Heavy truck brake camshaft

Abstract

The utility model relates to the technical field of brake cam shafts, and discloses a heavy truck brake cam shaft which comprises a shaft core, a cam body is arranged outside the shaft core in a sleeved mode, positioning holes are formed in the two sides of the cam body in a penetrating mode, and protective sleeves are arranged at the two ends of the cam body in a sleeved mode. Guide sliding grooves are formed in the inner walls, close to the end face of the cam body, in the protective sleeves. The two ends of the cam body are wrapped and protected under the action of the protective sleeve, direct collision between the protective sleeve and the cam body is reduced under the action of the buffer strip, and therefore when the cam shaft operates, collision borne by the abutting side, making contact with a brake shoe block, of the cam body is weakened, and the service life of the cam shaft is prolonged. And by means of the detachability of the protective sleeve, the protective sleeve can be conveniently and independently replaced, and the situation that the whole cam shaft is overall disassembled and maintained is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of brake camshafts, in particular to a heavy truck brake camshaft. Background Art

[0002] Heavy truck is the abbreviation of heavy truck. In the braking system of heavy truck, camshaft is generally used to control the opening and closing of brake shoes. The rotation of cam makes the outer sides of both ends of cam press against the brake shoes to control the opening and closing of the shoes, so as to achieve contact braking between friction plate and brake drum.

[0003] Chinese patent authorization announcement number CN212959751U discloses a new heavy truck brake camshaft, including a shaft body and a shaft cap, one end of the shaft body is provided with teeth, and the shaft body is provided with two sealing grooves near both ends, and a sealing ring is provided inside the sealing groove, and an oil scraping groove is provided between the two sealing grooves, which is beneficial to buffer the end of the camshaft during the installation of the camshaft, prevent the end of the camshaft from colliding with the installation position, causing defects, and increasing its service life. The above-mentioned prior art solution has the following shortcomings: the camshaft prevents the installation of the camshaft end through the cooperation of the first spring and the second spring to reduce the collision between the end and the installation position, but the structure increases the mobility between the camshaft and the shaft body. Since the camshaft needs to contact the brake shoe during use, the vibration and collision of the camshaft during use are increased, which is easy to affect its service life, so there is a certain room for improvement. Utility Model Content

[0004] The utility model aims to provide a heavy-duty truck brake camshaft to solve the problem in the prior art that it is difficult to protect the cam during use.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heavy-duty truck brake camshaft, comprising an axis core, the outer sleeve of the axis core is provided with a cam body, and positioning holes are penetrated on both sides of the cam body, both ends of the cam body are provided with protective sleeves, and the inner wall of the protective sleeve close to the end face of the cam body is provided with guide grooves, and the inside of the guide grooves is slidably installed with guide rails, one side of the guide rails is connected to the end face of the cam body, a plurality of buffer strips are installed on both sides of the protective sleeve away from the end face of the cam body, grooves are provided on both sides of the protective sleeve, and a fixing mechanism is connected between the grooves and the positioning holes to connect the protective sleeve and the cam body.

[0006] Preferably, the cross-section of the buffer strip is semicircular, the buffer strips are closely distributed at equal intervals on the protective sleeve, and the inner side of the buffer strip abuts against the outer side of the cam body.

[0007] Preferably, the cross section of the groove is an isosceles triangle, the position of the groove corresponds to the position of the positioning hole, and the opening of the groove faces the shaft core.

[0008] Preferably, the two protective sleeves are centrally symmetrical about the shaft core, and the protective sleeves form a sliding structure with the shaft core through the cooperation of the guide rail and the guide groove.

[0009] Preferably, the fixing mechanism includes a positioning rod passing through the positioning hole, and a connecting sleeve is installed at one end of the positioning rod, limiting blocks are installed on both sides of the connecting sleeve, and the inner side of the limiting block is connected to the outer side of the protective sleeve, and a threaded rod is installed at the other end of the positioning rod, and one end of the threaded rod extends to the outside of the positioning hole and is sleeved with a connecting cap, the outside of the connecting cap is sleeved with a fixing block, and the inner side of the fixing block is abutted against the outer side of the protective sleeve.

[0010] Preferably, two limit blocks are provided, and the two limit blocks are respectively located on both sides of the groove on the same side, and the outer sides of the limit blocks are in contact with the inner wall of the connecting sleeve.

