High-safety automobile brake camshaft

Abstract

The utility model discloses a high safety's automobile brake camshaft, it includes transmission shaft (1), be equipped with a plurality of transmission area on transmission shaft (1), every transmission area all is equipped with first spline groove (2) and a plurality of first spline (3), every transmission area all is installed with main cam block (4), every main cam block (4) all is equipped with a plurality of second spline groove (5) with first spline (3) cooperation, be equipped with the opening on main cam block (4), the opening is installed with the positioning block (6) of sliding, be equipped with second spline (7) with first spline groove (2) cooperation on positioning block (6), every two transmission area between every adjacent all is equipped with installation area, and the outer diameter of installation area is less than the outer diameter of transmission area, the width of opening is greater than the outer diameter of installation area and less than the outer diameter of transmission area. The utility model not only can improve the safety of use, still have the advantage that overhauling is convenient, structural stability is high, work stability is high and service life is long.

Description

Technical Field

[0001] This utility model relates to a camshaft, and more particularly to a high-safety automotive brake camshaft. Background Technology

[0002] The brake camshaft is one of the core drive components of an automotive drum brake. Its function is to convert rotational motion into radial opening motion of the brake shoes under the push of the brake chamber, so that the shoes press against the inner wall of the brake chamber to achieve braking. Common brake camshafts are usually solid or hollow cylindrical shafts with helical grooves or eccentric arc cams machined on the surface. Under frequent, heavy-load braking, this type of integral brake cam is prone to bending deformation or even breakage due to stress concentration, affecting the overall braking safety. Although some brake camshafts adopt a split structure, such as the one described in Chinese patent publication "CN202323441988.9", in which the eccentric arc cam is manufactured separately from the entire cylindrical shaft and then installed on the cylindrical shaft by bolts and other fasteners, this can avoid bending deformation or breakage caused by stress concentration to a certain extent. However, during long-term use, the fasteners are prone to loosening, which can cause the eccentric arc cam to shift or slide, failing to achieve the braking effect and also affecting the overall braking safety. Therefore, existing split-type brake camshafts have poor braking safety when used for a long time. Utility Model Content

[0003] The purpose of this invention is to provide a highly safe automotive brake camshaft. This invention has the advantage of high safety in use.

[0004] The technical solution of this utility model is as follows: A high-safety automotive brake camshaft includes a drive shaft with multiple evenly distributed drive zones. Each drive zone has a first spline groove in its center, and multiple annularly distributed first splines on both sides of each first spline groove. A main cam block is mounted on each drive zone, and each main cam block has a second spline groove corresponding to the first spline at its position. An opening is provided on the main cam block corresponding to the first spline groove, and a positioning block is slidably mounted on the opening. The bottom surface of the positioning block has a second spline that mates with the first spline groove. An installation area is provided between each pair of adjacent drive zones, with the outer diameter of the installation area being smaller than the outer diameter of the drive zone. The width of the opening is greater than the outer diameter of the installation area, and the width of the opening on the main cam block is smaller than the outer diameter of the drive zone. The diameter of the drive zone is set to be larger than the diameter of the installation area, and the width of the opening on the main cam block is greater than the outer diameter of the installation area, so that when installing the main cam block, it is first inserted through the opening. The main cam block is installed on the drive shaft via the mounting area. Then, it is moved to one side of the drive area. The first and second splines ensure the main cam block is stably mounted on the drive area. Finally, a positioning block is inserted into the opening, forming a complete cam structure. When the entire cam structure needs to be replaced, simply remove the positioning block and move the main cam block towards the mounting area. This allows for easy replacement of the cam structure compared to the previous method where the cam structure was integrated with the camshaft. This simplifies maintenance and reduces costs. The interplay of the first and second splines ensures a more stable connection and transmission between the main cam block, positioning block, and drive area. This not only guarantees structural stability but also prevents cam misalignment, loosening, or failure to rotate with the drive shaft, which could lead to unstable and unsafe braking. This ensures safety during use.

