New energy automobile transmission gear

Abstract

A new energy automobile transmission gear comprises a gear body and a plurality of gear teeth circumferentially and evenly arranged on the outer circumferential face of the gear body, a tooth groove is formed between every two adjacent gear teeth, the gear body is composed of a left gear body and a right gear body located on the right side of the left gear body, and the left gear body and the right gear body are symmetrical to each other; the left gear body and the right gear body are fixed through a limiting structure. A clamping groove is formed in the side wall of the front side of the right gear body; a sealing cover matched with the clamping groove is arranged in the clamping groove, and the sealing cover and the bottom of the clamping groove are fixed through a plurality of evenly-distributed screws. An oil storage groove is formed in the center of the bottom of the clamping groove. According to the new energy automobile transmission gear, the transmission gear can be automatically lubricated, the situation that the transmission gear continuously rotates and meshes under the condition that lubricating grease is not used for lubrication is avoided, the anti-abrasion effect is achieved, and the replacement cost of the transmission gear can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of new energy vehicles, in particular to a transmission gear for a new energy vehicle. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional automotive fuels as their power source (or use conventional automotive fuels and adopt new on-board power devices), and integrate advanced technologies in vehicle power control and drive to form vehicles with advanced technical principles, new technologies, and new structures.

[0003] The most common new energy vehicle is the electric car, which can convert electrical energy into mechanical energy, realize force transmission through the transmission mechanism, and finally realize the driving of the electric car. The most common part in the transmission mechanism is the transmission gear. During the driving of the new energy vehicle, the transmission gear will continue to rotate and mesh with other accessories, which will cause the transmission gear to be easily worn during the long-term meshing process. In order to avoid the wear of the transmission gear, grease will be applied to the teeth and tooth groove surfaces of the transmission gear at the beginning of the assembly of the transmission gear. However, as the transmission gear continues to rotate and mesh, the grease is easily consumed. Since the transmission gear is inside the transmission mechanism and is extremely difficult to be found, it is very easy for the grease on the surface of the transmission gear to be consumed and the transmission gear is still in a state of continuous rotation and meshing, which eventually causes the transmission gear to wear. Once the transmission gear is worn, the meshing gap between the transmission gear and other accessories will become larger, which will affect the stability during force transmission and pose certain safety hazards.

[0004] The transmission gears of traditional new energy vehicles are one-piece molded structures. Once the transmission gears are worn, they can only be replaced as a whole. If the transmission gears are small in size, the replacement cost is still within a controllable range. However, if the transmission gears are large in size, the replacement cost is higher. If the gears are replaced as a whole every time they are damaged, the replacement cost will be seriously increased. Summary of the invention

[0005] The utility model aims to solve the existing technical problem and provide a new energy vehicle transmission gear, which can not only automatically lubricate the transmission gear to prevent the transmission gear from continuously rotating and meshing without grease lubrication, thereby preventing wear, but also effectively reduce the replacement cost of the transmission gear.

[0006] The technical solution adopted by the utility model to solve the above technical problems is:

[0007] The utility model discloses a transmission gear for a new energy vehicle, comprising a gear body, a plurality of gear teeth uniformly arranged on the outer peripheral surface of the gear body in a circumferential manner, and tooth grooves between adjacent gear teeth, the gear body consisting of a left gear body and a right gear body located on the right side of the left gear body, the left gear body and the right gear body being symmetrical to each other; the left gear body and the right gear body are fixed to each other through a limiting structure; a clamping groove is arranged on the front side wall of the right gear body; a sealing cover matching with the clamping groove is arranged in the clamping groove, and the sealing cover is fixed to the bottom of the clamping groove through a plurality of uniformly distributed screws; an oil storage groove is arranged at the center of the bottom of the clamping groove; a clamping hole is arranged at the center of the bottom of one of the tooth grooves corresponding to the position of the oil storage groove; an oil through hole communicating with the oil storage groove is arranged at the center of the bottom of the clamping hole; a plug is screwed in the orifice through which the oil through hole and the clamping hole communicate; a clamping portion fitting with the bottom of the clamping hole is arranged on the outer wall of the end of the plug away from the oil storage groove; an oil outlet structure communicating with the oil through hole is arranged at the center of the plug.

