Roller drive mechanism for engine fuel pump

Abstract

The present invention discloses a roller transmission mechanism for an engine fuel supply pump, the roller transmission mechanism comprising a roller, a roller body, a limit seat, a cushion block and a plunger; the beneficial technical effect of the present invention is: a roller transmission mechanism for an engine fuel supply pump is proposed, the roller transmission mechanism can bear a greater load, so that the reliability of the engine fuel supply pump working under high load and high speed is improved.

Description

Technical Field

[0001] The invention relates to an engine oil supply technology, in particular to a roller transmission mechanism for an engine oil supply pump. Background Art

[0002] The roller transmission mechanism is an important component of the engine fuel supply pump. The function of the roller transmission mechanism is to convert the rotational motion of the camshaft into the up and down reciprocating motion of the plunger pair. Most of the existing roller transmission mechanisms fix the roller on the roller body through the roller pin. When working, the roller rotates around the roller pin, and the inner circle of the roller and the outer circle of the roller pin are in cylindrical contact, and there is surface friction between the two. Obviously, under heavy load, the inner circle of the roller and the outer circle of the roller pin are easily worn. Once the wear is serious, it will cause damage or failure of the roller body assembly, which will directly cause the plunger pair to not work normally, causing the entire fuel supply pump to fail. Summary of the invention

[0003] In view of the problems in the background technology, the present invention proposes a roller transmission mechanism for an engine fuel supply pump, the innovation of which is that the roller transmission mechanism is composed of a roller, a roller body, a limit seat, a cushion block and a plunger;

[0004] The roller is a cylindrical structure;

[0005] The circumferential outer wall of the roller body is a cylindrical surface; a cylindrical groove is provided on the upper end surface of the roller body, and the cylindrical groove is coaxial with the roller body; a pad mounting groove is provided in the middle of the bottom surface of the cylindrical groove; two rectangular planes are milled on the outer wall of the lower part of the roller body, the rectangular planes are parallel to the axial direction of the roller body, and the upper ends of the rectangular planes are located on the upper side of the bottom surface of the cylindrical groove; the lower ends of the rectangular planes are connected to the lower end surface of the roller body, and the two rectangular planes are symmetrically distributed along the circumference of the roller body, the spacing between the two rectangular planes matches the axial length of the roller, and the spacing between the two rectangular planes is smaller than the diameter of the cylindrical groove; a mounting groove with a semicircular cross-section is provided on the lower end surface of the roller body, the contour of the mounting groove matches the contour of the roller, the axial direction of the mounting groove is perpendicular to the rectangular plane, and the mounting groove is located within the range of the rectangular plane;

[0006] An annular groove is arranged on the outer wall of the lower part of the plunger, the structure on the lower side of the annular groove on the plunger forms a limit head, and the structure on the upper side of the annular groove on the plunger forms a guide section;

[0007] The upper end surface of the limit seat body is provided with an outwardly convex connecting platform, and a receiving cavity connected with the lower end surface of the limit seat body is provided in the connecting platform. A notch is provided on the side wall of the connecting platform, and the notch extends to the middle part of the upper end surface of the connecting platform to form a limiting groove; the limit head can enter the receiving cavity through the notch, and when the annular groove is sleeved in the limiting groove, the limit head can be clamped at the lower side of the limiting groove; two limit blocks are provided on the lower end surface of the limit seat body, and the two limit blocks are respectively located on both sides of the connecting platform and are symmetrically positioned;

[0008] The pad block is placed in the pad block mounting groove, and the lower end face of the limit head contacts the upper end face of the pad block; the limit seat is inserted in the roller body, the annular groove on the plunger is sleeved in the limit groove, the lower end face of the limit seat body contacts the bottom face of the cylindrical groove, the inner wall of the limit block contacts the rectangular plane, the two limit blocks correspond to the two rectangular planes respectively, and the limit blocks partially block the axial end face of the mounting groove, the space enclosed by the limit block and the mounting groove forms a limit cavity, and the roller is arranged in the limit cavity; the roller surface is provided with a DLC coating, and the mounting groove surface is provided with a DLC coating.