[0005] In the aforementioned high-safety automotive brake camshaft, vertical grooves are provided on both inner sidewalls of the opening, and slots are provided at both the upper and lower ends of the grooves; slide bars that cooperate with the grooves are provided on both sides of the positioning block, and locking blocks that cooperate with the slots are provided at both ends of each slide bar; slots are provided at both the upper and lower ends of the bottom surface of the groove, which, together with the slide bars on the positioning block and the two locking blocks, make the installation between the positioning block and the opening smoother and the connection tighter, further ensuring the stability of the structure.

[0006] In the aforementioned high-safety automotive brake camshaft, a mounting channel is provided through the middle of the drive shaft along its axis. Two symmetrically arranged, semi-circular first positioning channels are provided on the inner wall of the mounting channel. The mounting channel is filled with a high-manganese steel core, and two symmetrically distributed, semi-circular second positioning channels are provided on the outer surface of the high-manganese steel core. A limiting component is installed between the first and second positioning channels, and a rubber buffer sleeve is covered on the surface of the limiting component. The outer diameter of the rubber buffer sleeve is the same as the sum of the radii of the first and second positioning channels. The high-manganese steel core increases the toughness of the entire drive shaft, improving its fracture resistance and further enhancing its safety. The limiting component effectively restricts the position of the high-manganese steel core within the mounting channel. Combined with the friction between the rubber buffer sleeve and the inner walls of the first and second positioning channels, the high-manganese steel core can be stably installed within the mounting channel, ensuring structural stability. Furthermore, the rubber buffer sleeve also provides cushioning, absorbing some impact force and improving the overall stability and safety of the drive shaft transmission.

[0007] In the aforementioned high-safety automotive brake camshaft, a lubricating oil passage is provided along the axial direction inside the drive shaft, and an oil outlet channel is provided on each of the two sides of each main cam block on the lubricating oil passage; the end face of each oil outlet channel is provided on the outer surface of the transmission area; the lubricating oil passage is located on one side of the mounting channel; the lubricating oil passage and the oil outlet channel can provide lubricating oil to the main cam block to ensure the normal operation of the camshaft and ensure the stability of the operation.

[0008] In the aforementioned high-safety automotive brake camshaft, the outer surfaces of the main cam block and the positioning block are coated with an alloy coating, the thickness of which is 0.1mm to 0.3mm.

[0009] In the aforementioned high-safety automotive brake camshaft, a first limiting member is fixedly installed on one side of the transmission area corresponding to the main cam block, and a second limiting member is threadedly installed on the other side of the transmission area corresponding to the main cam block; the end faces of both the second limiting member and the first limiting member are located below the end face of the main cam block; the first limiting member and the second limiting member can further limit the installation position of the main cam block, avoid the phenomenon of displacement, and ensure the safety of transmission.

[0010] In the aforementioned high-safety automotive brake camshaft, an oil slinger is fixedly installed on the mounting area, and an annular oil groove is provided in the middle of the outer surface of the oil slinger; two symmetrically arranged transverse oil slingers are opened at the middle end of the oil groove and are connected to the oil groove; when the oil outlet channel is blocked, lubricating oil can be added to the oil groove to achieve the purpose of lubricating the main cam blocks on both sides, thus ensuring the stability of operation.

[0011] Compared with the prior art, this utility model improves the existing brake camshaft by providing multiple cross-arranged transmission zones and mounting zones on the drive shaft. The diameter of the transmission zone is larger than the diameter of the mounting zone, and the width of the opening on the main cam block is larger than the outer diameter of the mounting zone. This allows the main cam block to be installed on the drive shaft first through the opening and then through the mounting zone. Then, by moving the main cam block to one side of the transmission zone, the first spline and second spline groove ensure the main cam block is stably mounted on the transmission zone. Finally, the positioning block is inserted into the opening and fixed on the transmission zone using the first spline groove and second spline groove. This allows the main cam block and the positioning block to form a complete convex shape. The wheel structure allows for easy replacement of the entire cam structure. When the entire cam structure needs to be replaced, simply remove the locating block and move the main cam block towards the installation area. This facilitates maintenance and reduces costs compared to the previous method where the cam structure was integrated with the camshaft. Furthermore, the interlocking of the first and second splines ensures a more stable connection and transmission between the main cam block, locating block, and transmission area. This not only guarantees structural stability but also prevents cam misalignment, loosening, or failure to rotate with the transmission shaft, which could lead to unstable and unsafe braking. This ensures safety during use.