[0008] The oil outlet structure includes a transition hole arranged in the middle of the plug; an oil inlet hole communicating with the transition hole is arranged at the center of an end face of the plug adjacent to the oil storage tank; an oil outlet hole communicating with the transition hole is arranged at the center of an end face of the plug away from the oil storage tank; the diameter of the oil inlet hole gradually decreases toward the transition hole; and the diameter of the oil outlet hole gradually increases toward the direction away from the transition hole.

[0009] The oil outlet hole and the tooth groove are connected to each other at the upper and lower sides of the hole opening at one end thereof.

[0010] The limiting structure includes a plurality of left longitudinal grooves evenly arranged on the front and rear sides of the left gear body; the front and rear sides of the left gear body are provided with left transverse grooves that penetrate the middle of the left longitudinal groove, and the left transverse groove and the left longitudinal groove are perpendicular to each other; the right side notch of the left transverse groove is located on the right side wall of the left gear body; the front and rear sides of the right gear body are provided with a plurality of right longitudinal grooves corresponding to the positions of the left longitudinal grooves; the front and rear sides of the right gear body are provided with a plurality of right transverse grooves that penetrate the middle of the right longitudinal groove, and the right transverse groove and the right longitudinal groove are perpendicular to each other; the left side notch of the right transverse groove is located on the left side wall of the right gear body; a left limiting block matching therewith is provided in the left longitudinal groove; a right limiting block matching therewith is provided in the right longitudinal groove; the left limiting block and the right limiting block are connected by a limiting strip, and the limiting strip is embedded in the left transverse groove and the right transverse groove at the same time; the left limiting blocks on the front and rear sides and the right limiting blocks on the front and rear sides are all connected by a connecting structure.

[0011] The connecting structure includes a left through hole provided on the left limit block; a left connecting hole penetrates the left longitudinal grooves on the front and rear sides, and the left connecting hole is coaxial with the left through hole; a right connecting hole penetrates the right longitudinal grooves on the front and rear sides; a right through hole coaxial with the right connecting hole is provided on the right limit block; a left screw rod simultaneously passes through the left through hole and the left connecting hole on the left limit blocks on the front and rear sides; the front end of the left screw rod is screwed with a left front nut which fits with the front left limit block, and the rear end of the left screw rod is screwed with a left rear nut which fits with the rear left limit block; a right screw rod simultaneously passes through the right through hole and the right connecting hole on the right limit blocks on the front and rear sides; the front end of the right screw rod is screwed with a right front nut which fits with the front right limit block, and the rear end of the right screw rod is screwed with a right rear nut which fits with the rear right limit block.

[0012] The outer walls at both ends of the left screw are provided with a ring-shaped left positioning groove; a left retaining spring matching it is provided in the left positioning groove, and the outer edge of the left retaining spring protrudes out of the left positioning groove; the left front nut is located between the front left retaining spring and the front side wall of the left gear body, and the left rear nut is located between the rear left retaining spring and the rear side wall of the left gear body.

[0013] The outer walls at both ends of the right screw are provided with a right annular positioning groove; a right retaining spring matching it is provided in the right positioning groove, and the outer edge of the right retaining spring protrudes out of the right positioning groove; the right front nut is located between the front right retaining spring and the front side wall of the right gear body, and the right rear nut is located between the rear right retaining spring and the rear side wall of the right gear body.

[0014] The bottom of the card slot is provided with a plurality of screw holes corresponding to the screw positions; the sealing cover is provided with a plurality of fixing holes corresponding to the screw hole positions; the screws pass through the fixing holes and are screwed into the corresponding screw holes, and the heads of the screws fit against the front side wall of the sealing cover.