[0011] Preferably, the threaded rod is threadedly connected to the connecting cap, and the cross-section of the fixing block is triangular.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) The protective sleeve is used to wrap and protect both ends of the cam body, and the buffer strip is used to reduce the direct collision between the protective sleeve and the cam body, so that when the camshaft is in operation, the impact on the contacting side of the cam body and the brake shoe is weakened, thereby reducing direct damage to the cam body. The detachability of the protective sleeve is used to facilitate the replacement of the protective sleeve alone, avoiding the overall disassembly and maintenance of the entire camshaft;

[0014] (2) The protective sleeve is limited by the cooperation of the guide groove and the guide rail. The protective sleeve is further connected to the cam body by the cooperation of the connecting cap, the limiting block, the positioning rod, etc., and the position of the positioning rod is further fixed by the threaded connection between the connecting cap and the threaded rod, thereby further ensuring the installation reliability of the fixing block. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional three-dimensional structure of the protective cover of the utility model;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the protective cover of the utility model;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the threaded rod distribution of the utility model.

[0020] Explanation of the reference numerals in the figure: 1. shaft core; 2. cam body; 3. positioning hole; 4. positioning rod; 5. guide rail; 6. protective sleeve; 7. buffer strip; 8. fixing block; 9. guide slide groove; 10. groove; 11. limit block; 12. connecting sleeve; 13. threaded rod; 14. connecting cap. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-Figure 4 The utility model provides an embodiment: a heavy truck brake camshaft, comprising a shaft core 1, a cam body 2 is sleeved on the outside of the shaft core 1, and positioning holes 3 are penetrated on both sides of the cam body 2, and protective sleeves 6 are sleeved on both ends of the cam body 2;

[0023] The two protective sleeves 6 are centrally symmetrical about the shaft core 1, and the protective sleeves 6 form a sliding structure with the shaft core 1 through the cooperation of the guide rail 5 and the guide slot 9;

[0024] Specifically, Figure 1 , Figure 2 As shown, when in use, the protective cover 6 is used to protect both ends of the cam body 2, and the detachability of the protective cover 6 is used to reduce the disassembly and maintenance of the cam body 2;

[0025] A guide slot 9 is provided on the inner wall of the protective sleeve 6 near the end face of the cam body 2, and a guide rail 5 is slidably installed inside the guide slot 9, one side of the guide rail 5 is connected to the end face of the cam body 2, and a plurality of buffer strips 7 are installed on both sides of the protective sleeve 6 away from the end face of the cam body 2;

[0026] The cross section of the buffer strip 7 is semicircular, and the buffer strips 7 are closely distributed at equal intervals on the protective sleeve 6, and the inner side of the buffer strip 7 abuts against the outer side of the cam body 2;

[0027] Specifically, Figure 1 , Figure 2 As shown, when in use, the buffer strip 7 is used to isolate the protective sleeve 6 from the cam body 2 and to provide a buffering effect;

[0028] Grooves 10 are provided on both sides of the protective sleeve 6;

[0029] The cross section of the groove 10 is an isosceles triangle, the position of the groove 10 corresponds to the position of the positioning hole 3, and the opening of the groove 10 faces the shaft core 1;

[0030] A fixing mechanism is connected between the groove 10 and the positioning hole 3 to connect the protective sleeve 6 and the cam body 2;

[0031] The fixing mechanism includes a positioning rod 4 that passes through the positioning hole 3, and a connecting sleeve 12 is installed at one end of the positioning rod 4, and both sides of the connecting sleeve 12 are installed with limit blocks 11, and the inner side of the limit block 11 is connected to the outer side of the protective sleeve 6, and a threaded rod 13 is installed at the other end of the positioning rod 4, and one end of the threaded rod 13 extends to the outside of the positioning hole 3 and is sleeved with a connecting cap 14, and the outer side of the connecting cap 14 is sleeved with a fixing block 8, and the inner side of the fixing block 8 is against the outer side of the protective sleeve 6;

[0032] Two limit blocks 11 are provided, and the two limit blocks 11 are respectively located on both sides of the groove 10 on the same side, and the outer side of the limit block 11 is in contact with the inner wall of the connecting sleeve 12;

[0033] The threaded rod 13 is threadedly connected to the connection cap 14, and the cross section of the fixing block 8 is a triangle;

[0034] Specifically, Figure 1 , Figure 3 and Figure 4 As shown, when in use, the limit block 11 and the connecting sleeve 12 are used to cooperate with each other to facilitate the connection between the protective sleeve 6 and the cam body 2, and the connecting cap 14 and the threaded rod 13 are threadedly connected to further fix the protective sleeve 6, and the fixing method is detachable.