[0012] Furthermore, this utility model also features a sliding groove on the inner wall of the opening, with slots at both the upper and lower ends of the bottom surface of the groove. This, combined with the sliding strip on the positioning block and two locking blocks, ensures smoother installation and tighter connection between the positioning block and the opening, further guaranteeing structural stability. By providing a first limiting member fixed to the transmission area on both sides of the main cam block and a second limiting member threaded onto the transmission area, the installation position of the main cam block is further limited, preventing displacement and ensuring transmission safety. An installation channel is provided through the middle of the transmission shaft, filled with a high-manganese steel core. This high-manganese steel core increases the toughness of the entire transmission shaft, improving its fracture resistance and further enhancing safety. A first positioning channel is provided on the installation channel, and a second positioning channel is provided on the high-manganese steel core. A limiting member is filled between the first and second positioning channels, and the surface of the limiting member is covered with a rubber buffer sleeve. This limiting member increases the support for the high-manganese steel core. The limiting effect of its position within the installation channel, combined with the friction between the rubber buffer sleeve and the inner walls of the first and second positioning channels, ensures the stable installation of the high-manganese steel core within the installation channel, guaranteeing structural stability. Furthermore, the rubber buffer sleeve provides cushioning, absorbing some impact and improving the overall stability of the drive shaft transmission. Lubrication channels within the drive shaft, connected to multiple oil outlet channels, provide lubrication to the main cam block, ensuring normal camshaft operation and stability. Alloy coatings on the outer surfaces of both the main cam block and the positioning block enhance their wear and corrosion resistance, ensuring braking performance even in harsh environments and extending service life and maintenance cycles. The installation of an oil slinger with oil grooves and transverse oil channels allows for lubrication of the main cam blocks on both sides by adding lubricating oil to the oil grooves when the oil outlet channels are blocked, ensuring operational stability. Therefore, this utility model not only improves the safety of use, but also has the advantages of convenient maintenance, high structural stability, high operational stability and long service life. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the connection structure between the main cam block and the positioning component; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a side view of the present invention; Figure 5 yes Figure 4 A magnified view of a section at point B.

[0014] The labels in the attached diagram are as follows: 1-drive shaft, 2-first spline groove, 3-first spline, 4-main cam block, 5-second spline groove, 6-positioning block, 7-second spline, 8-first limiting component, 9-second limiting component, 10-installation channel, 11-first positioning channel, 12-high manganese steel core, 13-second positioning channel, 14-limiting component, 15-rubber buffer sleeve, 16-lubricating oil passage, 17-oil outlet channel, 18-alloy coating, 19-oil slinger, 20-oil groove, 21-transverse oil slinger groove, 22-slide groove, 23-slot, 24-slide bar, 25-block. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0016] Example. A high-safety automotive brake camshaft, configured as follows: Figures 1 to 5 As shown, the system includes a drive shaft 1 with multiple evenly distributed drive zones. Each drive zone has a first spline groove 2 in the center, and multiple evenly distributed annular first splines 3 on both sides of each first spline groove 2. Each drive zone is equipped with a main cam block 4, and each main cam block 4 has a second spline groove 5 corresponding to the first spline 3 at its position. The main cam block 4 has an opening corresponding to the first spline groove 2, and a positioning block 6 is slidably mounted on the opening. The bottom surface of the positioning block 6 has a second spline 7 that mates with the first spline groove 2. An installation area is provided between each pair of adjacent drive zones, and the outer diameter of the installation area is smaller than the outer diameter of the drive zone. The width of the opening is greater than the outer diameter of the installation area and less than the outer diameter of the drive zone.