[0015] The beneficial effects of the utility model are:

[0016] Compared with the prior art, the transmission gear of a new energy vehicle adopting the structure of the utility model can store grease in an oil storage tank, and then use the centrifugal force generated by the rotation of the transmission gear to transport the grease in the oil storage tank to the tooth groove little by little, and then use the rotational engagement between the transmission gear and other accessories to spread the grease on the teeth and tooth groove surface of the transmission gear, thereby achieving automatic lubrication and effectively preventing wear. Moreover, when the teeth of the transmission gear are worn, there is no need to replace the entire transmission gear, but only the left gear body or the right gear body with the worn gear needs to be replaced separately, thereby effectively reducing the replacement cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the transmission gear of the utility model new energy vehicle;

[0018] Figure 2 yes Figure 1 An enlarged view of part A;

[0019] Figure 3 It is a partial cross-sectional view of the right gear body;

[0020] Figure 4 is a cross-sectional view of the left gear body;

[0021] Figure 5 It is a cross-sectional view of the right gear body. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] See also Figures 1 to 5 The utility model provides a new energy vehicle transmission gear, including a gear body 1, a plurality of gear teeth 2 uniformly arranged on the outer circumference of the gear body 1, and a tooth groove 3 between adjacent gear teeth 2. The gear body 1 is composed of a left gear body 101 and a right gear body 102 located on the right side of the left gear body 101. The left gear body 101 and the right gear body 102 are symmetrical to each other; the left gear body 101 and the right gear body 102 are fixed by a limiting structure; a card slot 4 is provided on the front side wall of the right gear body 102; a sealing cover 5 matching with the card slot 4 is provided in the card slot 4 The sealing cover 5 is fixed to the bottom of the card slot 4 by a number of evenly distributed screws 36; an oil storage groove 6 is provided at the center of the bottom of the card slot 4; a positioning hole 7 is provided at the center of the bottom of one of the tooth grooves 3 corresponding to the position of the oil storage groove 6; an oil through hole 8 communicating with the oil storage groove 6 is provided at the center of the bottom of the positioning hole 7; a plug 9 is screwed into the hole opening communicating with the oil through hole 8 and the positioning hole 7; a positioning portion 10 that fits with the bottom of the positioning hole 7 is provided on the outer wall of the end of the plug 9 away from the oil storage groove 6; an oil outlet structure communicating with the oil through hole 8 is provided at the center of the plug 9.

[0024] The oil outlet structure includes a transition hole 11 arranged in the middle of the plug 9; an oil inlet hole 12 communicating with the transition hole 11 is arranged at the center of the end face of one end of the plug 9 adjacent to the oil storage tank 6; an oil outlet hole 13 communicating with the transition hole 11 is arranged at the center of the end face of one end of the plug 9 away from the oil storage tank 6; the diameter of the oil inlet hole 12 gradually decreases toward the transition hole 11; the diameter of the oil outlet hole 13 gradually increases toward the direction away from the transition hole 11.

[0025] A straight groove 14 is provided on the upper and lower sides of the hole opening of one end of the oil outlet hole 13 that is in communication with the tooth groove 3.

[0026] The limiting structure includes a plurality of left longitudinal grooves 39 uniformly arranged on the front and rear sides of the left gear body 101; the left gear body 101 is provided with a left transverse groove 15 intersecting with the middle of the left longitudinal groove 39 on the front and rear sides, and the left transverse groove 15 and the left longitudinal groove 39 are perpendicular to each other; the right notch of the left transverse groove 15 is located on the right side wall of the left gear body 101; the right gear body 102 is provided with a plurality of right longitudinal grooves 16 corresponding to the positions of the left longitudinal grooves 39 on the front and rear sides; the right gear body 102 is provided with a plurality of right transverse grooves 17 intersecting with the middle of the right longitudinal groove 16 on the front and rear sides The right transverse groove 17 and the right longitudinal groove 16 are perpendicular to each other; the left notch of the right transverse groove 17 is located on the left side wall of the right gear body 102; a left limit block 18 matching with it is provided in the left longitudinal groove 39; a right limit block 19 matching with it is provided in the right longitudinal groove 16; the left limit block 18 and the right limit block 19 are connected by a limit strip 20, and the limit strip 20 is embedded in the left transverse groove 15 and the right transverse groove 17 at the same time; the left limit blocks 18 on the front and rear sides and the right limit blocks 19 on the front and rear sides are connected by a connecting structure.

