A device for lubricating the inner end of a CG

Abstract

The utility model discloses a kind of CG inner end section grease injection device, including base, fixed on base weighing sensor, CG inner end section support seat of lower end being placed on the upper end of weighing sensor, support frame, pneumatic cylinder or electric push rod, grease pipe joint and grease injection head;Pneumatic cylinder or electric push rod is fixed on the upper end plate of support frame;Grease pipe joint upper end is fixed on the piston rod of pneumatic cylinder or electric push rod, its lower end is detachably sealed and fixed on the upper end of grease injection head;Grease injection head main part is the round tube with blind hole inner cavity;The upper end port of round tube is provided with the interface of sealing connection with the lower end of quick connector, and the position of the upper end of round tube is provided with end cap close to interface;More than 3 oil outlet holes that communicate with the lower end of the inner cavity of round tube are evenly opened on the lateral wall of the lower end of round tube.The utility model avoids the waste of grease, reduces the weight of CG inner end section, and grease no longer flows into the central hole of shaft rod, the air pressure of the inner cavity of both ends of shaft rod keeps balance and grease no longer pollutes outer end section through hole thread.

Description

Technical Field

[0001] This utility model belongs to the field of CG section assembly shaft technology, and relates to a grease injection device for CG inner end section. Background Technology

[0002] CG section axles are an important type of automotive drive axle, widely used in rear-wheel drive and four-wheel drive vehicles. During the production of these axles, grease needs to be injected into the CG section. The existing grease injection device for the inner end section of the CG uses a common grease injector. This injector directly injects grease through the inner hole of the inner ring of the CG into the weight-reducing pit at the bottom of the inner cavity of the outer ring of the CG. After filling the weight-reducing pit, the grease gradually flows upwards into the gaps between the inner ring, outer ring, cage, and steel balls, and into the grooves of the outer ring of the CG. The grease entering the weight-reducing pit does not provide lubrication, increasing the weight of the inner end section of the CG, failing to meet the requirements of automotive lightweighting, wasting grease, and increasing the manufacturing cost of the inner end section. Furthermore, when assembling the inner end section of the CG onto the shaft, the grease in the weight-reducing pit easily flows into the center hole of the shaft under gravity. This grease can easily clog the center hole, causing an imbalance of air pressure in the inner cavities of the two end sections, severely affecting the quality of the automotive drive shaft. Additionally, the grease flows through the center hole of the shaft into the other outer end section, and into the threaded through-hole of the outer end section, causing the screws to easily strip during tightening by the customer, seriously affecting the assembly quality of the automotive drive shaft. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems in the prior art and provide a grease injection device for the inner end section of a CG shaft. This grease injection device not only avoids grease waste and reduces the weight of the inner end section of the CG shaft, meeting the requirements of automotive lightweighting, but also prevents grease from flowing into the center hole of the shaft, maintains the air pressure balance in the inner cavity of the two ends of the shaft, and prevents grease from contaminating the threads of the through hole of the outer end section, thus improving the quality of the automotive drive shaft. It has a wide range of applications.

[0004] To achieve the above objectives, the solution of this utility model is: a CG inner end section grease injection device, comprising a base, a weighing sensor fixed on the base, a CG inner end section support seat placed above the weighing sensor, a support frame, a cylinder or electric push rod, a grease tube connector, and a grease injection head; the cylinder or electric push rod is fixed on the upper end plate of the support frame; the upper end of the grease tube connector is fixed on the piston rod of the cylinder or the piston rod of the electric push rod, and its lower end is detachably sealed and fixed to the upper end of the grease injection head via a quick-connect plug; the inner cavity of the grease tube connector, the quick-connect plug, and the grease injection head are all described in the original text. The quick-connect plug cavity and the grease injection head cavity are vertically connected, and the central axes of each cavity coincide. The CG inner end section is installed in the positioning seat at the upper end of the CG inner end section support, and its central axis coincides with the central axis of the grease injection head cavity. A grease hose interface is provided on the side wall of the grease tube connector, which connects to the grease hose. The grease injection head body is a round tube with an inner cavity, the inner cavity of which is a blind hole, and the outer circle of the round tube matches the inner diameter of the inner ring of the CG inner end section. An interface that seals with the lower end of the quick-connect plug is provided at the upper end of the round tube, and an end cap is provided near the interface at the upper end of the round tube. During grease injection, the lower end of the end cap is snapped onto the outer edge of the upper end of the CG inner end section retainer, and the outer circle of the end cap is in close fit with the outer ring port of the CG inner end section. More than three oil outlet holes that communicate with the lower end of the inner cavity of the round tube are evenly opened on the side wall of the lower end of the round tube. The gap between the round tube below the oil outlet holes and the weight reduction pit of the outer ring of the CG is matched.