[0035] Working principle: When the utility model is used, firstly, two protective sleeves 6 are sleeved on both sides of the cam body 2, and the guide rail 5 slides along the guide slide groove 9, so as to limit the protective sleeve 6, and then the positioning rod 4 is inserted into the positioning hole 3, so that the connecting sleeve 12 wraps the two limiting blocks 11, so as to realize the connection between the positioning rod 4 and the protective sleeve 6 and the cam body 2;

[0036] Secondly, the connecting cap 14 is sleeved on the threaded rod 13, and the connecting cap 14 is rotated by the fixing block 8, so that the fixing block 8 is close to the protective sleeve 6, and the fixing is continuously screwed until the inner side of the fixing block 8 abuts against the outer wall of the protective sleeve 6, thereby fixing the protective sleeve 6 and the cam body 2;

[0037] Finally, the buffer strip 7 is used to isolate the protective sleeve 6 from the cam body 2. When the cam body 2 rotates and moves the brake shoe, the protective sleeve 6 is used to prevent the outer side of the cam body 2 from being directly subjected to force, and the buffer strip 7 is used for buffering to improve the protection of the cam body 2.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A heavy truck brake camshaft, comprising a shaft core (1), characterized in that: The shaft core (1) is sleeved with a cam body (2) on the outside, and positioning holes (3) are penetrated on both sides of the cam body (2), and protective sleeves (6) are sleeved on both ends of the cam body (2), and the inner wall of the protective sleeve (6) close to the end face of the cam body (2) is provided with a guide groove (9), and the guide groove (9) is slidably installed with a guide rail (5), one side of the guide rail (5) is connected to the end face of the cam body (2), and a plurality of buffer strips (7) are installed on both sides of the protective sleeve (6) away from the end face of the cam body (2), and grooves (10) are provided on both sides of the protective sleeve (6), and a fixing mechanism is connected between the groove (10) and the positioning hole (3) to connect the protective sleeve (6) and the cam body (2).

2. A heavy truck brake camshaft according to claim 1, characterized in that: The cross section of the buffer strip (7) is semicircular, and the buffer strips (7) are closely distributed at equal intervals on the protective sleeve (6), and the inner side of the buffer strip (7) abuts against the outer side of the cam body (2).

3. A heavy truck brake camshaft according to claim 1, characterized in that: The cross section of the groove (10) is an isosceles triangle, the position of the groove (10) corresponds to the position of the positioning hole (3), and the opening of the groove (10) faces the shaft core (1).

4. The heavy truck brake camshaft according to claim 1, characterized in that: The two protective sleeves (6) are centrally symmetrical about the shaft core (1), and the protective sleeves (6) form a sliding structure with the shaft core (1) through the cooperation of the guide rail (5) and the guide slide groove (9).

5. The heavy truck brake camshaft according to claim 1, characterized in that: The fixing mechanism comprises a positioning rod (4) penetrating the interior of the positioning hole (3), and a connecting sleeve (12) is installed at one end of the positioning rod (4), and limit blocks (11) are installed on both sides of the interior of the connecting sleeve (12), and the inner side of the limit blocks (11) is connected to the outer side of the protective sleeve (6), and a threaded rod (13) is installed at the other end of the positioning rod (4), and one end of the threaded rod (13) extends to the outside of the positioning hole (3) and is sleeved with a connecting cap (14), and the outer side of the connecting cap (14) is sleeved with a fixing block (8), and the inner side of the fixing block (8) is abutted against the outer side of the protective sleeve (6).

6. A heavy truck brake camshaft according to claim 5, characterized in that: Two limit blocks (11) are provided, and the two limit blocks (11) are respectively located on both sides of the groove (10) on the same side, and the outer side of the limit block (11) is in contact with the inner wall of the connecting sleeve (12).

7. The heavy truck brake camshaft according to claim 5, characterized in that: The threaded rod (13) is threadedly connected to the connecting cap (14), and the cross section of the fixing block (8) is triangular.

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