[0017] Vertical grooves 22 are provided on both inner walls of the opening, and slots 23 are provided at both the upper and lower ends of the grooves 22; sliding strips 24 that cooperate with the grooves 22 are provided on both sides of the positioning block 6, and locking blocks 25 that cooperate with the slots 23 are provided at both ends of each sliding strip 24; an installation channel 10 is provided through the middle of the drive shaft 1 along the axis of the drive shaft 1, and two symmetrically arranged semi-circular first positioning channels 11 are provided on the inner wall of the installation channel 10; the installation channel 10 is filled with a high manganese steel core 12, and two symmetrically distributed semi-circular second positioning channels 13 are provided on the outer surface of the high manganese steel core 12; a limiting member 14 is installed between the first positioning channel 11 and the second positioning channel 13, and a rubber buffer sleeve 15 is covered on the surface of the limiting member 14; the outer diameter of the rubber buffer sleeve 15 is the same as the sum of the radii of the first positioning channel 11 and the second positioning channel 13; the drive shaft 1 is filled with a high manganese steel core 12, and two symmetrically arranged ... inner surface of the high manganese steel core 12; the drive shaft 1 is filled with a high manganese steel core 12, and two symmetrically arranged semi-circular second A lubricating oil passage 16 is provided along the axial direction, and an oil outlet channel 17 is provided on the lubricating oil passage 16 at the position corresponding to both sides of each main cam block 4; the end face of each oil outlet channel 17 is provided on the outer surface of the transmission area; the lubricating oil passage 16 is provided on one side of the installation channel 10; the outer surfaces of the main cam block 4 and the positioning block 6 are coated with an alloy coating 18, the thickness of which is 0.1mm to 0.3mm; a first limiting member 8 is fixedly installed on the transmission area at the position corresponding to one side of the main cam block 4, and a second limiting member 9 is threadedly installed on the transmission area at the position corresponding to the other side of the main cam block 4; the end faces of the second limiting member 9 and the first limiting member 8 are both located below the end face of the main cam block 4; an oil slinger 19 is fixedly installed on the installation area, and an annular oil groove 20 is provided in the middle of the outer surface of the oil slinger 19; two symmetrically arranged transverse oil slingers 21 connected to the oil groove 20 are provided at the middle end of the oil groove 20.

[0018] Working principle: During operation, the high-manganese steel core 12, the limiting component 14, and the rubber buffer sleeve 15 covering the surface of the limiting component 14 are installed in the middle of the drive shaft 1. Utilizing the high toughness and strength of the high-manganese steel core 12, the strength and toughness of the entire drive shaft 1 are improved. Furthermore, the multiple installation and transmission areas with different diameters on the drive shaft 1 can, to a certain extent, prevent stress concentration, ensuring that the entire drive shaft 1 is not prone to bending or breakage, thus improving its fracture resistance and enhancing safety. The setting of the limiting component 14, and the friction between the surface of the rubber buffer sleeve 15 and the inner walls of the first positioning channel 11 and the second positioning channel 13, ensure the stable installation of the high-manganese steel core 12. Within the drive shaft 1, structural stability is ensured; simultaneously, the rubber buffer sleeve 15 creates a certain buffering effect inside the drive shaft 1, thus weakening external impact forces transmitted to the interior and improving the overall rotational stability of the drive shaft 1; the first spline groove 2 and the second spline 7 cooperate to ensure that the main cam block 4 can be stably mounted on the drive shaft 1, and the positioning block 6 is slidably mounted on the opening of the main cam block 4 through the slide bar 24 and the slide groove 22, and is stably mounted on the main cam block 4 through the slot 23 and the locking block 25, thus ensuring that the main cam block 4 not only forms a complete eccentric cam block, but is also more stably mounted on the drive shaft 1; at the same time, the positioning block 6 Furthermore, the first spline 3 and the second spline groove 5 are stably installed on the drive shaft 1, further enhancing the limiting effect of the main cam block 4 on the drive shaft 1. Combined with the first limiting member 8 and the second limiting member 9 on both sides, the positions of the main cam block 4 and the positioning block 6 will not shift even after prolonged use, ensuring stable braking performance and safety. When a damaged main cam block 4 needs to be replaced, simply rotate the second limiting member 9 outwards to move it from the transmission area to the installation area; then pull the positioning block 6 outwards to separate the second spline 7 on the positioning block 6 from the first spline groove 2, and the locking block 25 on the slide bar 24 from the locking groove 23, thus allowing the positioning block 6 to... The slide bar 24 can slide within the slide groove 22, thus quickly and stably separating from the main cam block 4; finally, the main cam block 4 is pushed towards the second limiting member 9, causing the second spline groove 5 on the main cam block 4 to separate from the first spline 3, and finally the main cam block 4 is moved from the transmission area to the installation area. Because the diameter of the installation area is smaller than the width of the opening on the main cam block 4, the damaged main cam block 4 can be removed from the installation area of ​​the transmission shaft 1 for replacement. The entire maintenance process is convenient and simple to operate. At the same time, during use, lubricating oil can be introduced into the lubrication oil passage 16, so that when the transmission shaft 1 rotates, the lubricating oil in the lubrication oil passage 16 will flow along the oil outlet channel 17 to the transmission area, and then flow to the main cam block 4 for lubrication.Simultaneously, lubricating oil can be added externally to the oil groove 20 on the oil slinger 19. During rotation, the lubricating oil flows within the oil groove 20 and is then flung to both sides through the transverse oil slinger 21, thus completing the lubrication of the main cam blocks 4 on both sides.