[0005] More preferably, the CG inner end section support base consists of a lower support plate, a middle liftable support rod, and an upper positioning seat; the support plate is placed above the weighing sensor; a height comparison ruler or a height proximity switch for the CG inner end section is installed on the vertical rod of the support frame. Thus, when changing to grease different types and heights of CG inner end sections, simply adjust the height of the liftable support rod so that the upper surface of the CG inner end section is at the same height as the height comparison ruler or the proximity switch is triggered. This allows for grease injection of CG inner end sections of various heights, providing a wide range of applications.

[0006] More preferably, a center-position magnetic switch is provided on the cylinder body 30-35mm below the center of the cylinder piston rod length. When the cylinder piston rod extends to the magnetic ring on the piston rod and senses the center-position magnetic switch, the grease injection head does not contact the tallest CG inner end section. The grease injection head can then make hard contact with the shortest CG inner end section for grease injection after the cylinder piston rod continues to extend for 2-3 seconds. This structural design allows for grease injection into both the shortest and tallest CG inner end sections. When the cylinder piston rod extends to the point where the grease injection head makes hard contact with the tallest CG inner end section, the CG inner end section rigidly prevents cylinder operation. Since the hardness of the CG inner end section is much greater than the cylinder pressure, the cylinder pressure will not damage the CG inner end section. This design allows for grease injection into CG inner end sections of various heights, making it suitable for a wide range of applications.

[0007] More preferably, the number of oil outlet holes of the grease injection head is the same as the number of steel balls in the inner end section of the CG.

[0008] More preferably, the outer end of the weighing sensor is covered with a protective cover.

[0009] The beneficial effects of this invention are as follows: Grease flows into the blind hole of the grease injection head, then flows out from the oil outlet holes on the side wall and is pressed upwards into the gaps between the inner ring, outer ring, cage, and steel ball of the CG inner end section, as well as into the groove of the CG outer ring, thus lubricating the grooves and effectively preventing friction between the steel ball and the grooves. The round tube below the oil outlet of the grease injection head blocks the weight reduction pit of the CG outer ring, preventing grease from being injected into the weight reduction pit. This not only reduces the amount of grease used and avoids waste, but also reduces the weight of the CG inner end section, meeting the requirements of automotive lightweighting. Furthermore, grease no longer flows into the center hole of the shaft, preventing pressure imbalance between the two ends of the shaft and grease contamination of the threads of the through hole of the outer end CG section, thus improving the quality of the automotive drive shaft. In addition, the end cap of the grease injection head covers the product cage, preventing grease from escaping from the upper side of the inner ring during grease injection, which would not only waste grease but also make it difficult for grease to enter the grooves. The weighing sensor not only detects the weight of the CG inner end section before grease injection, preventing insufficient filling of parts such as steel balls and preventing defective products from flowing out, but also detects the weight of the CG inner end section and the weight of the injected grease after grease injection. The weighing value is compared with the grease volume set in the program; an alarm is triggered if the value exceeds the set value, effectively preventing grease leakage and under-injection, and preventing the production of defective products. The quick-connect plug allows for rapid replacement of the grease injection head, adapting to the injection of grease for various models of CG inner end sections, making it widely applicable.

[0010] In summary, this invention not only avoids grease waste and reduces the weight of the CG inner end section, meeting the requirements of automotive lightweighting, but also prevents grease from flowing into the center hole of the shaft, maintains air pressure balance in the inner cavities of both ends of the shaft, and prevents grease from contaminating the threads of the outer end section through hole, thus improving the quality of the automotive drive shaft. It has a wide range of applications. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is the front view of the present invention;

[0013] Figure 3 for Figure 2 AA section view;

[0014] Figure 4 This describes the mating structure between the grease injection head of this invention and the inner end section of the CG during grease injection. Detailed Implementation

[0015] The present invention will be further described below with reference to specific embodiments.

