Timing cog belt system of engine

Abstract

The utility model discloses a timing cog belt system of an engine, which relates to the technical field of engines and comprises a cam shaft cog wheel, a fuel injection pump cog wheel, a tensioning wheel and a cog belt, and both the cam shaft cog wheel and the fuel injection pump cog wheel are provided with kidney-shaped grooves; the timing cog belt system of the engine further comprises more than two rotation stopping bolts, and one end of each rotation stopping bolt is matched with a kidney-shaped groove in the cam shaft cog wheel and a kidney-shaped groove in the fuel injection pump cog wheel. The cam shaft tooth-shaped wheel and the fuel injection pump tooth-shaped wheel are both provided with the kidney-shaped grooves, so that the tensioner can rotate in a small range before a tensioner mounting bolt is tightened; when an operator installs the cog belt, normal installation of the cog belt is not affected by large rotation of the cam shaft cog wheel and the fuel injection pump cog wheel. When the tensioner is tensioned, the cog belt is stressed, and the cam shaft cog wheel and the fuel injection pump cog wheel rotate slightly after being stressed by the cog belt, so that the stress of each section of the cog belt is uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine timing toothed belt system. Background Art

[0002] With the continuous development of the engine industry and users' increasing demands for vehicle driving comfort, more and more engine timing systems are choosing toothed belt drives. However, the installation method of the timing belt is different from that of the gear drive. During installation, the camshaft gear and the injection pump gear are prone to large rotation, which affects the installation efficiency of the toothed belt. In addition, the actual installation process is prone to uneven force on the toothed belt, which affects the transmission performance of the toothed belt and fails to realize the advantages of belt drive. Summary of the Invention

[0003] The purpose of the utility model is to provide an engine timing toothed belt system to solve the above-mentioned deficiencies in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an engine timing toothed belt system, comprising a camshaft toothed wheel, an injection pump toothed wheel, a tensioning wheel and a toothed belt, wherein the camshaft toothed wheel and the injection pump toothed wheel are both provided with waist-shaped grooves; the engine timing toothed belt system also includes two or more anti-rotation pins, one end of the anti-rotation pins is adapted to the waist-shaped grooves on the camshaft toothed wheel and the injection pump toothed wheel; positioning holes adapted to the anti-rotation pins are both provided on the engine cylinder head and the injection pump bracket.

[0005] Preferably, the invention further comprises a flywheel, on which a positioning groove cooperating with the anti-rotation latch is provided.

[0006] Preferably, the anti-rotation latch includes a hand-held section located in the middle, a first plug-in section located at one end of the hand-held section, and a second plug-in section located at the other end of the hand-held section.

[0007] Preferably, the first plug-in section is threadedly matched with one end of the hand-held section, and the second plug-in section is threadedly matched with the other end of the hand-held section.

[0008] Preferably, the first plug-in section and the second plug-in section are both fixedly installed with a connecting rod at one end that cooperates with the hand-held section, and a locking block is fixedly installed at one end of the connecting rod. A sliding groove that cooperates with the locking block is provided at the end of the hand-held section, and a receiving groove is symmetrically provided on the inner wall of the sliding groove. A card block is slidably installed in the receiving groove, and an elastic member is connected between the card block and the receiving groove.

[0009] Preferably, the longitudinal cross-section of the locking block is elliptical, the long axis of the locking block away from the hand-held section is shorter than the long axis of the locking block close to the hand-held section, the slide groove is circular and the diameter of the slide groove is equal to the long axis of the locking block close to the hand-held section; wings are fixedly installed on the first plug-in section and the second plug-in section, a support plate is fixedly installed on the end surface of the hand-held section, and a metal spring is fixedly installed on the wing.

