Bearing grease injection head with flow guide grease injection channel

By designing a bearing grease injection head with a grease-guiding channel, and utilizing the combination of an adjusting disc and a guide groove, flexible control and precise execution of the grease injection process are achieved. This solves the problem of difficult grease volume control in existing technologies, improves grease injection efficiency and quality, ensures uniform lubrication of the bearing, and extends the service life of the equipment.

CN223924493UActive Publication Date: 2026-02-17CHANGZHOU SBEJIA NEEDLE ROLLING BEARING CO LTD
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Patent Information

Application Number
CN202520923918.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-12
Publication Date
2026-02-17
Estimated Expiration
2035-05-12

AI Technical Summary

Technical Problem

In the existing technology, it is difficult to achieve precise control of the amount of grease injected into the bearing grease injection head, resulting in too much or too little grease injection, which affects the efficiency and quality of grease injection, especially in large or multi-roller bearings, resulting in uneven lubrication.

Method used

A bearing grease injection device with a grease-guiding channel was designed, including a base. Multiple grease injection protrusions are fixedly connected to the bottom of the base, and each protrusion has multiple guiding grooves inside. A fixed column is fixedly connected to the top of each protrusion, and an adjusting disc is rotatably connected to the outer wall of the fixed column. The top of the adjusting disc has multiple coarse and fine grease injection holes, and fan-shaped grooves are formed on both the left and right sides of the top of the adjusting disc. A grease tank is fixedly connected to the top of the adjusting disc, and a feeding mechanism is provided on the left side of the grease tank. The feeding mechanism includes an oil delivery pipe, a grease tank, a motor, a spiral stirring shaft, and a heating pipe.

Benefits of technology

By adjusting the disc to switch grease injection modes, using the limit block for positioning, and guiding the grease through the guide groove to deliver it along a predetermined path, flexible control and precise execution of the grease injection process are achieved, improving grease injection efficiency and quality, ensuring uniform lubrication of the bearings, and extending the service life of the equipment.

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Abstract

The utility model relates to the technical field of bearing grease injection, and discloses a bearing grease injection head with a flow guide grease injection channel, which comprises a base, the bottom of the base is fixedly connected with a plurality of grease injection raised heads, a plurality of flow guide grooves are arranged in the plurality of grease injection raised heads, the tops of the grease injection raised heads are fixedly connected with fixing columns, and the fixing columns are fixedly connected with the flow guide grooves. An adjusting disc is rotationally connected to the outer wall of the fixing column, a plurality of thick grease injection holes are formed in the top of the adjusting disc, a plurality of thin grease injection holes are formed in the top of the adjusting disc, limiting blocks are fixedly connected to the left end and the right end of the outer side of the fixing column, and fan-shaped grooves are formed in the left side and the right side of the top of the adjusting disc. According to the grease injection device, the grease injection modes are switched by rotating the adjusting disc, the limiting block assists in positioning, the grease injection raised head injects grease into the bearing, and the flow guide groove guides the grease to be conveyed according to a preset path, so that flexible control over the grease injection process is achieved, different grease injection requirements are met, and the grease injection efficiency and quality are improved.
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Description

Technical Field

[0001] This utility model relates to the field of bearing grease injection technology, and in particular to a bearing grease injection head with a grease guiding channel. Background Technology

[0002] In modern industry, bearings are an indispensable basic component in mechanical equipment and are mainly used in many industries such as automobile manufacturing, machining and aerospace. Their performance directly affects the operating efficiency and reliability of the equipment. Good lubrication is a key factor in ensuring the normal operation of bearings and extending their service life. Therefore, bearing grease injection heads have emerged.

[0003] A bearing grease injector with a flow channel is a device specifically designed to precisely inject grease into the bearing. Through its unique internal flow channel, it efficiently delivers grease to all friction points of the bearing, effectively reducing bearing wear and minimizing equipment downtime. Compared to traditional grease injection methods, it significantly improves lubrication efficiency and quality, making it an important technical means to ensure reliable bearing operation.