[0016] like Figures 1 to 4As shown, this embodiment includes a base 1, a load cell 3 fixed on the base 1, a CG inner end section support 4 with its lower end positioned above the load cell 3, a support frame 8, a cylinder 14, a grease fitting 15, and a grease injection head 7. The load cell 3 in this embodiment has a protective cover 2 on its outer end, and a base support is also provided on the base 1. Because the piston rod of the cylinder 14 extends the same length each time, the CG inner end section support 4 in this embodiment consists of a lower support plate 15, a middle adjustable support rod 16, and an upper positioning seat 5; the support plate 15 is positioned above the load cell 3; a height comparison ruler or a height proximity switch for the CG inner end section 6 is installed on the vertical rod of the support frame 8. Thus, when different types and heights of CG inner end sections 6 are used for grease injection, simply adjust the height of the adjustable support rod 16 so that the upper surface of the CG inner end section 6 is the same height as the height comparison ruler or the proximity switch is triggered. This method can accommodate CG inner end sections of various heights for grease injection, offering a wide range of applications. The height-adjustable support rod 16 consists of an outer sleeve and an inner column, each with corresponding threaded holes. After the height is adjusted, they are fixed together by fastening screws. The CG inner end section support seat 4 can also consist of a lower support plate 15, a fixed-length support rod, and an upper positioning seat 5. A center-position magnetic switch is installed on the cylinder body 30-35mm below the center of the cylinder piston rod length. When the cylinder piston rod extends to the magnetic ring on the piston rod and senses the center-position magnetic switch, the grease injection head 7 does not contact the highest CG inner end section 6. When the cylinder piston rod continues to extend for 2-3 seconds, the grease injection head 7 can make hard contact with the lowest CG inner end section 6 for grease injection. This structural design allows for grease injection into both the lowest and highest CG inner end sections. When the cylinder piston rod extends to make hard contact with the highest CG inner end section, the CG inner end section rigidly prevents the cylinder 14 from operating. Since the hardness of the CG inner end section 6 is much greater than the pressure of the cylinder 14, the cylinder pressure does not damage the CG inner end section. This design allows for grease injection into CG inner end sections of various heights, making it widely applicable. The cylinder 14 is fixed to the upper end plate 13 of the support frame 8 via the support 12. The upper end of the grease fitting 15 is fixed to the piston rod of the cylinder 14 via the fixing block 11, and its lower end is detachably and sealed to the upper end of the grease fitting 7 via the quick-connect plug 9. The inner cavities of the grease fitting 15, the quick-connect plug 9, and the grease fitting 7 are vertically connected, and the central axes of each cavity coincide. The CG inner end section 6 is installed in the positioning seat 5 at the upper end of the CG inner end section support 4, and its central axis coincides with the central axis of the inner cavity of the grease injection head 7. A grease hose interface 10 is provided on the side wall of the grease hose connector 15, which connects to the grease hose. The main body of the grease injection head 7 is a circular tube with an inner cavity 74, which is a blind hole. The outer circle of the circular tube matches the inner diameter 64 of the inner ring of the CG inner end section 6. An interface 71 is provided at the upper end of the circular tube for sealing connection with the lower end of the quick plug 9, and an end cap 72 is provided at the upper end of the circular tube near the interface 71.During grease injection, the lower end of the end cap 72 is engaged with the upper outer edge of the CG inner end section retainer 61, with its outer circle fitting with a slight clearance at the port of the CG inner end section outer ring 63. Four (or six) oil outlet holes 73 are evenly distributed on the side wall of the lower end of the round tube, communicating with the lower end of the inner cavity of the round tube. The round tube below the oil outlet holes 73 is fitted with the clearance of the CG outer ring weight reduction pit. 62 is a steel ball. The number of oil outlet holes on the grease injection head 7 is preferably the same as the number of steel balls 62 on the CG inner end section.

[0017] The aforementioned cylinder 14 can also be equipped with an electric push rod, which can automatically adjust the length of the piston rod extension to accommodate grease injection into the CG inner end section of different heights. However, electric push rods are expensive, which would increase the overall cost of this equipment.