Claims

1. A high-safety automotive brake camshaft, characterized in that: The system includes a drive shaft (1) with multiple uniformly distributed drive zones. Each drive zone has a first spline groove (2) in the middle and multiple annularly distributed first splines (3) on both sides of each first spline groove (2). Each drive zone is equipped with a main cam block (4), and each main cam block (4) has a second spline groove (5) that mates with each first spline (3) at the position corresponding to each first spline (3). The main cam block (4) has an opening at the position corresponding to the first spline groove (2), and a positioning block (6) is slidably installed on the opening. The bottom surface of the positioning block (6) has a second spline (7) that mates with the first spline groove (2). An installation area is provided between each two adjacent drive zones, and the outer diameter of the installation area is smaller than the outer diameter of the drive zone. The width of the opening is greater than the outer diameter of the installation area and less than the outer diameter of the drive zone.

2. The high-safety automotive brake camshaft according to claim 1, characterized in that: Vertical grooves (22) are provided on both inner walls of the opening, and slots (23) are provided at both the upper and lower ends of the grooves (22); sliding strips (24) that cooperate with the grooves (22) are provided on both sides of the positioning block (6), and a locking block (25) that cooperates with the slots (23) is provided on both ends of the side of each sliding strip (24).

3. The high-safety automotive brake camshaft according to claim 1, characterized in that: The drive shaft (1) has an installation channel (10) running through its middle section along its axis. The inner wall of the installation channel (10) has two symmetrically arranged semi-circular first positioning channels (11). The installation channel (10) is filled with a high manganese steel core (12). The outer surface of the high manganese steel core (12) has two symmetrically distributed semi-circular second positioning channels (13). A limiting member (14) is installed between the first positioning channel (11) and the second positioning channel (13). The surface of the limiting member (14) is covered with a rubber buffer sleeve (15). The outer diameter of the rubber buffer sleeve (15) is the same as the sum of the radius of the first positioning channel (11) and the radius of the second positioning channel (13).

4. A high-safety automotive brake camshaft according to claim 3, characterized in that: The transmission shaft (1) has a lubricating oil passage (16) along the axial direction. The lubricating oil passage (16) is provided with an oil outlet channel (17) at the position corresponding to both sides of each main cam block (4). The end face of each oil outlet channel (17) is provided on the outer surface of the transmission area. The lubricating oil passage (16) is provided on one side of the installation channel (10).

5. A high-safety automotive brake camshaft according to claim 1, characterized in that: The outer surfaces of the main cam block (4) and the positioning block (6) are coated with an alloy coating (18), the thickness of which is 0.1 mm to 0.3 mm.

6. A high-safety automotive brake camshaft according to claim 1, characterized in that: A first limiting member (8) is fixedly installed on the transmission area at a position corresponding to one side of the main cam block (4), and a second limiting member (9) is threadedly installed on the transmission area at a position corresponding to the other side of the main cam block (4); the end faces of the second limiting member (9) and the first limiting member (8) are both located below the end face of the main cam block (4).

7. A high-safety automotive brake camshaft according to any one of claims 1 to 6, characterized in that: An oil slinger (19) is fixedly installed on the installation area. An annular oil groove (20) is provided in the middle of the outer surface of the oil slinger (19). Two symmetrically arranged transverse oil slingers (21) are opened at the middle end of the oil groove (20) and are connected to the oil groove (20).

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