[0004] For large bearings or multi-roller bearings, the grease injection head cannot guarantee that each roller and raceway will receive uniform lubrication. Existing technology uses a grease injection head with a flow divider to generate appropriate flow and disturbance of grease during injection, thereby distributing it more evenly inside the bearing. However, the amount of grease injected varies for different bearing sizes, and it is difficult for the grease injection head to precisely control the amount of grease injected. This can result in too much or too little grease being injected during the grease injection process, affecting the efficiency and quality of grease injection. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a bearing grease injection head with a grease-guiding channel, which aims to improve the problem that excessive or insufficient grease injection will affect the grease injection efficiency and quality in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a bearing grease injection head with a grease-guiding channel, comprising a base, a plurality of grease injection protrusions fixedly connected to the bottom of the base, a plurality of guiding grooves being formed inside the plurality of grease injection protrusions, a fixed post fixedly connected to the top of the grease injection protrusions, an adjusting disc rotatably connected to the outer wall of the fixed post, a plurality of coarse grease injection holes and a plurality of fine grease injection holes being formed on the top of the adjusting disc, limit blocks fixedly connected to the left and right ends of the outer side of the fixed post, fan-shaped grooves being formed on the left and right sides of the top of the adjusting disc, a grease groove fixedly connected to the top of the adjusting disc, and a feeding mechanism provided on the left side of the grease groove, the feeding mechanism being used to provide grease to the grease injection head.

[0007] As a further description of the above technical solution:

[0008] The feeding mechanism includes an oil supply pipe, the right end of which is connected to the left end of the grease tank, and the left end of which is connected to a grease container. A motor is fixedly connected to the top of the grease container, and a spiral stirring shaft is fixedly connected to the output end of the motor. A heating tube is fixedly connected inside the grease container, and a sealing cover is slidably connected to the top left side of the grease container.

[0009] As a further description of the above technical solution:

[0010] The bottom of the base is fixedly connected to a limiting end face, and multiple rubber blocks are fixedly connected to the bottom of the base.

[0011] As a further description of the above technical solution:

[0012] A mounting plate is fixedly connected to the top of the outer side of the grease tank, and multiple mounting holes are fixedly connected to the top of the mounting plate.

[0013] As a further description of the above technical solution:

[0014] A sealing groove is provided on the top of the base, and a sealing ring is slidably connected inside the sealing groove.

[0015] As a further description of the above technical solution:

[0016] The bottom of the grease tank is fixedly connected to a fixing plate, and support legs are fixedly connected to the four corners of the bottom of the fixing plate.

[0017] As a further description of the above technical solution:

[0018] The front side of the grease tank is provided with an installation groove, and an observation window is fixedly connected inside the installation groove.

[0019] As a further description of the above technical solution:

[0020] A handle is fixedly connected to the top of the sealing cap, and the outer wall of the handle is designed to be non-slip.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the grease injection mode is switched by rotating the adjustment disc, and the limiting block assists in positioning. The grease injection protrusion is inserted into the bearing to form a grease injection channel. The guide groove guides the grease to be delivered along a predetermined path. According to the needs, the coarse grease injection hole can be selected for fast grease injection or the fine grease injection hole for precise grease injection. This realizes flexible control and precise execution of the grease injection process, improves grease injection efficiency and quality, meets different grease injection needs, and effectively improves the bearing lubrication effect.

[0023] 2. In this utility model, grease is stored in a grease tank, a sealed cover prevents grease contamination, a motor drives a spiral stirring shaft to stir the grease evenly, a heating tube reduces the viscosity of the grease as needed, and finally the grease is stably delivered to the grease tank through an oil delivery pipe, ensuring sufficient grease supply and smooth delivery in different environments, ensuring good lubrication of the bearings and extending the service life of the equipment. Attached Figure Description

[0024] Figure 1 This is a front view of a bearing grease injection head with a grease channel for guiding flow, as proposed in this utility model.

[0025] Figure 2 This is a perspective view of a bearing grease injection head with a grease channel for guiding grease injection proposed in this utility model;

[0026] Figure 3 This is an exploded view of the sealing ring of a bearing grease injection head with a grease channel according to the present invention.