[0010] In the above technical solution, the utility model provides an engine timing toothed belt system, in which waist-shaped grooves are provided on the camshaft toothed wheel and the fuel injection pump toothed wheel, which can be rotated slightly before the tensioner mounting bolts are tightened; in this way, when the operator installs the toothed belt, the normal installation of the toothed belt will not be affected by the large rotation of the camshaft toothed wheel and the fuel injection pump toothed wheel; and when the tensioner is tensioned, the toothed belt will be subjected to force, and the camshaft toothed wheel and the fuel injection pump toothed wheel will rotate slightly after being subjected to the toothed belt force, so as to ensure that the force on each section of the toothed belt is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0012] Figure 1 Schematic diagram of the three-dimensional structure of the engine timing belt system in Example 1;

[0013] Figure 2 It is a front view of the engine timing belt system in Example 1;

[0014] Figure 3 Schematic diagram of the three-dimensional structure of the anti-rotation latch in the embodiment;

[0015] Figure 4 This is a schematic diagram of the partial structure inside the stop-rotation latch of Example 2;

[0016] Figure 5 for Figure 4 Left view of section aa;

[0017] Figure 6 This is a schematic diagram of the partial three-dimensional structure of the stop pin in Example 2.

[0018] Description of reference numerals:

[0019] 1. Camshaft gear; 2. Fuel injection pump gear; 3. Tensioner; 4. Toothed belt; 5. Anti-rotation latch; 501. Hand-held section; 502. First plug-in section; 503. Second plug-in section; 504. Connecting rod; 505. Locking block; 506. Slide; 507. Accommodating groove; 508. Block; 509. Elastic member; 510. Wing; 511. Support plate; 512. Metal shrapnel; 6. Flywheel. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Example 1

[0022] like Figure 1 and Figure 2 As shown, this embodiment provides an engine timing toothed belt system, including a camshaft toothed wheel 1, an injection pump toothed wheel 2, a tensioning wheel 3 and a toothed belt 4, and the camshaft toothed wheel 1 and the injection pump toothed wheel 2 are both provided with waist-shaped grooves; the engine timing toothed belt system also includes more than two anti-rotation pins 5, one end of the anti-rotation pin 5 is adapted to the waist-shaped grooves on the camshaft toothed wheel 1 and the injection pump toothed wheel 2; positioning holes adapted to the anti-rotation pin 5 are provided on the engine cylinder head and the injection pump bracket; the engine timing toothed belt system of this embodiment also includes a flywheel 6, and the flywheel 6 is provided with a positioning groove that cooperates with the anti-rotation pin 5.

[0023] Specifically, first install the crankshaft gear, camshaft gear 1 and fuel injection pump gear 2 to the predetermined positions, tighten the crankshaft gear mounting bolts, and do not tighten the camshaft gear 1 and fuel injection pump gear 2 mounting bolts to ensure that the camshaft gear 1 and fuel injection pump gear 2 can rotate freely, then use the anti-rotation pin 5 to pass through the waist grooves on the camshaft gear 1 and fuel injection pump gear 2 respectively, and insert them into the corresponding positioning holes on the engine cylinder head and fuel injection pump bracket; then install the toothed belt 4 from the crankshaft gear Wind the gear wheel position in a counterclockwise direction; install the timing tensioner, but the tensioner mounting bolt flange cannot press on the tensioner to ensure that the tensioner is in a relaxed state; then install the contact idler and tighten the contact idler bolts as required; use an Allen wrench to turn the tensioner adjustment block clockwise so that the tensioner adjustment block pointer coincides with the slot on the base, then tighten the tensioner mounting bolts first, then tighten the camshaft gear 1 and injection pump gear 2 mounting bolts, and finally remove all anti-rotation pins 5.