[0018] Grease flows into the blind hole cavity 74 of the grease injection head 7, then flows out from the oil outlet holes 73 on the side wall and is pressed upwards into the gaps between the inner ring 64, outer ring 63, retainer 61, and steel ball 62 of the CG inner end section 6, and into the groove of the CG outer ring 63, thus lubricating the grooves and effectively preventing friction between the steel ball 62 and the grooves. The round tube below the oil outlet hole 73 of the grease injection head 7 blocks the weight reduction pit of the CG outer ring, preventing grease from being injected into the weight reduction pit 65. This not only reduces the amount of grease used and avoids waste, but also reduces the weight of the CG inner end section, meeting the requirements of automotive lightweighting. Furthermore, grease no longer flows into the center hole of the shaft, preventing pressure imbalance at both ends of the shaft and grease contamination of the threads of the outer end CG section through hole, thus improving the quality of the automotive drive shaft. In addition, the end cap 72 of the grease injection head 7 covers the product retainer 61, preventing grease from escaping from the upper side of the inner ring 64 during grease injection, which would not only waste grease but also make it difficult for grease to enter the grooves. The weighing sensor 3 not only detects the weight of the CG inner end section before grease injection, preventing insufficient filling of parts such as steel balls and preventing defective products from flowing out, but also detects the weight of the CG inner end section and the weight of the injected grease after grease injection. The weighing value is compared with the grease volume set in the program; an alarm is triggered if the value exceeds the set value, effectively preventing grease leakage and under-injection, and preventing the occurrence of defective products. The quick-connect plug 9 allows for quick replacement of the grease injection head 7 to accommodate grease injection for various models of CG inner end sections, making it widely applicable.

[0019] The above-described embodiments are merely preferred and exemplary, and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A grease injection device for the inner end joint of a CG device, characterized in that: The device includes a base, a load cell fixed on the base, a CG inner end section support seat located above the load cell, a support frame, a cylinder or electric push rod, a grease fitting, and a grease injection head. The cylinder or electric push rod is fixed to the upper end plate of the support frame. The upper end of the grease fitting is fixed to the piston rod of the cylinder or the piston rod of the electric push rod, and its lower end is detachably and sealed to the upper end of the grease injection head via a quick-connect plug. The inner cavities of the grease fitting, the quick-connect plug, and the grease injection head are vertically connected, and the central axes of each cavity coincide. The CG inner end section is installed in a positioning seat at the upper end of the CG inner end section support seat, and its central axis coincides with the central axis of the grease injection head cavity. A grease hose interface is provided on the side wall of the grease fitting, which connects to a grease hose. The main body of the grease injection head is a circular tube with an inner cavity, the inner cavity of which is a blind hole, and the outer diameter of the circular tube matches the inner diameter of the inner ring of the CG inner end section. An interface is provided at the upper end of the circular tube for sealing connection with the lower end of the quick-connect plug. An end cap is provided at the upper end of the round tube near the interface; during grease injection, the lower end of the end cap is snapped onto the upper outer edge of the CG inner end section retainer, and the outer circle of the end cap is in close fit with the outer ring port of the CG inner end section with a small clearance; more than three oil outlet holes are evenly opened on the side wall of the lower end of the round tube, which are connected to the lower end of the inner cavity of the round tube; the gap between the round tube below the oil outlet holes and the weight reduction pit of the outer ring of the CG is matched.

2. The grease injection device for the inner end section of the CG according to claim 1, characterized in that: The CG inner end section support base consists of a support plate at the lower end, a liftable support rod in the middle, and a positioning seat at the upper end; the support plate is placed on the upper end of the weighing sensor; a height comparison ruler or height proximity switch of the CG inner end section is installed on the vertical rod of the support frame.

3. The grease injection device for the inner end section of a CG tube according to claim 1, characterized in that: A center-position magnetic switch is installed on the cylinder body 30-35mm below the center of the cylinder piston rod length. When the cylinder piston rod extends to the magnetic ring on the piston rod and senses the center-position magnetic switch, the grease injection head does not contact the inner end section of the highest CG. When the cylinder piston rod continues to extend for 2-3 seconds, the grease injection head can make hard contact with the inner end section of the lowest CG to inject grease.

4. The grease injection device for the inner end section of a CG tube according to claim 1, 2, or 3, characterized in that: The number of oil outlet holes of the grease injection head is preferably the same as the number of steel balls in the inner end section of the CG.

5. The grease injection device for the inner end section of the CG according to claim 4, characterized in that: The outer end of the weighing sensor is covered with a protective cover.

6. The CG inner end joint grease injection device according to claim 1, 2, or 3, characterized in that: The outer end of the weighing sensor is covered with a protective cover.

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