Grease injection device for CG inner end joint

Abstract

The invention discloses a CG inner end joint grease injection device which comprises a base, a weighing sensor fixed to the base, a CG inner end joint supporting seat with the lower end arranged at the upper end of the weighing sensor, a supporting frame, an air cylinder or an electric push rod, a grease pipe joint and a grease injection head. The cylinder or the electric push rod is fixed on the upper end plate of the support frame; the upper end of the grease pipe joint is fixed on a piston rod of the cylinder or the electric push rod, and the lower end is detachably sealed and fixed at the upper end of the grease injection head; the grease injection head main body is a circular tube with a blind hole inner cavity; an end cover is arranged at the position, close to the interface, of the upper end part of the circular tube; and more than three oil outlets communicated with the lower end of the inner cavity of the circular pipe are uniformly formed in the side wall of the lower end part of the circular pipe. Waste of grease is avoided, the weight of the CG inner end joint is reduced, the grease does not flow into the center hole of the shaft rod any more, air pressure of inner cavities of the two end joints of the shaft rod is kept balanced, and the grease does not pollute threads of the through hole of the outer end joint any more.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of CG joint assembly shaft assembly, and relates to a CG inner end joint lubricating device. BACKGROUND

[0002] The CG joint assembly shaft is an important type of automobile driving shaft, and is widely applied to rear-drive and four-wheel drive vehicles. In the production of the assembly shaft, the CG inner end joint needs to be lubricated. The existing CG inner end joint lubricating device has an ordinary oil nozzle as a lubricating head. The oil nozzle directly injects grease into the weight reduction pit at the bottom of the inner cavity of the CG outer ring through the inner hole of the CG inner ring. After the weight reduction pit is filled, the grease gradually enters the gap between the inner ring, the outer ring, the retainer and the steel ball and the groove of the CG outer ring upwards. The grease in the weight reduction pit cannot play a lubricating role, which not only increases the weight of the CG inner end joint, cannot meet the requirement of automobile lightening, but also wastes the grease and increases the manufacturing cost of the CG inner end joint. In addition, when the CG inner end joint is assembled on the shaft rod, the grease in the weight reduction pit is easily flowed into the center hole of the shaft rod under the action of gravity. The grease is easy to block the center hole, which leads to the imbalance of the air pressure in the inner cavities of the two end joints, seriously affects the quality of the automobile driving shaft, and the grease flows to the other outer end joint through the center hole of the shaft rod and flows into the threaded through hole of the outer end joint, which leads to the easy slipping of the screw during the assembly of the customer, and seriously affects the assembly quality of the automobile driving shaft. SUMMARY

[0003] The application aims to solve the above problems in the prior art, and provides a CG inner end joint lubricating device. The lubricating device not only avoids the waste of grease, reduces the weight of the CG inner end joint, meets the requirement of automobile lightening, and prevents the grease from flowing into the center hole of the shaft rod, balances the air pressure in the inner cavities of the two end joints of the shaft rod, and prevents the grease from polluting the threaded through hole of the outer end joint, improves the quality of the automobile driving shaft, and has a wide application range.

[0004] To achieve the above object, the solution of the present application 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 on the upper end of the weighing sensor, a support frame, a pneumatic cylinder or an electric push rod, a grease pipe joint and a grease injection head; the pneumatic cylinder or the electric push rod is fixed on the upper end plate of the support frame; the upper end of the grease pipe joint is fixed on the pneumatic cylinder piston rod or the electric push rod piston rod, and the lower end is detachably and sealingly fixed on the upper end of the grease injection head through a quick connector; the inner cavities of the grease pipe joint, the quick connector and the grease injection head vertically penetrate and the center axes of the inner cavities coincide; the CG inner end section is installed in the positioning seat on the upper end of the CG inner end section support seat, and the center axis coincides with the center axis of the inner cavity of the grease injection head; an oil hose interface is arranged on the side wall of the grease pipe joint, and the oil hose interface is connected with an oil hose; the main body of the grease injection head is a circular tube with an inner cavity, the inner cavity of the circular tube is a blind hole, the outer circle of the circular tube is matched with the inner diameter of the inner ring of the CG inner end section; an interface for sealing connection with the lower end of the quick connector is arranged on the upper end port of the circular tube, and an end cover is arranged on the position close to the interface on the upper end of the circular tube; the lower end of the end cover is clamped on the outer edge of the upper end of the CG inner end section holder, and the outer circle of the end cover is matched with the outer ring port of the CG inner end section with a slight gap; more than three oil outlet holes are uniformly arranged on the side wall of the lower end of the circular tube and are connected with the lower end of the inner cavity of the circular tube; the circular tube below the oil outlet holes is matched with the weight reduction pit of the outer ring with a gap.