[0024] It should be noted that in this embodiment, the waist grooves on the camshaft gear 1 and the fuel injection pump gear 2 are arc-shaped, and the virtual center of the waist groove coincides with the center of the corresponding camshaft gear 1 or fuel injection pump gear 2. Before the tensioner mounting bolts are tightened, the camshaft gear 1 and the fuel injection pump gear 2 can rotate. When the tensioner is tightened, the toothed belt 4 is subjected to force. The camshaft gear 1 and the fuel injection pump gear 2 rotate slightly after receiving the force from the toothed belt 4 to ensure uniform force at all points on the toothed belt 4. Due to the restriction of the anti-rotation pin 5, the front camshaft gear 1 and the fuel injection pump gear 2 will not rotate significantly when the operator installs the toothed belt 4, thereby improving the operator's efficiency in installing the toothed belt 4.

[0025] like Figure 3 As shown, the anti-rotation pin 5 includes a hand-held section 501 located in the middle, a first plug-in section 502 located at one end of the hand-held section 501, and a second plug-in section 503 located at the other end of the hand-held section 501; the first plug-in section 502 is compatible with the positioning hole on the engine cylinder head, and when assembled, the first plug-in section 502 passes through the waist-shaped groove on the camshaft gear 1 and is inserted into the positioning hole on the engine cylinder head; the second plug-in section 503 is compatible with the positioning hole on the fuel injection pump bracket, and when assembled, the second plug-in section 503 passes through the waist-shaped groove on the fuel injection pump gear 2 and is inserted into the positioning hole on the fuel injection pump bracket; the first plug-in section 502 is threadedly matched with one end of the hand-held section 501, and the second plug-in section 503 is threadedly matched with the other end of the hand-held section 501.

[0026] Example 2

[0027] The difference between this embodiment and the previous embodiment is that the first plug-in section 502 and the hand-held section 501 are not threaded together, and the second plug-in section 503 and the hand-held section 501 are not threaded together; Figure 4 and Figure 5 As shown, the first plug-in section 502 and the second plug-in section 503 are fixedly installed with a connecting rod 504 at one end of the hand-held section 501, and a locking block 505 is fixedly installed at one end of the connecting rod 504. The longitudinal section of the locking block 505 is elliptical, and the long axis of the end of the locking block 505 away from the hand-held section 501 is shorter than the long axis of the end of the locking block 505 close to the hand-held section 501. The long axis of the locking block 505 transitions smoothly from one end to the other end; the end of the hand-held section 501 is provided with a locking block 505. The block 505 cooperates with the slide groove 506, which is circular and has a diameter equal to the long axis of the end of the locking block 505 close to the hand-held section 501; a receiving groove 507 is symmetrically opened on the inner wall of the slide groove 506, and a clamping block 508 is slidably installed in the receiving groove 507, and the end of the clamping block 508 facing the center of the slide groove 506 is an arc surface, and the end of the clamping block 508 facing the end face of the slide groove 506 is a flat surface; an elastic member 509 is connected between the clamping block 508 and the receiving groove 507.

[0028] Specifically, during use, the operator holds the hand-held section 501 in one hand and the first plug-in section 502 or the second plug-in section 503 in the other hand, and inserts the locking block 505 into the corresponding slide groove 506. During the insertion process, the arc surface of the locking block 505 fits with the arc surface of the card block 508, and the locking block 505 pushes the card block 508 to move into the accommodating groove 507. The elastic member 509 is compressed. As the locking block 505 continues to move into the slide groove 506, the arc surface of the locking block 505 separates from the arc surface of the card block 508, and the small end surface of the locking block 505 also fits with the end surface of the slide groove 506. The elastic member 509 recovers and pushes the card block 508 to reset. The card block 508 plays a limiting role on the locking block 505, and the locking block 505 remains stationary relative to the slide groove 506. In this way, the operator completes the splicing of the anti-rotation latch 5. When the first plug-in section 502 or the second plug-in section 503 is damaged, the operator only needs to rotate the first plug-in section 502 or the second plug-in section 503 so that the locking block 505 rotates 90 degrees, that is, the position of the locking block 505 and the locking block 508 are offset, and the first plug-in section 502 or the second plug-in section 503 can be directly pulled out of the slide 506, which is convenient for operation. Compared with threaded engagement, this structure in this embodiment is more convenient to operate, and even if the first plug-in section 502 or the second plug-in section 503 is deformed by external force during use, it will not affect the operator's removal from the handheld section 501.