[0027] The connecting structure includes a left through hole 21 provided on the left limit block 18; a left connecting hole 22 interpenetrates the left longitudinal grooves 39 on the front and rear sides, and the left connecting hole 22 is coaxial with the left through hole 21; a right connecting hole 24 interpenetrates the right longitudinal grooves 16 on the front and rear sides; a right through hole 25 coaxial with the right connecting hole 24 is provided on the right limit block 19; a left screw rod 26 passes through the left through hole 21 and the left connecting hole 22 on the left limit blocks 18 on the front and rear sides at the same time; the left The front end of the screw rod 26 is screwed with a left front nut 27 that fits with the front left limit block 18, and the rear end of the left screw rod 26 is screwed with a left rear nut 28 that fits with the rear left limit block 18; a right screw rod 29 simultaneously passes through the right through hole 25 and the right connecting hole 24 on the right limit block 19 on the front and rear sides; the front end of the right screw rod 29 is screwed with a right front nut 30 that fits with the front right limit block 19, and the rear end of the right screw rod 29 is screwed with a right rear nut 31 that fits with the rear right limit block 19.

[0028] The outer walls at both ends of the left screw rod 26 are provided with a ring-shaped left positioning groove 32; a left retaining spring 33 matching with the left positioning groove 32 is provided in the left retaining spring 33, and the outer edge of the left retaining spring 33 protrudes out of the left positioning groove 32; the left front nut 27 is located between the front left retaining spring 33 and the front side wall of the left gear body 101, and the left rear nut 28 is located between the rear left retaining spring 33 and the rear side wall of the left gear body 101.

[0029] The outer walls at both ends of the right screw rod 29 are provided with a right annular positioning groove 34; a right retaining spring 35 matching with the right retaining spring 35 is provided in the right positioning groove 34, and the outer edge of the right retaining spring 35 protrudes out of the right positioning groove 34; the right front nut 30 is located between the front right retaining spring 35 and the front side wall of the right gear body 102, and the right rear nut 31 is located between the rear right retaining spring 35 and the rear side wall of the right gear body 102.

[0030] The bottom of the slot 4 is provided with a plurality of screw holes 37 corresponding to the positions of the screws 36; the sealing cover 5 is provided with a plurality of fixing holes 38 corresponding to the positions of the screw holes 37; the screws 36 pass through the fixing holes 38 and are screwed into the corresponding screw holes 37, and the heads of the screws 36 fit against the front side wall of the sealing cover 5.

[0031] The method of using the utility model is as follows:

[0032] The sealing cover 5 is fixed by screws, which makes it easy to disassemble and assemble the sealing cover 5. The sealing cover 5 can be disassembled by simply unscrewing the screws 36 from the screw holes 37. At this time, a large amount of grease can be filled into the oil storage tank 6. After the grease is added, the sealing cover 5 can be fixed in the card slot 4 again by the screws 36. At this time, the sealing cover 5 covers and seals the notch of the oil storage tank 6. When the transmission gear meshes with other accessories and rotates, the rotating transmission gear will generate centrifugal force, and the centrifugal force will throw the grease away from the center of the gear body 1. At this time, the grease will pass through the oil through hole 8, the oil inlet hole 12, the transition hole 11, and the oil outlet hole 13 in sequence. After entering the tooth groove 3, as the gear body 1 continues to rotate and mesh with other accessories, the grease will eventually cover the gear teeth and the tooth groove surface, realizing the function of automatic lubrication. In actual use, the shape of the oil storage tank can be designed. It is only necessary to gradually reduce the groove width of the oil storage tank 6 toward the oil through hole 8, so that the grease in the oil storage tank 6 can be more easily thrown into the oil through hole 8. Since the grease is different from lubricating oil and is solid, even under the action of centrifugal force, the grease will be thrown into the tooth groove 3, but the actual outflow rate of the grease is extremely limited, which effectively avoids the waste of grease due to excessive outflow speed when the transmission gear rotates and meshes.

[0033] If a part of the gear teeth on the outer peripheral surface of the gear body 1 is worn, there is no need to replace the entire gear body 1. Since the gear body 1 is composed of a left gear body 101 and a right gear body 102, it is only necessary to make sure that the worn gear teeth 2 are on the left gear body 101 or the right gear body 102, and then replace the left gear body 101 or the right gear body 102 with the worn gear teeth separately. When it is necessary to replace the left gear body 101 or the right gear body 102 separately, the left gear body 101 and the right gear body 102 can be separated. At this time, it is only necessary to remove the left front nut 27 and the left rear nut 28 from the left screw rod 26. Unscrew the front and rear ends, unscrew the right front nut 30 and the right rear nut 31 from the front and rear ends of the right screw rod 29, and then pull out the left screw rod 26 and the right screw rod 29, so that the left limit block 18 can be removed from the left longitudinal groove 39, the right limit block 19 can be removed from the right longitudinal groove 16, and the limit strip 20 can be removed from the left transverse groove 15 and the right transverse groove 17. After losing the restrictions of the left limit block 18, the right limit block 19 and the limit strip 20, the left gear body 101 and the right gear body 102 can be separated, thereby realizing the separate replacement of the left gear body 101 and the right gear body 102.

