two support plates 1 for guiding and limiting the chain.

[0040] It should be noted that the guide plate head in this application can be set on one end of the guide plate body by riveting or integral molding with the guide plate body.

[0041] This application, through the setting of the rotating structure 2, and the subsequent mounting of the sprocket 3 onto the rotating structure 2, allows the sprocket 3 to rotate under the traction of the sprocket. The lubrication structure 4 lubricates the rotating structure 2, enabling wet friction and reducing frictional force during rotation, thus minimizing frictional and energy losses and extending its service life. This ensures the chain feed speed and, consequently, extends the service life of the guide plate head 2. The mounting groove 11 defines the positions of the rotating structure 2 and the sprocket 3, and allows for an increase in the overall thickness of the rotating structure 2, thereby increasing its load-bearing capacity, which in turn increases the load-bearing capacity of the sprocket 3 and the overall load-bearing capacity of the guide plate.

[0042] Referring to Figures 1-4, in this application, the support plate 1 includes a connecting part 13 for connecting with the saw chain guide plate, an installation part 14 integrally formed with the connecting part 13, and an installation groove 11 disposed on the installation part 14; the distance between the bottom of the installation grooves 11 on the two support plates 1 is less than or equal to twice the width of the guide groove 12.

[0043] This application uses the connecting part 13 to connect the support plate 1 to the saw chain guide plate, and the connection method can be riveting; the mounting part 14 is integrally set on the connecting part 13, thereby ensuring the overall strength of the support plate 1.

[0044] Referring to Figures 1-5, in this application, the mounting groove 11 is a circular groove, and the depth of the mounting groove 11 is less than the thickness of the support plate 1. By setting the mounting groove 11 in a circle, this application ensures that the rotating structure 2 can be installed while ensuring that the sprocket 3 can be fitted onto the rotating structure 2, and reduces the processing difficulty.

[0045] Referring to Figures 1-5, in this application, the rotating structure 2 includes a reference circular block 21 mounted on the support plate 1 and located in the mounting groove 11, and a rolling element 22 surrounding the outer wall of the reference circular block 21, which is in contact with the sprocket 3.

[0046] This application uses a reference circular block 21 as the rotation axis, meaning the central axis of the reference circular block 21 is the rotation center axis of the sprocket 3. This ensures that the rolling element 22 will not move during use, allowing the sprocket to rotate normally. By using the rolling element 22, sliding friction is changed to rolling friction, reducing the frictional force when the sprocket 3 rotates, thereby reducing wear during rotation and extending the service life of the rotating structure 2. It should be noted that in this example, the rolling element 22 is cylindrical.

[0047] As shown in Figures 1-5, in this application, the sprocket 3 includes a sprocket body 31, a through hole 32 corresponding to the rotating structure 2 at the center of the sprocket body 31, and limiting rings 33 on both sides of the sprocket body 31. The limiting rings 33 are located at the opening of the through hole 32, and the outer surface of the limiting rings 33 is in contact with the groove wall of the mounting groove 11.

[0048] This application uses the through hole 32 to avoid the rotating structure 2, ensuring that the sprocket can be fitted onto the rotating structure 2; and uses the limiting ring 33 to limit the sprocket body 31, ensuring the contact area between the sprocket body 31 and the rolling element 22, and increasing the bearing capacity of the sprocket body 31.

[0049] Referring to Figures 1-5, in this application, the height of the rolling element 22 is greater than the width of the guide groove 12. Compared with the existing limitation that the height of the rolling element is not greater than the width of the guide groove 12, under the same conditions, the load-bearing capacity of this application is greater than that of the prior art. In the prior art, to ensure the safety of saw chain use, specifically, when the saw chain is running, it may lose stability due to excessive gap between the roller needle and the groove wall, leading to saw chain derailment or jamming. This not only damages the saw chain and guide plate but may also pose a safety hazard to the operator. However, in this application, the setting that the height of the rolling element 22 is greater than the width of the guide groove 12, through the setting of the limiting ring 33, increases the thickness at the opening of the through hole 32, which fits the surface of the rolling element 22. Furthermore, the sum of the thickness of the sprocket body 31 and the thickness of the two limiting rings 33 is not less than the height of the rolling element 22. Therefore, the gap between the roller needle and the groove wall can be ensured, ensuring the stability of the roller needle during rotation, avoiding saw chain derailment or jamming, and thus ensuring the safety of the operator. It should be noted that in this embodiment, the height of the rolling element 22 is not greater than 2.5 times the width of the guide groove 12, thereby ensuring the strength of the support plate 1.