[0005] Further preferably, the CG inner end section support seat is composed 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 a height proximity switch of the CG inner end section is installed on the vertical rod of the support frame. In this way, when different kinds of CG inner end sections with different heights are replaced for grease injection, the height of the liftable support rod is adjusted so that the upper end surface of the CG inner end section is as high as the height comparison ruler or the proximity switch is triggered. The grease can be injected into CG inner end sections of various heights, and the application range is wide.

[0006] Further preferably, a middle magnetic switch is arranged on the cylinder body below the center of the length of the pneumatic cylinder piston rod; when the magnetic ring on the piston rod is sensed by the middle magnetic switch, the grease injection head does not contact the CG inner end section with the highest height, and the piston rod continues to extend for 2-3 seconds, so that the grease injection head can hard contact the CG inner end section with the lowest height for grease injection. This structure can inject grease into the CG inner end section with the lowest height and the CG inner end section with the highest height, because when the piston rod extends to the hard contact between the grease injection head and the CG inner end section with the highest height, the CG inner end section hard prevents the cylinder from running, and since the hardness of the CG inner end section is much greater than the pressure of the cylinder, the pressure of the cylinder does not damage the CG inner end section. The grease can be injected into CG inner end sections of various heights, and the application range is wide.

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

[0008] Further preferably, the outer end of the load cell is covered by a protective cover.

[0009] The beneficial effects of the present application are as follows: the oil flows from the inner cavity of the blind hole of the grease injection head, and then flows out of the oil outlet holes in the side wall, and is pressed into the gap between the inner ring, the outer ring, the retainer and the steel balls of the inner end section of the CG, and the groove of the outer ring of the CG, thereby playing a role of lubricating the channel, effectively preventing the friction between the steel balls and the channel; the round pipe below the oil outlet holes of the grease injection head blocks the weight reduction pits of the outer ring of the CG, so that the oil no longer flows into the weight reduction pits, thereby not only reducing the amount of oil, avoiding the waste of oil, reducing the weight of the inner end section of the CG, meeting the requirements of lightening the automobile, but also preventing the oil from flowing into the center hole of the shaft, preventing the imbalance of the air pressure in the inner end section of the shaft and the pollution of the threads of the through hole of the outer end section of the CG, thereby improving the quality of the automobile drive shaft; in addition, the end cover of the grease injection head covers the product retainer, preventing the oil from flowing out of the upper side of the inner ring during the injection, thereby not only wasting the oil, but also making it difficult for the oil to flow into the channel; the load cell can not only detect the weight of the inner end section of the CG before the injection, preventing the inner end section of the CG from being short of parts such as steel balls, preventing unqualified products from flowing out, but also detecting the weight of the inner end section of the CG after the injection, detecting the weight of the injected oil, comparing the weight value with the injection amount set by the program, and alarming if the set value is exceeded, thereby effectively preventing the leakage and shortage of the oil, and preventing the occurrence of unqualified products; the quick plug can quickly replace the grease injection head, thereby being suitable for the injection of oil for various types of inner end sections of the CG, and having a wide range of applications.

