Pawl driving mechanism for walking mechanism of lawn mower

Abstract

The pawl driving mechanism comprises wheels, an output shaft, a driving gear and a plurality of driving pawls, a round first groove is formed in the center of the rear end face of the driving gear, a plurality of ratchets are arranged on the inner side wall of the first groove at intervals, the driving gear is connected to the arc face of the outer side of the output shaft in a sleeved mode, and the driving pawls are arranged in the first groove. The output shaft is arranged in an inner cavity of the wheel in a penetrating mode, a plurality of long second grooves are formed in the cambered surface of the outer side of the output shaft, the second grooves are used for installing the pawls, the pawls are assembled with the torsional springs and meshed with the ratchets, cylindrical protrusions extending outwards are arranged on the two sides of the bottoms of the pawls, and the cylindrical protrusions are meshed with the ratchets. The spiral parts on the two sides of the torsion spring are connected to the outer side arc face of the cylindrical protrusion in a sleeved mode, the two spiral parts are connected through a U-shaped connecting rod, the two ends of the U-shaped connecting rod are connected with one ends of the spiral parts respectively, and a bottom rod of the U-shaped connecting rod is attached to the pawl.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pawl drive mechanism for lawn mower walking mechanism. BACKGROUND

[0002] The walking of the plant protection machinery self-propelled household machine mainly relies on the contact of the driving sheet on the output shaft of the gearbox with the ratchet wheel in the pinion to drive the meshing rotation of the outer gear of the pinion with the inner gear of the walking wheel to move forward. This structure is mainly composed of a pinion, a single driving sheet and a torsion spring. However, this structure has the defects of great machining difficulty, poor reliability of parts and difficult installation. In addition, the single driving sheet is unevenly stressed and is prone to breakage. The driving mechanism is open, which easily causes the accumulation of dust and grass clippings in the gear groove, causing the driving to be stuck and even damaged. SUMMARY

[0003] The utility model aims at solving the defects of the prior art and provides a pawl drive mechanism for lawn mower walking mechanism.

[0004] A pawl drive mechanism for lawn mower walking mechanism, comprising a wheel, an output shaft, a driving gear and a plurality of driving pawls, wherein the center of the rear end surface of the driving gear is provided with a circular first groove, the inner side wall of the first groove is provided with a plurality of ratchet teeth at intervals, the driving gear is sleeved on the outer side arc surface of the output shaft, the output shaft is arranged in the inner cavity of the wheel, the outer side arc surface of the output shaft is provided with a plurality of long second grooves for mounting the pawls, the pawls are assembled with torsion springs, and the pawls are engaged with the ratchet teeth.

[0005] Further, the bottom of the pawl is provided with outwardly extending cylindrical protrusions, the helical parts on both sides of the torsion spring are sleeved on the outer side arc surface of the cylindrical protrusions, the two helical parts are connected through a U-shaped connecting rod, the two ends of the U-shaped connecting rod are connected with one end of the helical part respectively, and the bottom rod of the U-shaped connecting rod is attached to the pawl.

[0006] Further, the driving gear is a straight gear.

[0007] Further, the output shaft is provided with a first limiting mechanism and a second limiting mechanism on the front side and the rear side of the driving gear respectively.

[0008] Further, the first limiting mechanism comprises a check ring, the outer side arc surface of the output shaft is provided with an annular groove, and the annular groove is provided with an annular check ring.

[0009] Further, the second limiting mechanism comprises a gland, the gland is a plate-shaped mechanism, the center thereof is provided with an internally recessed accommodation groove, one end of the output shaft is inserted into the accommodation groove, the output shaft and the gland are connected through a bolt, and the bolt passes through the gland and the output shaft in sequence.

[0010] Furthermore, a flat washer and a spring washer are provided between the bolt head and the gland surface.

[0011] Beneficial effects: Compared with the prior art, this utility model adopts 3 sets of drive blocks, which makes the force uniform, the transmission smooth and the failure rate low; and the structure is easy to install, rotates flexibly and has no jamming; at the same time, a pressure cover is installed and the internal parts are lubricated in a closed manner to prevent dust, weeds and other debris from entering the cavity and reduce the wear of the parts. Attached Figure Description

[0012] Fig. 1 This is an internal schematic diagram of a pawl drive mechanism used in the walking mechanism of a lawnmower.

[0013] Fig. 2 This is a schematic diagram of the assembly of the drive gear and the ratchet.