[0034] In summary, the utility model can store grease in the oil storage tank 6, and then use the centrifugal force generated by the rotation of the transmission gear to transport the grease in the oil storage tank 6 to the tooth groove little by little, and then use the rotational engagement between the transmission gear and other accessories to spread the grease all over the surface of the gear teeth 2 and the tooth groove 3 of the transmission gear, thereby achieving automatic lubrication and effectively preventing wear. Moreover, when the gear teeth 2 of the transmission gear are worn, there is no need to replace the entire transmission gear, and only the left gear body 101 or the right gear body 102 with the worn gear needs to be replaced separately, thereby effectively reducing the replacement cost.

[0035] The diameter of the oil inlet hole 12 gradually decreases toward the transition hole 11, which can transport the grease toward the tooth groove 3 faster, while the diameter of the oil outlet hole 13 gradually increases in the direction away from the transition hole 11, which can effectively shorten the actual length of the transition hole 11, avoiding the situation where the transition hole 11 has a small aperture and a long length, which easily causes the grease to stagnate in the transition hole 11, and ensuring that the grease can be smoothly transported to the tooth groove 3 while avoiding the grease flow rate being too fast.

[0036] A slot 14 is provided on the upper and lower sides of the hole opening at one end of the oil outlet hole 13 that intersects the tooth groove 3. The slot 14 can be used with a slotted screwdriver to facilitate rotating the plug with the slotted screwdriver, which is beneficial to the disassembly and assembly of the plug 9.

[0037] The outer walls of the front and rear ends of the left screw rod 26 are both provided with an annular left positioning groove 32, and a left retaining spring 33 matching it is provided in the left positioning groove 32. The outer edge of the left retaining spring 33 protrudes out of the left positioning groove 32. The left front nut 27 is located between the front left retaining spring 33 and the front side wall of the left gear body 101, and the left rear nut 28 is located between the rear left retaining spring 33 and the rear side wall of the left gear body 101. The existence of the left retaining spring 33 can effectively limit the positions of the left front nut 27 and the left rear nut 28 to prevent the left front nut 27 and the left rear nut 28 from loosening.

[0038] The outer walls at both ends of the right screw rod 29 are provided with an annular right positioning groove 34, and a right retaining spring 35 matching it is provided in the right positioning groove 34. The outer edge of the right retaining spring 35 protrudes out of the right positioning groove 34. The right front nut 30 is located between the front right retaining spring 35 and the front side wall of the right gear body 102, and the right rear nut 31 is located between the rear right retaining spring 35 and the rear side wall of the right gear body 102. The existence of the right retaining spring 35 can effectively limit the position of the right front nut 30 and the right rear nut 31 to prevent the right front nut 30 and the right rear nut 31 from loosening.

Claims

1. A transmission gear for a new energy vehicle, comprising a gear body, a plurality of gear teeth uniformly arranged on the outer peripheral surface of the gear body, and tooth grooves between adjacent gear teeth, characterized in that: The gear body is composed of a left gear body and a right gear body located on the right side of the left gear body, and the left gear body and the right gear body are symmetrical to each other; the left gear body and the right gear body are fixed to each other by a limiting structure; a clamping groove is provided on the front side wall of the right gear body; a sealing cover matching with it is provided in the clamping groove, and the sealing cover and the bottom of the clamping groove are fixed by a number of evenly distributed screws; an oil storage groove is provided at the center of the bottom of the clamping groove; a locking hole is provided at the center of the bottom of one of the tooth grooves corresponding to the position of the oil storage groove; an oil through hole communicating with the oil storage groove is provided at the center of the bottom of the locking hole; a plug is screwed in the orifice of the oil through hole communicating with the locking hole; a locking portion fitting with the bottom of the locking hole is provided on the outer wall of the end of the plug away from the oil storage groove; an oil outlet structure communicating with the oil through hole is provided at the center of the plug.