[0010] In summary, the present application not only avoids the waste of oil, reduces the weight of the inner end section of the CG, meets the requirements of lightening the automobile, prevents the oil from flowing into the center hole of the shaft, maintains the balance of the air pressure in the inner end section of the shaft, prevents the pollution of the threads of the through hole of the outer end section of the CG, and improves the quality of the automobile drive shaft, but also has a wide range of applications. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic view of the present application; Figure 2 is a front view of the present application; Figure 3 is an AA sectional view of Figure 2 ; and Figure 4 is a cooperation structure between the grease injection head and the inner end section of the CG during the injection of the present application. DETAILED DESCRIPTION

[0012] The present application will be further described below in combination with specific embodiments.

[0013] For example, Figures 1 to 4As shown, the embodiment includes base 1, load cell 3 fixed on base 1, CG inner end piece support seat 4 placed on the upper end of load cell 3, support frame 8, air cylinder 14, grease pipe joint 15 and grease injection head 7. The outer end of load cell 3 of the embodiment is covered with protective cover 2, and base support is also arranged on base 1. Because the length of the piston rod of air cylinder 14 is the same each time, the CG inner end piece support seat 4 of the embodiment is composed of support plate 15 at the lower end, support rod 16 that can be lifted in the middle and positioning seat 5 at the upper end; support plate 15 is placed on the upper end of load cell 3; height comparison ruler or height proximity switch of CG inner end piece 6 is installed on the vertical rod of support frame 8. In this way, when different kinds of CG inner end pieces 6 with different heights are replaced for grease injection, as long as the height of liftable support rod 16 is adjusted, the upper end surface of CG inner end piece 6 is the same height as height comparison ruler or the proximity switch is triggered. It can adapt to various heights of CG inner end pieces for grease injection, and the application range is wide. Liftable support rod 16 is composed of outer sleeve and inner column, and the outer sleeve and the inner column are respectively provided with corresponding threaded holes, and after the height is adjusted, they are fixed together by fastening screws. CG inner end piece support seat 4 can also be composed of support plate 15 at the lower end, fixed length support rod and positioning seat 5 at the upper end; middle magnetic switch is arranged on the cylinder body below the center of the length of the piston rod of the cylinder by 30-35 mm; when the magnetic ring on the piston rod senses the middle magnetic switch when the piston rod of the cylinder is extended, grease injection head 7 does not contact the CG inner end piece 6 with the highest height, and when the piston rod of the cylinder is continuously extended for 2-3 seconds, grease injection head 7 can hard contact the CG inner end piece 6 with the lowest height for grease injection. This structure can inject grease for the CG inner end piece with the lowest height and the CG inner end piece with the highest height, because when the piston rod of the cylinder is extended to hard contact of the grease injection head with the CG inner end piece with the highest height, the CG inner end piece hard prevents the cylinder 14 from running, and since the hardness of CG inner end piece 6 is far greater than the pressure of cylinder 14, the pressure of the cylinder does not damage the CG inner end piece. It can inject grease for various heights of CG inner end pieces, and the application range is wide. Air cylinder 14 is fixed on the upper end plate 13 of support frame 8 through support seat 12. The upper end of grease pipe joint 15 is fixed on the piston rod of air cylinder 14 through fixing block 11, and the lower end is detachably and sealingly fixed on the upper end of grease injection head 7 through quick plug 9. The inner cavities of grease pipe joint 15, quick plug 9 and grease injection head 7 vertically penetrate and the center axes of the inner cavities coincide. CG inner end piece 6 is installed in positioning seat 5 at the upper end of CG inner end piece support seat 4, and the center axis coincides with the center axis of the inner cavity of grease injection head 7. Grease hose interface 10 is arranged on the side wall of grease pipe joint 15, and the grease hose interface 10 connects grease hose. The main body of grease injection head 7 is a circular tube with inner cavity 74, the inner cavity 74 of the circular tube is a blind hole, and the outer circle of the circular tube cooperates with the inner diameter 64 of the inner ring of CG inner end piece 6. The upper end port of the circular tube is provided with interface 71 sealingly connected with the lower end of quick plug 9, and the end cover 72 is arranged on the position close to the interface 71 of the upper end of the circular tube.When injecting grease, the lower end of the end cover 72 is clamped on the upper end of the outer edge of the CG inner end section holder 61, and the outer circle thereof is matched with the port micro-gap of the CG inner end section outer ring 63. The side wall of the lower end of the circular tube is uniformly provided with four (or six) oil outlet holes 73 which are connected with the lower end of the inner cavity of the circular tube. The circular tube below the oil outlet hole 73 is matched with the gap of the weight-reducing pit of the CG outer ring. 62 is a steel ball. The number of oil outlet holes of the grease injection head 7 is preferably the same as the number of steel balls 62 of the CG inner end section.