[0027] Figure 4 This is a cross-sectional view of a bearing grease injection head with a grease channel for guiding flow, as proposed in this utility model.

[0028] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0029] Legend:

[0030] 1. Base; 2. Feeding mechanism; 201. Oil pipe; 202. Grease tank; 203. Motor; 204. Spiral stirring shaft; 205. Heating tube; 206. Sealing cap; 3. Grease injection protrusion; 4. Guide groove; 5. Fixing column; 6. Adjusting disc; 7. Coarse grease injection hole; 8. Fine grease injection hole; 9. Limiting block; 10. Fan-shaped groove; 11. Grease tank; 12. Limiting end face; 13. Rubber block; 14. Mounting plate; 15. Mounting hole; 16. Sealing groove; 17. Sealing ring; 18. Fixing plate; 19. Support leg; 20. Mounting groove; 21. Observation window; 22. Handle. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 3 , Figure 4 and Figure 5This utility model provides an embodiment of a bearing grease injection head with a grease-guiding channel, comprising a base 1, which provides a mounting and support foundation for the entire grease injection head, ensuring its stable installation in the working position. Multiple grease injection protrusions 3 are fixedly connected to the bottom of the base 1. These protrusions 3 extend into the bearing to perform grease injection, allowing precise delivery of grease to the parts of the bearing requiring lubrication. Multiple guide grooves 4 are formed inside the protrusions 3, guiding grease from the inside of the grease injection head to the bearing. A fixing post 5 is fixedly connected to the top of each protrusion 3, providing rotational support for an adjusting disc 6 and ensuring the stability of the adjusting disc 6 during rotation. The adjusting disc 6 is rotatably connected to the outer wall of the fixing post 5, allowing the adjusting disc 6 to switch between different grease injection modes to meet different grease injection needs. The top of the adjusting disc 6 has... Multiple coarse grease injection holes 7 are used when a large amount of grease needs to be injected quickly, which can improve the grease injection efficiency. Multiple fine grease injection holes 8 are opened on the top of the adjusting disc 6. The fine grease injection holes 8 are used when precise control of the grease injection volume or fine grease injection is required, which can achieve precise grease injection. Limiting blocks 9 are fixedly connected to the left and right ends of the outer side of the fixed column 5. The limiting blocks 9 are used to limit the rotation range of the adjusting disc 6 to prevent the adjusting disc 6 from rotating excessively and affecting the grease injection operation. Fan-shaped grooves 10 are opened on the left and right sides of the top of the adjusting disc 6. The fan-shaped grooves 10 make it easy for the operator to manually rotate the adjusting disc 6, which improves the convenience of operation. A grease tank 11 is fixedly connected to the top of the adjusting disc 6. The grease tank 11 is used to temporarily store grease, making the grease injection process more continuous and stable. A feeding mechanism 2 is set on the left side of the grease tank 11. The feeding mechanism 2 is used to provide grease to the grease injection head to ensure the continuous grease injection operation.

[0033] Specifically, the base 1 provides the mounting and support foundation for the entire grease injection head, ensuring its stable installation in the working position. This ensures the grease injection head remains stable during grease injection, preventing grease deviation due to shaking. The grease injection protrusion 3 extends into the bearing to perform grease injection, allowing the grease to be accurately delivered to the parts of the bearing that require lubrication, thereby effectively improving the bearing's lubrication effect and extending its service life. The guide groove 4 guides the grease from inside the grease injection head to the bearing, ensuring smooth delivery of the grease along a predetermined path and preventing turbulence or blockage within the grease injection head. The fixing column 5 provides rotational support for the adjusting disc 6, ensuring the stability of the adjusting disc 6 during rotation. This guarantees the reliability and accuracy of the adjusting disc 6 when switching grease injection modes. The adjusting disc 6 can switch between different grease injection modes by rotation to meet different grease injection needs. The system is designed to flexibly handle grease injection under various working conditions, improving the applicability of the grease injection head. The coarse grease injection hole 7 is used when a large amount of grease needs to be injected quickly, which can improve grease injection efficiency and help complete the grease injection of the bearing in a short time, thus improving work efficiency. The fine grease injection hole 8 is used when precise control of the grease injection volume or fine grease injection is required, which can achieve precise grease injection and ensure that the appropriate amount of grease can be accurately injected in situations where the grease injection volume requirement is high. The limit block 9 is used to ensure that the adjusting disc 6 rotates within a safe angle range and maintains the normal operation of the grease injection work. The fan-shaped groove 10 makes it easy for the operator to manually rotate the adjusting disc 6, improving the convenience of operation and allowing the operator to quickly adjust the grease injection mode according to actual needs. The grease groove 11 is used to temporarily store grease, making the grease injection process more continuous and stable, avoiding grease injection interruption due to untimely grease supply, and ensuring the continuity of the grease injection work.