2. A new energy vehicle transmission gear according to claim 1, characterized in that: The oil outlet structure includes a transition hole arranged in the middle of the plug; an oil inlet hole communicating with the transition hole is arranged at the center of an end face of the plug adjacent to the oil storage tank; an oil outlet hole communicating with the transition hole is arranged at the center of an end face of the plug away from the oil storage tank; the diameter of the oil inlet hole gradually decreases toward the transition hole; and the diameter of the oil outlet hole gradually increases toward the direction away from the transition hole.

3. A new energy vehicle transmission gear according to claim 2, characterized in that: The oil outlet hole and the tooth groove are connected to each other at the upper and lower sides of the hole opening at one end thereof.

4. The new energy vehicle transmission gear according to claim 1, characterized in that: The limiting structure includes a plurality of left longitudinal grooves evenly arranged on the front and rear sides of the left gear body; the front and rear sides of the left gear body are provided with left transverse grooves that penetrate the middle of the left longitudinal groove, and the left transverse groove and the left longitudinal groove are perpendicular to each other; the right side notch of the left transverse groove is located on the right side wall of the left gear body; the front and rear sides of the right gear body are provided with a plurality of right longitudinal grooves corresponding to the positions of the left longitudinal grooves; the front and rear sides of the right gear body are provided with a plurality of right transverse grooves that penetrate the middle of the right longitudinal groove, and the right transverse groove and the right longitudinal groove are perpendicular to each other; the left side notch of the right transverse groove is located on the left side wall of the right gear body; a left limiting block matching therewith is provided in the left longitudinal groove; a right limiting block matching therewith is provided in the right longitudinal groove; the left limiting block and the right limiting block are connected by a limiting strip, and the limiting strip is embedded in the left transverse groove and the right transverse groove at the same time; the left limiting blocks on the front and rear sides and the right limiting blocks on the front and rear sides are all connected by a connecting structure.

5. The new energy vehicle transmission gear according to claim 4, characterized in that: The connecting structure includes a left through hole provided on the left limit block; a left connecting hole penetrates the left longitudinal grooves on the front and rear sides, and the left connecting hole is coaxial with the left through hole; a right connecting hole penetrates the right longitudinal grooves on the front and rear sides; a right through hole coaxial with the right connecting hole is provided on the right limit block; a left screw rod simultaneously passes through the left through hole and the left connecting hole on the left limit blocks on the front and rear sides; the front end of the left screw rod is screwed with a left front nut which fits with the front left limit block, and the rear end of the left screw rod is screwed with a left rear nut which fits with the rear left limit block; a right screw rod simultaneously passes through the right through hole and the right connecting hole on the right limit blocks on the front and rear sides; the front end of the right screw rod is screwed with a right front nut which fits with the front right limit block, and the rear end of the right screw rod is screwed with a right rear nut which fits with the rear right limit block.

6. A new energy vehicle transmission gear according to claim 5, characterized in that: The outer walls at both ends of the left screw are provided with a ring-shaped left positioning groove; a left retaining spring matching it is provided in the left positioning groove, and the outer edge of the left retaining spring protrudes out of the left positioning groove; the left front nut is located between the front left retaining spring and the front side wall of the left gear body, and the left rear nut is located between the rear left retaining spring and the rear side wall of the left gear body.

7. The new energy vehicle transmission gear according to claim 5, characterized in that: The outer walls at both ends of the right screw are provided with a right annular positioning groove; a right retaining spring matching it is provided in the right positioning groove, and the outer edge of the right retaining spring protrudes out of the right positioning groove; the right front nut is located between the front right retaining spring and the front side wall of the right gear body, and the right rear nut is located between the rear right retaining spring and the rear side wall of the right gear body.

8. The new energy vehicle transmission gear according to claim 1, characterized in that: The bottom of the card slot is provided with a plurality of screw holes corresponding to the screw positions; the sealing cover is provided with a plurality of fixing holes corresponding to the screw hole positions; the screws pass through the fixing holes and are screwed into the corresponding screw holes, and the heads of the screws fit against the front side wall of the sealing cover.

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