[0009] After adopting the above-mentioned scheme, the roller transmission mechanism no longer has a roller pin, the structural complexity is significantly reduced, and the contact surface of the roller and the mounting groove is provided with a DLC coating. The DLC coating can effectively reduce the friction coefficient, so that the entire structure can withstand a greater load, thereby enhancing the reliability of the engine fuel pump working under high load and high speed.

[0010] Preferably, the end surface of the roller is a spherical surface. Providing a spherical surface can effectively reduce the contact area between the roller and the limit block, and reduce the rotation resistance of the roller.

[0011] The beneficial technical effect of the present invention is that a roller transmission mechanism for an engine fuel supply pump is proposed, and the roller transmission mechanism can bear a larger load, so that the reliability of the engine fuel supply pump working under high load and high speed is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 , an exploded view of the present invention;

[0013] Figure 2 , a schematic diagram of the cross-sectional structure of the present invention;

[0014] Figure 3 , schematic diagram of the limit seat structure;

[0015] Figure 4 , a schematic diagram of the use state of the present invention;

[0016] The names corresponding to the various marks in the figure are: roller 1, roller body 2, cylindrical groove 21, rectangular plane 22, mounting groove 23, limit seat 3, connecting platform 31, limit groove 32, limit block 33, cushion block 4, plunger 5, cam 6. DETAILED DESCRIPTION

[0017] A roller transmission mechanism for an engine fuel supply pump, the innovation of which is that the roller transmission mechanism is composed of a roller 1, a roller body 2, a limit seat 3, a cushion block 4 and a plunger 5;

[0018] The roller 1 is a cylindrical structure;

[0019] The circumferential outer wall of the roller body 2 is a cylindrical surface; a cylindrical groove 21 is provided on the upper end surface of the roller body 2, and the cylindrical groove 21 is coaxial with the roller body 2; a pad mounting groove is provided in the middle of the bottom surface of the cylindrical groove 21; two rectangular planes 22 are milled on the outer wall of the lower part of the roller body 2, and the rectangular planes 22 are parallel to the axial direction of the roller body 2, and the upper end of the rectangular planes 22 is located on the upper side of the bottom surface of the cylindrical groove 21; the lower end of the rectangular plane 22 is connected with the lower end surface of the roller body 2, and the two rectangular planes 22 are symmetrically distributed along the circumference of the roller body 2, and the spacing between the two rectangular planes 22 matches the axial length of the roller 1, and the spacing between the two rectangular planes 22 is smaller than the diameter of the cylindrical groove 21; a mounting groove 23 with a semicircular cross-section is provided on the lower end surface of the roller body 2, and the contour of the mounting groove 23 matches the contour of the roller 1, and the axial direction of the mounting groove 23 is perpendicular to the rectangular plane 22, and the mounting groove 23 is located within the range of the rectangular plane 22;

[0020] The outer wall of the lower part of the plunger 5 is provided with an annular groove, the structure on the lower side of the annular groove of the plunger 5 forms a limit head, and the structure on the upper side of the annular groove of the plunger 5 forms a guide section;

[0021] The upper end surface of the limit seat 3 body is provided with an outwardly convex connecting platform 31, and a receiving cavity connected with the lower end surface of the limit seat 3 body is provided in the connecting platform 31. A notch is provided on the side wall of the connecting platform 31, and the notch extends to the middle part of the upper end surface of the connecting platform 31 and forms a limiting groove 32; the limiting head can enter the receiving cavity through the notch, and when the annular groove is sleeved in the limiting groove 32, the limiting head can be clamped at the lower side of the limiting groove 32; two limiting blocks 33 are provided on the lower end surface of the limit seat 3 body, and the two limiting blocks 33 are respectively located on both sides of the connecting platform 31 and are symmetrically positioned;