[0034] Reference Figure 1 , Figure 2 and Figure 4The feeding mechanism 2 includes an oil delivery pipe 201, which is used to transport grease from the grease tank 202 to the grease reservoir 11, ensuring a stable grease transmission path. The right end of the oil delivery pipe 201 is connected to the left end of the grease reservoir 11, allowing the grease to flow smoothly into the grease reservoir 11 and providing grease reserves for the grease injection operation. The left end of the oil delivery pipe 201 is connected to the grease tank 202, which is used to store a large amount of grease to ensure a sufficient grease supply during the grease injection operation. A motor 203 is fixedly connected to the top of the grease tank 202, which provides rotational power to the spiral stirring shaft 204, ensuring that the grease is properly stirred. The oil in the tank 202 can be thoroughly stirred. The output end of the motor 203 is fixedly connected to a spiral stirring shaft 204. Driven by the motor 203, the spiral stirring shaft 204 stirs the oil in the oil tank 202, making the oil evenly mixed and avoiding sedimentation and stratification. A heating tube 205 is fixedly connected inside the oil tank 202. The heating tube 205 can heat the oil in the oil tank 202, reduce the viscosity of the oil, and facilitate the delivery and injection of the oil. A sealing cover 206 is slidably connected to the top left side of the oil tank 202. The sealing cover 206 is used to seal the oil tank 202 to prevent the oil from being contaminated by the outside.

[0035] Specifically, the oil delivery pipe 201 is used to transport grease from the grease tank 202 to the grease reservoir 11, ensuring a stable grease transmission path and thus enabling a continuous and stable supply of grease to the grease injection work area, ensuring smooth grease injection. The grease tank 202 is used to store a large amount of grease, ensuring sufficient grease supply during the grease injection process, avoiding interruptions due to insufficient grease, and improving work efficiency. The motor 203 provides rotational power to the spiral stirring shaft 204, ensuring that the grease is fully stirred in the grease tank 202, making the grease properties uniform, improving grease quality, and thus improving the bearing lubrication effect. Driven by the motor 203, the stirring shaft 204 stirs the grease in the grease tank 202, ensuring uniform mixing and preventing sedimentation and stratification. This prevents impurities or uneven grease from affecting the grease injection quality and bearing performance. The heating tube 205 heats the grease in the grease tank 202, reducing its viscosity and facilitating its transport and injection. Especially in low-temperature environments, this ensures smooth grease flow and improves injection efficiency. The sealing cap 206 seals the grease tank 202, preventing external contamination, maintaining grease cleanliness and performance stability, extending grease lifespan, and ensuring effective grease injection.

[0036] Reference Figure 2 , Figure 3 and Figure 4The bottom of the base 1 is fixedly connected to a limiting end face 12, which is used to limit the corresponding part of the bearing during grease injection to ensure accurate matching between the grease injection head and the bearing. Multiple rubber blocks 13 are fixedly connected to the bottom of the base 1. The rubber blocks 13 can buffer the grease injection head when it contacts the bearing, reducing the impact force generated during grease injection. The top of the outer side of the grease groove 11 is fixedly connected to a mounting plate 14, which provides an installation interface for the grease injection head, making it convenient to install the grease injection head on other equipment or structures. Multiple mounting holes 15 are fixedly connected to the top of the mounting plate 14, which facilitates the fixed connection of the mounting plate 14 to other components through bolts, making the installation of the grease injection head more secure and reliable. A sealing groove 16 is opened on the top of the base 1. The sealing groove 16 is used to accommodate the sealing ring 17 and provide installation space for the sealing ring 17. The sealing ring 17 is slidably connected inside the sealing groove 16. The sealing ring 17 can enhance the sealing performance when the base 1 is connected to the adjusting disc 6 to prevent grease leakage.