[0014] The above-mentioned cylinder 14 can also use an electric push rod, which can automatically adjust the length of the piston rod to adapt to the grease injection of CG inner end sections of different heights. However, the electric push rod has high cost, which will lead to high cost of the device.

[0015] The grease flows from the blind hole cavity 74 of the grease injection head 7, then flows out of each oil outlet hole 73 in the side wall, and is pressed into the gap between the inner ring 64, the outer ring 63, the holder 61 and the steel ball 62 of the CG inner end section 6 and the groove of the CG outer ring 63, thereby playing a role of lubricating the channel and effectively preventing friction between the steel ball 62 and the channel. The circular tube below the oil outlet hole 73 of the grease injection head 7 blocks the weight-reducing pit of the CG outer ring, so that the grease no longer flows into the weight-reducing pit 65. This not only reduces the amount of grease and avoids waste, but also reduces the weight of the CG inner end section, meets the requirements of automobile lightening, and prevents the grease from flowing into the center hole of the shaft rod, thereby preventing the imbalance of the shaft rod between the two end sections and the pollution of the grease to the thread of the through hole of the outer CG section, and improving the quality of the automobile drive shaft. Moreover, the end cover 72 of the grease injection head 7 covers the product holder 61, preventing the grease from flowing out of the upper side of the inner ring 64 during grease injection. This not only wastes grease, but also makes it difficult for the grease to enter the channel. The weighing sensor 3 can not only detect the weight of the CG inner end section before grease injection to prevent the CG inner end section from being installed with insufficient steel balls and other parts and to prevent unqualified products from flowing out, but also can detect the weight of the CG inner end section after grease injection to detect the weight of the injected grease. The weighing value is compared with the set grease injection amount, and an alarm is given if the set value is exceeded, thereby effectively preventing the leakage and shortage of grease injection and preventing the occurrence of unqualified products. The use of the quick plug 9 enables the grease injection head 7 to be quickly replaced to adapt to the injection of grease for CG inner end sections of various models, thereby having a wide range of applications.

[0016] The above-mentioned embodiments are only preferred and exemplary, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A CG inner end section grease injection device, characterized by: The grease pump of the present invention is to be connected with the grease pump of the present invention in a sealed manner to the upper end of the grease pump, and the grease pump of the present invention is connected with the grease pump of the present invention in a sealed manner to the upper end of the grease pump. An end cap is provided at the upper end of the circular tube near the interface; when grease is injected, the lower end of the end cap is clamped on the outer edge of the upper end of the CG inner end section retainer, and the outer circle of the end cap is matched with a slight gap between the outer circle of the CG inner end section outer ring port; more than 3 oil outlet holes connected to the lower end of the inner cavity of the circular tube are evenly opened on the side wall; the gap between the circular tube below the oil outlet hole and the CG outer ring weight reduction pit is matched.

2. The CG inner end section grease injection device according to claim 1, characterized in that: The CG inner end section support seat 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 CG inner end section grease injection device according to claim 1, characterized in that: A mid-position magnetic switch is provided on the cylinder body 30-35 mm below the center of the length of the cylinder piston rod; when the cylinder piston rod is extended to the point where the magnetic ring on the piston rod senses the mid-position magnetic switch, the grease injection head does not contact the highest CG inner end section, and when the cylinder piston rod continues to be extended for 2-3 seconds, the grease injection head can make hard contact with the lowest CG inner end section for grease injection.

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

5. The CG inner end section grease injection device 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 section 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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