[0050] Referring to Figure 2, in this application, the sprocket body 31 is a toothed sprocket; the lubrication structure 4 includes a lubrication cavity 41 formed between the inner wall of the sprocket 3 and the reference circular block 21.

[0051] This invention utilizes the lubrication chamber 41 to temporarily store lubricating oil, which can be a high-temperature resistant solid lubricating oil such as high-temperature lithium-based grease. This ensures that the rolling element 22 is in full contact with the lubricating oil, ensuring smooth rotation of the rolling element 22, reducing friction during rotation, reducing wear of the rolling element 22, and thus extending the service life of the rolling element 22.

[0052] It should be noted that in this application, the two ends of the lubrication cavity 41 can be limited and sealed by the support plate 1, and one of the support plates 1 is provided with an oil injection hole 15, which is connected to the lubrication cavity 41. The operator can replenish the lubrication through the oil injection hole 15, and when the oil injection hole 15 does not need to be injected, it can be sealed by a rubber block.

[0053] Referring to Figures 1-6, the working principle of this application is as follows:

[0054] The saw chain guide head of this application can be installed on the saw chain guide head by riveting. During operation, the saw chain belt rotates, which drives the sprocket 3 to rotate. When the sprocket 3 rotates, the limiting ring 33 and the sprocket body 31 will roll and rub against the rolling element 22. The lubricating oil will lubricate the rolling element 22, reduce the wear of the rolling element 22, and extend the service life of the rolling element 22.

[0055] Example 2

[0056] Referring to Figures 7 and 8, the difference between this embodiment and Embodiment 1 is that the sprocket 3 in this embodiment is a grooved sprocket. This application reduces the processing difficulty by setting the sprocket as a grooved sprocket. Of course, partitions can also be set at equal angles inside the grooved sprocket to improve the transmission efficiency of the grooved sprocket. In addition, since the grooved sprocket with partitions does not rotate by friction, the noise during use will be lower.

[0057] Example 3

[0058] Referring to Figure 9, the difference between this embodiment and the above embodiment is that, in this embodiment, the rotating structure 2 includes a reference circular block 21 mounted on the support plate 1 and located in the mounting groove 11, a rolling element 22 surrounding the outer wall of the reference circular block 21, a concentric outer ring 23 in contact with the rolling element 22 and concentrically arranged with the reference circular block 21, and the outer wall of the concentric outer ring 23 in contact with the sprocket 3.

[0059] In this embodiment, by adding a concentric outer ring 23, the rolling element 22 is directly limited, and the length of the rolling element 22 is separated from the thickness of the sprocket 3. This links the height of the rolling element 22 with the height of the concentric outer ring 23, so that even if the thickness of the sprocket 3 is less than the height of the rolling element 22, there will be no excessive gap, thus making the sprocket more flexible. It should be noted that the height of the concentric outer ring 23 is not less than the height of the rolling element 22.

[0060] Example 4

[0061] Referring to Figures 10 and 11, the difference between this embodiment and the above embodiment is that, in this embodiment, the sprocket 3 includes a sprocket body 31, a through hole 32 corresponding to the rotating structure 2 at the center of the sprocket body 31, and grooves 34 on both sides of the sprocket body 31; a sprocket retaining ring 24 corresponding to the groove 34 of the sprocket body 31 is installed on the outer ring wall of the concentric outer ring 23; it should be noted that the sprocket retaining ring 24 in this application can be fixedly installed on the outer wall of the concentric outer ring 23 by welding.

[0062] In this embodiment, the sprocket retaining ring 24 can limit the sprocket body 31, prevent the sprocket body 31 from shaking, and increase the friction between the sprocket body 31 and the rotating structure 2 when rotating, ensuring that the sprocket 3 rotates between the concentric outer ring 23 and the rolling element 22, rather than between the sprocket 3 and the concentric outer ring 23.

[0063] Example 5

[0064] Referring to Figure 12, the difference between this embodiment and the above embodiment is that, in this embodiment, the lubrication structure 4 further includes a limiting ring 42 disposed on the reference circular block 21.