[0029] like Figure 6 As shown, two fins 510 are fixedly mounted on each of the first plug-in section 502 and the second plug-in section 503, and two supporting pieces 511 are fixedly mounted on the end surface of the handheld section 501. An arc-shaped metal spring piece 512 is fixedly mounted on the fins 510. During the installation of the first plug-in section 502 and the second plug-in section 503, the operator only needs to align the fins 510 with the gaps between the two supporting pieces 511 and then insert the fins. This ensures that the locking block 505 is inserted into the slide 506 at a predetermined position, thereby ensuring that the clamping block 508 can limit the locking block 505. After the locking block 505 is inserted into place, the fins 510 fit into the corresponding ends of the metal spring piece 512. The metal spring piece 512 limits the fins 510 to a certain extent, preventing the first plug-in section 502 and the second plug-in section 503 from rotating relative to the handheld section 501 during use, thereby ensuring the stability of the clamping block 508 limiting the locking block 505. When the first plug-in section 502 and the second plug-in section 503 need to be disassembled, the operator only needs to rotate the first plug-in section 502 and the second plug-in section 503 to overcome the supporting force of the metal spring piece 512, causing the metal spring piece 512 to deform to a certain extent, and then pull out the first plug-in section 502 and the second plug-in section 503.

[0030] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An engine timing toothed belt system, comprising a camshaft toothed wheel (1), an injection pump toothed wheel (2), a tensioning wheel (3) and a toothed belt (4), characterized in that: The camshaft gear wheel (1) and the fuel injection pump gear wheel (2) are both provided with waist-shaped grooves; the engine timing toothed belt system further comprises two or more anti-rotation latches (5), one end of the anti-rotation latches (5) being adapted to the waist-shaped grooves on the camshaft gear wheel (1) and the fuel injection pump gear wheel (2); and positioning holes adapted to the anti-rotation latches (5) are both provided on the engine cylinder head and the fuel injection pump bracket.

2. The engine timing belt system according to claim 1, characterized in that: The invention also comprises a flywheel (6), on which a positioning groove cooperating with the anti-rotation latch (5) is provided.

3. The engine timing belt system according to claim 1, characterized in that: The anti-rotation latch (5) comprises a hand-held section (501) located in the middle, a first plug-in section (502) located at one end of the hand-held section (501), and a second plug-in section (503) located at the other end of the hand-held section (501).

4. The engine timing belt system according to claim 3, characterized in that: The first plug-in section (502) is threadedly engaged with one end of the hand-held section (501), and the second plug-in section (503) is threadedly engaged with the other end of the hand-held section (501).

5. The engine timing belt system according to claim 3, characterized in that: The first plug-in section (502) and the second plug-in section (503) are both fixedly mounted with a connecting rod (504) at one end that cooperates with the hand-held section (501), a locking block (505) is fixedly mounted at one end of the connecting rod (504), a sliding groove (506) that cooperates with the locking block (505) is provided at the end of the hand-held section (501), and a receiving groove (507) is symmetrically provided on the inner wall of the sliding groove (506), a clamping block (508) is slidably mounted in the receiving groove (507), and an elastic member (509) is connected between the clamping block (508) and the receiving groove (507).

6. The engine timing belt system according to claim 5, characterized in that: The longitudinal section of the locking block (505) is elliptical, the long axis of the end of the locking block (505) away from the handheld section (501) is shorter than the long axis of the end of the locking block (505) close to the handheld section (501), the sliding groove (506) is circular, and the diameter of the sliding groove (506) is equal to the long axis of the end of the locking block (505) close to the handheld section (501); the first plug section (502) and the second plug section (503) are both fixedly mounted with a wing (510), the end surface of the handheld section (501) is fixedly mounted with a support plate (511), and the wing (510) is fixedly mounted with a metal spring (512).

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