[0037] Specifically, the limiting end face 12 is used to cooperate with the corresponding part of the bearing during grease injection to ensure that the grease injection head 3 can accurately inject grease into the designated position of the bearing, improving the accuracy of grease injection. The rubber block 13 can act as a buffer when the grease injection head contacts the bearing, reducing the impact force generated during grease injection and effectively protecting the grease injection head and the bearing, avoiding structural damage caused by collision. The mounting plate 14 is used to provide an installation interface for the grease injection head, making it convenient to install the grease injection head on other equipment or structures, so that the grease injection head can flexibly adapt to different working scenarios and equipment requirements. Mounting hole 15 facilitates the fixed connection of mounting plate 14 with other components via bolts, making the installation of grease head more secure and reliable, preventing the grease head from loosening or shifting during operation and affecting the grease injection operation. Sealing groove 16 is used to accommodate sealing ring 17, providing installation space for sealing ring 17, ensuring that sealing ring 17 can be correctly installed and perform its sealing function. Sealing ring 17 can enhance the sealing performance when the base 1 is connected to the adjusting disc 6, prevent grease leakage, avoid grease leakage and waste, and at the same time prevent external impurities from entering the grease head and affecting the grease injection effect.

[0038] Reference Figure 2The bottom of the grease tank 202 is fixedly connected to a fixing plate 18, which provides a foundation for the installation and support of the grease tank 202, ensuring the stability of the grease tank 202. Support legs 19 are fixedly connected to the four corners of the bottom of the fixing plate 18, which support the grease tank 202 and improve its stability. The front side of the grease tank 202 is provided with an installation groove 20, which provides an installation position for the observation window 21, ensuring that the observation window 21 is firmly installed. The observation window 21 is fixedly connected inside the installation groove 20, which allows the operator to observe the grease storage and grease status inside the grease tank 202. The top of the sealing cover 206 is fixedly connected to a handle 22, which makes it easy for the operator to open and close the sealing cover 206, improving the convenience of operation. The outer wall of the handle 22 is designed with anti-slip properties, which increases the friction for the operator to hold and prevents the sealing cover 206 from falling off or becoming difficult to operate due to slippage during opening or closing.

[0039] Specifically, the fixing plate 18 provides an installation and support foundation for the grease tank 202, ensuring its stable installation and preventing shaking during grease storage and transportation, thus ensuring the stable operation of the grease supply device. The support leg 19 supports the grease tank 202, improving its stability and maintaining a suitable height from the ground for easy maintenance and repair, while also preventing uneven ground from affecting its stability. The mounting groove 20 provides an installation position for the observation window 21, ensuring its secure installation and preventing it from falling off during use. The system provides a continuous and reliable viewing angle for operators. The observation window 21 allows operators to observe the grease level and condition inside the grease tank 202, enabling them to promptly replenish grease or address any abnormal conditions. The handle 22 facilitates opening and closing the sealing cover 206, improving operational convenience, reducing operator workload, and making the operation of the sealing cover 206 easier and less strenuous. The outer wall of the handle 22 features an anti-slip design, increasing friction for the operator's grip, ensuring operational safety, and preventing grease leakage caused by improper operation of the sealing cover 206.

[0040] Working principle: When the grease injection head is working, the grease injection protrusion 3 is inserted into the bearing to provide a channel for grease injection. The grease groove 11 temporarily stores grease to ensure a continuous and stable grease injection process. The grease is guided by the guide groove 4 and flows smoothly to the bearing along a predetermined path. The operator manually rotates the adjusting disc 6 to switch between different grease injection modes. The limit block 9 ensures that the adjusting disc 6 rotates within a safe angle range. When a large amount of grease needs to be injected quickly, the coarse grease injection hole 7 is used to improve grease injection efficiency. When precise control of the grease injection volume or fine grease injection is required, the fine grease injection hole 8 is used to achieve precise grease injection. In this way, all components work together to achieve efficient and precise grease injection of the bearing.