[0065] In this embodiment, the limiting ring 42 can further limit both ends of the rolling element 22, ensuring that even if the gap of the rolling element 22 is too large, the rolling element 22 will not shake violently and lose stability, ensuring that the rolling element 22 can only roll, ensuring the safety of the saw chain guide head, and can also seal the lubricating oil. It should be noted that the limiting ring 42 is provided with an oil passage hole 43.

[0066] Example 6

[0067] Referring to Figure 13, the difference between this embodiment and the above embodiment is that, in this embodiment, the limiting ring 42 is provided with a plurality of heat dissipation holes 211 at equal angles. The heat dissipation holes 211 can play a heat dissipation role, reduce the temperature of the rolling element 22, and extend the service life of the rolling element 22.

[0068] The above embodiments are illustrative of this application and are not intended to limit this application. Any simple modifications to this application are within the protection scope of this application.

Claims

1. A saw chain guide head, wherein the saw chain guide head is disposed at the end of a saw chain guide, characterized in that, It includes a support plate (1), a rotating structure (2), a sprocket (3), and a lubrication structure (4); The number of the support plates (1) is two, and the support plates (1) are provided with mounting grooves (11), and a guide groove (12) is formed between the two support plates (1); The rotating structure (2) is mounted on the support plate (1) and located in the mounting groove (11); The sprocket (3) is mounted on the rotating structure (2) and connected to the rotating components of the rotating structure (2); The rotating structure (2) and the sprocket (3) are equipped with a lubrication structure (4).

2. The saw chain guide head according to claim 1, characterized in that, The support plate (1) includes a connecting part (13) for connecting with the saw chain guide plate, and an mounting part (14) integrally formed with the connecting part (13), and the mounting groove (11) is provided on the mounting part (14); The distance between the bottoms of the mounting grooves (11) on the two support plates (1) is less than or equal to twice the width of the guide groove (12).

3. The saw chain guide head according to claim 1, characterized in that, The mounting groove (11) is a circular groove, and the depth of the mounting groove (11) is less than the thickness of the support plate (1).

4. The saw chain guide head according to claim 1, characterized in that, The rotating structure (2) includes a reference circular block (21) mounted on a support plate (1) and located in a mounting groove (11), and a rolling element (22) surrounding the outer wall of the reference circular block (21), which is in contact with the sprocket (3).

5. The saw chain guide head according to claim 1, characterized in that, The rotating structure (2) includes a reference circular block (21) mounted on a support plate (1) and located in a mounting groove (11), a rolling element (22) surrounding the outer wall of the reference circular block (21), a concentric outer ring (23) in contact with the rolling element (22) and concentrically arranged with the reference circular block (21), and the outer wall of the concentric outer ring (23) in contact with the sprocket (3).

6. The saw chain guide head according to claim 4, characterized in that, The sprocket (3) includes a sprocket body (31), a through hole (32) corresponding to the rotating structure (2) at the center of the sprocket body (31), and limiting rings (33) on both sides of the sprocket body (31). The limiting rings (33) are located at the opening of the through hole (32), and the outer surface of the limiting rings (33) is in contact with the groove wall of the mounting groove (11).

7. The saw chain guide head according to claim 5, characterized in that, The sprocket (3) includes a sprocket body (31), a through hole (32) corresponding to the rotating structure (2) at the center of the sprocket body (31), and grooves (34) on both sides of the sprocket body (31); The outer ring wall of the concentric outer ring (23) is equipped with a sprocket retaining ring (24) corresponding to the groove (34) of the sprocket body (31).

8. The saw chain guide head according to claim 4 or 5, characterized in that, The height of the rolling element (22) is greater than the width of the guide groove (12).

9. The saw chain guide head according to claim 4 or 5, characterized in that, The sprocket body (31) can be a toothed sprocket or a grooved sprocket, and the lubrication structure (4) is set on the reference block (21), or the reference block (21) and the sprocket (3); The lubrication structure (4) includes a lubrication cavity (41) formed between the inner wall of the sprocket (3) and the reference circular block (21).

10. The saw chain guide head according to claim 9, characterized in that, The lubrication structure (4) also includes a limiting ring (42) disposed on the reference circular block (21).

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