[0022] The pad 4 is placed in the pad mounting groove, and the lower end face of the limit head contacts the upper end face of the pad 4; the limit seat 3 is inserted in the roller body 2, and the annular groove on the plunger 5 is sleeved in the limit groove 32. The lower end face of the limit seat 3 body contacts the bottom face of the cylindrical groove 21, and the inner wall of the limit block 33 contacts the rectangular plane 22. The two limit blocks 33 correspond to the two rectangular planes 22 respectively, and the limit blocks 33 partially block the axial end face of the mounting groove 23. The space enclosed by the limit blocks 33 and the mounting groove 23 forms a limit cavity, and the roller 1 is arranged in the limit cavity; the surface of the roller 1 is provided with a DLC coating, and the surface of the mounting groove 23 is provided with a DLC coating.

[0023] Furthermore, the end surface of the roller 1 is a spherical surface.

Claims

1. A roller transmission mechanism for an engine fuel pump, characterized in that: The roller transmission mechanism is composed of a roller (1), a roller body (2), a limit seat (3), a cushion block (4) and a plunger (5); The roller (1) is a cylindrical structure; The circumferential outer wall of the roller body (2) is a cylindrical surface; the upper end surface of the roller body (2) is provided with a cylindrical groove (21), and the cylindrical groove (21) is coaxial with the roller body (2); a pad mounting groove is provided in the middle of the bottom surface of the cylindrical groove (21); two rectangular planes (22) are milled on the lower outer wall of the roller body (2), the rectangular planes (22) are parallel to the axis of the roller body (2), and the upper ends of the rectangular planes (22) are located on the upper side of the bottom surface of the cylindrical groove (21); the lower ends of the rectangular planes (22) are connected to the lower end surface of the roller body (2), and the Two rectangular planes (22) are symmetrically distributed along the circumference of the roller body (2), the spacing between the two rectangular planes (22) matches the axial length of the roller (1), and the spacing between the two rectangular planes (22) is smaller than the diameter of the cylindrical groove (21); a mounting groove (23) with a semicircular cross section is provided on the lower end surface of the roller body (2), the profile of the mounting groove (23) matches the profile of the roller (1), the axial direction of the mounting groove (23) is perpendicular to the rectangular plane (22), and the mounting groove (23) is located within the range of the rectangular plane (22); An annular groove is provided on the outer wall of the lower part of the plunger (5); the structure below the annular groove on the plunger (5) forms a limit head, and the structure above the annular groove on the plunger (5) forms a guide section; An outwardly convex connecting platform (31) is arranged on the upper end surface of the limiting seat (3) body, and an accommodating cavity connected with the lower end surface of the limiting seat (3) body is arranged in the connecting platform (31), and a notch is arranged on the side wall of the connecting platform (31), and the notch extends to the middle of the upper end surface of the connecting platform (31) and forms a limiting groove (32); the limiting head can enter the accommodating cavity through the notch, and when the annular groove is sleeved in the limiting groove (32), the limiting head can be clamped on the lower side of the limiting groove (32); two limiting blocks (33) are arranged on the lower end surface of the limiting seat (3) body, and the two limiting blocks (33) are respectively located on both sides of the connecting platform (31) and are symmetrically positioned; The pad (4) is placed in the pad installation groove, and the lower end surface of the limit head contacts the upper end surface of the pad (4); the limit seat (3) is inserted into the roller body (2), the annular groove on the plunger (5) is sleeved in the limit groove (32), the lower end surface of the limit seat (3) body contacts the bottom surface of the cylindrical groove (21), the inner wall of the limit block (33) contacts the rectangular plane (22), the two limit blocks (33) correspond to the two rectangular planes (22) respectively, and the limit blocks (33) partially block the axial end surface of the installation groove (23), the space enclosed by the limit blocks (33) and the installation groove (23) forms a limit cavity, and the roller (1) is arranged in the limit cavity; the surface of the roller (1) is provided with a DLC coating, and the surface of the installation groove (23) is provided with a DLC coating.

2. The roller transmission mechanism for an engine fuel supply pump according to claim 1, characterized in that: The end surface of the roller (1) is a spherical surface.

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