[0041] Furthermore, when the grease injection device is working, the grease tank 202 first provides sufficient grease reserves for the grease injection operation to avoid grease injection interruption. The sealing cover 206 seals the grease tank 202 to prevent external impurities from contaminating the grease. After the motor 203 starts, it provides rotational power to the spiral stirring shaft 204. The spiral stirring shaft 204 stirs the grease in the grease tank 202 to make it evenly mixed, avoid sedimentation and stratification, and ensure the quality of grease injection. When the ambient temperature is low or the grease viscosity is high, the heating pipe 205 heats the grease in the grease tank 202 to reduce the viscosity and ensure smooth grease flow. Subsequently, the oil delivery pipe 201 transports the grease from the grease tank 202 to the grease tank 11, establishing a stable grease transmission path to ensure a continuous supply of grease to the grease injection operation site, so that the entire grease injection operation can proceed smoothly.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bearing lubricant injection head with a flow guiding injection channel, comprising a base (1), characterized in that: The bottom of the base (1) is fixedly connected with a plurality of grease injection protrusions (3), a plurality of flow guide grooves (4) are arranged in the plurality of grease injection protrusions (3), the top of the grease injection protrusion (3) is fixedly connected with a fixed column (5), the outer wall of the fixed column (5) is rotatably connected with an adjusting disc (6), a plurality of coarse grease injection holes (7) are arranged in the top of the adjusting disc (6), a plurality of fine grease injection holes (8) are arranged in the top of the adjusting disc (6), the outer side left and right ends of the fixed column (5) are fixedly connected with a limiting block (9), the top left and right sides of the adjusting disc (6) are provided with a fan-shaped groove (10), the top of the adjusting disc (6) is fixedly connected with a grease groove (11), and the left side of the grease groove (11) is provided with a feeding mechanism (2).

2. The bearing lubricant injection head with a flow guide and lubricant injection channel of claim 1, wherein: The feeding mechanism (2) comprises an oil conveying pipe (201), the right end of the oil conveying pipe (201) is communicated with the left end of the grease groove (11), the left end of the oil conveying pipe (201) is communicated with a grease tank (202), the top of the grease tank (202) is fixedly connected with a motor (203), the output end of the motor (203) is fixedly connected with a spiral stirring shaft (204), the inside of the grease tank (202) is fixedly connected with a heating pipe (205), and the top left side of the grease tank (202) is slidably connected with a sealing cover (206).

3. The bearing lubricant injection head with a flow guide and lubricant injection channel of claim 1, wherein: The bottom of the base (1) is fixedly connected with a limiting end face (12), and the bottom of the base (1) is fixedly connected with a plurality of rubber blocks (13).

4. The bearing lubricant injection head with a flow guide and lubricant injection channel of claim 1, wherein: The top of the grease groove (11) is fixedly connected with a mounting disc (14), and the top of the mounting disc (14) is fixedly connected with a plurality of mounting holes (15).

5. The bearing lubricant injection head with a flow guide and lubricant injection channel of claim 1, wherein: The top of the base (1) is provided with a sealing groove (16), and the inside of the sealing groove (16) is slidably connected with a sealing ring (17).

6. The bearing lubricant injection head with a flow guide and lubricant injection channel of claim 2, wherein: The bottom of the grease tank (202) is fixedly connected with a fixed plate (18), and the bottom of the fixed plate (18) is fixedly connected with a supporting leg (19) at four corners.

7. The bearing lubricant injection head with a flow guide and lubricant injection channel of claim 2, wherein: The front side of the grease tank (202) is provided with a mounting groove (20), and the inside of the mounting groove (20) is fixedly connected with an observation window (21).

8. The bearing lubricant injection head with a flow guide and lubricant injection channel of claim 2, wherein: The top of the sealing cover (206) is fixedly connected with a handle (22), and the outer wall of the handle (22) is designed to be anti-skid.