[0014] In the diagram, 1 is the wheel, 2 is the drive gear, 3 is the output shaft, 4 is the pawl, 5 is the torsion spring, 6 is the cylindrical protrusion, 7 is the bolt, 8 is the spring washer, 9 is the flat washer, 10 is the pressure cap, 11 is the first groove, and 12 is the ratchet tooth. Detailed Implementation

[0015] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0016] like Figs. 1-2 As shown, wheel 1, drive gear 2, output shaft 3, pawl 4, torsion spring 5, cylindrical protrusion 6, bolt 7, spring washer 8, flat washer 9, pressure cap 10, first groove 11, ratchet 12;

[0017] A ratchet drive mechanism for a lawnmower includes a wheel 1, an output shaft 3, a drive gear 2, and three drive ratchet pawls 4. The drive gear 2 has a circular first groove 11 at the center of its rear end face. The inner sidewall of the first groove 11 is provided with three ratchet teeth 12 spaced apart. The drive gear 2 is sleeved on the outer arc surface of the output shaft 3. The output shaft 3 passes through the inner cavity of the wheel 1. The outer arc surface of the output shaft 3 has three elongated second grooves spaced at equal intervals. The multiple second grooves are used to install the ratchet pawls 4. The ratchet pawls 4 are assembled with a torsion spring 5 and engage with the ratchet teeth 12.

[0018] In this example, the pawl 4 has outwardly extending cylindrical protrusions 6 on both sides of its bottom. The spiral parts on both sides of the torsion spring 5 are sleeved on the outer arc surface of the cylindrical protrusions 6. The two spiral parts are connected by a U-shaped connecting rod. The two ends of the U-shaped connecting rod are respectively connected to one end of the spiral part, and the bottom of the U-shaped connecting rod is in contact with the pawl 4.

[0019] In the present embodiment, the driving gear 2 is a straight gear.

[0020] In the present embodiment, the output shaft 3 is provided with a first limiting mechanism and a second limiting mechanism at the front side and the rear side of the driving gear 2 respectively.

[0021] In the present embodiment, the first limiting mechanism comprises a check ring, and the outer arc surface of the output shaft 3 is provided with an annular groove, and the annular groove is provided with a ring-shaped check ring.

[0022] In the present embodiment, the second limiting mechanism comprises a gland 10, which is a plate-shaped mechanism and is provided with an inner concave accommodation slot at the center, and one end of the output shaft 3 is inserted into the accommodation slot, and the output shaft 3 and the gland 10 are fixedly connected through a bolt 7, and the bolt 7 passes through the gland 10 and the output shaft 3 in sequence.

[0023] In the present embodiment, a flat washer 9 and an elastic washer 8 are arranged between the head of the bolt 7 and the surface of the gland 10.

[0024] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pawl drive mechanism for a walk behind lawn mower, characterized by, The utility model discloses a wheel, output shaft, drive gear, a plurality of drive pawls, the drive gear rear end surface center is equipped with the circular first recess, and the inner side wall of first recess is equipped with a plurality of ratchet tooth at intervals, the drive gear is sleeved on the outside arc surface of output shaft, the output shaft is arranged in the inner chamber of wheel, the outside arc surface of output shaft is equipped with a plurality of long second recesses, and the second recess is used to install pawl, the pawl is assembled with torsion spring, and the pawl is engaged with ratchet tooth.

2. A pawl drive mechanism for a lawn mower travel mechanism according to claim 1 wherein, The bottom of pawl is equipped with the cylindrical convex that extends outward on both sides, and the spiral part of torsion spring is sleeved on the outside arc surface of cylindrical convex on both sides, and the both ends of U-shaped connecting rod are connected with the one end of spiral part respectively, and the bottom rod of U-shaped connecting rod is attached to pawl.

3. A pawl drive mechanism for a lawn mower travel mechanism as set forth in claim 1, wherein The drive gear is a straight gear.

4. A pawl drive mechanism for a lawn mower travel mechanism as defined in claim 1 wherein, The output shaft is equipped with first limiting mechanism and second limiting mechanism respectively on the front side and rear side of drive gear.

5. A pawl drive mechanism for a lawn mower travel mechanism according to claim 4 wherein, The first limiting mechanism includes a check ring, the outside arc surface of output shaft is equipped with annular recess, and the annular recess is equipped with annular check ring.

6. A pawl drive mechanism for a lawn mower travel mechanism as defined in claim 4, wherein The second limiting mechanism includes a gland, the gland is a plate-shaped mechanism, and the center is equipped with recessed accommodation slot, and one end of output shaft is inserted into the accommodation slot, and the output shaft is connected with the gland through bolt fixing, and the bolt passes through the gland and output shaft in sequence.

7. A pawl drive mechanism for a lawn mower travel mechanism as defined in claim 5, wherein The flat pad and elastic pad are arranged between the bolt head and the surface of gland.

Images